可重构智能表面辅助传输的电力通信中继系统性能分析与功率优化分配

利用电力线通信和可重构智能表面(Reconfigurable Intelligent Surface, RIS)辅助传输可提升室内电力物联网的边缘覆盖能力，有必要研究信道、RIS部署和功率分配等对系统性能的影响。针对电力线接入和分布式RIS辅助传输的混合通信场景，采用对数正态分布的电力线衰落模型、多个RIS模块独立且不同参数的Nakagami分布无线衰落模型，推导了系统中断概率和误码率等理论性能；考虑信道估计算法精度对系统性能的影响，采用矩生成函数近似等算法建模分析了非理想信道估计条件下的系统中断概率性能；通过序列二次规划法进行系统功率优化分配，获得最佳功率分配值。仿真验证了理论性能的有效性和准确性，对比分析了RIS数量及位置、双媒质信道参数、功率分配因子等影响中继系统性能的规律，为电力线通信和RIS在电力物联网应用提供了理论和技术支持。

Performance Analysis and Optimal Power Allocation of Power Communication Relay System Assisted by Reconfigurable Intelligent Surface

Using power line access and reconfigurable intelligent surface (RIS) assisted transmission can improve the edge coverage of indoor power Internet of Things. It is necessary to study the impact of the channel, RIS deployment, and power distribution on system performance. For the hybrid communication scenario of power line access and distributed multi-RIS-assisted transmission, The power line fading model with lognormal distribution and Nakagami distributed wireless fading model with multiple RIS modules and independent and different parameters are used to derive the theoretical performance of system outage probability and bit error rate. Considering the influence of channel estimation algorithm accuracy on system performance, the moment generating function approximation algorithm is used to model and analyze the system outage probability performance under the condition of imperfect channel estimation; The optimal power allocation value is obtained by using the sequential quadratic programming method to optimize the power allocation of the system. The simulation verifies the validity and accuracy of the theoretical model, compares and analyzes the rules that the number and location of RISs, dual media channel parameters, power allocation factors, and other factors affect the performance of relay systems, and provides theoretical and technical support for the application of RISs in the power Internet of Things.