Amplify-and-forward cooperative OFDM with multiple-relays: Performance analysis and relay selection methods

Yanwu Ding, Murat Uysal

Research output: Contribution to journalArticlepeer-review


In this paper, we investigate a cooperative system with multiple relays and amplify-and-forward relaying over frequency-selective channels. To extract the available multipath diversity, we employ orthogonal frequency division multiplexing (OFDM) with precoding. Through the derivation of pairwise error probability (PEP), we demonstrate that PEP is not a simple exponential function of the signal-to-noise ratio (SNR), but it includes a term that involves some power of logarithm of the SNR. If that term is ignored, the diversity order is given by the summation of the channel length in the direct link and the minimum of channel lengths in each relaying link confirmed by simulation results. Based on the PEP expression, we also propose two relay selection strategies; one is on a per-subcarrier basis and the other is on an all-subcarrier basis. Our simulation results indicate that both strategies result in performance improvements although the per-subcarrier method performs better.

Original languageEnglish (US)
Article number5288929
Pages (from-to)4963-4968
Number of pages6
JournalIEEE Transactions on Wireless Communications
Issue number10
StatePublished - Oct 2009


  • Amplify-and-forward relaying
  • OFDM
  • Pairwise error probability
  • Precoding
  • Relay selection

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


Dive into the research topics of 'Amplify-and-forward cooperative OFDM with multiple-relays: Performance analysis and relay selection methods'. Together they form a unique fingerprint.

Cite this