It is difficult for free space optical communication to be applied in mobile communication due to the obstruction of obstacles in the environment, which is expected to be solved by reconfigurable intelligent surface technology. The reconfigurable intelligent surface is a new type of digital coding meta-materials, which can reflect, compute and program electromagnetic and optical waves in real time. We purpose a controllable multi-branch wireless optical communication system based on the optical reconfigurable intelligent surface technology. By setting up multiple optical reconfigurable intelligent surface in the environment, multiple artificial channels are built to improve system performance and to reduce the outage probability. Three factors affecting channel coefficients are investigated in this paper, which are beam jitter, jitter of the reconfigurable intelligent surface and the probability of obstruction. Based on the model, we derive the closed-form probability density function of channel coefficients, the asymptotic system's average bit error rate and outage probability for systems with single and multiple branches. It is revealed that the probability density function contains an impulse function, which causes irreducible error rate and outage probability floors. Numerical results indicate that compared with free-space optical communication systems with single direct path, the performance of the multi-branch system is improved and the outage probability is reduced.

中文翻译：

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具有可重构智能表面和随机障碍物的无线光通信性能

由于环境中障碍物的阻碍，自由空间光通信难以应用于移动通信，有望通过可重构智能表面技术解决。可重构智能表面是一种新型的数字编码超材料，可以实时反射、计算和编程电磁波和光波。我们旨在构建基于光可重构智能表面技术的可控多分支无线光通信系统。通过在环境中设置多个光可重构智能面，构建多个人工通道，提高系统性能，降低中断概率。本文研究了影响信道系数的三个因素，即波束抖动、可重构智能面的抖动和阻塞概率。基于该模型，我们推导出信道系数的闭式概率密度函数、渐近系统的平均误码率和单支路和多支路系统的中断概率。结果表明，概率密度函数包含一个脉冲函数，导致不可约的错误率和中断概率底。数值结果表明，与单直接路径的自由空间光通信系统相比，多分支系统的性能得到提高，中断概率降低。s 具有单个和多个分支的系统的平均误码率和中断概率。结果表明，概率密度函数包含一个脉冲函数，导致不可约的错误率和中断概率底线。数值结果表明，与单直接路径的自由空间光通信系统相比，多分支系统的性能得到提高，中断概率降低。s 具有单个和多个分支的系统的平均误码率和中断概率。结果表明，概率密度函数包含一个脉冲函数，导致不可约的错误率和中断概率底线。数值结果表明，与单直接路径的自由空间光通信系统相比，多分支系统的性能得到提高，中断概率降低。