Max-min relay selection for legacy amplify-and-forward systems with interference

I. Kirkidis, John Thompson, N. Goertz, Stephen McLaughlin

Research output: Contribution to journalArticlepeer-review


In this paper, an amplify-and-forward (AF) cooperative strategy for interference limited networks is considered. In contrast to previously reported work, where the effect of interference is ignored, the effect of multi-user interference in AF schemes is analyzed. It is shown that the interference changes the statistical description of the conventional AF protocol and a statistical expression is subsequently derived. Asymptotic analysis of the expression shows that interference limits the diversity gain of the system and the related channel capacity is bounded by a stationary point. In addition, it is proven that previously proposed relay selection criteria for multi-relay scenarios become inefficient in the presence of interference. Based on consideration of the interference term, two extensions to the conventional max-min selection scheme suitable for different system setups are proposed. The extensions investigated are appropriate for legacy architectures with limitations on their flexibility where the max-min operation is pre-designed. A theoretical framework for selecting when to apply the proposed selection criteria is also presented. The algorithm investigated is based on some welldefined capacity approximations and incorporates the outage probabilities averaged over the fading statistics. Analytical results and simulation studies reveal enhancements of the proposed algorithm.
Original languageEnglish
Pages (from-to)3016-3027
Number of pages12
JournalIEEE Transactions on Wireless Communications
Issue number6
Publication statusPublished - Jun 2009


  • Cooperative diversity
  • relay channel
  • interference
  • outage probability
  • wireless networks


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