【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Ao I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Ao I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。更多还原

【Abstract】 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 Io T systems in Nakagami-m fading channels. Firstly, an AF relay transmission model is proposed to find the end-toend 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 Secondly, the end-to-end block error probability of packet transmission is derived by considering the outdated channel state information(CSI) in the Nakagami-m fading channel. Finally, under the simultaneous consideration of non linear energy harvesting(EH) and outdated CSI, the statistical descriptions of the time duration for the sensor to fully charge its battery are derived as well as those of the time intervals of update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with closed-form expression and the trade-off model of nonlinear AoI toEE is established by simultaneously exploiting outdated CSI and non-linearity of EH circuit.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 Ao IEE achieves the optimum.更多还原