On the diversity gain in cooperative relaying channels with imperfect CSIT

Xiao Juan Zhang, Yi Gong, Khaled Ben Letaief

Research output: Contribution to journalArticle

47 Citations (Scopus)


In this paper, we investigate the impact of imperfect channel state information at the transmitters (CSIT) on the achievable diversity gain in a cooperative relaying channel with multiple destination antennas, where the CSIT comes from channel estimation at the transmitters. Both decode-and-forward (DF) and amplify-and-forward (AF) relaying protocols are considered. We show that transmit power control based on the imperfect CSIT significantly improves the achievable diversity gain. The diversity and multiplexing tradeoff (DMT) as a function of the CSIT quality of the source-relay link, source-destination link and relay-destination link is derived for each of the considered relaying schemes. An upper bound on the DMT of the relaying channel is also provided.

Original languageEnglish
Article number5439330
Pages (from-to)1273-1279
Number of pages7
JournalIEEE Transactions on Communications
Issue number4
Publication statusPublished - 1 Apr 2010



  • Channel state information
  • Diversity
  • Diversity and multiplexing tradeoff
  • Relaying channel
  • Spatial multiplexing

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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