Performance analysis of multibranch switched diversity systems

Hong Chuan Yang*, Mohamed Slim Alouini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

152 Scopus citations


We investigate the performance of multibranch switched diversity systems. Specifically, we first derive generic formulas for the cumulative distribution function, probability density function, and moment-generating function of the combined signal power for both switch-and-stay combining (SSC) and switch-and-examine combining (SEC) schemes. We then capitalize on these expressions to obtain closed-form expressions for the outage probability and average error rate for various practical communication scenarios of interest. As a byproduct of our analysis we prove that for SSC with identically distributed and uniformly correlated branches, increasing the number of branches to more than two does not improve the performance, but the performance can be different in the case the branches are not identically distributed and/or not uniformly correlated. We also show that, in general, the SEC performance improves with additional branches. The mathematical formalism is illustrated with a number of selected numerical examples.

Original languageEnglish (US)
Pages (from-to)782-794
Number of pages13
JournalIEEE Transactions on Communications
Issue number5
StatePublished - May 2003
Externally publishedYes


  • Cellular radio systems
  • Diversity techniques
  • Fading correlation
  • Outage probability
  • Performance analysis
  • Transmit diversity and switched combining

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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