剩余硬件损伤下非线性能量收集全双工双向中继网络的吞吐量优化算法  

Throughput optimization algorithm of full-duplex two-way relay network with non-linear energy harvesting and residual hardware impairments

作　　者：乔峰 仇润鹤[1,2] QIAO Feng;QIU Runhe(College of Information Sciences and Technology,Donghua University,Shanghai 201620,China;Engineering Research Center of Digitized Textile and Fashion Technology,Ministry of Education(Donghua University),Shanghai 201620,China)

机构地区：[1]东华大学信息科学与技术学院,上海201620 [2]数字化纺织服装技术教育部工程研究中心(东华大学),上海201620

出　　处：《计算机应用》2024年第12期3884-3892,共9页journal of Computer Applications

基　　金：上海市自然科学基金资助项目(20ZR1400700)。

摘　　要：为符合能量收集(EH)电路的非线性输出特性和非理想硬件,在无线携能(SWIPT)全双工双向中继网络中应用一种常值-线性-常值EH模型并考虑剩余硬件损伤(RHI)。针对RHI和剩余自干扰(RSI)对中继网络中断性能的影响,提出一种基于黄金分割法的优化算法以提高吞吐量。首先,根据分段信干噪比(SNDR)将端到端中断概率用全概率公式展开,并使用求导和变量代换进行分类讨论,将中断概率的复杂表达式化为一重积分,以获得中断概率的闭合表达式;其次,把所得的端到端中断概率按SNDR阈值的大小进行分段表示,并验证由RHI造成的系统协作效应(OSC);再次,把由中断概率推得的系统吞吐量转换为关于时间切换(TS)系数的函数;最后,分析函数单调性后使用所提优化算法最大化系统吞吐量。仿真结果验证了分段中断概率表达式的准确性和优化算法对系统吞吐量的提升;同时,相较于线性EH模型,全双工模式下应用非线性EH模型会使得系统吞吐量在高信噪比时不升反降。To comply to the non-linear output characteristic and non-ideal hardware of Energy Harvesting(EH)circuits,a constant-linear-constant EH model was applied in Simultaneous Wireless Information and Power Transfer(SWIPT)-enabled full-duplex two-way relay network,and Residual Hardware Impairments(RHIs)were taken into account.To reduce the impact of RHIs and Residual Self-Interference(RSI)on the outage performance of relay network,an optimization algorithm based on golden section method was proposed for improving throughput.Firstly,considering the piecewise Signal-to-Noise-plus-Distortion Ratio(SNDR),the end-to-end outage probability was expanded by the law of total probability,and the differentiation and variable substitution were used for classification discussion,so as to convert the complex expression of the outage probability into a single integral,thus obtaining a closed-form expression of the outage probability.Secondly,the obtained end-to-end outage probability was expressed in piecewise way by the SNDR threshold sizes,and the Overall System Ceiling(OSC)caused by RHI was verified.Thirdly,the system throughput derived from the outage probability was transformed into a function related to the Time Switching(TS)ratio.Finally,after analyzing the monotonicity of the function,the proposed algorithm was used to maximize the system throughput.Simulation results verify the piecewise outage probability expression and better system throughput brought by optimization algorithm.Besides,compared to linear EH models,the application of nonlinear EH models in full-duplex mode results in system throughput decrease instead of increase at high SNDRs.

关 键 词：全双工 非线性能量收集模型 剩余硬件损伤 剩余自干扰 吞吐量 

分 类 号：TN925[电子电信—通信与信息系统]