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Feedback Scheme for STBC-Spatial Multiplexing OFDM System with outdated channel feedback  

Lim Jong-Kyoung (Graduate school of Information Technology & Telecommunication, Inha University)
Hwang Hyeon-Chyeol (Graduate school of Information Technology & Telecommunication, Inha University)
Seo Myoung-Seok (Graduate school, Inha University)
Kwak Kyung-Sup (Graduate school of Information Technology & Telecommunication, Inha University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.4, 2006 , pp. 31-38 More about this Journal
Abstract
In this paper, we propose an efficient preceding scheme for STBC-Spatial Muiltiplexing OFDM systems. In MIMO systems, the precoder is designed on the assumption that feedback channel information is perfectly known to transmitter and receiver. However, feedback delay and link errors in real environment make the transmitter use the incorrect channel information and consequently cause the performance degradation. The proposed precoder is designed to compensate for the performance degradation by the diversity gain provided by STBC. At the transmitter, the precoder for each subcarrier is constructed by using the index of codebook, subcarrier correlation, and auto correlation of channel. From the simulation results, STBC-spatial multiplexing OFDM outperforms the preceded-spatial multiplexing OFDM at $SER=10^{-3}$ when the Doppler frequency is greater than 60Hz.
Keywords
STBC-OFDM; Spatial multiplexing; precoder; outdated feedback;
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