Differential modulation for cooperative wireless systems

Qiang Zhao, Hongbin Li

Research output: Contribution to journalArticlepeer-review

103 Scopus citations

Abstract

This paper examines differential binary modulation for wireless networks that utilize wireless relays to seek cooperative diversity and improved performance. Two differential cooperative transmission schemes, referred to as differential amplify-and-forward (DAF) and differential decode-and-forward (DDF), respectively, are introduced. These schemes require no channel state information at any node in the system. A set of analytical results pertaining to the probability density function of the instantaneous signal-to-noise ratio, average bit error rate, outage probability, and diversity order of the proposed schemes in Rayleigh fading channels are obtained. The analytical results are confirmed by numerical simulations. It is shown that the differential cooperative DAF and DDF schemes achieve cooperative diversity and outperform the conventional noncooperative differential modulation.

Original languageEnglish
Pages (from-to)2273-2283
Number of pages11
JournalIEEE Transactions on Signal Processing
Volume55
Issue number5 II
DOIs
StatePublished - May 2007

Keywords

  • Average bit error rate (BER)
  • Cooperative diversity
  • Differential modulation
  • Outage probability
  • Wireless relays

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