Probability of error for noncoherent M-ary orthogonal FSK with postdetection switched combining

Marvin K. Simon*, Mohamed Slim Alouini

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

18 Scopus citations


This letter extends the notion of postdetection switched combining previously introduced by the authors to M-ary orthogonal modulation and proceeds to analyze and evaluate its average bit-error rate performance for the dual-branch case. The particular variation chosen for the switching strategy uses a different model than that previously used for the binary case and although it results in a slightly poorer performance, it nevertheless outperforms conventional (predetection) switched combining for all values of M. Results are obtained for a variety of popular channel models including Rayleigh, Rician, and Nakagami-m fading. Because of its relative simplicity of implementation, the proposed scheme once again offers a very attractive low-complexity solution for mitigating the deleterious effects of multipath fading.

Original languageEnglish (US)
Pages (from-to)1456-1462
Number of pages7
JournalIEEE Transactions on Communications
Issue number9
StatePublished - Sep 2003
Externally publishedYes


  • M-ary frequency shift keying
  • M-ary noncoherent orthogonal modulation
  • Postdetection diversity
  • Switched combining

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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