Rate-split based decode-and-forward protocols for cooperative communications

Francis Lu*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

In this paper we first establish a general performance upper bound on the diversity-multiplexing tradeoff (DMT) for communication protocols for a half-duplex cooperative network where every node has a single antenna. This bound shows that the dynamic-decode-and-forward (DDF) protocol achieves optimal DMT among all variations of decode-and-forward based protocols when multiplexing gain r ≤ 1 over 2. Secondly, when r > 1 over 2 it shows that the diversity gain must be less than 1 for all protocols and for any number of relay nodes. Our bound also implies that the well-known cut-set-based DMT upper bound is not tight except for the single-relay network and that there are rooms to improve the performance of DDF protocol, thereby settling a long-time open question raised by Azarian et al.. In light of this breakthrough, a novel protocol based on a rate-split is proposed in this paper. Two variations, dynamic and non-dynamic, of the rate-split-based protocol are also presented. It is shown that the dynamic version achieves a DMT better than the DDF protocol, and in particular, meets the cut-set bound in the case of a single-relay network. The other variation, i.e., the non-dynamic one, has a much simpler implementation and reaches its optimal performance in only two channel uses. Moreover, it meets the cut-set bound in the case of a single-relay network.

Original languageEnglish
Title of host publication7th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages103-107
Number of pages5
ISBN (Electronic)9781467383080
DOIs
StatePublished - 22 Apr 2016
Event7th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2015 - Bengaluru, India
Duration: 13 Sep 201518 Sep 2015

Publication series

Name7th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2015

Conference

Conference7th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2015
CountryIndia
CityBengaluru
Period13/09/1518/09/15

Keywords

  • Cooperative communications
  • decode-and-forward
  • DMT
  • rate-split

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