基于NOMA的环境反向散射通信系统性能分析  

Performance analysis of NOMA based ambient backscattercommunication system

作　　者：张万权 李锦屏[1] ZHANG Wanquan;LI Jinping(School of Electronics and Information Engineering,Lanzhou Jiaotong University,Lanzhou 730070,P.R.China)

机构地区：[1]兰州交通大学电子与信息工程学院,兰州730070

出　　处：《重庆邮电大学学报(自然科学版)》2025年第2期215-221,共7页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：甘肃省科技计划项目(23JRRA892,22JR5RA361,23JRRA894)。

摘　　要：研究了基于非正交多址的环境反向散射通信系统的中断性能。在考虑反射设备能量因果约束问题的基础上,引入了一种实际的非线性能量收集模型,采用最优动态反射系数以最小化反射链路的中断概率,并推导反射设备和2个用户中断概率的精确和渐近表达式以及分集阶数。分析了不同系统参数对系统中断概率的影响,通过蒙特卡洛仿真验证了理论分析的正确性。仿真结果表明,反射设备能量因果约束对系统的性能有重要的影响,基于非正交多址的环境反向散射通信系统的中断性能优于基于正交多址的环境反向散射通信系统。In this paper,we investigate the outage performance of ambient backscatter communication systems based on non-orthogonal multiple access.Firstly,a practical nonlinear energy harvesting model is introduced based on the consideration of the energy causality constraint problem of the reflecting device.Secondly,optimal dynamic reflection coefficients are employed to minimize the outage probability of the reflective link.Exact and asymptotic expressions for the outage probability of the reflective device and the two users,as well as the diversity order,are derived.Finally,the effects of different system parameters on the system outage probability are analyzed.The correctness of the theoretical analysis is verified by Monte Carlo simulation,and the simulation results show that the reflection device energy causality constraint has an important impact on the performance of the system,and the outage performance of the ambient backscatter communication system based on non-orthogonal multiple access is better than that of the ambient backscatter communication system based on orthogonal multiple access.

关 键 词：环境反向散射 非正交多址接入 能量收集 中断概率 

分 类 号：TN926[电子电信—通信与信息系统]