Analysis of network coded HARQ for multiple unicast flows

Journal Article (Journal Article)

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. © 1972-2012 IEEE.

Full Text

Duke Authors

Cited Authors

  • Larsson, P; Smida, B; Koike-Akino, T; Tarokh, V

Published Date

  • January 14, 2013

Published In

Volume / Issue

  • 61 / 2

Start / End Page

  • 722 - 732

International Standard Serial Number (ISSN)

  • 0090-6778

Digital Object Identifier (DOI)

  • 10.1109/TCOMM.2012.121112.110202

Citation Source

  • Scopus