SER of multiple amplify-and-forward relays with selection diversity

Phee Lep Yeoh*, Maged Elkashlan, Zhuo Chen, Iain B. Collings

*Corresponding author for this work

Research output: Contribution to journalArticle

24 Citations (Scopus)


In wireless mesh networks, it is desirable to utilize overlapping coverage of multiple parallel relays to assist the source-destination transmission. In this letter, we consider selection diversity (SD) to select the strongest link amongst the direct and N amplify-and-forward (AF) relay links. We derive new closed-form expressions for the symbol error rate (SER) in independent but not necessarily identically distributed (i.n.d.) Rayleigh fading relay channels. Our results are given as both lower bound and asymptotic expressions based on an accurate upper bound on the signal-to-noise ratio (SNR) of the relay links. Our asymptotic results provide key performance parameters such as the array gain and diversity order, which prove that a full N+1 diversity order is achieved. We show that SD can offer an array gain advantage over maximal-ratio combining which entails all the relays to transmit. Numerical results are shown to validate the analysis.

Original languageEnglish
Article number5784175
Pages (from-to)2078-2083
Number of pages6
JournalIEEE Transactions on Communications
Issue number8
Publication statusPublished - Aug 2011
Externally publishedYes


  • cooperative communications
  • Fading channels
  • Wireless relays

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