BER performance of free-space optical transmission with spatial diversity

S. Mohammad Navidpour, Murat Uysal, Mohsen Kavehrad

Research output: Contribution to journalArticlepeer-review


Free space optical (FSO) communications is a cost-effective and high bandwidth access technique, which has been receiving growing attention with recent commercialization successes. A major impairment in FSO links is the turbulence-induced fading which severely degrades the link performance. To mitigate turbulence-induced fading and, therefore, to improve the error rate performance, spatial diversity can be used over FSO links which involves the deployment of multiple laser transmitters/receivers. In this paper, we investigate the bit error rate (BER) performance of FSO links with spatial diversity over log-normal atmospheric turbulence fading channels, assuming both independent and correlated channels among transmitter/receiver apertures. Our analytical derivations build upon an approximation to the sum of correlated log-normal random variables. The derived BER expressions quantify the effect of spatial diversity and possible spatial correlations in a log-normal channel.

Original languageEnglish (US)
Pages (from-to)2813-2819
Number of pages7
JournalIEEE Transactions on Wireless Communications
Issue number8
StatePublished - Aug 2007


  • Atmospheric turbulence
  • Bit error rate
  • Error rate performance analysis
  • Free space optical communication
  • Log-normal channel
  • MIMO

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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