Adaptive two-way relaying and outage analysis

Qiang Li, See Ho Ting, Ashish Pandharipande, Yang Han

Research output: Contribution to journalArticleAcademicpeer-review

132 Citations (Scopus)


This paper analyzes the outage performance of cooperative protocols for the two-way relaying model in which a half-duplex relay assists in the bi-directional communication of two terminals. We first define the outage events and derive closed form results for the outage probabilities of conventional nonadaptive Amplify-and-Forward (AF) and Decode-and-Forward (DF) two-way relaying protocols.We then consider a simple adaptive protocol in the two-way relaying scenario, which switches between AF and DF depending on the decodability of the two bi-directional data streams at the relay. We also derive the outage probability for this adaptive scheme in closed form expressions, and our results show that it always outperforms the non-adaptive schemes. All the closed form results derived in this paper are applicable to arbitrary channel gains between terminals.

Original languageEnglish
Article number5090009
Pages (from-to)3288-3299
Number of pages12
JournalIEEE Transactions on Wireless Communications
Issue number6
Publication statusPublished - Jun 2009

Bibliographical note

Funding Information:
Manuscript received September 9, 2008; revised January 7, 2009 and March 17, 2009; accepted March 22, 2009. The associate editor coordinating the review of this paper and approving it for publication was H. Dai. Q. Li, S. H. Ting, and Y. Han are with the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798 (e-mail: {liqi0008, shting, hany0008} A. Pandharipande is with Philips Research Europe - Eindhoven, High Tech Campus, 5656 AE Eindhoven, Netherlands (e-mail: This work was partly supported by the Singapore Ministry of Education Academic Research Fund Tier 1, RG74/07. Digital Object Identifier 10.1109/TWC.2009.081213


  • Amplify-and-forward
  • Bi-directiona l
  • Decode-and-forward
  • Half-duplex
  • Outageprobability
  • Two-wayrelaying

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