Linear precoder optimization for ARQ packet retransmissions in centralized multiuser MIMO uplinks
Zhihua Shi
Haitong Sun
Chunming Zhao
Zhi Ding
Southeast Univ., Nanjing;
This paper appears in: Wireless Communications, IEEE Transactions on
Publication Date: February 2008
Volume: 7,
Issue: 2
On page(s): 736-745
ISSN: 1536-1276
INSPEC Accession Number: 9836329
Digital Object Identifier: 10.1109/TWC.2008.060662
Current Version Published: 2008-02-15
Abstract
We investigate the joint optimization of automatic repeat request (ARQ) and MIMO diversity for multi-user wireless communication systems. Exploiting MIMO for diversity gain and ARQ for error correction, our goal is to better integrate MIMO and ARQ in the transceivers to improve multi-user uplink performance. Specifically, we design optimal linear precoders for ARQ retransmissions by multiple wireless uplink terminals equipped with MIMO transmitters and we rely on joint detection of multiple retransmissions at the receivers. To better utilize ARQ diversity, we derive a set of progressive linear ARQ precoders for flat fading multiple-access channels based on the criterion of maximizing the mutual information of multiuser (re)-transmissions. We propose two efficient iterative numerical algorithms to determine the optimal precoders.
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