应光电国家实验室光通信与智能网络研究部的邀请，美国德州农机大学（A&M）崔曙光教授将于7月21日来作学术报告。欢迎感兴趣的老师和同学踊跃参加！

TITLE：Beamforming Optimization for a Two-Way Relay Channel via SDP Relaxatio

TIME：2009年7月21日下午2：30 ------July 21st 2：30pm

ROOM：光电国家实验室 A202

Speaker: Dr. Shuguang Cui

Abstract:

We study the wireless two-way relay channel (TWRC), where two source nodes, S1 and S2, exchange information through an assisting relay node, R. It is assumed that R receives the sum signal from S1 and S2 in one time-slot, and then amplifies and forwards the received signal to both S1 and S2 in the next time-slot. By applying the principle of analogue network coding (ANC), each of S1 and S2 cancels the so-called “self-interference” in the received signal from R and then decodes the desired message. Assuming that S1 and S2 are each equipped with a single antenna and R with multi-antennas, we analyze the capacity region of the ANC-based TWRC with linear processing (beamforming) at R via convex optimization techniques. The capacity region contains all the achievable bidirectional rate-pairs of S1 and S2 under the given transmit power constraints at S1, S2, and R. We derive the relay beamforming structure by solving a non-convex problem via SDP relaxation, and show that the relaxed solution is exactly optimal for the original non-convex problem.

Biology:

Shuguang Cui received his Ph.D in Electrical Engineering from Stanford University, California, USA, in 2005, M.Eng in Electrical Engineering from McMaster University, Hamilton, Canada, in 2000, and B.Eng. in Radio Engineering with the highest distinction from Beijing University of Posts and Telecommunications, Beijing, China, in 1997. He is now working as an assistant professor in Electrical and Computer Engineering at the Texas A&M University, College Station, TX. His current research interests include resource allocation for constrained networks, network information theory, statistical signal processing, and general communication theories. He was a recipient of the NSERC graduate fellowship from the National Science and Engineering Research Council of Canada and the Canadian Wireless Telecommunications Association (CWTA) graduate scholarship. He has been serving as the TPC co-chairs for the 2007 IEEE Communication Theory Workshop, the ICC'08 Communication Theory Symposium, and the GLOBECOM'10 Communication Theory Symposium. He has also been serving as the associate editors for the IEEE Communication Letters and IEEE Transactions on Vehicular Technology, and the elected member for IEEE Signal Processing Society SPCOM Technical Committee.