Unified Performance Analysis of Reconfigurable Intelligent Surface Empowered Free-Space Optical Communications

Vinay Kumar Chapala, S. M. Zafaruddin

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Reconfigurable intelligent surface (RIS) is an excellent use case for line-of-sight (LOS) based technologies such as free-space optical (FSO) communications. In this paper, we analyze the performance of RIS-empowered FSO (RISE-FSO) systems by unifying Fisher-Snedecor (F), Gamma-Gamma (GG), and Malága (M) distributions for atmospheric turbulence with zero-boresight pointing errors over deterministic as well as random path-loss in foggy conditions with heterodyne detection (HD) and intensity modulation/direct detection (IM/DD) methods. By deriving the probability density function (PDF) and cumulative distribution function (CDF) of the direct-link (DL) with the statistical effect of atmospheric turbulence, pointing errors and random fog, we develop exact expressions of PDF and CDF of the resultant channel for the RISE-FSO system. Using the derived statistical results, we present exact expressions of outage probability, average bit-error-rate (BER), ergodic capacity, and moments of signal-to-noise ratio (SNR) for both DL-FSO and RISE-FSO systems. We also develop an asymptotic analysis of the outage probability and average BER and derive the diversity order of the considered systems. We validate the analytical expressions using Monte-Carlo simulations and demonstrate the performance scaling of the FSO system with the number of RIS elements for various turbulence channels, detection techniques, and weather conditions.

Original languageEnglish
Pages (from-to)2575-2592
Number of pages18
JournalIEEE Transactions on Communications
Issue number4
StatePublished - 1 Apr 2022
Externally publishedYes

Bibliographical note

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  • Atmospheric turbulence
  • Diversity order
  • Foxâ s h-function
  • Freespace optical (fso)
  • Performance analysis
  • Pointing errors
  • Reconfigurable intelligent surface (ris)


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