AT TOP	Paper 429	US-M-A	DOWN
Bandwidth-Efficient Coded Cooperative Relaying in Wireless Networks
Kim,Sang		Iowa State University
We present a bandwidth-efficient coded cooperative relaying technique that provides a significant coding gain without requiring an increase in bandwidth} relative to uncoded cooperative relaying system. The key to the technique is that the redundant bits introduced by the code are accommodated by expanding the relay set, rather than expanding the signal set as in traditional trellis coded modulation. An increase in the number of relays produces additional interference, but its effect can be suppressed by signal processing (decorrelation) and channel coding techniques to produce a positive coding gain without sacrificing data rate or expanding bandwidth. We present the optimum number of relays and the optimal code rate that minimize the end-to-end bit error probability as well as the coding gain over uncoded cooperative relaying system.
Sang Wu Kim (M’88–SM’99) received the B.S. degree from Yonsei University, Seoul, Korea, in 1981, the M.S. degree from the Korea Advanced Institute of Science and Technology (KAIST), Daejon, Korea, in 1983, and the Ph.D. degree from the University of Michigan, Ann Arbor, in 1987, all in electrical engineering. He is currently an Associate Professor with the Department of Electrical and Computer Engineering, Iowa State University, Ames. Previously, he held teaching and research positions at KAIST, the California Institute of Technology, and AT&T Labs-Research. His research interests are primarily in the areas of wireless communications with emphasis in code-division multiple access, error-correction coding, multiple input multiple output, space–time coding, multiuser detection, adaptive modulation and coding, cooperative communications, and sensor networks. Dr. Kim is currently an Associate Editor of the IEEE COMMUNICATIONS LETTERS. He was awarded Best Paper Awards at the IEEE International Symposium on Spread Spectrum Techniques and Applications, September 2000, and the IEEE International Conference on Mobile Ad-hoc and Sensor Systems, November 2005. In March 2003, he was listed in Marquis’ Who’s Who in Science and Engineering.