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 Malaga (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.

翻译：在本文中,我们通过将Fisher-Snedecor(FF)、Gamma-Gamma(GG)和Malaga(M)分布与零孔分辨误差和在雾条件下的随机路径失落,采用异差检测(HD)和强度调控/直接检测(IM/DD)方法,对视线技术,如自由空间光学(FSO)通信。我们通过将Fisher-Snedecor(F)、Gamma-Gamma(GG)和Malaga(M)系统在大气中分布,以零孔分辨误差和误差为确定性能的大气扰动,对视线(RIS-FS)系统在雾变异性测试、平均比值(BER)、调试能力(PDDF)和累积分配功能(CDDF)的概率功能,并用SIS-RIS-S(SO-SO)系统的平均度分析,以及SO-RIS-SO-Serviews 的显示性能和平均分析(SO-RIS-RIS-RIS-SA)系统。