Performance Analysis of Parallel Relaying in Free-Space Optical Systems

Sahar Molla Aghajanzadeh, Murat Uysal

Research output: Contribution to journalArticlepeer-review


In this paper, we investigate the information theoretic performance of parallel relaying in free-space optical (FSO) communications over Gamma-Gamma fading channels. We consider an intensity modulation/direct-detection (IM/DD) FSO system with a single relay and a line-of-sight link between the source and the destination. Considering both amplify-And-forward and decode-And-forward relaying, we develop performance characterizations of each relaying mode in terms of outage probability, diversity gain, coding gain, and diversity-multiplexing tradeoff (DMT). Our results demonstrate that parallel relaying improves the performance of FSO systems by bringing diversity advantages. In addition, both relaying modes achieve the same DMT and diversity gain while their coding gains can be different depending on underlying channels' characteristics.

Original languageEnglish (US)
Article number7208832
Pages (from-to)4314-4326
Number of pages13
JournalIEEE Transactions on Communications
Issue number11
StatePublished - Nov 2015


  • Free-space optical communications
  • coding gain
  • diversity gain
  • diversity-multiplexing tradeoff
  • parallel relaying

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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