变电站RIS辅助覆盖性能分析和建模仿真
Substation RIS assisted coverage performance analysis and modeling simulation
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摘要: 变电站移动巡检等新兴业务对无线覆盖质量提供更高要求。为了提升非视距区域的信号覆盖能力，开展可重构智能反射面(Reconfigurable Intelligent Reflector，RIS)辅助的变电站室内信号覆盖性能分析和建模仿真。针对RIS两个级联子信道特点，采用射线跟踪技术（Ray Tracing，RT）对信号进行处理并获取电磁传播特性。RIS对来自发送的发送信号进行相位调控后反射给信号薄弱区域，接收端接收RIS辅助传输的多径信息增强覆盖性能。为了降低跟踪的计算成本，提出了一种基于无反射路径的近似模型。最后分别从接收功率、功率时延谱、时延扩展和计算成本等方面进行仿真对比。实验结果表示，RIS辅助传输能显著提高信号有效覆盖率，近似模型可实现精度和计算时长的有效折中。Abstract: Emerging services such as substation mobile inspection have higher requirements for wireless coverage quality. In order to improve the signal coverage capability in non-line-of-sight area, the indoor signal coverage performance analysis and modeling simulation with the assistance of Reconfigurable Intelligent Reflector (RIS) are carried out. According to the characteristics of RIS two cascaded sub-channels, Ray Tracing (RT) was used to process the signal and obtain the electromagnetic propagation characteristics. RIS performs phase control on the sent signal and then reflects it to the signal weak area. The receiving end receives the multipath information assisted by RIS to enhance the coverage performance. In order to reduce the computational cost of tracking, an approximate model based on non-reflective path is proposed. Finally, the received power, power delay spectrum, delay spread and calculation cost are simulated and compared respectively. The experimental results show that RIS assisted transmission can significantly improve the effective signal coverage, and the approximate model can achieve an effective compromise between accuracy and calculation time.
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