Space-frequency-coded MIMO OFDM receivers based on Gaussian message passing

Authors:
Chia-Peng Chou;Chien-Hsing Wu;Tsung-Hsien Liu;Yin-Tsung Hwang
Affiliations:
Communication Engineering Department, National Chung-Cheng University, Chia-Yi, Taiwan, R.O.C.;Communication Engineering Department, National Chung-Cheng University, Chia-Yi, Taiwan, R.O.C.;Communication Engineering Department, National Chung-Cheng University, Chia-Yi, Taiwan, R.O.C.;Electrical Engineering Department, National Chung-Hsing University, Taichung, Taiwan, R.O.C.
Venue:
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Year:
2009

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Abstract

Forney-style factor graphs are used for modeling space-frequency-coded MIMO OFDM systems over frequency-selective fading channels. We analyze the Gaussian message passing mechanism for the Alamouti scheme and linear transformation of the factor graph. A new decision rule is derived in terms of the mean vector and covariance matrix of modulation symbols. We employ the K-best algorithm with reduced complexity to justify the effectiveness of our receiver.