Adaptive Modulation for FSO IM/DD Systems with Multiple Transmitters and Receivers

Hatef Nouri, Sadiq M. Sait, Murat Uysal

Research output: Contribution to journalArticlepeer-review


Atmospheric turbulence is a major impairment in free space optical (FSO) communication systems. Since turbulence induced fading exhibits quasi-static characteristics, reliable feedback of channel state information is possible allowing the implementation of adaptive transmission. In this letter, we consider multiple-input single-output (MISO) and single-input multiple-output (SIMO) FSO systems with pulse position modulation (PPM) and pulse amplitude modulation (PAM). We propose an adaptive algorithm where the modulation size/type is adjusted according to the channel fading conditions. We formulate the design of adaptive algorithm to maximize the spectral efficiency under peak and average power constraints while maintaining a targeted value of outage probability. We present extensive Monte Carlo simulations to demonstrate the performance of proposed adaptive scheme over turbulence channels.

Original languageEnglish (US)
Pages (from-to)586-590
Number of pages5
JournalIEEE Communications Letters
Issue number2
StatePublished - Feb 1 2023


  • Free space optical communications
  • adaptive transmission
  • multiple apertures
  • turbulence channels

ASJC Scopus subject areas

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


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