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Hybrid ARQ transmission and combining for MIMO systems

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4 Author(s)
Onggosanusi, Eko N. ; Mobile Wireless Branch DSPS R&D Center, Texas Instrum. Inc., Dallas, TX, USA ; Dabak, A.G. ; Yan Hui ; Gibong Jeong

In this paper, we investigate several possibilities to increase the efficiency of hybrid automatic retransmission request (HARQ) for multi-input multi-output (MIMO) systems. At the receiver side, two HARQ combining schemes, namely pre-combining and post-combining, are discussed and analyzed. We show that pre-combining is superior to post-combining. In addition, we propose a transmission technique, termed the basis hopping, which improves the HARQ diversity gain especially in slow fading channels. We demonstrate that the use of pre-combining in conjunction with the proposed basis hopping technique provides dramatic gain over a simplistic application of HARQ scheme for MIMO.

Published in:

Communications, 2003. ICC '03. IEEE International Conference on  (Volume:5 )

Date of Conference:

11-15 May 2003