Denoising strategy for convolutionally-coded bidirectional relaying

  • Authors:
  • Toshiaki Koike-Akino;Petar Popovski;Vahid Tarokh

  • Affiliations:
  • School of Engineering and Applied Sciences, Harvard University, Cambridge, MA;Department of Electronic Systems, Aalborg University, Aalborg, Denmark;School of Engineering and Applied Sciences, Harvard University, Cambridge, MA

  • Venue:
  • ICC'09 Proceedings of the 2009 IEEE international conference on Communications
  • Year:
  • 2009

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Abstract

In this paper, we present a forwarding strategy for two-stage bidirectional relaying in which trellis-coded modulation (TCM) is employed. We reveal that adaptive network coding cannot resolve distance shortening occurred at specific channel conditions when a certain TCM is used. To overcome this issue, we introduce an improved amplify-and-forward (AF) scheme termed pseudo AF (PAF). The proposed strategy adaptively switches network coding and PAF according to the channel information. Computer simulations demonstrate that the proposed approach can improve throughput performance.