Incremental Diversity Order for Characterization of FSO Communication Systems over Lognormal Fading Channels

Mohammed Elamassie, Murat Uysal

Research output: Contribution to journalArticlepeer-review

Abstract

Free space optical (FSO) communication systems experience atmospheric turbulence-induced fading, which is typically modelled by lognormal distribution. Since the decreasing rate of error probability over lognormal fading channels does not converge to a finite value, the conventional definition of diversity order yields infinity and does not provide any insight into system design. In this letter, we propose the so-called incremental diversity order (IDO), which is defined as the incremental change in the decreasing rate of bit error rate (BER) on a log-log scale. As an example, we consider multiple-input multiple-output (MIMO) FSO system over lognormal turbulence channels. We derive a novel closed-form BER expression in terms of Lambert-W function and obtain IDO as a function of the number of laser sources, the number of photodetectors and the variance of the log-amplitude coefficient. We further present numerical results to validate the derived BER expression and associated IDO.

Original languageEnglish (US)
Article number8959173
Pages (from-to)825-829
Number of pages5
JournalIEEE Communications Letters
Volume24
Issue number4
DOIs
StatePublished - Apr 2020

Keywords

  • Asymptotic analysis
  • Free space optical communication
  • Incremental diversity order
  • Lognormal fading

ASJC Scopus subject areas

  • Modeling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering

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