Diversity gain analysis of free-space optical communication systems

Majid Safari*, Murat Uysal

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, we present a diversity gain analysis for free-space optical (FSO) diversity systems operating in log-normal atmospheric turbulence channels. We consider a multi-input multi-output (MIMO) system and two decode-and-forward (DF) relay-assisted systems based on either serial (i.e., multi-hop transmission) or parallel (i.e., cooperative diversity) configurations. We adopt the recently introduced so-called "asymptotical relative diversity order" (ARDO) in our analysis and derive ARDOs for FSO diversity systems under consideration. Assuming M transmit and N receive apertures in MIMO scheme, we demonstrate that an ARDO of 4 sigma(2)(x)/ln(1+(exp(4 sigma(2)(x))-1)/MN) is achievable where sigma(2)(x) is the variance of the fading log-amplitude. For weak turbulence conditions (i.e., sigma(x) similar to 0.1), ARDO is well approximated as MN. For DF relaying schemes with K relays each of which is equipped with single transmit/receive apertures, we demonstrate that ARDOs of (K+1)(11/6) and 2(11/6) K are achievable, respectively, for serial and parallel relaying configurations.

Original languageEnglish
Title of host publication2008 CANADIAN CONFERENCE ON ELECTRICAL AND COMPUTER ENGINEERING, VOLS 1-4
Place of PublicationNEW YORK
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1183-1188
Number of pages6
ISBN (Print)978-1-4244-1642-4
Publication statusPublished - 2008
EventCanadian Conference on Electrical and Computer Engineering - Niagara Falls, Canada
Duration: 4 May 20087 May 2008

Publication series

NameCanadian Conference on Electrical and Computer Engineering
PublisherIEEE
ISSN (Print)0840-7789

Conference

ConferenceCanadian Conference on Electrical and Computer Engineering
Country/TerritoryCanada
Period4/05/087/05/08

Keywords

  • free-space optical systems
  • diversity order
  • fading channels
  • TRANSMISSION
  • NETWORKS

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