Sequential pre-coding for MIMO hybrid ARQ

Authors:
Jin W. Kim;Byung J. Kwak;Dong S. Kwon;Chung G. Kang
Affiliations:
Department of Electrical Engineering, Korea University, Seoul, Korea;Electronics and Telecommunications Research Institute, Daejeon, Korea;Electronics and Telecommunications Research Institute, Daejeon, Korea;Department of Electrical Engineering, Korea University, Seoul, Korea
Venue:
IEEE Communications Letters
Year:
2010

Citing 4
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Abstract

While the conventional codebook is defined only for the initial transmission in the closed-loop MIMO system, this paper proposes a new retransmission structure with a sequence of multiple codebooks, rather than using a single identical codebook for every retransmission. The pre-coding matrices in each code book are sequentially linked so that each one can be used for a sequential hybrid ARQ transmission attempt, without invoking any index feedback from the receiver. It has been shown that the proposed codebook structure provides a performance gain of more than 5dB over the conventional scheme in the longtermstatic channel.