Average symbol error rate analysis of reconfigurable intelligent surfaces-assisted free-space optical link over log-normal turbulence channels

<span>Optical wireless communication (OWC) has attracted significant interest recently in academia and industry. Free-space optical (FSO) systems are where free space acts as a channel between transceivers that line of sight (LOS) for the successful transmission signals. The FSO transmissions through atmosphere, nevertheless, bring significant challenges, besides uncertainty atmospheric channels, especially signal fading due to turbulence, attenuation pointing errors caused by random beam misalignments transceivers, obstruction buildings or trees can pre-vent transmitted message reach destination. This study theoretically investigates average symbol error rate (ASER) reconfigurable intelligent surfaces (RIS) assisted link over log-normal turbulence channels. RIS effect is examined considering influence distance, power, quadrature amplitude modulation (QAM) scheme on ASER.</span>