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Analysis of Network Coded HARQ for Multiple Unicast Flows
KTH, School of Electrical Engineering (EES), Communication Theory. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
2013 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 61, no 2, 722-732 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, we consider network coded (NCed) Hybrid-ARQ (HARQ) for multiple unicast flows. The main contribution of the paper is the derivation of throughput expressions for NCed HARQ with arbitrary number of users in identical i.i.d. channels amid packets for all users. We apply the result to Rayleigh fading channels and two packet combining schemes: incremental redundancy (IR) and chase combining (CC). We verify the analytical results with simulations and observe substantial SNR improvements over NCed ARQ and HARQ. The SNR gains in the moderate/high and low throughput regimes are mainly due to network coding and packet combining, respectively. For low/moderate SNRs, NCed HARQ with IR surpasses the CC performance. In addition, we introduce a novel re-transmission strategy that makes the network coding more efficient at low SNR.

Place, publisher, year, edition, pages
2013. Vol. 61, no 2, 722-732 p.
Keyword [en]
Network coding, automatic repeat request (ARQ), cooperative systems, Rayleigh channels
National Category
Communication Systems
URN: urn:nbn:se:kth:diva-120561DOI: 10.1109/TCOMM.2012.121112.110202ISI: 000316204300027ScopusID: 2-s2.0-84874949920OAI: diva2:615812
Swedish Research Council

QC 20130412

Available from: 2013-04-12 Created: 2013-04-11 Last updated: 2013-04-12Bibliographically approved

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