North Jersey VTS/Stevens Seminar: Cross-Layer Optimization for Wireless Systems

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North Jersey VTS/Stevens ECE Seminar:
Cross-Layer Optimization for Wireless Systems
Prof. Li-Chun Wang
Department of Communication Engineering
National Chiao-Tung University
Taiwan

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Cross-Layer Optimization for Wireless Systems

Speaker:

Prof. Li-Chun Wang

Department of Communication Engineering

National Chiao-Tung University

Taiwan

Time: 3PM - 4PM, Wednesday April 14, 2010

Location: Babbio Center 221

Abstract:

In the first part of this talk, from the standpoint MAC layer to PHY layer, we introduce the concept of "soft coverage" in MU-MIMO cellular mobile systems. Specifically, the MAC layer multi-user scheduling algorithm is designed to improve the coverage of MIMO cellular mobile systems without increasing transmission power in the PHY layer. Next, we show that the multi-user scheduling algorithm can also simplify the design of MIMO receiver as well. It will be demonstrated that a simple zero-forcing MIMO receiver combined with appropriate multi-user scheduling algorithm can achieve the performance of the optimal MIMO receiver.

In the second part of this talk, from the viewpoint of PHY layer to higher protocol layer, we first discuss how radio propagation channels affect the design of rate adaptation schemes of WLAN. Specifically, we show that it is not necessary to adopt the complete eight modulation and coding (MCS) modes specified in IEEE 802.11 WLAN for various transmission rates in a Rayleigh fading fading.

Bio Sketch

Li-Chun Wang (S-92, M-96, SM-06) received a B.S. degree in electrical engineering from the National Chiao-Tung University, Hsinchu, Taiwan, in 1986; the M.S. degree in electrical engineering from the National Taiwan University, Taipei, Taiwan, in 1988; and an M.Sc. and Ph.D. degrees in electrical engineering from Georgia Institute of Technology, Atlanta, in 1995 and 1996, respectively.From 1990 to 1992, he was with Chunghwa Telecom. In 1995, he was affiliated with Northern Telecom in Richardson, Texas. From 1996 to 2000, he was with AT&T Laboratories, where he was a Senior Technical Staff Member in the Wireless Communications Research Department. In August 2000, he joined the Department of Communication Engineering of National Chiao-Tung University in Taiwan as an associate professor and has been a full professor since August 2005. Dr. Wang was a co-recipient of the Jack Neubauer Best Paper Award from IEEE VTS in 1997. His current research interests are in the areas of cellular architectures, radio network resource management, cross-layer optimization for cooperative and cognitive wireless networks. He is the holder of eight U.S. patents with three more pending.

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