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Reconfigurable intelligent surface (RIS) is an excellent use case forline-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), andMalaga (M) distributions for atmospheric turbulence with zero-boresightpointing errors over deterministic as well as random path-loss in foggyconditions with heterodyne detection (HD) and intensity modulation/directdetection (IM/DD) methods. By deriving the probability density function (PDF)and cumulative distribution function (CDF) of the direct-link (DL) with thestatistical effect of atmospheric turbulence, pointing errors, and random fog,we develop exact expressions of PDF and CDF of the resultant channel for theRISE-FSO system. Using the derived statistical results, we present exactexpressions of outage probability, average bit-error-rate (BER), ergodiccapacity, and moments of signal-to-noise ratio (SNR) for both DL-FSO andRISE-FSO systems. We also develop an asymptotic analysis of the outageprobability and average BER and derive the diversity order of the consideredsystems. We validate the analytical expressions using Monte-Carlo simulationsand demonstrate the performance scaling of the FSO system with the number ofRIS elements for various turbulence channels, detection techniques, and weatherconditions.

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