直达链路下的全双工能量采集中继系统的吞吐量分析  

Throughput Analysis of Full-Duplex Energy Harvesting Relaying Systems with Direct Link

作　　者：徐伟 赵睿[1] 杨裕琳 Xu Wei;Zhao Rui;Yang Yulin(Xiamen Mobile Multimedia Communication Lab,Huaqiao University,Xiamen,Fujian 361021,China)

机构地区：[1]华侨大学厦门市移动多媒体通信实验室

出　　处：《信号处理》2019年第7期1201-1209,共9页Journal of Signal Processing

基　　金：国家自然科学基金(61401165,61362018,61302095);华侨大学研究生科研创新能力培养计划资助项目(17013082033)

摘　　要：针对三节点传输系统,研究了基于时间切换能量采集的全双工放大转发协作中继方案。考虑源和目的地之间存在直达链路,全双工中继节点采用天线选择技术以最小化中继自干扰,目的节点采用最大比合并技术以最大化目的地接收信噪比。在延迟受限传输模式下,推出了自干扰信道增益为常数时系统吞吐量近似闭合表达式。运用最佳目的地选择策略和自适应中继选择策略讨论了系统吞吐量性能。如图4所示,在源发送功率为30 dB时,就系统吞吐量而言,本文算法比其他两种算法分别提高了0.22 bits/s/Hz和0.68 bits/s/Hz。数值分析和蒙特卡洛仿真表明,增加中继个数,增加目的地个数或者增大能量采集效率均能够提升系统吞吐量性能。According to the three-node transmission system,the amplify-and-forward cooperative relaying scheme is investigated by combining time switching-based energy harvesting and full-duplex technologies.Consider a direct link between the source and destination,the full-duplex relay node adopts antenna selection technology to minimize the relay self-interference,and the destination node adopts the maximum ratio combining technology to maximize the received signal-to-noise ratio at the destination.Under the delay-limited transmission mode,the approximate closed form expression for systematical throughput is derived for the self-interference channel gain is constant.In order to discuss the performance of the systematical throughput,the optimal destination selection strategy and adaptive relay selection strategy are applied.As shown in figure 4,when the transmit power of the source is 30 dB,In terms of systematical throughput,the algorithm in this paper increases by 0.22 bits/s/Hz and 0.68 bits/s/Hz,respectively,compared with the other two algorithms.Numerical analysis and Monte Carlo simulations show that,the systematical throughput performance can be improved by increasing whether the number of relays,the number of destinations or the energy harvesting efficiency.

关 键 词：全双工 天线选择 最大比合并 吞吐量 

分 类 号：TN929.531[电子电信—通信与信息系统]