MIMO ARQ systems with multi-level feedback

Authors:
Khoa D. Nguyen;Lars K. Rasmussen;Albert Guillén i Fàbregas;Nick Letzepis
Affiliations:
Inst. for Telecom. Research, University of South Australia, SA, Australia;Inst. for Telecom. Research, University of South Australia, SA, Australia and Communication Theory Lab, Royal Institute of Technology, Stockholm, Sweden;Department of Engineering, University of Cambridge, Cambridge, UK;Inst. for Telecom. Research, University of South Australia, SA, Australia
Venue:
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 1
Year:
2009

Citing 6
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Abstract

We consider improving the outage performance of incremental-redundancy automatic repeat request (INR-ARQ) transmission over the multiple-input multiple-output (MIMO) block-fading channel by allowing multi-bit receiver feedback. We show that multi-bit feedback offers significant gain in outage diversity when power adaptation is employed. A suboptimal feedback and power adaptation rule is proposed, illustrating the benefits provided by multi-bit feedback.