User Cooperation Diversity - Part II: Implementation Aspects and Performance Analysis

Andrew Sendonaris, Elza Erkip, Behnaam Aazhang

Research output: Contribution to journalArticlepeer-review


This is the second in a two-part series of papers on a new form of spatial diversity, where diversity gains are achieved through the cooperation of mobile users. Part I described the user cooperation concept and proposed a cooperation strategy for a conventional code-division multiple-access (CDMA) system. Part II investigates the cooperation concept further and considers practical issues related to its implementation. In particular, we investigate the optimal and suboptimal receiver design, and present performance analysis for the conventional CDMA implementation proposed in Part I. We also consider a high-rate CDMA implementation and a cooperation strategy when assumptions about the channel state information at the transmitters are relaxed. We illustrate that, under all scenarios studied, cooperation is beneficial in terms of increasing system throughput and cell coverage, as well as decreasing sensitivity to channel variations.

Original languageEnglish (US)
Pages (from-to)1939-1948
Number of pages10
JournalIEEE Transactions on Communications
Issue number11
StatePublished - Nov 2003


  • Code-division multiple access (CDMA)
  • Diversity
  • Fading
  • Information rates
  • Multiuser channels

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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