中国科学技术大学研究生教育创新研究计划——高水平学术前沿讲座

报告题目： Improving Performance in Multiband OFDM Ultra Wideband Communication System

报告人： Professor Xiaodong Chen

The School of Electronic Engineering and Computer Science

Queen Mary, University of London, UK

报告时间：7月22日上午10点30分

报告地点：电三楼314室六系大会议室

主办单位：中国科大研究生院、电子工程与信息科学系

Abstract:

The Federal Communication Commission (FCC) introduced and defined the spectral mask for UWB systems in 2002, and in 2004, the WiMedia group proposed the Multiband Orthogonal Frequency Division Multiplex Ultra Wideband (MB‐OFDM UWB) Model with target of delivering a data rate of 480Mbps over 3 metres. With an enormous bandwidth, UWB ought to have delivered the highest data rate in wireless technology but eight years after introducing UWB technology for PAN communication, no existing commercial UWB product can deliver the proposed specification. This raised some questions over UWB technology; why it has not fulfilled its promise and whether it can still fulfil the proposed data rate of 480Mbps over 3 metres. On the other hand, Wireless Local Area network (WLAN) has introduced Multiple Input Multiple Output (MIMO) technology into its systems and it’s able to achieve a data rate of up to 1Gbps. This raises another question on the fate of UWB technology if no improvement is done on the current technology. It is obvious that more research needs to be done on UWB communication technology with the goal of improving the system performance within the constraints placed on it.

This report will address to the reason why UWB technology has failed to realise its potential by carrying out detailed analysis of the MB‐OFDM UWB technology and to seek ways of solving the technical problems. Detailed system analysis was carried out on the UWB technology using current UWB products in the market and a MB‐OFDM UWB Evaluation kit. Two approaches to improve the MB-OFDM UWB system have been proposed and some preliminary studies were carried out at Queen Mary, University of London.

Biography:

Xiaodong Chen received the degree of B.Eng. in Electronic Physics from the University of Zhejiang, Hangzhou, China in 1983, and the degree of Ph.D. in Microwave Electronics from the University of Electronic Science and Technology of China, Chengdu in 1988.

In September 1988 he joined the Department of Electronic Engineering at King's College, University of London, as a Postdoctoral Visiting Fellow. In September 1990 he was employed by the King’s College London as a Research Fellow. In March 1996 he was appointed to an EEV Lectureship at King's College London. In September 1999 He joined the Department of Electronic Engineering at Queen Mary and Westfield College, University of London. He was promoted to a Reader in the same College in September 2003. In October 2006, he was appointed to a full Professorship of Microwave Engineering at Queen Mary, University of London. Professor Xiaodong Chen is also the Director of Graduate Studies in School of Electronic Engineering and Computer Science, Queen Mary, University of London.

His research interests are in THz generators and antennas, wireless communications and bioelectromagnetics and he has over 300 publications (book chapters, journal papers and refereed conference presentations). He has been worked on various high THz devices and quasi-optical systems, including micro-machined klystrons and backward wave oscillators, nonlinear operated klystrons and dichroics and compact antenna test ranges in THz range.

He was invited to give keynote/invited presentations in a number of international conferences and has served as Co-Chairmen in China-UK/Europe Workshop on Millimetre Wave and THz Technologies, 2008 (Chengdu, China), 2009 (Oxford, UK) and 2010(Beijing, China), 2011(Glasgow, UK), International Workshop on Antennas Technologies, 2007 (Cambridge), IEE International Symposium on Ultra Wide Band Radios and Antennas, 2004 (London), Co-Chairmen in IEE/IoP/IPEM International Workshop on RF Interaction with Humans, 2003 (London), 2005 (Glasgow) and 2008 (Bath), Executive Chairman in IEEE International Conference on Telecommunications (ICT)’2002 (Beijing).  He is currently a member of UK EPSRC Review College and a Senior Member of IEEE.

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