基于SWIPT的能量收集WSN吞吐量性能分析及优化  

Throughput Performance Analysis and Optimization of Energy Harvesting Wireless Sensor Network Based on Simultaneous Wireless Information and Power Transfer

作　　者：李翠然[1] 杨茜 谢健骊[1] 吕安琪 LI Cuiran;YANG Qian;XIE Jianli;LYU Anqi(School of Electronic and Information Engineering,Lanzhou Jiaotong University,Lanzhou 730070,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：《西南交通大学学报》2024年第5期1014-1022,共9页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金项目(62161016);甘肃省科技计划基金项目(20JR10RA273)。

摘　　要：针对能量收集无线传感器网络(wireless sensor network,WSN)中的两跳多中继传输问题,构建无线射频能量站(power beacon,PB)辅助的能量收集无线携能通信(simultaneous wireless information and power transfer,SWIPT)中继模型.在中继节点具有捕获源节点、环路自干扰和PB信号能量的特性下,推导目的节点采用选择式合并(selection combining,SC)、最大比合并(maximal ratio combining,MRC) 2种不同接收策略下的中断概率和吞吐量,继而在保障通信服务质量(quality of service,QoS)、PB发射功率、能量转化效率等多约束条件下,提出一种以吞吐量最大化为目标的联合优化时隙切换因子与功率分配因子的中继选择算法.仿真和数值结果显示:PB发射功率、时隙切换因子、天线数目、功率分配因子等参数对系统中断概率和吞吐量性能影响显著;当给定PB发射功率为6 dBW,天线数目为3根时,与随机中继选择算法和最大最小中继选择算法相比,本文算法在SC策略下的系统吞吐量增益分别为0.29、0.15 bit/(s·Hz),MRC策略下的吞吐量增益分别为0.32、0.16 bit/(s·Hz).In view of two-hop multi-relay transmission in energy harvesting wireless sensor networks(WSN),a wireless radio frequency power beacon(PB)-assisted energy harvesting relay model based on simultaneous wireless information and power transfer(SWIPT) was constructed.Under the condition that the relay node has the characteristics of capturing the source node,loop self interference,and PB signal energy,the outage probability and throughput of the destination node using two different receiving strategies,namely,selection combining(SC) and maximal ratio combining(MRC),were derived.Then,under multiple constraints such as ensuring communication quality of service(QoS),a relay selection algorithm was proposed to jointly optimize the time switching factor and power splitting factor with the goal of maximizing the throughput.Simulation and numerical results show that the PB transmit power,time switching factor,number of antennas,and power splitting factor significantly affect the system's outage probability and throughput.When PB transmit power is6 dBW,and the number of antennas is 3,compared with the random relay selection algorithm and the max-min relay selection algorithm,the system 's throughput gains under the SC strategy are 0.29 and 0.15 bit/(s· Hz),respectively,and those under the MRC strategy are 0.32 and 0.16 bit/(s·Hz),respectively.

关 键 词：无线传感器网络 无线携能通信 中继选择 能量收集 吞吐量 

分 类 号：TN925[电子电信—通信与信息系统]