基于非线性能量收集的非线性信息状态更新系统的信息新鲜度分析  

Information freshness analysis of nonlinear information state update system based on nonlinear energy harvesting

作　　者：薛凯来 贾向东 韩向花[1] 牛夏秧 张亮 XUE Kailai;JIA Xiangdong;HAN Xianghua;NIU Xiayang;ZHANG Liang(College of Computer Science&Engineering,Northwest Normal University,Lanzhou 730070;Wireless Communication Key Lab of Jiangsu Province,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]西北师范大学计算机科学与工程学院,甘肃兰州730070 [2]南京邮电大学江苏省无线通信重点实验室,江苏南京210003

出　　处：《计算机工程与科学》2025年第4期644-654,共11页Computer Engineering & Science

基　　金：国家自然科学基金(62261048,61861039);甘肃省教育厅产业支撑计划项目(2025CYZC-014)。

摘　　要：针对Nakagami-m衰落信道中时间敏感放大转发(AF)中继辅助物联网系统的非线性信息年龄AoI和能量效率EE的权衡问题,首先提出了一个AF中继传输模型,从而找到端到端近似信噪比SNR。其次,通过考虑Nakagami-m衰落信道中过时的信道状态信息CSI,推导出端到端包传输错误概率。最后,在同时考虑非线性能量收集EH和过时CSI的情况下,得出传感器电池充满电的时间和更新数据包发送时间间隔的统计描述,并利用过时的CSI和EH电路的非线性特性,建立了非线性AoI对EE的权衡模型。实验结果表明,当数据包长在200~250 b之间,且源发射功率在35 dBm时,AoI-EE达到最优。This paper aims to address the trade-off between the nonlinear age of information(AoI)and the energy efficiency(EE)of time-sensitive amplified forwarding(AF)relay-assisted IoT systems in Nakagami-m fading channels.Firstly,an AF relay transmission model is proposed to find the end-to-end approximate signal-to-noise ratio(SNR).Secondly,the end-to-end block error probability of packet transmission is derived by considering the outdated channel state information(CSI)in the Nakagami-m fading channel.Finally,under the simultaneous consideration of non linear energy harvesting(EH)and outdated CSI,the statistical descriptions of the time duration for the sensor to fully charge its battery are derived as well as those of the time intervals of update packet delivery.As a result,the average AoI is achieved with closed-form expression and the trade-off model of nonlinear AoI to EE is established by simultaneously exploiting outdated CSI and non-linearity of EH circuit.The experimental results show that when the packet length is between 200~250 b and the source transmit power is 35 dBm,the AoI-EE achieves the optimum.

关 键 词：非线性信息年龄 非线性能量收集 过时的信道状态信息 Nakagami-m 

分 类 号：TN925[电子电信—通信与信息系统]