Relay-Assisted Free-Space Optical Communication

Majid Safari, Murat Uysal

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, we present relay-assisted transmission as a powerful fading mitigation tool for free-space optical systems operating in atmospheric turbulence channels. We study both serial (i.e., multi-hop transmission) and parallel (i.e., cooperative diversity) relaying encoupled with amplify-and-forward and decode-and-forward modes. We consider an aggregated channel model which takes into account both path-loss and turbulence-induced log-normal fading. Since fading variance is distance-dependent in free-space optical systems, relay-assisted transmission takes advantage of the resulting shorter hops and yields significant performance improvements. We derive outage probability of the relaying schemes under consideration which are further confirmed through Monte-Carlo simulations. Our outage probability analysis demonstrates that an impressive performance improvement of 18.5 dB is possible with the use of a single relay at a target outage probability of 10(-6).

Original languageEnglish
Pages (from-to)5441-5449
Number of pages9
JournalIEEE Transactions on Wireless Communications
Volume7
Issue number12
DOIs
Publication statusPublished - Dec 2008
Event2007 41st Asilomar conference on Signals, Systems and Computers (ACSSC) - Pacific Grove, CA, USA, United Kingdom
Duration: 4 Nov 20077 Nov 2007

Keywords

  • Free-space optical systems
  • cooperative diversity
  • fading channels
  • ATMOSPHERIC-TURBULENCE CHANNELS
  • OUTAGE PROBABILITY
  • FADING CHANNELS
  • PART 1
  • DIVERSITY
  • TRANSMISSION
  • PERFORMANCE
  • NETWORKS
  • SYSTEM
  • LINKS

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