Li-Chun Wang

Associate Professor of Communication Engineering

National Chiao Tung University, Taiwan

Scheduling for MIMO Wireless Data Networks

Both scheduling and multi-input-multi-output (MIMO) antenna techniques have attracted a lot of interest in the wireless community recently. On the one hand, wireless scheduling techniques can exploit a new type of diversity -- multiuser diversity -- to improve the spectral efficiency of wireless data networks. On the other hand, multiple transmit and receive antennas are an important means to increase either the diversity of combating channel fading or the degrees of freedom for communications (i.e., capacity). This talk introduces a new concept of virtual antennas and provides a unified point of view that all types of gains -- multi-user diversity, multi-antenna diversity, and the spatial multiplexing - can be simultaneously obtained.

By exploring the synergy of combining scheduling with the MIMO antenna technique, we suggest a feasible cross-layer performance improvement methodology to enhance both the coverage and capacity performances for wireless data networks.

Dr. Li-Chun Wang received his B.S. degree from National Chiao Tung University , Taiwan, R. O. C. in 1986, the M.S. degree from National Taiwan University in 1988, and the Ms. Sci. and Ph. D. degrees from the Georgia Institute of Technology , Atlanta, in 1995, and 1996, respectively, all in electrical engineering. From 1990 to 1992, he was with the Telecommunications Laboratories of the Ministry of Transportations and Communications in Taiwan (currently the Telecom Labs of Chunghwa Telecom Co.). In 1995, he was affiliated with Bell Northern Research of Northern Telecom, Inc., Richardson, TX. From 1996 to 2000, he was with AT&T Laboratories, where he was a Senior Technical Staff Member in the Wireless Communications Research Department. Since August 2000, he has been an Associate Professor in the Department of Communication Engineering of National Chiao Tung University in Taiwan. His current research interests are in the areas of cellular architectures, radio resource management, and propagation channel modeling. Specific topics include hierarchical cellular architectures, network issues for MIMO systems and cross-layer optimization for adaptive wireless networks. Dr. Wang was a co-recipient (with Gordon L. Stuer and Chin-Tau Lea) of the 1997 IEEE Jack Neubauer Best Paper Award from the IEEE Vehicular Technology Society. He is an associate editor for the IEEE Transactions on Wireless Communications and holding three US patents.