多RIS辅助通信网络协同传输性能研究  

Research on Cooperative Transmission Performance of Multi-RIS Auxiliary Communication Network

作　　者：孟祥浩 安康 施育鑫 林志 MENG Xianghao;AN Kang;SHI Yuxin;LIN Zhi(School of Electronics and Information Engineering,Nanjing University of Information Technology,Nanjing 210044,China;Sixty-third Research Institute,National University of Defense Technology,Nanjing 210007,China;School of Electronic Warfare,National University of Defense Technology,Hefei 230037,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044 [2]国防科技大学第六十三研究所,江苏南京210007 [3]国防科技大学电子对抗学院,安徽合肥230037

出　　处：《无线电通信技术》2024年第2期303-311,共9页Radio Communications Technology

基　　金：国家自然科学基金(62201592,61901502)。

摘　　要：研究了多智能超表面(Reconfigurable Intelligent Surface, RIS)辅助的无线系统的传输性能。在无线信道传播环境中部署多个相同几何尺寸的RIS,考虑不同RIS所关联的无线信道是独立非同分布且具有不同的分布和统计特性,基于上述系统模型提出了两种目标导向的多RIS辅助方案,即穷举式(Exhaustive RIS-Aided, ERA)和机会式(Opportunistic RIS-Aided, ORA)方案。利用基于矩量法的端到端信道数学模型,可以将端到端信道系数近似为伽马分布,从中断概率(Outage Probability, OP)和各态历经容量(Ergodic Capacity, EC)两种性能指标分别对两种方案的性能进行评估。通过研究EC的上下界,提供了快速估算可达传输速率的方法。结果表明ORA方案可以优化能量效率,ERA方案在OP和EC方面优于ORA方案。The performance analysis of multi Reconfigurable Intelligent Surface(RIS)aided wireless system is studied.Multiple RIS of the same geometric size are deployed in wireless channel to improve the communication system performance,considering that the wireless channels associated with different RIS are independent and non-identically distributed with different distribution and statistical characteristics.Based on the system model above,two goal-oriented multi-RIS auxiliary schemes are proposed,namely Exhaustive RIS-Aided(ERA)and Opportunistic RIS-Aided(ORA)schemes.A mathematical model of end-to-end channel based on moment method is used.The end-to-end channel coefficient can be approximated to gamma distribution.Based on this,the performance of the two schemes is evaluated in terms of Outage Probability(OP)and Ergodic Capacity(EC).The upper and lower bounds of channel capacity are studied,and a fast method for estimating the reachable transmission rate is provided.Results show that ERA scheme is better than ORA scheme in OP and EC.

关 键 词：智能超表面 性能分析 伽马分布 各态历经容量 中断概率 

分 类 号：TN975[电子电信—信号与信息处理]