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Symbol Based Rate Adaptation in Coded MIMO-OFDM Systems  

Sung, Chang-Kyung (삼성전자)
Kim, Ji-Hoon (고려대학교 전기전자전파공학부 무선통신연구실)
Lee, In-Kyu (고려대학교 전기전자전파공학부 무선통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.1A, 2008 , pp. 50-58 More about this Journal
Abstract
The use of space-division multiple access(SDMA) in the downlink of multiuser multi-input/multi-output(MIMO) wireless transmission systems can provide substantial gains in system throughput. When the channel state information(CSI) is available at the transmitter, a considerable performance improvement can be attained by adapting the transmission rates to the reported CSI. In addition, to combat frequency selective fadings in wideband wireless channels, bit-interleaved coded OFDM(BIC-OFDM) modulation schemes are employed to provide reliable packet delivery by utilizing frequency diversity through channel coding. In this paper, we propose an adaptive modulation and coding(AMC) scheme combined with an opportunistic scheduling technique for the MIMO BIC-OFDM with bandwidth-limited feedback channels. The proposed scheme enhances the link performance by exploiting both the frequency diversity and the multiuser diversity. To reduce the feedback information, the proposed AMC scheme employs rate adaptation methods based on an OFDM symbol rather than on the whole subchannels. Simulation results show that the proposed scheme exhibits a substantial performance gain with a reasonable complexity over single antenna systems.
Keywords
Adaptive Modulation and Coding(AMC); Multi-Input Multi-Output(MIMO); Orthogonal Frequency Division Multiplexing(OFDM); Sapce Division Multiple Access(SDMA) and Dounlink;
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