Performance of Wireless Optical Communication With Reconfigurable Intelligent Surfaces and Random Obstacles
Performance of Wireless Optical Communication With Reconfigurable Intelligent Surfaces and Random Obstacles
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发表时间：
2020-01
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通讯作者：
Haibo Wang;Zaichen Zhang;Bingcheng Zhu;J. Dang;Liang Wu;Lei Wang;Kehan Zhang;Yidi Zhang
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作者：
Haibo Wang;Zaichen Zhang;Bingcheng Zhu;J. Dang;Liang Wu;Lei Wang;Kehan Zhang;Yidi Zhang
自由空间光通信由于环境中障碍物的阻碍，难以应用于移动的通信，可重构智能表面技术有望解决这一问题。可重构智能表面是一种新型的数字编码元材料，能够对电磁波和光波进行真实的实时反射、计算和编程。本文提出了一种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表面，建立多个人工信道，提高系统性能，降低中断概率。本文研究了影响通道系数的三个因素：光束抖动、可重构智能表面抖动和障碍物概率。基于该模型，我们推导出封闭形式的信道系数的概率密度函数，渐近系统的平均误比特率和中断概率的系统具有单分支和多分支。结果表明，概率密度函数中含有一个脉冲函数，这将导致不可约的错误率和中断概率地板。数值结果表明，与单径自由空间光通信系统相比，多分支系统的性能得到改善，中断概率降低。
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.