2023 |
| Zong Y, Dai X, Canyelles-Pericas P, Gao Z, Ng WP, Busawon K and Binns R (2023), "Synchronisation of Packet Coupled Low-accuracy RC Oscillator Clocks for Wireless Networks", IEEE Transactions on Wireless Communications. , pp. [in press]. |
| Abstract: Time-sensitive wireless applications have strict requirements on real-time data transmission and control operation. Even though time synchronisation has been extensively studied for providing a common timing among distributed wireless nodes, there still exists a lack of research for low-accuracy and large-drifting clocks, such as internal Resistor-Capacitor (RC) oscillator clocks with around 4 × 105 parts per million (ppm), which are widely used in wearable sensor systems. This paper proposes a Proportional Packet-Coupled Oscillators (PPkCOs) protocol for synchronising poor-performing internal RC oscillator clocks with high disturbances in the single-cluster wireless network. The behaviour of such a drifting clock is described as a non-identical and time-varying model. To achieve time synchronisation on low-accuracy internal RC oscillator clocks, a packet-coupled synchronisation scheme is proposed for adjusting drifting clocks via the proportional control-based correction scheme. The RC oscillator frequency in an embedded system cannot be corrected, and this work utilises the clock threshold adjustment as a substitute for frequency correction. The stability region of controller parameters is given to guarantee that the clock threshold approaches a value, which is jointly determined by the nominal threshold and the corresponding clock frequency. We also propose a linear matrix inequality condition to prove that the P-PkCOs performance is robust against the large clock disturbances. We demonstrate the implementation of P-PkCOs. The experimental results show that P-PkCOs can achieve and maintain robust time synchronisation on the internal RC oscillator clocks. |
BibTeX:
@article{Zong2023,
author = {Zong, Yan and Dai, Xuewu and Canyelles-Pericas, Pep and Gao, Zhiwei and Ng, Wai Pang and Busawon, Krishna and Binns, Richard},
title = {Synchronisation of Packet Coupled Low-accuracy RC Oscillator Clocks for Wireless Networks},
journal = {IEEE Transactions on Wireless Communications},
year = {2023},
pages = {[in press]}
}
|
| Zong Y, Dai X, Wei Z, Zou M, Guo W and Gao Z (2022), "Robust Time Synchronisation for Industrial Internet of Things by H∞ Output Feedback Control", IEEE Internet of Things Journal., Feb, 2023. Vol. 10(3), pp.2021-2030. |
| Abstract: Precise timing over timestamped packet exchange communication is an enabling technology in the mission-critical industrial Internet of Things, particularly when satellite-based timing is unavailable. The main challenge is to ensure timing accuracy when the clock synchronisation system is subject to disturbances caused by the drifting frequency, time-varying delay, jitter, and timestamping uncertainty. In this work, a Robust Packet-Coupled Oscillators (R-PkCOs) protocol is proposed to reduce the effects of perturbations manifested in the drifting clock, timestamping uncertainty and delays. First, in the spanning tree clock topology, time synchronisation between an arbitrary pair of clocks is modelled as a state-space model, where clock states are coupled with each other by one-way timestamped packet exchange (referred to as packet coupling), and the impacts of both drifting frequency and delays are modelled as disturbances. A static output controller is adopted to adjust the drifting clock. The H∞ robust control design solution is proposed to guarantee that the ratio between the modulus of synchronisation precision and the magnitude of the disturbances is always less than a given value. Therefore, the proposed time synchronisation protocol is robust against the disturbances, which means that the impacts of drifting frequency and delays on the synchronisation accuracy are limited. The one-hour experimental results demonstrate that the proposed R-PkCOs protocol can realise time synchronisation with the precision of six microseconds in a 21-node IEEE 802.15.4 network. This work has widespread impacts in the process automation of automotive, mining, oil and gas industries. |
BibTeX:
@article{Zong2023a,
author = {Zong, Yan and Dai, Xuewu and Wei, Zhuangkun and Zou, Mengbang and Guo, Weisi and Gao, Zhiwei},
title = {Robust Time Synchronisation for Industrial Internet of Things by H∞ Output Feedback Control},
journal = {IEEE Internet of Things Journal},
year = {2023},
volume = {10},
issue = {3},
pages = {2021-2030},
doi = {10.1109/JIOT.2022.3144199}
}
|
2022 |
| Gao S, Liu J, Zong Y, Wang M, Jin X, Tian G and Dai X (2022), "Blast source TDOA localization with time synchronization estimation based on spatial overpressure-monitoring network", Measurement. Vol. 204, pp. 112080. |
| Abstract: To implement blast source localization precisely by the lowest number of sensor nodes, we propose a time delay of arrival (TDOA) localization method with time synchronization estimation algorithm based on spatial overpressure sensing system (SOSS) using low-power wide-area network (LPWAN) in this paper. The proposed SOSS consisting of an internal spatial wireless sub-array (ISWS) and external wireless planar sub-arrays (EWPS) is to combine the angle with distance to assess the blast source location by the least average error approximation algorithm. The ISWS is used to calculate the incoming angle of blast source towards the central point of the SOSS, while the EWPS calculates the distance from the central of the SOSS to the blast source. We have also proved that the time synchronization algorithm has an obvious impact on the blast range estimation error calculation. The results in the proposed method show that the localization distance and angle error of blast source is within 1 m and 1°in 2D coordinates, respectively. This paper is conducted to provide new insight into blast source localization algorithm and explore how time synchronization of WSN affects localization precision. Index Terms: Blast wave, Overpressure, Time synchronization, LPWAN, WSN. |
BibTeX:
@article{Gao2022,
author = {Gao, Shang and Liu, Jianhang and Zong, Yan and Wang, Mingyang and Jin, Xin and Tian, Guiyun and Dai, Xuewu},
title = {Blast source TDOA localization with time synchronization estimation based on spatial overpressure-monitoring network},
journal = {Measurement},
year = {2022},
volume = {204},
pages = {112080},
url = {https://www.sciencedirect.com/science/article/pii/S0263224122012763},
doi = {10.1016/j.measurement.2022.112080}
}
|
| Gao S, Zhang Z, Zong Y, Tian G, Dai X, Zhong Y and Jin X (2022), "A Wireless Transient Attenuated-Exponential Overpressure Beamforming With for Far-Field Blast Source Localization", IEEE Sensors Journal., dec, 2022. Vol. 22(23), pp. 23521-23528. |
| Abstract: Time-domain beamforming is more suitable for blast wave transient signal than frequency-domain beamformer because wideband spectrum of noise makes the beamforming image less clear. To avoid the gust effects and enable the location of blast source accurately, this article proposes a new 1-D far-field delay-and-sum (DAS) beamforming method with an attenuate exponential function model for wireless overpressure transient signal. In addition, we design wireless overpressure peak and root-mean-square (rms) directional estimators to assess the performance of the proposed new DAS beamforming method. Furthermore, the effects of the wireless pressure sensor node (WPSN) spacing, the number of WPSNs, and sidelobe level brought from noise on the beamwidth are investigated in the two estimators. The proposed formula is verified by a uniformly spaced linear sensing array, and the results verify the feasibility of the proposed method in blast source localization. This article is conducted to provide new insight into blast source localization algorithm and further open a door for transient blast overpressure source localization scenarios in future. |
BibTeX:
@article{Gao2022a,
author = {Gao, Shang and Zhang, Zirui and Zong, Yan and Tian, Guiyun and Dai, Xuewu and Zhong, Yongteng and Jin, Xin},
title = {A Wireless Transient Attenuated-Exponential Overpressure Beamforming With for Far-Field Blast Source Localization},
journal = {IEEE Sensors Journal},
year = {2022},
volume = {22},
number = {23},
pages = {23521--23528},
doi = {10.1109/JSEN.2022.3187762}
}
|
| Liu F, Dai X, Jin M, Zhang W, Yang Y and Qin F (2022), "TACAN: The Shaping of Delay Distribution Under Multipath Fading Channel for Industrial IoT Systems", IEEE Internet of Things Journal., sep, 2022. Vol. 9(17), pp. 16714-16725. |
| Abstract: The wireless-enabled Industrial Internet of Things (IIoT) system is promising due to its flexibility and cable-free deployment. The varying fading channel will lead to the random transmission delays and jitters, which are the major challenges hindering the adoption of wireless communication in mission-critical industrial systems. The performance or even the stability of closed-loop feedback control system will degrade severely with such delays and jitters. As a result, the maximum delay margin should be met to guarantee the performance of the IIoT system. Aiming to better satisfy this requirement, a novel concept to shape the delay distribution under the industrial multipath fading channel is proposed in this article. Consequently, a two-layer closed feedback control algorithm, referred as TACAN in this article, is designed through the decoupling of original optimization function, by which the variance of the delay distribution is minimized to improve the reliability and stability of the IIoT systems. The performance of proposed delay shape control method is verified by both the classical Rician channel model and the field measured industrial fading channel responses. |
BibTeX:
@article{Liu2022,
author = {Liu, Fangfang and Dai, Xuewu and Jin, Mengran and Zhang, Wuxiong and Yang, Yang and Qin, Fei},
title = {TACAN: The Shaping of Delay Distribution Under Multipath Fading Channel for Industrial IoT Systems},
journal = {IEEE Internet of Things Journal},
year = {2022},
volume = {9},
number = {17},
pages = {16714--16725},
doi = {10.1109/JIOT.2022.3153515}
}
|
| Lu G, Dai X, Zhang W, Yang Y and Qin F (2022), "Nondata-Aided Rician Parameters Estimation With Redundant GMM for Adaptive Modulation in Industrial Fading Channel", IEEE Transactions on Industrial Informatics., apr, 2022. Vol. 18(4), pp. 2603-2613. |
| Abstract: Wireless networks have been widely utilized in industries, where wireless links are challenged by the severe nonstationary Rician fading channel, which requires online link quality estimation to support high-quality wireless services. However, most traditional Rician estimation approaches are designed for channel measurements and work only with nonmodulated symbols. Then, the online Rician estimation usually requires a priori aiding pilots or known modulation order to cancel the modulation interference. This article proposes a nondata-aided method with redundant Gaussian mixture model (GMM). The convergence paradigm of GMM with redundant subcomponents has been analyzed, guided by which the redundant subcomponents can be iteratively discriminated to approach the global optimization. By further adopting the constellation constraint, the probability to identify the redundant subcomponent is significantly increased. As a result, accurate estimation of the Rician parameters can be achieved without additional overhead. Experiments illustrate not only the feasibility but also the near-optimal accuracy. |
BibTeX:
@article{Lu2022,
author = {Lu, Guobao and Dai, Xuewu and Zhang, Wuxiong and Yang, Yang and Qin, Fei},
title = {Nondata-Aided Rician Parameters Estimation With Redundant GMM for Adaptive Modulation in Industrial Fading Channel},
journal = {IEEE Transactions on Industrial Informatics},
year = {2022},
volume = {18},
number = {4},
pages = {2603--2613},
doi = {10.1109/TII.2021.3095253}
}
|
| Vernon J, Canyelles-Pericas P, Torun H, Dai X, Ng WP, Binns R, Busawon K and Fu Y-Q (2022), "Acousto-Pi: An Opto-Acoustofluidic System Using Surface Acoustic Waves Controlled With Open-Source Electronics for Integrated In-Field Diagnostics", IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control., jan, 2022. Vol. 69(1), pp. 411-422. |
| Abstract: Surface acoustic wave (SAW) devices are increasingly applied in life sciences, biology, and point-of-care applications due to their combined acoustofluidic sensing and actuating properties. Despite the advances in this field, there remain significant gaps in interfacing hardware and control strategies to facilitate system integration with high performance and low cost. In this work, we present a versatile and digitally controlled acoustofluidic platform by demonstrating key functions for biological assays such as droplet transportation and mixing using a closed-loop feedback control with image recognition. Moreover, we integrate optical detection by demonstrating in situ fluorescence sensing capabilities with a standard camera and digital filters, bypassing the need for expensive and complex optical setups. The Acousto-Pi setup is based on open-source Raspberry Pi hardware and 3-D printed housing, and the SAW devices are fabricated with piezoelectric thin films on a metallic substrate. The platform enables the control of droplet position and speed for sample processing (mixing and dilution of samples), as well as the control of temperature based on acousto-heating, offering embedded processing capability. It can be operated remotely while recording the measurements in cloud databases toward integrated in-field diagnostic applications such as disease outbreak control, mass healthcare screening, and food safety. |
BibTeX:
@article{Vernon2022,
author = {Vernon, Jethro and Canyelles-Pericas, Pep and Torun, Hamdi and Dai, Xuewu and Ng, Wai Pang and Binns, Richard and Busawon, Krishna and Fu, Yong-Qing},
title = {Acousto-Pi: An Opto-Acoustofluidic System Using Surface Acoustic Waves Controlled With Open-Source Electronics for Integrated In-Field Diagnostics},
journal = {IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control},
year = {2022},
volume = {69},
number = {1},
pages = {411--422},
doi = {10.1109/TUFFC.2021.3113173}
}
|
| Zhang Q, Wang Y, Li D, Xie J, Tao R, Luo J, Dai X, Torun H, Wu Q, Ng WP and Others (2022), "Flexible multifunctional platform based on piezoelectric acoustics for human–machine interaction and environmental perception", Microsystems & Nanoengineering. Vol. 8(1), pp. 1-13. Nature Publishing Group.
[BibTeX] |
BibTeX:
@article{Zhang2022,
author = {Zhang, Qian and Wang, Yong and Li, Dongsheng and Xie, Jin and Tao, Ran and Luo, Jingting and Dai, Xuewu and Torun, Hamdi and Wu, Qiang and Ng, Wai Pang and Others},
title = {Flexible multifunctional platform based on piezoelectric acoustics for human–machine interaction and environmental perception},
journal = {Microsystems & Nanoengineering},
publisher = {Nature Publishing Group},
year = {2022},
volume = {8},
number = {1},
pages = {1--13}
}
|
| Zhang Z, Dai X, Shan G, Li G, Li X, Liu X and Qin F (2022), "A low cost UV-IR dual wavelength optical sensor with Chirp modulation for in-situ chemical oxygen demand measurements", Sensors and Actuators B: Chemical. Vol. 371, pp. 132538. Elsevier. |
BibTeX:
@article{Zhang2022a,
author = {Zhang, Zhimin and Dai, Xuewu and Shan, Guangcun and Li, Gang and Li, Xujie and Liu, Xiaobo and Qin, Fei},
title = {A low cost UV-IR dual wavelength optical sensor with Chirp modulation for in-situ chemical oxygen demand measurements},
journal = {Sensors and Actuators B: Chemical},
publisher = {Elsevier},
year = {2022},
volume = {371},
pages = {132538}
}
|
| Zong Y, Liu S, Liu X, Gao S, Dai X and Gao Z (2022), "Robust Synchronized Data Acquisition for Biometric Authentication", IEEE Transactions on Industrial Informatics., dec, 2022. Vol. 18(12), pp. 9072-9082. |
| Abstract: Owing to its unique, concealment and easy customization by combining different wrist and hand gestures, high-density surface electromyogram (HD-sEMG) is recognized as a potential solution to the next generation biometric authentication, which usually adopts a wireless body sensor network (BSN) to acquire the multi-channel HD-sEMG biosignals from distributed electrode arrays. For more accurate and reliable classification, biometric authentication requires the distributed biosignals to be sampled simultaneously and be well aligned, which means that the sampling jitters among the arrays need to be tiny. To synchronize data sampling clocks of a cluster of BSN nodes for biometric authentication, this article modifies the packet-coupled oscillators protocol by using a dynamic controller (D-PkCOs). This protocol only involves one-way single packet exchange, which reduces the communication overhead significantly. For the purpose of maintaining precise sampling of these BSN nodes subject to drifting clock frequency and varying delays, the dynamic controller is designed via the H_ robust method, and it is proved that all the BSN nodes' sampling jitters are bounded. The experimental results demonstrate that the D-PkCOs protocol can keep the sampling jitters less than a microsecond in a 10-node IEEE 802.15.4 network. The application of D-PkCOs to the BSN shows that the HD-sEMG signal with a high signal-to-noise ratio is obtained, which leads to better gesture classification performance. |
BibTeX:
@article{Zong2022,
author = {Zong, Yan and Liu, Shuxin and Liu, Xiaoxu and Gao, Shang and Dai, Xuewu and Gao, Zhiwei},
title = {Robust Synchronized Data Acquisition for Biometric Authentication},
journal = {IEEE Transactions on Industrial Informatics},
year = {2022},
volume = {18},
number = {12},
pages = {9072--9082},
doi = {10.1109/TII.2022.3182326}
}
|
| Dai X, Li H, Olanrewaju I, Kotter R, Putrus G, Aslam N, Bentley E, Wang Y, Marzband M, Das R, van der Hoogt J and Portvik S (2022), "Data-Driven EV Charging Load Forecasting and Smart Charging", In Transport Research Arena (TRA) Conference 2022. Lisbon,Portugal , pp. 1-8. Elsevier. |
| Abstract: Electrical Vehicles (EVs) have been proposed as a solution for decarbonizing road transport. Smart charging is essential to coordinate EV energy demand with the requisite peak power supply. The performance of smart charging highly depends on understanding the EVs' charging behaviour (charging patterns and energy demands), and an accurate forecasting of the EV energy demands are essential for designing a smart charging scheme. This paper presents findings from analysing 3 years' data of an Oslo Vulkan parking garage pilot, one of the largest hybrid public/commercial/residential parking garages for EV charging in Norway/Europe. A long-short-term-memory (LSTM) regression network is developed to predict hourly EV charging demand with a Weighted Absolute Percentage Error of 30.5%. The analysis suggests that a smart charging strategy is needed to shave the peak demand during 19:00-21:00. |
BibTeX:
@inproceedings{Dai2022,
author = {Dai, Xuewu and Li, Handong and Olanrewaju, Israel and Kotter, Richard and Putrus, Ghanim and Aslam, Nauman and Bentley, Edward and Wang, Yue and Marzband, Mousa and Das, Ridoy and van der Hoogt, Jorden and Portvik, Sture},
title = {Data-Driven EV Charging Load Forecasting and Smart Charging},
booktitle = {Transport Research Arena (TRA) Conference 2022},
publisher = {Elsevier},
year = {2022},
pages = {1--8},
url = {https://traconference.eu/}
}
|
| Joy J, Zhang M, Dai X, Fu R, Ghassemloosy Z and Wu Q (2022), "Fibre Optics Biosensors for the Detection of Bacteria - a review", In 2022 13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)., jul, 2022. , pp. 667-670. |
| Abstract: Optical fiber Biosensing for bacteria detection is an emerging technology in the past two decades, which has advantages of high sensitivity, small size, and capability for real time monitoring. In this paper, different types of optical fiber bacteria biosensors were classified and summarized. |
BibTeX:
@inproceedings{Joy2022,
author = {Joy, Jomin and Zhang, Meng and Dai, Xuewu and Fu, Richard and Ghassemloosy, Zabih and Wu, Qiang},
title = {Fibre Optics Biosensors for the Detection of Bacteria - a review},
booktitle = {2022 13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)},
year = {2022},
pages = {667--670},
doi = {10.1109/CSNDSP54353.2022.9907897}
}
|
| Lan Z, Dai J, Hu X, Dai X, Xing M and Chen L (2022), "Wind power ramp detection algorithms based on slope point correction", In 2022 27th International Conference on Automation and Computing (ICAC)., sep, 2022. , pp. 1-6. |
| Abstract: Wind power ramp event refers to the large fluctuation of wind power in a short time interval, which will seriously affect the safe and stable operation of power grid system. In order to maintain the stable operation of power grid system, wind power ramp detection is extremely necessary. Therefore, how to improve the accuracy of wind power ramp detection is a problem worthy of study. In the existing wind power ramp detection algorithms, the accuracy of the ramp endpoint is not considered. Aiming at the problem of end-point accuracy in climbing section, this work proposes a wind power climbing detection algorithm RPCRD (ramp point correct climbing detection) based on ramp point correction, which considers the detection accuracy of wind power climbing point for the first time. In this algorithm, a merging method of climbing sections is proposed to solve the fracture problem, and a scoring mechanism for selecting climbing points is proposed to find the two extreme points that most conform to the climbing characteristics, and the climbing points at both ends of the climbing section of wind power are modified. |
BibTeX:
@inproceedings{Lan2022,
author = {Lan, Zhenyu and Dai, Jun and Hu, Xiang and Dai, Xuewu and Xing, Minghai and Chen, Liangyin},
title = {Wind power ramp detection algorithms based on slope point correction},
booktitle = {2022 27th International Conference on Automation and Computing (ICAC)},
year = {2022},
pages = {1--6},
doi = {10.1109/ICAC55051.2022.9911117}
}
|
| Li HL, Dai X, Kotter R, Aslam N, McLoughlin A and Yu J (2022), "EFORES: Electric Fleets with On-site Renewable Energy Sources", In North East Battery Alliance. |
BibTeX:
@inproceedings{Li2022,
author = {Li, Handong Li and Dai, Xuewu and Kotter, Richard and Aslam, Nauman and McLoughlin, Adrian and Yu, James},
title = {EFORES: Electric Fleets with On-site Renewable Energy Sources},
booktitle = {North East Battery Alliance},
year = {2022}
}
|
| Li H, Dai X, Kotter R, Aslam N and Cao Y (2022), "A Simulation Environment of Solar-Wind Powered Electric Vehicle Car Park for Reinforcement Learning and Optimization", In The 3rd International Symposium on New Energy and Electrical Technology ISNEET2022. Anyang Lecture Notes in Electrical Engineering; Springer. |
| Abstract: The transportation sector is the second greatest contributor to carbon emissions in the UK and Newcastle upon Tyne, accounting for around 33 % of total emissions in 2020. In accordance with the United Kingdom's goal to reach net zero by 2050 (and the city of Newcastle upon Tyne's ambition to do so by 2030), electric vehicles (EVs) play a crucial role in achieving net zero road transportation. However, if the electricity used to charge EVs is derived from fossil fuels, this does not necessarily imply a reduction of overall emissions nationally or globally. To achieve optimal EV charging, a deeper comprehension of the unpredictability of (on-site renewable energy sources) ORES energy output is required. In this paper, the predicted renewable energy generated is used as the actual value for the reinforcement learning algorithm simulation environment. Such a model is able to represent the relationship between the power generation and the wind speed as well as solar irradiation, which are characterized by significant uncertainties due to weather changes in both the short-time (hourly) and long-term (seasonally). The uncertainty analysis shows that the uncertainties in wind speed at Newcastle upon Tyne can be modelled as a Weibull distribution with parameters A = 19.98 and B = 1.91. As for energy demand, this paper integrates information from an Oslo (Norway) car parking garage based set of EV charging stations with EVs' demand statistics. The charging habits of EV users range from 800 minutes to 1,000 minutes of parking time, and from 5 kWh to 20 kWh in terms of charging energy. The maximum connection frequency for EV charging is 20 minutes. In addition, this paper develops methods for stochastic EV charging and parking space occupancy employing actual data. On the basis of the aforesaid renewable energy generation and the EV charging status, it is possible to develop a decision algorithm to optimal renewable energy efficiency. |
BibTeX:
@inproceedings{Li2022,
author = {Li, Handong and Dai, Xuewu and Kotter, Richard and Aslam, Nauman and Cao, Yue},
title = {A Simulation Environment of Solar-Wind Powered Electric Vehicle Car Park for Reinforcement Learning and Optimization},
booktitle = {The 3rd International Symposium on New Energy and Electrical Technology ISNEET2022},
publisher = {Lecture Notes in Electrical Engineering; Springer},
year = {2022},
url = {https://nrl.northumbria.ac.uk/id/eprint/50919/}
}
|
| Li H, Dai X, Kotter R, Aslam N, Mcloughlin A and Yu J (2022), "Modelling and Uncertainty Analysis of On-site Renewable Sources for Optimal EV Charging", In International conference on CApacity building in the Renewable Energy Sector (I-CARES'2022). Newcastle upon Tyne , pp. 1-6. |
| Abstract: Road transport is the second largest dimension of carbon emission, both nationally in the UK and locally in Newcastle upon Tyne, contributing about 33% of total emission in 2020. In line with the UK's target to reach net zero by 2050 (and the city of Newcastle upon Tyne's ambition to do so by 2030), electric vehicles (EVs) play a critical role in meeting net zero road transportation though it does not automatically imply a reduction of overall emission nationally or globally if the electricity to charge EVs is sourced from the fossil fuels. To achieve optimal EV charging, a better understanding of the uncertainties of ORES power generation is necessary. ANN (Artificial Neural Network) and time series forecasting methods are used in this paper to model wind and solar power generation and the power generation of ORES. Such a model is able to represent the relationship between the power generation and the wind speed as well as solar irradiation, which is of significant uncertainties due to weather changes in both short-time (hourly) and long-term (seasonally). The proposed method uses historical solar irradiance and wind speed data, together with numerical weather prediction (NWP) data. The proposed neural network is verified with the historic data at Newcastle upon Tyne for the years 2020 to 2022. The proposed methods have a root mean square error (RSME) of 2.26 (m/s) in wind speed modelling, and the RSME of solar irradiance is 50.79 (W/m 2). The uncertainties analysis shows that the uncertainties in wind speed at Newcastle upon Tyne can be modelled as a Weibull distribution with parameters A = 19.98 and B = 1.91. |
BibTeX:
@inproceedings{Li2022a,
author = {Li, Handong and Dai, Xuewu and Kotter, Richard and Aslam, Nauman and Mcloughlin, Adrian and Yu, James},
title = {Modelling and Uncertainty Analysis of On-site Renewable Sources for Optimal EV Charging},
booktitle = {International conference on CApacity building in the Renewable Energy Sector (I-CARES'2022)},
year = {2022},
pages = {1--6},
url = {https://www.researchgate.net/publication/362416958_Modelling_and_Uncertainty_Analysis_of_On-site_Renewable_Sources_for_Optimal_EV_Charging}
}
|
2021 |
| Gao S, Tian G, Dai X, Zhang Q, Wang Z, Yang X, Wang Q and Jia N (2021), "A Lightweight Wireless Overpressure Node Based Efficient Monitoring for Shock Waves", IEEE/ASME Transactions on Mechatronics. Vol. 26(1), pp. 448-457. |
| Abstract: Overpressure measurement is an important approach to evaluate the power of shock wave (SW) monitoring. Traditional wired monitoring systems exhibit the limitations of high-cost, heavyweight, troublesome maintenance, and big-data transmission in SW monitoring. In this article, a new lightweight FPGA-based wireless overpressure node (LFWON) with the resistance to higherature and high-pressure environment for SW monitoring. The proposed LFWON is based on the Spartan-6 XC6SLX9-2TQG144C FPGA circuit, via a serial peripheral interface to the RF transceiver and data bus to the NAND flash chip for data management. To validate the LFWON, experimental tests in terms of dynamic parameters and network quality are performed in a real blast testing with 8-kg trinitrotoluene. This article is conducted to provide new insights into how the antishocking structure and sensing algorithm of wireless sensor node is designed in SW monitoring for acquiring overpressure accurately. The results show that the errors of Δ P(7 m-12m), td(>6 m), and I + (3m-24 m) from proposed LFWON are below 20% in comparison with wired system. In addition, the RSSI value of LFWON should be set above-70 dBm for stable communication quality. |
BibTeX:
@article{Gao2021,
author = {Gao, Shang and Tian, Guiyun and Dai, Xuewu and Zhang, Qing and Wang, Zhiling and Yang, Xinge and Wang, Qiaomu and Jia, Naishu},
title = {A Lightweight Wireless Overpressure Node Based Efficient Monitoring for Shock Waves},
journal = {IEEE/ASME Transactions on Mechatronics},
year = {2021},
volume = {26},
number = {1},
pages = {448--457},
doi = {10.1109/TMECH.2020.3025955}
}
|
| Wei J, Qin F, Li G, Li X, Liu X and Dai X (2021), "Chirp modulation enabled turbidity measurement for large scale monitoring of fresh water", Measurement. Vol. 184, pp. 109989. |
| Abstract: Monitoring water turbidity accurately at a large scale provides vital information to alert abnormal water pollution event. However, scientists and engineers have to make the tradeoff among accuracy, range, and cost of turbidity measurement solutions. Consequently, the state of the art solutions utilize high-end hardware configurations to maintain high accuracy at wide dynamic range, which are either too expensive or complex to be adopted in large-scale monitoring. A low cost turbidity sensor without compromising on accuracy and dynamic range raises a big challenge. This paper approaches this challenge with Chirp modulation and signal convolution in the statistical domain, which can provide more than 40 dB gain with traditional low-cost photodiode. The proposed solution can significantly increase the system performance scaled with hardware configurations. As a result, the implemented proof of concept system can provide as high as 2% measurement accuracy over a wide range of 0–1000 NTU with low-cost hardware configurations. |
BibTeX:
@article{Wei2021,
author = {Wei, Junxuan and Qin, Fei and Li, Gang and Li, Xujie and Liu, Xiaobo and Dai, Xuewu},
title = {Chirp modulation enabled turbidity measurement for large scale monitoring of fresh water},
journal = {Measurement},
year = {2021},
volume = {184},
pages = {109989},
url = {https://www.sciencedirect.com/science/article/pii/S0263224121009180},
doi = {10.1016/j.measurement.2021.109989}
}
|
| Zong Y, Dai X and Gao Z (2021), "Proportional-Integral Synchronization for Nonidentical Wireless Packet-Coupled Oscillators With Delays", IEEE Transactions on Industrial Electronics., nov, 2021. Vol. 68(11), pp. 11598-11608. |
| Abstract: Precise timing among wireless sensor nodes is a key enabling technology for time-sensitive industrial wireless sensor networks (WSNs). However, the accuracy of timing is degraded by manufacturing tolerance, aging of crystal oscillators, and communication delays. This article develops a framework of packet-coupled oscillators (PkCOs) to characterize the dynamics of communication and time synchronization of clocks in WSNs. The nonidentical clock is derived to describe the embedded clock's behavior accurately. A proportional-integral (PI) packet coupling scheme is proposed for synchronizing networked embedded clocks, while, scheduling wireless Sync packets to different slots for transmission. It also possesses the feature of automatically eliminating the effects of unknown processing delay, which further improves the synchronization performance. The rigorous theoretical analysis of PI-based PkCOs is presented via studying a closed-loop time synchronization system. The performance of PI-based PkCOs is evaluated on a hardware testbed of IEEE 802.15.4 WSN. The experimental results show that the precision of the proportional-integral PkCOs protocol is as high as 60 μs (i.e., 2 ticks) for 32.768 kHz crystal oscillator-based clocks. |
BibTeX:
@article{Zong2021,
author = {Zong, Yan and Dai, Xuewu and Gao, Zhiwei},
title = {Proportional-Integral Synchronization for Nonidentical Wireless Packet-Coupled Oscillators With Delays},
journal = {IEEE Transactions on Industrial Electronics},
year = {2021},
volume = {68},
number = {11},
pages = {11598--11608},
doi = {10.1109/TIE.2020.3036228}
}
|
| Kotter R, Dai X, Heidrich O and Chu S (2021), "Independent Review of the 2021 CDP submission based on SCATTER by Newcastle City Council". Thesis at: Northumbria University. , pp. 48. |
BibTeX:
@techreport{Kotter2021,
author = {Kotter, Richard and Dai, Xuewu and Heidrich, Oliver and Chu, Stephanie},
title = {Independent Review of the 2021 CDP submission based on SCATTER by Newcastle City Council},
school = {Northumbria University},
year = {2021},
pages = {48},
url = {https://researchportal.northumbria.ac.uk/en/publications/ independent-review-of-the-2021-cdp-submission-based-on-scatter-by}
}
|
2020 |
| Gao S, Tian G, Dai X, Jiang X, Kong D, Zong Y and Yi Q (2020), "A B-Spline Method with AIS Optimization for 2-D IoT-Based Overpressure Reconstruction", IEEE Internet of Things Journal., mar, 2020. Vol. 7(3), pp. 2005-2013. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: In blast wave monitoring, a traditional travel time tomography method is encountered with local minimum travel time and low coverage density of rays. In this article, a novel B-spline fitting method with the knot-optimization artificial immune system (AIS) is proposed for 2-D overpressure reconstruction. It possesses the advantages of handling point sets of large sizes and adjusts the knot vector flexibly. Based on the overpressure value in the explosion from the travel time tomography method, the proposed method combining the advantages of B-splines and knot point optimization AIS is able to achieve the optimal sensor distribution and raise the reconstruction precision. The detailed experimental results about the comparison of linear fitting interpolation, cubic fitting interpolation, natural neighbor fitting interpolation, v4 fitting interpolation, Delaunay triangulation fitting, and B-spline method are also given. Furthermore, for the knot optimization issue in B-spline, the proposed adaptive fitting method with knot-optimization AIS has a smaller root-mean-square (RMS) error with eight knot nodes in comparison with the classic B-spline fitting method. This article is conducted to provide new insights to reconstructing 2-D Internet-of-Things-based (IoT-based) overpressure in blast wave monitoring more precisely under limited sensor deployment and further give a new approach to overpressure reconstruction scenarios. |
BibTeX:
@article{Gao2020,
author = {Gao, Shang and Tian, Guiyun and Dai, Xuewu and Jiang, Xuefeng and Kong, Deren and Zong, Yan and Yi, Qiuji},
title = {A B-Spline Method with AIS Optimization for 2-D IoT-Based Overpressure Reconstruction},
journal = {IEEE Internet of Things Journal},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2020},
volume = {7},
number = {3},
pages = {2005--2013},
doi = {10.1109/JIOT.2019.2960827}
}
|
| Ng WP, Lalam N, Dai X, Wu Q, Fu YQ, Harrington P, Gomes NJ and Lu C (2020), "Integrating Radio-Over-Fiber Communication System and BOTDR Sensor System", Sensors., apr, 2020. Vol. 20(8), pp. 2232. MDPI AG. |
| Abstract: In this paper, we propose and experimentally demonstrate for the first time, the integration of a radio-over-fiber (RoF) communication system and a Brillouin optical time-domain reflectometry (BOTDR) distributed sensor system using a single optical fiber link. In this proof-of-concept integrated system, the communication system is composed of three modulation formats of quadrature phase-shift keying (QPSK), 16-quadrature amplitude modulation (16-QAM) and 64-QAM, which are modulated onto an orthogonal frequency division multiplexing (OFDM) signal. Whereas, the BOTDR sensor system is used for strain and/or temperature monitoring over the fiber distance with a spatial resolution of 5 m using a 25 km single-mode silica fiber. The error vector magnitude (EVM) is analyzed in three modulation formats in the presence of various BOTDR input pump powers. Using QPSK modulation, optimized 18 dBm sensing and 10 dBm data power, the measured EVM values with and without bandpass filter are 3.5% and 14.5%, respectively. The proposed system demonstrates a low temperature measurement error (±0.49 °C at the end of 25 km) and acceptable EVM values, which were within the 3GPP requirements. The proposed integrated system can be effectively applied for practical applications, which significantly reduces the fiber infrastructure cost by effective usage of a single optical fiber link. |
BibTeX:
@article{Ng2020,
author = {Ng, Wai Pang and Lalam, Nageswara and Dai, Xuewu and Wu, Qiang and Fu, Yong Qing and Harrington, Peter and Gomes, Nathan J. and Lu, Chao},
title = {Integrating Radio-Over-Fiber Communication System and BOTDR Sensor System},
journal = {Sensors},
publisher = {MDPI AG},
year = {2020},
volume = {20},
number = {8},
pages = {2232},
url = {https://www.mdpi.com/1424-8220/20/8/2232},
doi = {10.3390/s20082232}
}
|
| Tang X, Zhang Q, Dai X and Zou Y (2020), "Neural Membrane Mutual Coupling Characterisation Using Entropy-Based Iterative Learning Identification", IEEE Access., dec, 2020. Vol. 8, pp. 205231-205243. |
| Abstract: This paper investigates the interaction phenomena of the coupled axons while the mutual coupling factor is presented as a pairwise description. Based on the Hodgkin-Huxley model and the coupling factor matrix, the membrane potentials of the coupled myelinated/unmyelinated axons are quantified which implies that the neural coupling can be characterised by the presented coupling factor. Meanwhile the equivalent electric circuit is supplied to illustrate the physical meaning of this extended model. In order to estimate the coupling factor, a data-based iterative learning identification algorithm is presented where the Rényi entropy of the estimation error has been minimised. The convergence of the presented algorithm is analysed and the learning rate is designed. To verified the presented model and the algorithm, the numerical simulation results indicate the correctness and the effectiveness. Furthermore, the statistical description of the neural coupling, the approximation using ordinary differential equation, the measurement and the conduction of the nerve signals are discussed respectively as advanced topics. The novelties can be summarised as follows: 1) the Hodgkin-Huxley model has been extended considering the mutual interaction between the neural axon membranes, 2) the iterative learning approach has been developed for factor identification using entropy criterion, and 3) the theoretical framework has been established for this class of system identification problems with convergence analysis. |
BibTeX:
@article{Tang2020,
author = {Tang, Xiafei and Zhang, Qichun and Dai, Xuewu and Zou, Yiqun},
title = {Neural Membrane Mutual Coupling Characterisation Using Entropy-Based Iterative Learning Identification},
journal = {IEEE Access},
year = {2020},
volume = {8},
pages = {205231--205243},
doi = {10.1109/ACCESS.2020.3037816}
}
|
| Tsapparellas G, Jin N, Dai X and Fehringer G (2020), "Laplacian Scores-Based Feature Reduction in IoT Systems for Agricultural Monitoring and Decision-Making Support", Sensors., sep, 2020. Vol. 20(18), pp. 5107. MDPI AG. |
| Abstract: Internet of things (IoT) systems generate a large volume of data all the time. How to choose and transfer which data are essential for decision-making is a challenge. This is especially important for low-cost and low-power designs, for example Long-Range Wide-Area Network (LoRaWan)-based IoT systems, where data volume and frequency are constrained by the protocols. This paper presents an unsupervised learning approach using Laplacian scores to discover which types of sensors can be reduced, without compromising the decision-making. Here, a type of sensor is a feature. An IoT system is designed and implemented for a plant-monitoring scenario. We have collected data and carried out the Laplacian scores. The analytical results help choose the most important feature. A comparative study has shown that using fewer types of sensors, the accuracy of decision-making remains at a satisfactory level. |
BibTeX:
@article{Tsapparellas2020,
author = {Tsapparellas, Giorgos and Jin, Nanlin and Dai, Xuewu and Fehringer, Gerhard},
title = {Laplacian Scores-Based Feature Reduction in IoT Systems for Agricultural Monitoring and Decision-Making Support},
journal = {Sensors},
publisher = {MDPI AG},
year = {2020},
volume = {20},
number = {18},
pages = {5107},
url = {https://www.mdpi.com/1424-8220/20/18/5107},
doi = {10.3390/s20185107}
}
|
| Aggarwal G, Dai X, Saatchi R and Binns R (2020), "BER performance comparison of EEG healthcare system using 8-pixel, 16-pixel OLED screen, and DSLR camera", In Smart Biosensors in Medical Care., jan, 2020. , pp. 107-123. Elsevier. |
BibTeX:
@inproceedings{Aggarwal2020,
author = {Aggarwal, Geetika and Dai, Xuewu and Saatchi, Reza and Binns, Richard},
title = {BER performance comparison of EEG healthcare system using 8-pixel, 16-pixel OLED screen, and DSLR camera},
booktitle = {Smart Biosensors in Medical Care},
publisher = {Elsevier},
year = {2020},
pages = {107--123},
doi = {10.1016/b978-0-12-820781-9.00006-1}
}
|
| Zong Y, Dai X, Canyelles-Pericas P, Busawon K, Binns R and Gao Z (2020), "Modelling and Synchronisation of Delayed Packet-Coupled Oscillators in Industrial Wireless Sensor Networks", In 21st IFAC World Congress 2020. Vol. 53(2), pp. 8283-8289. IFAC. |
| Abstract: In this paper, a Packet-Coupled Oscillators (PkCOs) synchronisation protocol is proposed for time-sensitive Wireless Sensor Networks (WSNs) based on Pulse-Coupled Oscillators (PCO) in mathematical biology. The effects of delays on synchronisation performance are studied through mathematical modelling and analysis of packet exchange and processing delays. The delay compensation strategy (i.e., feedforward control) is utilised to cancel delays effectively. A simple scheduling function is provided with PkCOs to allocate the packet transmission event to a specified time slot, by configuring reference input of the system to a non-zero value, in order to minimise the possibility of packet collision in synchronised wireless networks. The rigorous theoretical proofs are provided to validate the convergence and stability of the proposed synchronisation scheme. Finally, the simulations and experiments examine the effectiveness of PkCOs with delay compensation and scheduling strategies. The experimental results also show that the proposed PkCOs algorithm can achieve synchronisation with the precision of 26.3µs (1 tick). |
BibTeX:
@inproceedings{Zong2020,
author = {Zong, Yan and Dai, Xuewu and Canyelles-Pericas, Pep and Busawon, Krishna and Binns, Richard and Gao, Zhiwei},
title = {Modelling and Synchronisation of Delayed Packet-Coupled Oscillators in Industrial Wireless Sensor Networks},
booktitle = {21st IFAC World Congress 2020},
publisher = {IFAC},
year = {2020},
volume = {53},
number = {2},
pages = {8283--8289},
url = {https://www.sciencedirect.com/science/article/pii/S2405896320325817},
doi = {10.1016/j.ifacol.2020.12.1953}
}
|
| Dai X, Kotter R, Putrus G, Wang Y, Das R and Bentley Edward E (2020), "SEEV4-City Project Final report–Oslo Operational Pilot at Vulkan Car Park, Oslo, Norway", In SEEV4City.. Thesis at: Northumbria University. , pp. 75. |
BibTeX:
@techreport{Dai2020,
author = {Dai, Xuewu and Kotter, Richard and Putrus, Ghanim and Wang, Yue and Das, Ridoy and Bentley Edward, Etc.},
title = {SEEV4-City Project Final report–Oslo Operational Pilot at Vulkan Car Park, Oslo, Norway},
booktitle = {SEEV4City},
school = {Northumbria University},
year = {2020},
pages = {75},
url = {https://www.seev4-city.eu}
}
|
| Kotter R, Putrus G, Wang Y, Das R, Bentley E, O'Brien G, Dai X and Marzband M (2020), "Business Models for SEEV4-City Operational Pilots: From a generic SEEV4-City business model towards improved specific OP business models" SEEV4-City. |
BibTeX:
@techreport{Kotter2020,
author = {Kotter, Richard and Putrus, Ghanim and Wang, Yue and Das, Ridoy and Bentley, Edward and O'Brien, Geoffrey and Dai, Xuewu and Marzband, Mousa},
title = {Business Models for SEEV4-City Operational Pilots: From a generic SEEV4-City business model towards improved specific OP business models},
publisher = {SEEV4-City},
year = {2020}
}
|
| Putrus G, Kotter R, Wang Y, Das R, Bentley E, Dai X and Others (2020), "SEEV4-City Project Final report–Loughborough Operational Pilot, UK". Thesis at: Northumbria University. |
BibTeX:
@techreport{Putrus2020,
author = {Putrus, Ghanim and Kotter, Richard and Wang, Yue and Das, Ridoy and Bentley, Edward and Dai, Xuewu and Others},
title = {SEEV4-City Project Final report–Loughborough Operational Pilot, UK},
school = {Northumbria University},
year = {2020},
url = {https://www.seev4-city.eu}
}
|
2019 |
| Aggarwal G, Dai X, Saatchi R, Binns R and Sikandar A (2019), "Experimental Demonstration of Single-Channel EEG Signal Using 32 × 32 Pixel OLED Screen and Camera", Electronics., jun, 2019. Vol. 8(7), pp. 734. MDPI AG. |
| Abstract: Currently, the radiofrequency (RF)-based wireless technology deployed in electroencephalography (EEG) to diagnose brain diseases suffers from frequency spectrum and electromagnetic interference, and might also have adverse effects on the health of patients and equipment used in hospitals, especially in RF-restricted zones like intensive care units (ICUs). Optical wireless communication (OWC), specifically visible light communication (VLC), is featured in 5G network to complement the radiofrequency (RF) technologies due to the fact that huge unlicensed bandwidth and available infrastructure, both indoor and outdoor, reduces the implementation cost. The conventional VLC systems deploy photodiodes as receivers, requiring hardware and infrastructure modifications in addition to smaller field of view (FOV), but the use of cameras reduce the infrastructure cost due to inbuilt filters and a wider FOV coverage gives the ability to scale a larger area. The wider FOV and the movement of camera rotation, without any additional adjustments to maintain the line-of-sight (LOS), allows the patient to be anywhere within the room and FOV. This paper demonstrates a novel healthcare system for EEG using visible light optical camera communication (VL-OCC), where a 32 × 32 pixel OLED screen acts as transmitter and the receiver section consists of several different cameras such as digital single-lens reflex camera (DLSR), android smartphone, and Thorlabs camera. The experiments were performed in LOS deploying on-off keying (OOK) modulation at several distant measurements to determine the system reliability and stability through bit error rate (BER) performance. The proposed system results depict that the DSLR camera outperforms the smartphone and Thorlabs cameras, as it is capable of transmitting an error free bit rate of 2.8 kbps at 30 fps up to 5.5 m. |
BibTeX:
@article{Aggarwal2019b,
author = {Aggarwal, Geetika and Dai, Xuewu and Saatchi, Reza and Binns, Richard and Sikandar, Ajay},
title = {Experimental Demonstration of Single-Channel EEG Signal Using 32 × 32 Pixel OLED Screen and Camera},
journal = {Electronics},
publisher = {MDPI AG},
year = {2019},
volume = {8},
number = {7},
pages = {734},
url = {https://www.mdpi.com/2079-9292/8/7/734},
doi = {10.3390/electronics8070734}
}
|
| Gao S, Tian GY, Dai X, Fan M, Shi X, Zhu J and Li K (2019), "A Novel Distributed Linear-Spatial-Array Sensing System Based on Multichannel LPWAN for Large-Scale Blast Wave Monitoring", IEEE Internet of Things Journal., dec, 2019. Vol. 6(6), pp. 9679-9688. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: Traditional wired monitoring systems exhibit huge limitations in blast wave monitoring. To meet the requirements of long range, low cost, weight reduction, increased ease of installation maintenance, and big-data transmission in blast wave monitoring, a new distributed linear-spatial-array (D-LSA) sensing system based on low-power wide-area network (LPWAN) is proposed in this paper. This approach adopts a multichannel LoRa and NB-IoT air-blast gateway (M-CLNAG) and multiple FPGA-based wireless pressure LoRa nodes (FWPLNs) to construct a large-scale LPWAN for blast wave monitoring. The empirical models of dynamic parameter calculation (peak overpressure, duration of the positive phase and impulse) on the basis of D-LSA sensing system are redesigned for blast wave monitoring as well. Furthermore, we have evaluated the errors between the measured data from D-LSA sensing system and data from the redesigned empirical models. Finally, the wireless quality performance in terms of received signal strength indication (RSSI) and packet receive rate (PDR) for blast wave monitoring is also verified. This paper is conducted to provide new insights into how a sensing system integrating with LPWAN is designed in blast wave monitoring for acquiring dynamic parameters accurately and carrying out remote network communication efficiently, and further opening a door for wireless sensor network (WSN) in more blast wave monitoring scenarios. |
BibTeX:
@article{Gao2019,
author = {Gao, Shang and Tian, Gui Yun and Dai, Xuewu and Fan, Mengbao and Shi, Xingjuan and Zhu, Jinjie and Li, Kongjing},
title = {A Novel Distributed Linear-Spatial-Array Sensing System Based on Multichannel LPWAN for Large-Scale Blast Wave Monitoring},
journal = {IEEE Internet of Things Journal},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2019},
volume = {6},
number = {6},
pages = {9679--9688},
doi = {10.1109/JIOT.2019.2930472}
}
|
| Liao Y, Shen X, Sun G, Dai X and Wan S (2019), "EKF/UKF-based channel estimation for robust and reliable communications in V2V and IIoT", Eurasip Journal on Wireless Communications and Networking., dec, 2019. Vol. 2019(1), pp. 1-13. Springer International Publishing. |
| Abstract: Cyber-physical systems (CPSs) are characterized by integrating computation, communication, and physical system. In typical CPS application scenarios, vehicle-to-vehicle (V2V) and Industry Internet of Things (IIoT), due to doubly selective fading and non-stationary channel characteristics, the robust and reliable end-to-end communication is extremely important. Channel estimation is a major signal processing technology to ensure robust and reliable communication. However, the existing channel estimation methods for V2V and IIoT cannot effectively reduce intercarrier interference (ICI) and lower the computation complexity, thus leading to poor robustness. Aiming at this challenge, according to the channel characteristics of V2V and IIoT, we design two channel estimation methods based on the Bayesian filter to promote the robustness and reliability of end-to-end communication. For the channels with doubly selective fading and non-stationary characteristics of V2V and IIoT scenarios, in the one hand, basis extended model (BEM) is used to further reduce the complexity of the channel estimation algorithm under the premise that ICI can be eliminated in the channel estimation. On the other hand, aiming at the non-stationary channel, a channel estimation and interpolation method based on extended Kalman filter (EKF) and unscented Kalman filter (UKF) Bayesian filters to jointly estimate the channel impulse response (CIR) and time-varying time domain autocorrelation coefficient is adopted. Through the MATLAB simulation, the robustness and reliability of end-to-end communication for V2V and IIoT are promoted by the proposed algorithms. |
BibTeX:
@article{Liao2019a,
author = {Liao, Yong and Shen, Xuanfan and Sun, Guodong and Dai, Xuewu and Wan, Shaohua},
title = {EKF/UKF-based channel estimation for robust and reliable communications in V2V and IIoT},
journal = {Eurasip Journal on Wireless Communications and Networking},
publisher = {Springer International Publishing},
year = {2019},
volume = {2019},
number = {1},
pages = {1--13},
doi = {10.1186/s13638-019-1424-2}
}
|
| Shen X-F, Liao Y, DAI Xue-wu LIU and Dan WANG (2019), "Non-stationary and doubly-selective channel estimation method based on basis expansion model", ACTA ELECTONICA SINICA. Vol. 47(1), pp. 204.
[BibTeX] |
BibTeX:
@article{Shen2019a,
author = {Shen, Xuan-Fan and Liao, Yong and DAI Xue-wu, L I U and WANG, Dan},
title = {Non-stationary and doubly-selective channel estimation method based on basis expansion model},
journal = {ACTA ELECTONICA SINICA},
year = {2019},
volume = {47},
number = {1},
pages = {204}
}
|
| Zhang Q, Lu G, Zhang W, Shen F, Dai X, Jiao J and Qin F (2019), "Non-Data Aided Rician Parameters Estimation in Temporal Fading Channel with 3 DoFs Gaussian Mixture Model", IEEE Access. Vol. 7, pp. 62198-62209. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: Rician distribution has been widely utilized to describe wireless fading channel. In the non-stationary temporal fading channel like industrial scenarios, both the specular and scattered components of the multi-path fading channel will be time varying. As a result, the online estimation of Rician parameters is necessary to provide stable wireless service. The traditional estimation approaches of Rician parameters are designed for channel measurement usage and therefore have to work in the data-aided mode for online estimation with modulated I/Q samples. To solve this problem, some non-data-aided algorithms have been proposed in recent years, but only valid in specific scenarios. In this paper, we formulate the estimation of Rician parameters from modulated I/Q samples as a two-dimensional Gaussian mixture model to provide a general non-data-aided Rician parameter estimation method. By involving a priori information of modulation scheme and the motivation of optimized gradient searching, the independent parameters in the maximum likelihood estimation can be significantly decreased to three, which leads to fast convergence of the modified expectation-maximization algorithm with high accuracy. The combination of these modifications has been finally formulated as a Rician mixture model. The numerical results and field measurements illustrate the feasibility of this methodology. |
BibTeX:
@article{Zhang2019,
author = {Zhang, Qilong and Lu, Guobao and Zhang, Wuxiong and Shen, Fei and Dai, Xuewu and Jiao, Jianbin and Qin, Fei},
title = {Non-Data Aided Rician Parameters Estimation in Temporal Fading Channel with 3 DoFs Gaussian Mixture Model},
journal = {IEEE Access},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2019},
volume = {7},
pages = {62198--62209},
doi = {10.1109/ACCESS.2019.2903931}
}
|
| Zhang G, Shen F, Chen N, Zhu P, Dai X and Yang Y (2019), "DOTS: Delay-optimal task scheduling among voluntary nodes in fog networks", IEEE Internet of Things Journal., apr, 2019. Vol. 6(2), pp. 3533-3544. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: Through offloading the computing tasks of the task nodes (TNs) to the fog nodes (FNs) located at the network edge, the fog network is expected to address the unacceptable processing delay and heavy link burden existed in current cloud-based networks. Unlike most existing researches based on the command-mode offloading and full capability report, this paper develops a general analytical model of the task scheduling among voluntary nodes (VNs) in fog networks, wherein the VNs voluntarily contribute their capabilities for serving their neighboring TNs. A novel delay-optimal task scheduling (DOTS) algorithm is proposed to obtain the delay-optimal offloading solution according to the reported capabilities of the VNs. Extensive simulations are carried out in a fog network, and the numerical results indicate that the proposed DOTS algorithm can effectively provide the optimal set of the helper nodes, subtask sizes, and the TN transmission power to minimize the overall task processing delay. Moreover, compared with the command-mode offloading, the voluntary-mode achieves more balanced offloading and a higher fairness level among the FNs. |
BibTeX:
@article{Zhang2019a,
author = {Zhang, Guowei and Shen, Fei and Chen, Nanxi and Zhu, Pengcheng and Dai, Xuewu and Yang, Yang},
title = {DOTS: Delay-optimal task scheduling among voluntary nodes in fog networks},
journal = {IEEE Internet of Things Journal},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2019},
volume = {6},
number = {2},
pages = {3533--3544},
doi = {10.1109/JIOT.2018.2887264}
}
|
| Aggarwal G, Dai X, Binns R, Saatchi R, Busawon K and Bentley E (2019), "Wireless EEG signal transmission using visible light optical camera communication", In International Conference on Application of Computing and Communication Technologies (ICACCT2018)., mar, 2019. Vol. 899, pp. 152-161. Springer Verlag. |
| Abstract: Electroencephalogram (EEG) has been widely adopted for the brain monitoring. The transmission of the EEG signals captured from the scalp using electrodes to a displayed screen is often performed through wires utilizing Radio Frequency (RF) communication technology. The wired EEG transmission restricts the patient movement during the entire EEG recordings. However, patient movement is necessary during EEG recordings in certain medical scenario. Towards this end, wireless transmission of the EEG signals enables patient movements during the recordings. In this context, this paper proposes a Visible Light Optical Camera Communication (VL-OCC) system for wireless transmission of EEG signal. The signal transmission under the LOS, line of sight is conducted modulation scheme namely On-Off-Keying (OOK), Non-Return-to-Zero (NRZ). Specifically, organic light emitting diode, and optical camera are used as sender and receiver in the system, respectively. The performance of VL-OCC system is evaluated by developing an experimental prototype under realistic medical scenario. |
BibTeX:
@inproceedings{Aggarwal2019,
author = {Aggarwal, Geetika and Dai, Xuewu and Binns, Richard and Saatchi, Reza and Busawon, Krishna and Bentley, Edward},
title = {Wireless EEG signal transmission using visible light optical camera communication},
booktitle = {International Conference on Application of Computing and Communication Technologies (ICACCT2018)},
publisher = {Springer Verlag},
year = {2019},
volume = {899},
pages = {152--161},
url = {https://doi.org/10.1007/978-981-13-2035-4_14},
doi = {10.1007/978-981-13-2035-4_14}
}
|
| Aggarwal G, Dai X, Binns R and Saatchi R (2019), "Real-time Wireless Healthcare system for Angular Transmission of EEG signal using VL-OCC", Procedia Computer Science., jan, 2019. Vol. 152, pp. 28-35. Elsevier B.V.. |
| Abstract: Examining the brain activity has immense scope in diagnosing specific diseases such as epilepsy and comma. The electrical activity of the brain read from the scalp is known as Electroencephalography (EEG). The traditional EEG systems deploy RF protocols suffering from electromagnetic interference (EMI) which might have harmful effect on health of patient especially in RF restricted zones such as hospitals, hence VLC is preferred due to free from EMI, reliability and enhanced security. Also, the advancement in technology in smartphones and cameras have led to the use of camera or smartphone as receiver in VLC systems rather than using photodiode as receiver unlike traditional VLC systems. Hence, this paper proposes a new novel technique and the system reliability for angular transmission of biomedical EEG data VL-OCC system at data rate of 2kbpswith 30 fps camera frame rate deploying modulation namely, On-Off Keying Non- Return to Zero (OOK_NRZ). |
BibTeX:
@article{Aggarwal2019a,
author = {Aggarwal, Geetika and Dai, Xuewu and Binns, Richard and Saatchi, Reza},
title = {Real-time Wireless Healthcare system for Angular Transmission of EEG signal using VL-OCC},
journal = {Procedia Computer Science},
publisher = {Elsevier B.V.},
year = {2019},
volume = {152},
pages = {28--35},
url = {https://linkinghub.elsevier.com/retrieve/pii/S187705091930674X},
doi = {10.1016/j.procs.2019.05.023}
}
|
| Liao Y, Hua Y, Dai X, Yao H and Yang X (2019), "ChanEstNet: A Deep Learning Based Channel Estimation for High-Speed Scenarios", In IEEE International Conference on Communications., may, 2019. Vol. 2019-May Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: Aiming at the problem that the downlink channel estimation performance is limited due to the fast time-varying and non-stationary characteristics in the high-speed mobile scenarios, we propose a channel estimation network based on deep learning, called ChanEstNet. ChanEstNet uses the convolutional neural network (CNN) to extract channel response feature vectors and recurrent neural network (RNN) for channel estimation. We use a large amount of high-speed channel data to conduct offline training for the learning network, fully exploit the channel information in the training sample, make it learn the characteristics of fast time-varying and non-stationary channels, and better track the features of channels changing in high-speed environments. The simulation results show that in the high-speed mobile scenarios, compared with the traditional methods, the proposed channel estimation method has low computational complexity and significant performance improvement. |
BibTeX:
@inproceedings{Liao2019,
author = {Liao, Yong and Hua, Yuanxiao and Dai, Xuewu and Yao, Haimei and Yang, Xinyi},
title = {ChanEstNet: A Deep Learning Based Channel Estimation for High-Speed Scenarios},
booktitle = {IEEE International Conference on Communications},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2019},
volume = {2019-May},
doi = {10.1109/ICC.2019.8761312}
}
|
| Liu Y, Zhang W, Yang Y, Fang W, Qin F and Dai X (2019), "PAMT: Phase-based Acoustic Motion Tracking in Multipath Fading Environments", In IEEE INFOCOM 2019 - IEEE Conference on Computer Communications., apr, 2019. , pp. 2386-2394. |
| Abstract: Motion tracking technologies have been widely used in mobile interaction applications, such as Virtual Reality (VR), healthy monitoring, and virtual touch control. Compared with dedicated hardware devices, mobile phones use reliable speakers and microphones, and can serve as ubiquitous devices for cheap acoustic-based motion tracking solutions. However, for complex indoor environments, it is very difficult for acoustic-based methods to achieve accurate motion tracking due to multipath fading and limited sampling rate at mobile devices. In this paper, a new parameter named Multipath Effect Ratio (MER) is defined to indicate the multipath fading effect on received signals at different frequencies. Based on MER, a novel multipath effect mitigating technique is developed to calculate the phase change of acoustic signals and track the corresponding moving distance by using multiple speakers. A Phase-based Acoustic Motion Tracking (PAMT) method is then proposed and implemented on standard Android smartphones. Experiment results show, without any specialized hardware, PAMT can achieve an impressive millimeter-level accuracy for localization and motion tracking applications in multipath fading environments. Specifically, the measurement errors are less than 2mm and 4mm in one-dimensional and two-dimensional scenarios, respectively. |
BibTeX:
@inproceedings{Liu2019,
author = {Liu, Yang and Zhang, Wuxiong and Yang, Yang and Fang, Weidong and Qin, Fei and Dai, Xuewu},
title = {PAMT: Phase-based Acoustic Motion Tracking in Multipath Fading Environments},
booktitle = {IEEE INFOCOM 2019 - IEEE Conference on Computer Communications},
year = {2019},
pages = {2386--2394},
doi = {10.1109/INFOCOM.2019.8737366}
}
|
| Mohamadi L, Dai X, Binns R, Busawon K and Djemai M (2019), "Output observer for fault detection in linear systems under disturbances", In Proceedings of the 2018 5th International Symposium on Environment-Friendly Energies and Applications, EFEA 2018., jan, 2019. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: Fault detection (FD) is the process of monitoring a system to check if some malfunctions or abnormalities occur in the system. One of the widely used fault detection mechanism is the so-called model based fault detection, where a model of the target system is involved to estimate the expected output of the system under healthy condition. Then a fault can be detected by comparing the actual measured output the estimated healthy output. By making use of the state estimation capability of observers, various observer-based fault detection schemes have been proposed to estimate the system output for the purpose of fault detection. However, it is worth noting that, different from state-feedback control, observer-based fault detection only concerns the output and it is not necessary to have a full state estimation. In this paper, a new type of observers, referred to as output observer, is proposed for fault detection, thus the unnecessary state estimation in observer-based fault detection can be avoided. First, an input/output system representation is developed to enable us build the output observer. Then a new approach of output observer design is presented, in which only the output variables are estimated instead of estimating any other system state variables. The application of output observer to fault detection in systems under disturbance is presented and systematic approach to design the FD scheme based on an optimisation method is given. This FD scheme is validated by simulating a model of a three wheels robot. |
BibTeX:
@inproceedings{Mohamadi2019,
author = {Mohamadi, Lamine and Dai, Xuewu and Binns, Richard and Busawon, Krishna and Djemai, Mohamed},
title = {Output observer for fault detection in linear systems under disturbances},
booktitle = {Proceedings of the 2018 5th International Symposium on Environment-Friendly Energies and Applications, EFEA 2018},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2019},
doi = {10.1109/EFEA.2018.8617076}
}
|
| Shen X, Liao Y and Dai X (2019), "BEM-based UKF channel estimation for 5G-enabled V2V channel", In 2018 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2018 - Proceedings., feb, 2019. , pp. 1214-1217. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: An Unscented Kalman Filter (UKF) based on Basis Expansion Model (BEM) is proposed in this paper to cope with the challenges of 5G-enabled V2V channel estimation. The BEM is adopted to reduce the estimation complexity and eliminate the inter-carrier interference (ICI). A channel estimation based on UKF which is able to jointly estimate the time-varying time correlation coefficients and channel impulse response (CIR) in a non-linear state space model is proposed. Simulation results illustrate that the proposed BEM-based UKF method shows better estimation accuracy, robustness and bit error rate (BER) performance than the traditional channel estimation methods in 5G-enabled V2V channel. |
BibTeX:
@inproceedings{Shen2019,
author = {Shen, Xuanfan and Liao, Yong and Dai, Xuewu},
title = {BEM-based UKF channel estimation for 5G-enabled V2V channel},
booktitle = {2018 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2018 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2019},
pages = {1214--1217},
doi = {10.1109/GlobalSIP.2018.8646337}
}
|
| Zong Y, Dai X, Busawon K, Gao Z and Binns R (2019), "Time synchronization of pulse-coupled oscillators for smart grids", In Proceedings of the 2018 5th International Symposium on Environment-Friendly Energies and Applications, EFEA 2018., jan, 2019. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: Wireless sensor networks has been widely recognized as a promising technology in smart grids. The sensors are installed on the critical power grid equipments to acquire the essential grid datas such as voltage, current and system frequency. And the data acquisition in smart grids is particularly time sensitive: the accurate timestamp of information is required from the sensors so that the absolute time of acquisition can be determined. Due to the crystal manufacturing tolerance and working conditions, the clocks of sensor nodes oscillators are non-identical and drifting. Thus, the key enabling technology time synchronization, aiming to provide a common sense of timing, is required in distributed smart grids sensor networks. Inspired by Peskin's model for self-synchronization of cardiac pacemaker, the pulse-coupled oscillators is implemented to the wireless sensor nodes to ensure the wireless networks of smart grids be able to achieve a common timescale, it is also suitable for distributed deployment in large-scale smart grids. In addition, the intensive simulations of three kinds of single-hop wireless sensor networks have been carried out to evaluate the performance of linear pulse-coupled non-identical oscillators. |
BibTeX:
@inproceedings{Zong2019,
author = {Zong, Yan and Dai, Xuewu and Busawon, Krishna and Gao, Zhiwei and Binns, Richard},
title = {Time synchronization of pulse-coupled oscillators for smart grids},
booktitle = {Proceedings of the 2018 5th International Symposium on Environment-Friendly Energies and Applications, EFEA 2018},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2019},
doi = {10.1109/EFEA.2018.8617078}
}
|
| Zong Y, Dai X, Gao Z, Binns R and Busawon K (2019), "Experimental evaluation of non-identical pulse-coupled oscillators synchronisation in ieee 802.15.4 wireless sensor networks", In IEEE International Conference on Industrial Informatics (INDIN)., jul, 2019. Vol. 2019-July, pp. 59-65. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: In this paper, a concise two-state clock model is proposed to describe the behaviour of drifting internal oscillator clocks with non-identical and time-varying frequencies, which provides a simple analytical solution of different coupling schemes' effects on synchronisation performance. The improved Pulse-Coupled Oscillators (PCO) scheme presented in this paper guarantees the synchronisation on non-identical and time-varying clocks. Meanwhile, it differs from classical PCO by scheduling the transmission of Syncs (i.e., the Pulses of clock) at different time slots. This collision-free pulse coupling scheme makes the concept of PCO applicable to wireless sensor networks, as it is practically impossible in realistic wireless networks for multiple oscillators to transmit Pulses at the same time. Furthermore, a proportional controller is adopted to correct the clock, and convergence and stability of the proposed algorithm are theoretically analysed, proved and evaluated by hardware experiments. The experimental results show that the improved PCO scheme can achieve synchronisation with the precision of around 400 μs on internal oscillator clocks of about 350, 000 ppm. |
BibTeX:
@inproceedings{Zong2019a,
author = {Zong, Yan and Dai, Xuewu and Gao, Zhiwei and Binns, Richard and Busawon, Krishna},
title = {Experimental evaluation of non-identical pulse-coupled oscillators synchronisation in ieee 802.15.4 wireless sensor networks},
booktitle = {IEEE International Conference on Industrial Informatics (INDIN)},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2019},
volume = {2019-July},
pages = {59--65},
doi = {10.1109/INDIN41052.2019.8972273}
}
|
2018 |
| Canyelles-Pericas P, Haigh P, Ghassemlooy Z, Burton A, Dai X, The Son T, Le-Minh H, Binns R and Busawon K (2018), "Chaos Synchronization in Visible Light Communications with Variable Delays Induced by Multipath Fading", Applied System Innovation., nov, 2018. Vol. 1(4), pp. 45. MDPI AG. |
| Abstract: Visible Light Communication (VLC) uses light-emitting diodes to provide wireless connectivity in public environments. Transmission security in this emerging channel is not trivial. Chaotic modulation techniques can provide encryption directly in the physical layer based on the random-alike evolution and strong synchronization prospect given by deterministic chaos. In secure chaotic inclusion or embedding methods, continuous-time chaos oscillator models need to be synchronized via a coupling carrier. Here we present a first numerical simulation study for the impact of the variable delays induced by line-of-sight and non-line-of-sight multipath fading in complete chaotic synchronization. More precisely, we analyze a chaotic Colpitts oscillator that is simultaneously transmitting the carrier to several mobile receivers via nine spotlights. Such induced delays depend on both the receiver position and the carrier frequency, influencing the complete synchronization required in modulation via chaotic inclusion. Correlation values for several receiver positions and carrier frequencies are presented, examining the progressive emergence of the multipath effect and its impact on chaotic synchronization. We show that, for the chaotic oscillator and coupling applied in the defined room settings, complete chaotic synchronization can be achieved and that it is robust up to the tens of MHz region. |
BibTeX:
@article{Canyelles-Pericas2018,
author = {Canyelles-Pericas, Pep and Haigh, Paul and Ghassemlooy, Zabih and Burton, Andrew and Dai, Xuewu and The Son, Tran and Le-Minh, Hoa and Binns, Richard and Busawon, Krishna},
title = {Chaos Synchronization in Visible Light Communications with Variable Delays Induced by Multipath Fading},
journal = {Applied System Innovation},
publisher = {MDPI AG},
year = {2018},
volume = {1},
number = {4},
pages = {45},
url = {http://www.mdpi.com/2571-5577/1/4/45},
doi = {10.3390/asi1040045}
}
|
| Gao S, Dai X, Hang Y, Guo Y and Ji Q (2018), "Airborne Wireless Sensor Networks for Airplane Monitoring System", Wireless Communications and Mobile Computing., may, 2018. Vol. 2018, pp. 1-18. Hindawi Limited. |
| Abstract: In traditional airplane monitoring system (AMS), data sensed from strain, vibration, ultrasound of structures or temperature, and humidity in cabin environment are transmitted to central data repository via wires. However, drawbacks still exist in wired AMS such as expensive installation and maintenance, and complicated wired connections. In recent years, accumulating interest has been drawn to performing AMS via airborne wireless sensor network (AWSN) system with the advantages of flexibility, low cost, and easy deployment. In this review, we present an overview of AMS and AWSN and demonstrate the requirements of AWSN for AMS particularly. Furthermore, existing wireless hardware prototypes and network communication schemes of AWSN are investigated according to these requirements. This paper will improve the understanding of how the AWSN design under AMS acquires sensor data accurately and carries out network communication efficiently, providing insights into prognostics and health management (PHM) for AMS in future. |
BibTeX:
@article{Gao2018,
author = {Gao, Shang and Dai, Xuewu and Hang, Yu and Guo, Yuyan and Ji, Qian},
title = {Airborne Wireless Sensor Networks for Airplane Monitoring System},
journal = {Wireless Communications and Mobile Computing},
publisher = {Hindawi Limited},
year = {2018},
volume = {2018},
pages = {1--18},
doi = {10.1155/2018/6025825}
}
|
| Lalam N, Ng WP, Dai X, Wu Q and Fu YQ (2018), "Performance Improvement of Brillouin Ring Laser Based BOTDR System Employing a Wavelength Diversity Technique", Journal of Lightwave Technology., feb, 2018. Vol. 36(4), pp. 1084-1090. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: In this paper technique is employed in a Brillouin optical time domain reflectometry (BOTDR) using a Brillouin ring laser (BRL) as a local oscillator. In the wavelength diversity technique, multiple wavelengths are injected into the sensing fiber, while the peak power of each wavelength is set below the nonlinear threshold level. This technique significantly maximizes the overall launch pump power, without activating the nonnegligible nonlinear effects, which overcomes the limitation of the conventional BOTDR system. The BRL, which is simple and cost-effective, that can be used to reduce the receiver bandwidth in the order of few MHz. In addition, a passive depolarizer is used to reduce the polarization noise. The proposed system is validated experimentally over a 50 km sensing fiber with a 5 m spatial resolution. The experimental results demonstrate a signal-to-noise ratio improvement of 5.1 dB, which corresponds to 180% improvement compared to a conventional BOTDR system. |
BibTeX:
@article{Lalam2018,
author = {Lalam, Nageswara and Ng, Wai Pang and Dai, Xuewu and Wu, Qiang and Fu, Yong Qing},
title = {Performance Improvement of Brillouin Ring Laser Based BOTDR System Employing a Wavelength Diversity Technique},
journal = {Journal of Lightwave Technology},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2018},
volume = {36},
number = {4},
pages = {1084--1090},
doi = {10.1109/JLT.2017.2766765}
}
|
| Lalam N, Ng WP, Dai X, Wu Q and Fu YQ (2018), "Performance analysis of Brillouin optical time domain reflectometry (BOTDR) employing wavelength diversity and passive depolarizer techniques", Measurement Science and Technology., jan, 2018. Vol. 29(2) Institute of Physics Publishing. |
| Abstract: textcopyright 2018 IOP Publishing Ltd. We propose and experimentally validate a wavelength diversity technique combined with a passive depolarizer in order to improve the performance of Brillouin optical time domain reflectometry (BOTDR). The wavelength diversity technique enables the maximization of the launch pump power and suppresses the nonlinear effects, the latter of which limits the conventional BOTDR performance. As a result, the signal-to-noise ratio increases, thus improving the measurement accuracy for strain and temperature. In addition, considering the complexity and expensive methods required for polarization noise suppression in BOTDR system, a simple, low-cost passive depolarizer is employed to reduce the polarization noise. The experimental results show that the signal-to-noise ratio is improved by 4.85 dB, which corresponds to 174% improvement compared to a conventional BOTDR system. |
BibTeX:
@article{Lalam2018a,
author = {Lalam, Nageswara and Ng, Wai Pang and Dai, Xuewu and Wu, Qiang and Fu, Yong Qing},
title = {Performance analysis of Brillouin optical time domain reflectometry (BOTDR) employing wavelength diversity and passive depolarizer techniques},
journal = {Measurement Science and Technology},
publisher = {Institute of Physics Publishing},
year = {2018},
volume = {29},
number = {2},
doi = {10.1088/1361-6501/aa9c6e}
}
|
| Shen X, Liao Y, Dai X, Zhao M, Liu K and Wang D (2018), "Joint channel estimation and decoding design for 5G-enabled V2V channel", China Communications., jul, 2018. Vol. 15(7), pp. 39-46. Editorial Department of China Communications. |
| Abstract: This paper addresses the problem of channel estimation in 5G-enabled vehicular-to-vehicular (V2V) channels with high-mobility environments and non-stationary feature. Considering orthogonal frequency division multiplexing (OFDM) system, we perform extended Kalman filter (EKF) for channel estimation in conjunction with Iterative Detector Decoder (IDD) at the receiver to improve the estimation accuracy. The EKF is proposed for jointly estimating the channel frequency response and the time-varying time correlation coefficients. And the IDD structure is adopted to reduce the estimation errors in EKF. The simulation results show that, compared with traditional methods, the proposed method effectively promotes the system performance. |
BibTeX:
@article{Shen2018,
author = {Shen, Xuanfan and Liao, Yong and Dai, Xuewu and Zhao, Ming and Liu, Kai and Wang, Dan},
title = {Joint channel estimation and decoding design for 5G-enabled V2V channel},
journal = {China Communications},
publisher = {Editorial Department of China Communications},
year = {2018},
volume = {15},
number = {7},
pages = {39--46},
doi = {10.1109/CC.2018.8424581}
}
|
| Zong Y, Dai X, Gao Z, Binns R and Busawon K (2018), "Simulation and evaluation of pulse-coupled oscillators in wireless sensor networks", Systems Science & Control Engineering., jan, 2018. Vol. 6(1), pp. 337-349. Taylor and Francis Ltd.. |
BibTeX:
@article{Zong2018c,
author = {Zong, Yan and Dai, Xuewu and Gao, Zhiwei and Binns, Richard and Busawon, Krishna},
title = {Simulation and evaluation of pulse-coupled oscillators in wireless sensor networks},
journal = {Systems Science & Control Engineering},
publisher = {Taylor and Francis Ltd.},
year = {2018},
volume = {6},
number = {1},
pages = {337--349},
url = {https://www.tandfonline.com/doi/full/10.1080/21642583.2018.1496043},
doi = {10.1080/21642583.2018.1496043}
}
|
| Aggarwal G, Dai X, Binns R and Saatchi R (2018), "Experimental Demonstration of EEG Signal Transmission Using VLC Deploying LabView", In 3rd International Conference and Workshops on Recent Advances and Innovations in Engineering, ICRAIE 2018., jul, 2018. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: To diagnose the brain abnormalities and diseases such as comma, epilepsy and many more comprehensive studies of the brain is essential which is done by placing electrodes on the scalp of the brain and examining the electrical brain activity and this whole procedure is known as Electroencephalogram (EEG). Presently, the EEG in hospitals is done using wires, several electrodes which require time for preparation and in some cases involve surgery, however, the non-invasive EEG has the potential to examine the brain activity without any surgery. Additionally, the technology used in hospitals for EEG is RF-based which could interfere with electronics devices and might affect the health of the patient as due to Electromagnetic interference specifically in the areas where the use of mobile phones and RF is prohibited. Hence, keeping in view the challenges of RF based EEG in hospitals this research work focuses on the Optical transmission of EEG signals using LED/PD pair deploying Labview. Experiments were carried out in LOS condition using On-Off Keying Non-Return to Zero (OOK-NRZ) modulation scheme employing LED/PD pair. The experimental results show the improvement in SNR in comparison to available literature and show the accuracy and reliability of the proposed system. |
BibTeX:
@inproceedings{Aggarwal2018,
author = {Aggarwal, Geetika and Dai, Xuewu and Binns, Richard and Saatchi, Reza},
title = {Experimental Demonstration of EEG Signal Transmission Using VLC Deploying LabView},
booktitle = {3rd International Conference and Workshops on Recent Advances and Innovations in Engineering, ICRAIE 2018},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2018},
doi = {10.1109/ICRAIE.2018.8710396}
}
|
| Zong Y, Luo K, Dai X and Gao Z (2018), "Implementation of timestamped pulse-coupled oscillators in IEEE 802.15.4 networks", In ICAC 2018 - 2018 24th IEEE International Conference on Automation and Computing: Improving Productivity through Automation and Computing., sep, 2018. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: Time Synchronization (TS) is a key enabling technology of mission-critical Wireless Sensor Networks (WSNs) to provide a common timescale for distributed sensor nodes. Inspired by synchronous flashing of fireflies, a bio-inspired model, Pulse-Coupled Oscillators (PCO), has been intensively studied. The most studies on PCOs are theoretical work, and the assumption is given that oscillators broadcast and receive the Pulses simultaneously when synchronization of a network is achieved. This is not true when it comes to any real-world environments. From the viewpoint of WSNs, the clock of a sensor node driven by crystal oscillators can be modelled as an oscillator, and Pulse firing can be implemented by transmitting a packet. However, the concurrent transmission of Pulse packets is impossible due to the packet collision in the single wireless channel. To avoid this issue in WSNs, this paper adopts a desynchronization mechanism, in which the Pulse packets are transmitted to the wireless channel in a uniformly distributed fashion and in accordance with standard IEEE 802.15.4. A hardware testbed is developed to implement the desynchronized pulse-coupled oscillators, and it can also be extended to the large-scale wireless sensor networks. |
BibTeX:
@inproceedings{Zong2018,
author = {Zong, Yan and Luo, Kexin and Dai, Xuewu and Gao, Zhiwei},
title = {Implementation of timestamped pulse-coupled oscillators in IEEE 802.15.4 networks},
booktitle = {ICAC 2018 - 2018 24th IEEE International Conference on Automation and Computing: Improving Productivity through Automation and Computing},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2018},
doi = {10.23919/IConAC.2018.8749038}
}
|
| Zong Y, Dai X, Gao Z, Busawon K and Zhu J (2018), "Modelling and Synchronization of Pulse-Coupled Non-identical Oscillators for Wireless Sensor Networks", In Proceedings - IEEE 16th International Conference on Industrial Informatics, INDIN 2018., sep, 2018. , pp. 101-107. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: Time synchronization in wireless sensor networks,aiming to provide a common sense of timing among distributed sensor nodes, is a key enabling technology for many applications, such as collaborative condition monitoring, time-of-flight localization and underwater navigation and tactical surveillance. In order to solve the challenges of the manufacturing tolerance and working condition variations in any real-world environments, a novel state-space model for pulse-coupled non-identical oscillators is proposed to model a realistic clock oscillator with nonidentical and time-varying frequency. A state feedback correction, referred to as hybrid coupling mechanism, is also proposed to ensure the system move into steady state, thus achieving time synchronization in wireless sensor networks. Furthermore, the intensive simulations of single-hop wireless sensor networks have been carried out to evaluate the performance of proposed pulsecoupled non-identical oscillators. It is shown that a partially connected wireless network consisting of 50 non-identical pulsecoupled oscillators can achieve the synchronization with the precision of 40us. |
BibTeX:
@inproceedings{Zong2018a,
author = {Zong, Yan and Dai, Xuewu and Gao, Zhiwei and Busawon, Krishna and Zhu, Jiwen},
title = {Modelling and Synchronization of Pulse-Coupled Non-identical Oscillators for Wireless Sensor Networks},
booktitle = {Proceedings - IEEE 16th International Conference on Industrial Informatics, INDIN 2018},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2018},
pages = {101--107},
doi = {10.1109/INDIN.2018.8472059}
}
|
| Zong Y, Dai X, Gao Z, Busawon K, Binns R and Elliott I (2018), "Synchronization of Pulse-Coupled Oscillators for IEEE 802.15.4 Multi-Hop Wireless Sensor Networks", In 2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: As a key enabling technology in mission-critical Wireless Sensor Networks (WSNs), time synchronization provides a common timescale for distributed sensor nodes in many wireless applications, such as coordinated control and underwater navigation and tactical surveillance. Inspired by the behaviour of fireflies, along with mathematical model, Pulse-Coupled Oscillators (PCO), has been proposed to enable synchronization in complex networks, where all the PCO's firing signal Pulses are broadcasted simultaneously when synchronization is achieved. The requirement of zero-drift clock oscillators, fully-connected network and concurrent transmission of Pulses are, in reality, impossible to achieve. To avoid transmission collision and enable the PCO extension in the multi-hop WSNs, the desynchronization mechanism is adopted to enable the Pulse packets to be transmitted to the wireless channel in a uniformly distributed fashion. Due to the contention-free period's feature of low-latency, thereby avoiding the need to wait for a random and potentially long period until the channel is available, the PCO's Pulse packets are transmitted in the contention-free period of IEEE 802.15.4-2015 superframe. Thus, a novel state-space model for desynchronization-based pulse-coupled nonidentical oscillators is proposed to model a realistic drifting clock oscillator. Moreover, the timestamped Pulse packets are transmitted to determine the offset of connected sensor nodes, and an attenuated clock correction scheme is adopted to correct the local drifting clocks by using measured offset and skew. The intensive simulations of the three-hop three-cluster wireless network and the seven-hop linear network have been carried out to evaluate performance of timestamped PCO with desyn-chronization method. |
BibTeX:
@inproceedings{Zong2018b,
author = {Zong, Yan and Dai, Xuewu and Gao, Zhiwei and Busawon, Krishna and Binns, Richard and Elliott, Ian},
title = {Synchronization of Pulse-Coupled Oscillators for IEEE 802.15.4 Multi-Hop Wireless Sensor Networks},
booktitle = {2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2018},
doi = {10.1109/GLOCOM.2018.8647633}
}
|
| Yong LIAO, Xuan-fan SHEN, DAI Xue-wu Z and Dan WANG (2018), "Joint iterative detector and decoder channel estimation based on extended kalman filter", ACTA ELECTONICA SINICA. Vol. 46(3), pp. 554. |
BibTeX:
@article{LIAO2018,
author = {LIAO, Yong and SHEN, Xuan-fan and DAI Xue-wu, ZHOU and WANG, Dan},
title = {Joint iterative detector and decoder channel estimation based on extended kalman filter},
journal = {ACTA ELECTONICA SINICA},
year = {2018},
volume = {46},
number = {3},
pages = {554},
url = {1J}
}
|
2017 |
| Saied O, Ghassemlooy Z, Tang X, Dai X, Le Minh H and Lin B (2017), "Position Encoded Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing in Visible Light Communications", Journal of Communications and Information Networks., dec, 2017. Vol. 2(4), pp. 1-10. |
| Abstract: A PE-ACO-OFDM (Position-Encoded Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing) signaling scheme for intensity modulation and direct detection is introduced in this paper, where the anti-asymmetry characteristics of ACO-OFDM are exploited to improve the rate of data transmission. This is achieved by reducing the symbol duration of the ACO-OFDM signal, where only the first half of ACO-OFDM is used to transmit the ACO-OFDM data symbol after inverting its negative samples to positive ones. In addition, encoded ACO-OFDM samples are combined with every ACO-OFDM symbol to allow the receiver to identify the position of the inverted samples. Simulation results are introduced, and it is shown that the data rates of PE-ACO-OFDM improve by 33% compared with ACO-OFDM, when a 256-quadrature amplitude modulation scheme is considered as the encoded constellation order. It is also shown that the signal to noise ratio of the proposed PE-ACO-OFDM is higher by almost 1 dB compared with the traditional ACO-OFDM. |
BibTeX:
@article{Saied2017,
author = {Saied, Osama and Ghassemlooy, Zabih and Tang, Xuan and Dai, Xuewu and Le Minh, Hoa and Lin, Bangjiang},
title = {Position Encoded Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing in Visible Light Communications},
journal = {Journal of Communications and Information Networks},
year = {2017},
volume = {2},
number = {4},
pages = {1--10},
doi = {10.1007/s41650-017-0038-2}
}
|
| Canyelles-Pericas P, Dai X, Binns R and Busawon K (2017), "Decomposing chaos into a harmonic oscillator with nonlinear feedback using pole placement methods", In 2017 IEEE 56th Annual Conference on Decision and Control (CDC)., dec, 2017. , pp. 2078-2082. |
| Abstract: This paper suggests a simple method for decomposing several chaotic systems into a harmonic oscillator provided with a nonlinear feedback. The chaotic oscillators analyzed include low order, non-delayed and continuous time models. The proposed decomposition method consists in three steps. First, the chaotic system is modelled as a combination of a linear component with a nonlinear feedback. Second, the linear part is modified so that it is transformed into a conventional harmonic oscillator with pole placement means. The position of the poles is set arbitrarily to guarantee its stability while maintaining the desired properties of sustained oscillation frequency. Finally, the feedback system is designed to keep the original nonlinearities while cancelling the changes introduced in the linear part. This, in turn, retrieves the initial chaotic dynamics. Essentially this procedure allows switching from chaotic to harmonic dynamics -or vice-versa-as required by application demands. The idea is presented in a generic form so that it can be applied to a variety of fields. The initial motivation was set in the context of secure chaotic communications. The decomposition procedure has been demonstrated and validated through numerical simulation of various well-known chaotic oscillators such as Duffing, Lorenz and Chua. |
BibTeX:
@inproceedings{Canyelles-Pericas2017,
author = {Canyelles-Pericas, P and Dai, X and Binns, R and Busawon, K},
title = {Decomposing chaos into a harmonic oscillator with nonlinear feedback using pole placement methods},
booktitle = {2017 IEEE 56th Annual Conference on Decision and Control (CDC)},
year = {2017},
pages = {2078--2082},
doi = {10.1109/CDC.2017.8263953}
}
|
| Lalam N, Ng WP, Dai X, Wu Q and Fu YQ (2017), "Sensing range improvement of brillouin optical time domain reflectometry (BOTDR) using inline erbium-doped fibre amplifier", In 2017 IEEE SENSORS., oct, 2017. , pp. 1-3. |
| Abstract: In this paper, we demonstrate sensing range improvement of Brillouin optical time-domain reflectometry (BOTDR) using an inline erbium-doped fibre amplifier to compensate the sensing fibre loss. In addition, a passive depolarizer is used based on the polarization beam splitter to suppress the polarization noise. The proof-of-concept is demonstrated experimentally using a 50 km sensing fibre with a 5 m spatial resolution. The strain and temperature errors at end of the sensing fibre are 23 μ𝜖 and 1.08°C, respectively. |
BibTeX:
@inproceedings{Lalam2017,
author = {Lalam, N and Ng, W P and Dai, X and Wu, Q and Fu, Y Q},
title = {Sensing range improvement of brillouin optical time domain reflectometry (BOTDR) using inline erbium-doped fibre amplifier},
booktitle = {2017 IEEE SENSORS},
year = {2017},
pages = {1--3},
doi = {10.1109/ICSENS.2017.8233878}
}
|
| Liao Y, Shen X, Dai X, Zhao M, Liu K, Li D and Zhou X (2017), "EKF-Based Joint Channel Estimation and Decoding Design for Non-Stationary OFDM Channel", In GLOBECOM 2017 - 2017 IEEE Global Communications Conference., dec, 2017. , pp. 1-6. |
| Abstract: Non-stationarity is a key feature of wireless channels in high-mobility environments, such as high speed railway, which is one of the barriers on improving the communication quality if not being well treated in channel estimation. Traditional Kalman Filter (KF)- based channel estimation methods that assume constant time correlation coefficients based on Jakes model are no longer valid in non-stationary channel. To address the challenges of channel estimation in high-mobility OFDM communications, a joint design of channel estimation, detection and decoding is proposed on the basis of Extended Kalman Filter (EKF) and Iterative Detector & Decoder (IDD) technology in this paper. The dynamics of non-stationary channel is characterized as a time-varying autoregressive (AR) process and a Decision-directed EKF is developed to track both the channel frequency response (CFR) and the time correlation coefficients of the time-varying AR process. In order to mitigate the error propagation with Decision-directed at data symbols, the IDD is adopted and integrated with the EKF (IDD-EKF). And, instead of Decision-directed, this paper proposes a novel log-likelihood ratio (LLR)-directed mechanism, in which the a posteriori LLRs are utilized to update the weighting matrix of EKF. The simulation results of estimating a typical non-stationary WINNER-II channel show that, compared with traditional methods, the proposed method effectively overcomes the error propagation problems and improves the channel estimation accuracy. The overall system performance in terms of signal-to-noise ratio (SNR) gain is about 3dB at 200km/h. |
BibTeX:
@inproceedings{Liao2017,
author = {Liao, Yong and Shen, Xuanfan and Dai, Xuewu and Zhao, Ming and Liu, Kai and Li, Daotong and Zhou, Xin},
title = {EKF-Based Joint Channel Estimation and Decoding Design for Non-Stationary OFDM Channel},
booktitle = {GLOBECOM 2017 - 2017 IEEE Global Communications Conference},
year = {2017},
pages = {1--6},
doi = {10.1109/GLOCOM.2017.8254544}
}
|
| Zong Y, Dai X and Gao Z (2017), "A software simulator of discrete pulse-coupled oscillators (PCO) time synchronization in wireless sensor networks", In 2017 23rd International Conference on Automation and Computing (ICAC)., sep, 2017. , pp. 1-7. |
| Abstract: Time synchronization, aiming to provide a common timescale among distributed sensor nodes, is a key enabling technology for many applications, such as collaborative condition monitoring and localization detection. Due to the complexity of time synchronization in wireless sensor networks, the Discrete Event Simulator is recommended to adopt resulting from the feature that the behavior of a complex is represented as an order sequence of well-defined event in time. In this paper, the PCO clock is firstly implemented into the open-source software simulator OMNeT++ by using desynchronization mechanism under a realistic scenario, and it can also be simulated at an adjustable and higher resolution. The developed relay node, can either be a Full Function Device or a Reduced Function Device, enables the high scalability for multi-node and multi-hop simulation. In addition, the shared code of this project on the GitHub directly benefits the researchers and engineers in communication. |
BibTeX:
@inproceedings{Zong2017,
author = {Zong, Yan and Dai, Xuewu and Gao, Zhiwei},
title = {A software simulator of discrete pulse-coupled oscillators (PCO) time synchronization in wireless sensor networks},
booktitle = {2017 23rd International Conference on Automation and Computing (ICAC)},
year = {2017},
pages = {1--7},
doi = {10.23919/IConAC.2017.8081997}
}
|
2016 |
| Gao S, Dai X, Liu Z, Tian G and Yuan S (2016), "High-Performance Wireless Piezoelectric Sensor Network for Distributed Structural Health Monitoring", International Journal of Distributed Sensor Networks., jan, 2016. Vol. 12(3), pp. 1-16. Institute of Electrical and Electronics Engineers Inc.. |
| Abstract: This paper presents the development of a newly designed wireless piezoelectric (PZT) sensor platform for distributed large-scale structure health monitoring, where real-time data acquisition with high sampling rate up to 12.5 Msps (sample per second) and distributed lamb-wave data processing are implemented. In the proposed wireless PZT network, a set of PZT transducers are deployed at the surface of the structure, a lamb-wave is excited, and its propagation characteristics within the structure are inspected to identify damages. The developed wireless node platform features a digital signal processor (DSP) of TMS320F28335 and an improved IEEE 802.15.4 wireless data transducer RF233 with up to 2 Mbps data rate. Each node supports up to 8 PZT transducers, one of which works as the actuator generating the lamb-wave at an arbitrary frequency, while the responding vibrations at other PZT sensors are sensed simultaneously. In addition to hardware, embedded signal processing and distributed data processing algorithm are designed as the intelligent “brain” of the proposed wireless monitoring network to extract features of the PZT signals, so that the data transmitted over the wireless link can be reduced significantly. |
BibTeX:
@article{Gao2016,
author = {Gao, Shang and Dai, Xuewu and Liu, Zheng and Tian, Guiyun and Yuan, Shenfang},
title = {High-Performance Wireless Piezoelectric Sensor Network for Distributed Structural Health Monitoring},
journal = {International Journal of Distributed Sensor Networks},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
year = {2016},
volume = {12},
number = {3},
pages = {1--16},
url = {https://www.hindawi.com/journals/ijdsn/2016/3846804/cta/},
doi = {10.1155/2016/3846804}
}
|
| Liu Z, Tian G, Cao W, Dai X, Shaw B and Lambert R (2016), "Non-invasive load monitoring of induction motor drives using magnetic flux sensors", IET Power Electronics., sep, 2016. Vol. 10(2), pp. 189-195. Institution of Engineering and Technology (IET). |
| Abstract: Existing load monitoring methods for induction machines are generally effective, but suffer from sensitivity problems at low speeds and non-linearity problems at high supply frequencies. This study proposes a new noninvasive load monitoring method based on giant magnetoresistance flux sensors to trace stray flux leaking from induction motors. Finite element analysis is applied to analyse stray flux features of test machines. Contrary to the conventional methods of measuring stator and/or rotator rotor voltage and current, the proposed method measures the dynamic magnetic field at specific locations and provides time-spectrum features (e.g. spectrograms), response time load and stator/rotor characteristics. Three induction motors with different starting loading profiles are tested at two separate test benches and their results are analysed in the time-frequency domain. Their steady features and dynamic load response time through spectrograms under variable loads are extracted to correlate with load variations based on spectrogram information. In addition, the transient stray flux spectrogram and time information are more effective for load monitoring than steady state information from numerical and experimental studies. The proposed method is proven to be a low-cost and non-invasive method for induction machine load monitoring. textcopyright The Institution of Engineering and Technology 2016. |
BibTeX:
@article{Liu2016,
author = {Liu, Zheng and Tian, Guiyun and Cao, Wenping and Dai, Xuewu and Shaw, Brian and Lambert, Robert},
title = {Non-invasive load monitoring of induction motor drives using magnetic flux sensors},
journal = {IET Power Electronics},
publisher = {Institution of Engineering and Technology (IET)},
year = {2016},
volume = {10},
number = {2},
pages = {189--195},
doi = {10.1049/iet-pel.2016.0304}
}
|
| Mousa FIK, Le-Minh H, Ghassemlooy Z, Dai X, Tran ST, Boucouvalas AC and Liaw S-K (2016), "Indoor localization system utilizing two visible light emitting diodes", Optical Engineering. Vol. 55(11) SPIE. |
| Abstract: Indoor positioning or localization based on visible light communications (VLC) is an emerging technology with wide applications. In conventional localization schemes, the trilateration technique is widely used with at least three separate lighting sources to determine the user's location. An indoor VLC positioning scheme based on the optical power distributions of only two light emitting diodes (LEDs) is reported for different environments. We have used two received signal strength indications to determine the user's position based on the LEDs configuration offering less complexity. We propose comprehensive mathematical models for the VLC localization system considering the noise and its impact on the user's location, and numerically evaluated it over a range of signal-to-noise ratios (SNRs). In addition, it is compared to the results with the exiting trilateration technique. The performance of the proposed system is evaluated with a reported accuracy of <20 cm for an SNR of >13 dB. |
BibTeX:
@article{Mousa2016,
author = {Mousa, Farag I K and Le-Minh, Hoa and Ghassemlooy, Zabih and Dai, Xuewu and Tran, Son T and Boucouvalas, Anthony C and Liaw, Shien-Kuei},
title = {Indoor localization system utilizing two visible light emitting diodes},
journal = {Optical Engineering},
publisher = {SPIE},
year = {2016},
volume = {55},
number = {11},
url = {http://dx.doi.org/10.1117/1.OE.55.11.116114},
doi = {10.1117/1.OE.55.11.116114}
}
|
| Saied O, Ghassemlooy Z, Dai X, Minh HL, Popoola WO, Liaw S-K and Zhang M (2016), "Pilot-Aided Asymmetrically Clipped Optical OFDM in Visible Light Communication", The Mediterranean Journal of Electronics and Communications. Vol. 12(2), pp. 64-71.
[BibTeX] |
BibTeX:
@article{Saied2016,
author = {Saied, Osama and Ghassemlooy, Z and Dai, Xuewu. and Minh, Hoa Le and Popoola, Wasiu O and Liaw, Shien-Kuei and Zhang, Min},
title = {Pilot-Aided Asymmetrically Clipped Optical OFDM in Visible Light Communication},
journal = {The Mediterranean Journal of Electronics and Communications},
year = {2016},
volume = {12},
number = {2},
pages = {64--71}
}
|
| Cowlyn J, Dai X and Putrus G (2016), "Wireless sensor networks for in situ energy efficiency monitoring", In 2016 International Conference for Students on Applied Engineering (ICSAE)., oct, 2016. , pp. 484-490. |
| Abstract: Energy efficiency in manufacturing is critical for a reduction of overall energy consumption and also better demand response (DR) to offset non-essential peak energy against rising cost of energy. Motivated by our industrial partner's demands on precise and timely information about the energy usage, this paper presents the design and testing of a wireless sensor network (WSN) for collecting electrical energy consumption and power quality monitoring within an industrial environment. The proposed network includes a set of in situ wireless nodes each connected to a production line and a data sink located in a control room for data collection, data visualization and user interaction. The features of this system include the ability to real time monitor energy consumption, low cost and cable-free deployment of multiple monitor nodes to cause no additional hazards in the production environment. This system enables that production line energy consumption can be monitored effectively using inexpensive sensors and data can be acquired, without disruption of production, in order to determine energy usage between different stages and lines of production and more accurately grade customer pricing per part produced. |
BibTeX:
@inproceedings{Cowlyn2016,
author = {Cowlyn, Joe and Dai, Xuewu and Putrus, Ghanim},
title = {Wireless sensor networks for in situ energy efficiency monitoring},
booktitle = {2016 International Conference for Students on Applied Engineering (ICSAE)},
year = {2016},
pages = {484--490},
doi = {10.1109/ICSAE.2016.7810240}
}
|
| Lalam N, Ng WP, Wu Q, Dai X and Fu YQ (2016), "Perfluorinated polymer optical fiber for precision strain sensing based on novel SMS fiber structure", In 2016 10th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP). , pp. 1-3. |
BibTeX:
@inproceedings{Lalam2016,
author = {Lalam, N and Ng, W P and Wu, Q and Dai, X and Fu, Y Q},
title = {Perfluorinated polymer optical fiber for precision strain sensing based on novel SMS fiber structure},
booktitle = {2016 10th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)},
year = {2016},
pages = {1--3},
doi = {10.1109/CSNDSP.2016.7573938}
}
|
2015 |
| Huang Y, Li T, Dai X, Wang H and Yang Y (2015), "TS2: A Realistic IEEE 1588 Time Synchronization Simulator for Mobile Wireless Sensor Networks", SIMULATION: Transactions of The Society for Modeling and Simulation International., feb, 2015. Vol. 91(2), pp. 164-180. |
| Abstract: This paper presents the development of a simulator, TS2 (time-synchronization simulator), for realistically simulating and studying the performance of the IEEE 1588 precise time protocol (PTP) in IEEE 802.15.4 (TI CC2420 chip)-based mobile wireless sensor networks (WSNs). The PTP has the advantage of achieving high time precision at a low cost. It was designed for a wired Ethernet with requirements of symmetric communication paths and accurate time stamping, which is difficult for the low-cost WSNs to meet, as WSNs suffer more from overwhelming transmission delay jitters. An analytic solution to the performance of the PTP in WSNs is not possible, and it is of importance to evaluate the performance by realistic simulation. Based on the open-source OMNeT++ simulation engine, a realistic simulator was developed to simulate the PTP in IEEE 802.15.4 networks. There are two main contributions and benefits of the developed simulator. (1) Reality and fidelity: the WSN node's various layers (including radio channels and TI CC2420 chip), drifting oscillator clocks and PTPs are simulated realistically. The drifting clock is simulated at an adjustable and higher resolution. (2) Support to both hardware and software time stamping, and the time-stamping uncertainties, by using a separated modular time-stamping module. It also has other features (such as extendibility and code-reusability, mobile WSN nodes, scalability for multi-node, multi-hop simulation). Finally, to demonstrate the simulator's application to evaluating a PTP-based clock correction algorithm, a direct servo clock adjustment algorithm (i.e., a P controller) for a TI CC2420-based WSN was simulated and its performance was analyzed. |
BibTeX:
@article{Huang2015,
author = {Huang, Y and Li, T and Dai, X and Wang, H and Yang, Y},
title = {TS2: A Realistic IEEE 1588 Time Synchronization Simulator for Mobile Wireless Sensor Networks},
journal = {SIMULATION: Transactions of The Society for Modeling and Simulation International},
year = {2015},
volume = {91},
number = {2},
pages = {164--180},
doi = {10.1177/0037549714564791}
}
|
| Gao S, Dai X, Liu Z, Tian G and Yuan S (2015), "A wireless piezoelectric sensor network for distributed structural health monitoring", In 2015 IEEE International Conference on Wireless for Space and Extreme Environments WiSEE. |
| Abstract: This paper presents the development of a newly designed wireless piezoelectric (PZT) sensor platform for distributed active structure health monitoring (such as aircraft wings and bridges). The developed wireless PZT-sensor network features real-time data acquisition with high sampling rate up to 12.5MSPS (sample per second), distributed lamb-wave data processing and energy saving by reducing the amount of data in wireless transmission. In the proposed wireless PZT network, a set of PZT transducers deployed at the surface of the structure, and a lamb wave is excited and its propagation characteristics within the structure are inspected to identify possible damages. The developed wireless node platform benefits from a digital signal processor (DSP) of TMS320F28335 and an improved IEEE 802.15.4 wireless data transducer RF233 with up to 2Mbps data rate. Each node supports up to 8 PZT transducers, one of which may work as the actuator generating the Lamb wave at an arbitrary frequency, while the responding vibrations at other PZT sensors are sensed simultaneously. In addition to hardware, embedded signal processing and distributed data processing algorithm are designed as the intelligent `brain' of the proposed wireless monitoring network to extract features of the PZT signals, so that the data transmitted over the wireless link can be reduced significantly. |
BibTeX:
@inproceedings{Gao2015,
author = {Gao, Shang and Dai, Xuewu and Liu, Zheng and Tian, Guiyun and Yuan, Shenfang},
title = {A wireless piezoelectric sensor network for distributed structural health monitoring},
booktitle = {2015 IEEE International Conference on Wireless for Space and Extreme Environments WiSEE},
year = {2015},
doi = {10.1109/WiSEE.2015.7393107}
}
|
2014 |
| Dai X, Omiyi PE, Bür K and Yang Y (2014), "Interference-aware convergecast scheduling in wireless sensor/actuator networks for active airflow control applications", Wireless Communications and Mobile Computing. Vol. 14(3), pp. 396-408. Wiley Online Library. |
| Abstract: Emerging wireless sensor/actuator network (WSAN) technology has the potential to enable semi-autonomous airflow control to improve the aerodynamic performance of aircraft. In this paper, a WSAN comprising of multiple linear sensor clusters terminated by actuators is proposed for active airflow control with the objective of minimizing convergecast latency. Here, the convergecast delay is defined as the time required from the beginning of a sampling period to all all sensor's data of this sampling period is received by the actuator. The objective is achieved by minimizing the separation distance of concurrent data transmission so that the number of nodes sending data in the same time slot is maximized. The problem turns into a scheduling problem with a proper selection of interference separation. However, most existing work on the scheduling in linear networks use the minimum separation of two hops to avoid collisions. This paper examines the relationship between the hop separation, signal-to-noise ratio, and the latency to make a selection of interference separation. A new interference aware hybrid line scheduling (HLS) algorithm is proposed and its energy consumption is analyzed. Compared with other line scheduling policies, the analysis and simulation results show that, at moderately high node densities, the proposed HLS with carefully selected hop separation is able to reduce both the delay by up to 15% and the energy consumption somehow. |
BibTeX:
@article{Dai2014,
author = {Dai, Xuewu and Omiyi, Peter E and Bür, Kaan and Yang, Yang},
title = {Interference-aware convergecast scheduling in wireless sensor/actuator networks for active airflow control applications},
journal = {Wireless Communications and Mobile Computing},
publisher = {Wiley Online Library},
year = {2014},
volume = {14},
number = {3},
pages = {396--408},
doi = {10.1002/wcm.2190}
}
|
| Lv B, Huang Y, Li T, Dai X, He M, Zhang W and Yang Y (2014), "Simulation and performance analysis of the ieee1588 ptp with kalman filtering in multi-hop wireless sensor networks", Journal of networks. Vol. 9(12), pp. 3445. Citeseer.
[BibTeX] |
BibTeX:
@article{Lv2014,
author = {Lv, Baoqiang and Huang, Yiwen and Li, Taihua and Dai, Xuewu and He, Muxi and Zhang, Wuxiong and Yang, Yang},
title = {Simulation and performance analysis of the ieee1588 ptp with kalman filtering in multi-hop wireless sensor networks},
journal = {Journal of networks},
publisher = {Citeseer},
year = {2014},
volume = {9},
number = {12},
pages = {3445}
}
|
2013 |
| Dai X and Gao Z (2013), "From model, signal to knowledge: A data-driven perspective of fault detection and diagnosis", IEEE Transaction on Industrial Informatics. Vol. 9(4), pp. 2226-2238. |
| Abstract: This review paper is to give a full picture of fault detection and diagnosis (FDD) in complex systems from the perspective of data processing. As a matter of fact, an FDD system is a data-processing system on the basis of information redundancy, in which the data and human's understanding of the data are two fundamental elements. Human's understanding may be an explicit input-output model representing the relationship among the system's variables. It may also be represented as knowledge implicitly (e.g., the connection weights of a neural network). Therefore, FDD is done through some kind of modeling, signal processing, and intelligence computation. In this paper, a variety of FDD techniques are reviewed within the unified data-processing framework to give a full picture of FDD and achieve a new level of understanding. According to the types of data and how the data are processed, the FDD methods are classified into three categories: model-based online data-driven methods, signal-based methods, and knowledge-based history data-driven methods. An outlook to the possible evolution of FDD in industrial automation, including the hybrid FDD and the emerging networked FDD, are also presented to reveal the future development direction in this field. |
BibTeX:
@article{Dai2013,
author = {Dai, X and Gao, Z},
title = {From model, signal to knowledge: A data-driven perspective of fault detection and diagnosis},
journal = {IEEE Transaction on Industrial Informatics},
year = {2013},
volume = {9},
number = {4},
pages = {2226--2238},
doi = {10.1109/TII.2013.2243743}
}
|
| Liao Y, X. Dai, Liu G, Yang Y and Yang S (2013), "Fault detection and eigenstructure optimization in IEEE 802.11 wireless sensor actuator networks for building automation", International Journal of Adaptive Control and Signal Processing., sep, 2013. Vol. 27(9), pp. 793-808. |
| Abstract: There are signs that wireless sensor actuator networks can be used in time-sensitive industrial processes to reduce cable deployment and increase flexibility. This paper investigates the time-sensitive fault detector design in wireless sensor actuator networks subject to random packet delays and packet losses. The impacts of wireless packet delays and losses are modeled as external unknown disturbances and a memory block is introduced to deal with the packet losses and long delays. A frequency component estimation method is proved to estimate the frequency of these unknown disturbances. An eigenstructure optimization method is proposed to enhance the fault detector's sensitivity to the fault and the robustness against the delays and packet losses. The fault detection performance in a wireless building automation system is demonstrated by hybrid MATLAB/NS2 simulation. |
BibTeX:
@article{Liao2013,
author = {Liao, Y and X. Dai and Liu, G and Yang, Y and Yang, S},
title = {Fault detection and eigenstructure optimization in IEEE 802.11 wireless sensor actuator networks for building automation},
journal = {International Journal of Adaptive Control and Signal Processing},
year = {2013},
volume = {27},
number = {9},
pages = {793--808},
doi = {10.1002/acs.2359}
}
|
| Qin F, Xuewu Dai and Mitchell JE (2013), "Effective-SNR Estimation for Wireless Sensor Network Using Kalman Filter", Ad Hoc Networks., may, 2013. Vol. 11(3), pp. 944-958. |
| Abstract: In many Wireless Sensor Network (WSN) applications, the availability of a simple yet accurate estimation of the RF channel quality is vital. However, due to measurement noise and fading effects, it is usually estimated through probe or learning based methods, which result in high energy consumption or high overheads. We propose to make use of information redundancy among indicators provided by the IEEE 802.15.4 system to improve the estimation of the link quality. A Kalman filter based solution is used due to its ability to give an accurate estimate of the un-measurable states of a dynamic system subject to observation noise. In this paper we present an empirical study showing that an improved indicator, termed Effective-SNR, can be produced by combining Signal to Noise Ratio (SNR) and Link Quality Indicator (LQI) with minimal additional overhead. The estimation accuracy is further improved through the use of Kalman filtering techniques. Finally, experimental results demonstrate that the proposed algorithm can be implemented on resource constraints devices typical in WSNs. |
BibTeX:
@article{Qin2013,
author = {Qin, Fei and Xuewu Dai and Mitchell, John E},
title = {Effective-SNR Estimation for Wireless Sensor Network Using Kalman Filter},
journal = {Ad Hoc Networks},
year = {2013},
volume = {11},
number = {3},
pages = {944--958},
doi = {10.1016/j.adhoc.2012.11.002}
}
|
| Tan X-w, Zhang Leiand Liu S-q and Dai X (2013), "An online broken bar fault detection method and its application to squirrel-cage asynchronous motors", International Journal of Modelling, Identification and Control. Vol. 19(1), pp. 89 - 97.
[BibTeX] |
BibTeX:
@article{Tan2013,
author = {Tan, Xing-wen and Zhang Leiand Liu, Shu-qiang and Dai, Xuewu},
title = {An online broken bar fault detection method and its application to squirrel-cage asynchronous motors},
journal = {International Journal of Modelling, Identification and Control},
year = {2013},
volume = {19},
number = {1},
pages = {89 -- 97}
}
|
2012 |
| Dai X, Sasloglou K, Atkinson R and Etc. (2012), "Wireless Communication Networks for Gas Turbine Engine Testing", International Journal of Distributed Sensor Networks. Vol. 2012, pp. 1-18. |
| Abstract: A new trend in the field of Aeronautical Engine Health Monitoring is the implementation of wireless sensor networks (WSNs) for data acquisition and condition monitoring to partially replace heavy and complex wiring harnesses, which limit the versatility of the monitoring process as well as creating practical deployment issues. Augmenting wired with wireless technologies will fuel opportunities for reduced cabling, faster sensor and network deployment, increased data acquisition flexibility, and reduced cable maintenance costs. However, embedding wireless technology into an aero engine (even in the ground testing application considered here) presents some very significant challenges, for example, a harsh environment with a complex RF transmission channel, high sensor density, and high data rate. In this paper we discuss the results of the Wireless Data Acquisition in Gas Turbine Engine Testing (WIDAGATE) project, which aimed to design and simulate such a network to estimate network performance and derisk the wireless techniques before the deployment. |
BibTeX:
@article{Dai2012,
author = {Dai, X and Sasloglou, K and Atkinson, R and Etc.},
title = {Wireless Communication Networks for Gas Turbine Engine Testing},
journal = {International Journal of Distributed Sensor Networks},
year = {2012},
volume = {2012},
pages = {1--18},
doi = {10.1155/2012/212876}
}
|
| Dai X, Zhang W, Xu J, Mitchell J and Yang Y (2012), "Kalman interpolation filter for channel estimation of LTE downlink in high-mobility environments", EURASIP Journal on Wireless Communications and Networking. Vol. 2012(1) Springer International Publishing AG. |
BibTeX:
@article{Dai2012a,
author = {Dai, Xuewu and Zhang, Wuxiong and Xu, Jing and Mitchell, JohnE and Yang, Yang},
title = {Kalman interpolation filter for channel estimation of LTE downlink in high-mobility environments},
journal = {EURASIP Journal on Wireless Communications and Networking},
publisher = {Springer International Publishing AG},
year = {2012},
volume = {2012},
number = {1},
doi = {10.1186/1687-1499-2012-232}
}
|
| Dai X, Gao Z, Breikin T and Wang H (2012), "High-Gain Observer-Based Estimation of Parameter Variations With Delay Alignment", IEEE Transactions on Automatic Control. Vol. 57(3), pp. 726-732. |
BibTeX:
@article{Dai2012b,
author = {Dai, Xuewu and Gao, Zhiwei. and Breikin, T. and Wang, Hong},
title = {High-Gain Observer-Based Estimation of Parameter Variations With Delay Alignment},
journal = {IEEE Transactions on Automatic Control},
year = {2012},
volume = {57},
number = {3},
pages = {726--732},
doi = {10.1109/TAC.2011.2169635}
}
|
2009 |
| Dai X, Gao Z, Breikin T and Wang H (2009), "Disturbance Attenuation in Fault Detection of Gas Turbine Engines: A Discrete Robust Observer Design", IEEE Transactions on Systems, Man, and Cybernetics, Part C: Applications and Reviews., mar, 2009. Vol. 39(2), pp. 234-239. |
| Abstract: This study is motivated by the onboard fault detection of gas turbine engines (GTEs), where the computation resources are limited and the disturbance is assumed to be band-limited. A fast Fourier transformation (FFT)-based disturbance frequency estimation approach is proposed and performance indexes are improved by integrating such frequency information. Furthermore, in the left eigenvector assignment, both eigenvalues and free parameters are optimized. As illustrated in the application to the actuator fault detection of a GTE, significant improvements are achieved compared to the existing methods. By combining the frequency estimation and eigenvalue optimization, the main contribution of the paper is the reduction of the computation complexity and the avoidance of the local optimal solution due to fixed eigenvalues. |
BibTeX:
@article{Dai2009,
author = {Dai, Xuewu and Gao, Zhiwei and Breikin, T and Wang, Hong},
title = {Disturbance Attenuation in Fault Detection of Gas Turbine Engines: A Discrete Robust Observer Design},
journal = {IEEE Transactions on Systems, Man, and Cybernetics, Part C: Applications and Reviews},
year = {2009},
volume = {39},
number = {2},
pages = {234--239},
doi = {10.1109/TSMCC.2008.2005845}
}
|
| Dai X, Gao Z, Breikin T and Wang H (2009), "Zero Assignment for Robust H_2/H_infty Fault Detection Filter Design", IEEE Transactions on Signal Processing., apr, 2009. Vol. 57(4), pp. 1363-1372. |
| Abstract: In practical engineering, it is inevitable that a system is perturbed by noise signals. Unfortunately, H infin /H infin filtering may fail to detect some faults when the noise distribution matrix are the same as the fault distribution matrix. In this paper, it is shown that the dynamic feedback gain of a dynamic filter introduces additional zeros to the filter, and both the filter poles and the additional zeros can be assigned arbitrarily. In order to attenuate band-limited noises, the zero assignment technique is used, and an optimal dynamic fault detection filtering approach is proposed by locating the zeros to the noise frequencies and optimizing the poles. Compared to other dynamic filter design approaches, the zero assignment technique gives a better tradeoff between more design freedom and computation costs. As shown in the simulation, a better noise attenuation and fault detection performance have been obtained. The zero assignment in multivariable fault detection filter design would be the main contribution of this paper. |
BibTeX:
@article{Dai2009a,
author = {Dai, Xuewu and Gao, Zhiwei and Breikin, T and Wang, Hong},
title = {Zero Assignment for Robust H_2/H_infty Fault Detection Filter Design},
journal = {IEEE Transactions on Signal Processing},
year = {2009},
volume = {57},
number = {4},
pages = {1363--1372},
doi = {10.1109/TSP.2008.2010598}
}
|
2008 |
| Abou-Zayed U, Gao Z, Dai X and Breikin T (2008), "Parameter Identification for Electromechanical Servo Systems Using a High-gain Observer", In Proceedings of UKACC Int. Conf. on Control'08.
[BibTeX] |
BibTeX:
@inproceedings{Abou-Zayed2008,
author = {Abou-Zayed, Usama and Gao, Zhiwei and Dai, Xuewu and Breikin, Tim},
title = {Parameter Identification for Electromechanical Servo Systems Using a High-gain Observer},
booktitle = {Proceedings of UKACC Int. Conf. on Control'08},
year = {2008}
}
|
| Dai X, Gao Z, Abou-Zayed U and Breikin T (2008), "Time-delay in high-gain observer based disturbance estimation", In Proceedings of the UKACC International Conference on Control 2008. University of Manchester, sep, 2008. |
| Abstract: In this paper, the properties of a high gain observer-based disturbance estimation are analysed, and a time delay calculation approach is proposed for improving the identification of model parameter variation. The focus of this paper is the time delay between the actual disturbance and its estimate in a high gain disturbance estimation observer. It is proved, in this paper, the delay depends on the observer gain, but is independent from the model uncertainties. Thus, a novel algorithm is proposed to calculate the delay according to the phase response of disturbance estimation transfer function. The correctness of this algorithm has been verified by the simulation based on a servo motor model. |
BibTeX:
@inproceedings{Dai2008a,
author = {Dai, X and Gao, Z and Abou-Zayed, U and Breikin, T},
title = {Time-delay in high-gain observer based disturbance estimation},
booktitle = {Proceedings of the UKACC International Conference on Control 2008},
year = {2008},
url = {http://ukacc.group.shef.ac.uk/proceedings/control2008/Proceedings.html#Tu04_02}
}
|
| Dai X, Zou Y, Breikin T and Heath W (2008), "Discrete-time Robust Fault Detection Observer Design: a simulated annealing approach", In Proceedings of the UKACC International Conference on Control 2008. University of Manchester, sep, 2008. |
| Abstract: The robustness in model-based fault detection has received a lot of attention during the last two decades, and RFDO (Robust Fault Detection Observer) forms an important branch of condition monitoring. However, most of current research focuses on continuous-time domain and requires relatively more computation on performance evaluation. In this paper, with the aid of the well-established eigenstructure assignment, a frequency weighted robustness index is proposed for reducing the computation costs and a left-eigenvector assignment method is presented for discrete RFDO design. A simulated annealing algorithm is applied to optimise such an observer. As illustrated in the simulation results, a better disturbance attenuation and fault detection performance have been obtained. Compared to the previous studies, simulated annealing gives the similar results as genetic algorithm, but requires a bit of less computation. |
BibTeX:
@inproceedings{Dai2008b,
author = {Dai, X and Y, Zou and Breikin, T and Heath, W},
title = {Discrete-time Robust Fault Detection Observer Design: a simulated annealing approach},
booktitle = {Proceedings of the UKACC International Conference on Control 2008},
year = {2008},
url = {http://ukacc.group.shef.ac.uk/proceedings/control2008/Proceedings.html#Tu05_01}
}
|
| Dai X, Gao Z, Breikin T and Wang H (2008), "Disturbance Attenuation and Fault Detection Via Zero-Pole Assignment: A Dynamic Observer Approach", In Proceedings of the 17th IFAC World Congress. Seoul, Korea, jul, 2008. Vol. 17(1), pp. 8902-8907. |
| Abstract: In this paper, a zero-pole assignment approach is proposed for disturbance attenuation in dynamic fault detection observer design. The properties of dynamic observers are analysed and it is shown that the poles of a dynamic observer can be shifted and the additional zeros can be assigned arbitrarily. Then, a novel pole-zero assignment approach is proposed and its application to a continuous system is presented. In the simulation, the disturbances are low-frequency signals (<1 textHz), which is more difficult to be attenuated compared to high-frequency disturbances. The dynamic observer shows the capabilities to attenuate such low-frequency disturbances. The zeros assignment in observer design would be the main contribution of this paper. |
BibTeX:
@inproceedings{Dai2008c,
author = {Dai, Xuewu and Gao, Zhiwei and Breikin, Tim and Wang, Hong},
title = {Disturbance Attenuation and Fault Detection Via Zero-Pole Assignment: A Dynamic Observer Approach},
booktitle = {Proceedings of the 17th IFAC World Congress},
year = {2008},
volume = {17},
number = {1},
pages = {8902--8907},
doi = {10.3182/20080706-5-KR-1001.01504}
}
|
| Dai X, Breikin T, Gao Z and Wang H (2008), "Dynamic modelling and Robust Fault Detection of a gas turbine engine", In 2008 American Control Conference. , pp. 2160-2165. |
BibTeX:
@inproceedings{Dai2008d,
author = {Dai, Xuewu and Breikin, Timofei and Gao, Zhiwei and Wang, Hong},
title = {Dynamic modelling and Robust Fault Detection of a gas turbine engine},
booktitle = {2008 American Control Conference},
year = {2008},
pages = {2160--2165},
doi = {10.1109/ACC.2008.4586812}
}
|
| Gao Z, Dai X, Breikin T and Wang H (2008), "High-gain Observer-based Parameter Identification With Application in a Gas Turbine Engine", In Proc. of the 17th IFAC World Congress 2008. Seoul, Korea, jul, 2008. , pp. 1408-1413.
[BibTeX] |
BibTeX:
@inproceedings{Gao2008,
author = {Gao, Zhiwei and Dai, Xuewu and Breikin, Tim and Wang, Hong},
title = {High-gain Observer-based Parameter Identification With Application in a Gas Turbine Engine},
booktitle = {Proc. of the 17th IFAC World Congress 2008},
year = {2008},
pages = {1408--1413}
}
|
2007 |
| Kamalova Z, Breikin T, Dai X and Wang H (2007), "Design of genetic algorithm for on-line reduced-order dynamic modeling of gas turbines", In European Control Conference (ECC) 2007., jul, 2007. , pp. 2642-2647. |
| Abstract: This paper addresses the problem of reduced-order dynamic model parameters' estimation using genetic algorithms (GA). The aim of this work is to select the most suitable type of genetic operators to reduce time of GAs search. Data from real engine are used to investigate the performance of proposed GAs. |
BibTeX:
@inproceedings{Kamalova2007,
author = {Kamalova, Z and Breikin, T and Dai, Xuewu and Wang, Hong},
title = {Design of genetic algorithm for on-line reduced-order dynamic modeling of gas turbines},
booktitle = {European Control Conference (ECC) 2007},
year = {2007},
pages = {2642--2647},
url = {http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=7068418},
doi = {10.23919/ECC.2007.7068418}
}
|
2004 |
| Xuewu D, Grout V, Haokun T and Jianguo L (2004), "Neural Networks-based Multi-Interest Information Filtering" |
BibTeX:
@inproceedings{Xuewu2004,
author = {Xuewu, Dai and Grout, Vic and Haokun, Tang and Jianguo, Li},
title = {Neural Networks-based Multi-Interest Information Filtering},
year = {2004},
url = {https://www.researchgate.net/profile/Vic-Grout/publication/228541736_NEURAL_NETWORKS-BASED_MULTI-INTEREST_INFORMATION_FILTERING/links/0912f50b647f8c10c8000000/NEURAL-NETWORKS-BASED-MULTI-INTEREST-INFORMATION-FILTERING.pdf}
}
|
2008 |
| Xuewu Dai (2008), "Observer-based Parameter Estimation and Fault Detection". Thesis at: University of Manchester. University of Manchester. |
BibTeX:
@phdthesis{XuewuDai2008,
author = {Xuewu Dai},
title = {Observer-based Parameter Estimation and Fault Detection},
publisher = {University of Manchester},
school = {University of Manchester},
year = {2008}
}
|
| Dai X, Breikin T, Gao Z and Wang H (2008), "Disturbance Attenuation and Fault Detection via Zero-pole Assignment: a Dynamic Observer Approach (Presentation Slides)". Thesis at: University of Manchester.
[BibTeX] |
BibTeX:
@techreport{Dai2008,
author = {Dai, X and Breikin, T and Gao, Z and Wang, H},
title = {Disturbance Attenuation and Fault Detection via Zero-pole Assignment: a Dynamic Observer Approach (Presentation Slides)},
school = {University of Manchester},
year = {2008}
}
|
2017 |
| Dai X, Gao S, Pan K, Zhu J and Rashvand HF (2017), "Wireless piezoelectric sensor systems for defect detection and localization", In Wireless Sensor Systems for Extreme Environments: Space, Underwater, Underground and Industrial. , pp. 201-219. Wiley.
[BibTeX] |
BibTeX:
@incollection{Dai2017,
author = {Dai, Xuewu and Gao, Shang and Pan, Kewen and Zhu, Jiwen and Rashvand, Habib F},
title = {Wireless piezoelectric sensor systems for defect detection and localization},
booktitle = {Wireless Sensor Systems for Extreme Environments: Space, Underwater, Underground and Industrial},
publisher = {Wiley},
year = {2017},
pages = {201--219}
}
|
2013 |
| Dai X and Qin F (2013), "Rapid BeagleBoard Prototyping with MATLAB and Simulink" Packt Publishing Ltd. |
| Abstract: Written for students and researchers, Rapid BeagleBoard Prototyping with MATLAB and Simulink is a hands-on guide that provides a number of exercises and gives readers grounding in rapid prototyping techniques for audio/video applications. The book presents how to apply rapid BeagleBoard prototyping techniques to audio/video applications without intensive manual low-level coding. Topics include introducing BeagleBoard, C/C++ development with Eclipse on Windows, and automatic code generation. MATLAB, Simulink, and MATLAB Coder are used to solve examples in the book. Also included is a chapter about generating code from MATLAB and BeagleBoard support from Simulink. |
BibTeX:
@book{Dai2013a,
author = {Dai, Xuewu and Qin, Fei},
editor = {Dai, Xuewu and Qin, Fei},
title = {Rapid BeagleBoard Prototyping with MATLAB and Simulink},
publisher = {Packt Publishing Ltd},
year = {2013},
url = {http://www.mathworks.co.uk/support/books/book86617.html?category=new&language=-1}
}
|