Multi-hop coherent free-space optical communications over atmospheric turbulence channels

Sahar Molla Aghajanzadeh, Murat Uysal

Research output: Contribution to journalArticlepeer-review


In this paper, we investigate multi-hop relaying as an efficient fading mitigation tool for coherent free-space optical (FSO) systems over atmospheric turbulence channels. We consider an FSO relaying system with decode-and-forward relay nodes and multiple heterodyne receivers with modal compensation. Based on a recently introduced statistical characterization for the combined effects of log-normal turbulence fading and modal compensation, we derive the outage probability and quantify the potential performance improvements through the derivation of diversity-multiplexing tradeoff (DMT) and diversity gain. Our outage analysis yields impressive power savings for multi-hop relaying even with a single-relay. In addition, the DMT analysis in practical signal-to-noise ratio (SNR) ranges demonstrates that multi-hop transmission scheme improves finite-SNR diversity gain throughout the range of the multiplexing gain.

Original languageEnglish (US)
Article number5771502
Pages (from-to)1657-1663
Number of pages7
JournalIEEE Transactions on Communications
Issue number6
StatePublished - Jun 2011


  • Free-space optical systems
  • atmospheric turbulence-induced fading
  • finite-SNR diversity-multiplexing tradeoff
  • multi-hop transmission

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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