基于NOMA的共生反向散射通信的性能分析  

Performance analysis of NOMA based symbiotic ambient backscatter communication

作　　者：李新颖[1] 张丽君 刘英挺 LI Xinying;ZHANG Lijun;LIU Yingting(School of Electronics and Information Engineering,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China)

机构地区：[1]兰州交通大学电子与信息工程学院,甘肃兰州730070

出　　处：《云南大学学报（自然科学版）》2024年第5期881-887,共7页Journal of Yunnan University(Natural Sciences Edition)

基　　金：甘肃省自然科学基金(23JRRA849,22JR5RA361,23JRRA894).

摘　　要：非正交多址接入和环境反向散射通信是提高无线通信系统频谱效率的关键技术.针对能量受限问题,提出了一种基于瑞利衰落信道的下行非正交多址接入多路传输的共生反向散射通信系统.该系统由1个源节点S、1个反向散射设备BD和1个目的节点D组成.考虑到实际的非线性能量收集模型,在满足反射设备的能量因果约束的情况下,采用了一种最优动态反射系数以最大化反向散射信号的功率,推导了该系统中断概率的解析表达式,通过仿真验证了理论推导的正确性.仿真结果表明,反射设备电路的自身损耗对系统中断性能有重要影响.此外,通过仿真对比分析了基于非正交多址的共生反向散射通信系统和基于正交多址的共生反向散射通信系统性能,结果表明基于非正交多址的共生反向散射通信系统具有更好的中断性能.Non-orthogonal multiple access(NOMA)and ambient backscatter communication(AmBC)are key technologies to improve the spectral efficiency of wireless communication systems.A symbiotic backscatter communication system based on Rayleigh fading channel for downlink NOMA multiplexing is proposed to solve the energy constraint problem.The system consists of one source node S,one backscatter device BD and one destination node D.Considering a practical non-linear energy harvesting model,in the case of satisfying the energy causal constraint of BD,an optimal dynamic reflection coefficient was used to maximize the power of backscattered signal,and an analytical expression of the outage probability of this system was derived.The correctness of the theoretical derivation was verified by simulation.The simulation results show that the loss of BD circuit has an important effect on the outage performance of the system.In addition,the performance of NOMA based symbiotic AmBC system and OMA based symbiotic AmBC system is compared and analyzed by simulation.The simulation results show that NOMA based symbiotic AmBC system has better outage performance.

关 键 词：非正交多址技术(NOMA) 环境反向散射通信(AmBC) 非线性能量收集 中断概率 

分 类 号：TN926[电子电信—通信与信息系统]