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From Physical Layer to Cooperation Techniques for Future Wireless Networks: An Overview

Speaker:      Prof. Geoffrey Ye Li

School of ECE, Georgia Institute of Technology

Time:           10:00-11:30am, March 16 (Wednesday)

Venue:        Seminar Room 215, Xindian Building

Abstract:

In this talk, we give an overview of techniques for broadband wireless communications with emphasis on our own contribution in the related areas. We first introduce orthogonal frequency division multiplexing (OFDM) to deal with the delay spreads of broadband wireless channels. We then briefly present multiple-input multiple-output (MIMO) techniques for spatial diversity and multiplexing. Turbo coding, invented over 10 years ago, almost reaches Shannon capacity. Similar to the principle of turbo coding, we have found that turbo techniques are in general very effective in wireless transceiver design and have invented a technique that approaches the matched filter bound (MFB). To efficiently use limited wireless resources, cooperation among difference users and among different networks is very important. By exploiting diverse channel states and types of traffic of different users and performing joint optimization of physical and multiple access control (MAC) layers, quality-of-service (QoS) and fairness of a wireless network can be significantly improved. Cognitive radio can be regarded as cooperation among different networks and is another means for spectrum efficiency improvement.  At the end of the talk, we present our view on some critical research areas to further improve the performance of broadband wireless transmission.

Biography:

GEOFFREY YE LI received his B.S.E. and M.S.E. degrees in 1983 and 1986, respectively, from the Department of Wireless Engineering, Nanjing Institute of Technology, Nanjing, China, and his Ph.D. degree in 1994 from the Department of Electrical Engineering, Auburn University, Alabama.

He was a Teaching Assistant and then a Lecturer with Southeast University, Nanjing, China, from 1986 to 1991, a Research and Teaching Assistant with Auburn University, Alabama, from 1991 to 1994, and a Post-Doctoral Research Associate with the University of Maryland at College Park, Maryland, from 1994 to 1996. He was with AT&T Labs - Research at Red Bank, New Jersey, as a Senior and then a Principal Technical Staff Member from 1996 to 2000. Since 2000, he has been with the School of Electrical and Computer Engineering at Georgia Institute of Technology as an Associate and then a Full Professor. He is also holding the Cheung Kong Scholar title at the University of Electronic Science and Technology of China since March 2006. 

His general research interests include statistical signal processing and telecommunications, with emphasis on OFDM and MIMO techniques, cross-layer optimization, and signal processing issues in cognitive radios. In these areas, he has published over 200 papers in refereed journals or conferences and two books, 20 of which are with over 100 Google citations. He has over 20 patents granted or filed. He once served or is currently serving as an editor, a member of editorial board, and a guest editor for over 10 technical journals. He organized and chaired many international conferences, including technical program vice-chair of IEEE ICC’03 and co-chair of IEEE SPARC’11. He has been awarded an IEEE Fellow for his contributions to signal processing for wireless communications since 2006, selected as a Distinguished Lecturer for 2009 - 2010 by IEEE Communications Society, and won 2010 IEEE Communications Society Stephen O. Rice Prize Paper Award in the field of communications theory.