Novel adaptive transmission algorithms for free-space optical links

Mehdi Karimi, Murat Uysal

Research output: Contribution to journalArticlepeer-review


Atmospheric turbulence is a major degrading factor in free-space optical (FSO) systems. Since turbulence-induced fading results in a very slowly-varying channel, reliable feedback is possible allowing the implementation of adaptive transmission in practical FSO systems. In this paper, we propose adaptive transmission algorithms in which transmit power and/or modulation size are varied according to the channel conditions. The design of adaptive algorithms is formulated as optimization problems of spectral efficiency and average power consumption at a targeted value of outage probability under peak power constraints. The proposed adaptive schemes bring significant improvements over their non-adaptive counterparts.

Original languageEnglish (US)
Article number6302116
Pages (from-to)3808-3815
Number of pages8
JournalIEEE Transactions on Communications
Issue number12
StatePublished - 2012


  • Free-space optical communications
  • adaptive transmission
  • fading channel
  • pulse position modulation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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