Linear Precoding Based on Sub-Channel Permutation in Post-Combining MIMO-HARQ Systems

Jinxia CHENG  Chi LIU  Shidong ZHOU  Ming ZHAO  Yan YAO  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.11   pp.3139-3142
Publication Date: 2006/11/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.11.3139
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
MIMO,  HARQ,  linear precoding,  MMSE,  ZF,  channel state information,  

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A powerful HARQ-based linear precoding scheme is proposed to utilize the flexibility of post-combining HARQ strategy in MIMO communications systems. The scheme selects the appropriate symbols and transmit powers for each eigen-mode to acquire more performance gains. Simulation results show that the proposed scheme achieves about 5.5 dB signal-to-noise ratio gains over original spatial multiplexing scheme at an average bit error rate of 10-4. Furthermore, the gap between the two schemes increases with the number of transmissions.