论文标题
在存在星际领域的情况下，上行链路光学无线通信系统的性能分析
Performance Analysis of Uplink Optical Wireless Communication System in Presence of STAR-RIS
论文作者
论文摘要
最近，可重新配置的智能表面（RIS）获得了研发兴趣，以修改无线通道特征，以提高无线通信的性能，尤其是当视线渠道的质量不太好时。在这项工作中，在文献中，我们首次使用了非正交多访问可见光通信系统中同时传输和反映RIS（Star-ris）来提高系统的性能。对于两个数据恢复方案，单用户检测（SUD）和连续的干扰取消（SIC），可以得出用户的可实现率。然后，为两种操作模式的星际式操作模式（即能量分类和模式切换案例）制定了总和率优化问题。此外，使用顺序参数凸近似方法来解决总和率优化问题。我们还比较了能量分解和模式切换案例，并表明这两种模式具有相同的性能。最后，讨论了SUD和SIC方案的数值结果以及两个基准测试方案，分时和最大的公平性，并讨论了光谱和能源效率，星线元素的数量，用户的位置和接入点。
Recently, reconfigurable intelligent surface (RIS) has gained research and development interests to modify wireless channel characteristics in order to improve performance of wireless communications, especially when quality of the line-of-sight channel is not that good. In this work, for the first time in the literature, we have used simultaneously transmitting and reflecting RIS (STAR-RIS) in non-orthogonal multiple-access visible light communication system to improve performance of the system. Achievable rates of the users are derived for two data recovery schemes, single-user detection (SUD) and successive interference cancellation (SIC). Then, sum-rate optimization problem is formulated for two operating modes of STAR-RIS, namely energy-splitting and mode-switching cases. Moreover, a sequential parametric convex approximation method is used to solve the sum-rate optimization problems. We have also compared energy-splitting and mode-switching cases and showed that these two modes have the same performance. Finally, numerical results for SUD and SIC schemes and two benchmarking schemes, time-sharing and max-min fairness, are presented and spectral- and energy-efficiency, number of STAR-RIS elements, position of users and access point are discussed.
