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Presenter: Dr. Wei Xu - Associate Professor, National Mobile Communications Research Laboratory (NCRL), Southeast University, China
Supervisor: Dr. Xiaodai Dong

Date: Thu, September 18, 2014
Time: 11:00:00 - 12:00:00
Place: EOW 430

ABSTRACT

Abstract:

With the rapidly increasing demand for high-speed data transmission and a growing number of terminals in one cell, massive multiple-input multiple-output (MIMO) has been shown promising owing to its high spectrum efficiency. Although massive MIMO can efficiently improve the system performance, usage of orthogonal pilots and growing terminals cause large resource consumption especially when the coherence interval is short. This paper presents a semi-orthogonal pilot design with simultaneous data and pilot transmission. In the proposed technique, we exploit the asymptotic channel orthogonality in massive MIMO systems, with which the mutual interference between data and pilot can be mitigated by successive interference cancellation (SIC). Theoretical analysis and simulation results show that the proposed pilot design can achieve a significant performance improvement with reduced pilot resource consumption compared with the popular orthogonal pilots.

Biography:

Wei Xu received his B.Sc. degree in electrical engineering in 2003 and his M.S. and Ph.D. degrees in communication and information engineering in 2006 and 2009, respectively, all from Southeast University, Nanjing, China. He is currently an Associate Professor at the National Mobile Communications Research Laboratory (NCRL), Southeast University. Between 2009 and 2010, he was a postdoctoral research fellow with the Department of Electrical and Computer Engineering, University of Victoria, Canada. Dr. Xu is an Editor for the IEEE COMMUNICATIONS LETTERS. He has been involved in Technical Program Committees for a number of international conferences including the IEEE Global Communications Conference (Globecom), the IEEE Wireless Communications and Networking Conference (WCNC), the IEEE Vehicular Technology Conference (VTC), etc. He has co-authored more than 80 papers and has four patents granted. He is the co-recipient of the Best Paper Award at the IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies for Wireless Communications. He was elected Core Team Member of the Jiangsu Innovation Team in 2012. His research interests include communication theory, cooperative communications, and signal processing and optimization theory for wireless communications.