论文标题
自由空间光学通信，可重构智能表面
Free-Space Optical Communication With Reconfigurable Intelligent Surfaces
论文作者
论文摘要
尽管有希望的收益，但自由空间光学（FSO）的通信受到大气湍流和指向错误问题的严重影响，这使其实用的设计有些挑战。在本文中，为了提高通信覆盖范围并提高系统性能，在FSO通信设置中考虑了可重构的智能表面（RISS），其中考虑了大气湍流和指向错误。假设在RIS处的大量反射元素，则会得出中断概率，平均位错误率和通道容量的闭合形式表达式。具体而言，根据中央限制定理（CLT），提出了多个反射元件近似表达式的同时。结果表明，随着RIS处的元素数量的增加，各自的精度会增加。显示了说明性的数值示例以及有见地的讨论。最后，提出了蒙特卡洛模拟，以验证分析结果的正确性。
Despite the promising gains, free-space optical (FSO) communication is severely influenced by atmospheric turbulence and pointing error issues, which make its practical design a bit challenging. In this paper, with the aim to increase the communication coverage and improve the system performance, reconfigurable intelligent surfaces (RISs) are considered in an FSO communication setup, in which both atmospheric turbulence and pointing errors are considered. Closed-form expressions for the outage probability, average bit error rate, and channel capacity are derived assuming large number of reflecting elements at the RIS. Specifically, according to central limit theorem (CLT), while assuming multiple reflecting elements approximate expressions are proposed. It is shown that the respective accuracies increase as the number of elements at the RIS increases. Illustrative numerical examples are shown along with insightful discussions. Finally, Monte Carlo simulations are presented to verify the correctness of the analytical results.
