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MIMO ARQ with multibit feedback: Outage analysis
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0001-7182-9543
2012 (English)In: IEEE Transactions on Information Theory, ISSN 0018-9448, Vol. 58, no 2, 765-779 p.Article in journal (Refereed) Published
Abstract [en]

This paper studies the asymptotic outage performance of incremental redundancy automatic-repeat-request (INR-ARQ) transmission over multiple-input multiple-output (MIMO) block-fading channels with discrete input constellations. We first show that transmission with random codes using a discrete signal constellation across all transmit antennas achieves the optimal outage diversity given by the Singleton bound. The optimal SNR-exponent and outage diversity of INR-ARQ transmission over the MIMO block-fading channel are then analysed. We show that a significant gain in outage diversity is obtained by providing more than one bit feedback at each ARQ round. Thus, the outage performance of INR-ARQ transmission can be remarkably improved with minimal additional overhead. A practical feedback-and-power-adaptation rule is proposed for MIMO INR-ARQ, demonstrating the benefits provided by multibit feedback. Although the rule is sub-optimal in terms of outage performance, it achieves the optimal outage diversity.

Place, publisher, year, edition, pages
2012. Vol. 58, no 2, 765-779 p.
Keyword [en]
Automatic-repeat-request, Multibit feedback, Outage diversity, Outage probability, Power allocation, SNR-exponent, Automatic repeat request, Multi-bit feedback, Power allocations, Fading channels, MIMO systems, Optimization
National Category
URN: urn:nbn:se:kth:diva-97797DOI: 10.1109/TIT.2011.2170919ISI: 000300246900018ScopusID: 2-s2.0-84856818544OAI: diva2:533775
Swedish Research Council, 621-2009-4666EU, European Research Council, 228044ICT - The Next Generation

QC 20120614

Available from: 2012-06-14 Created: 2012-06-14 Last updated: 2013-04-11Bibliographically approved

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Kildehöj Rasmussen, Lars
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