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Secrecy Performance Analysis of Wireless Powered Sensor Networks Under Saturation Nonlinear Energy Harvesting and Activation Threshold

机译:饱和非线性能量收集和激活阈值下无线传感器网络的保密性能分析

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摘要

In this paper, we investigate the impact of saturation nonlinear energy harvesting (EH) and activation threshold on the multiuser wireless powered sensor networks (WPSNs) from the physical layer security (PLS) perspective. In particular, for improving the secrecy performance, the generalized multiuser scheduling (GMS) scheme is exploited, in which the th strongest sensor is chosen based on the legitimate link. For evaluating the impact of various key parameters on the security of system, we obtain the exact closed-form expressions for secrecy outage probability (SOP) under linear EH (LEH), saturation nonlinear EH (SNEH) and saturation nonlinear EH with activation threshold (SNAT), respectively, and solve the maximization problem of secure energy efficiency (SEE). Simulation results demonstrate that: (1) the number of source sensors, the EH efficiency and the transmit power of power beacon (PB) all have positive impact on SOP, and the smaller generalized selection coefficient is advantageous for secrecy performance; (2) LEH is an ideal situation for SNEH when the saturation threshold is large enough and SNEH is a special situation for SNAT when the activation threshold is low enough; (3) the time-switching factor and the activation threshold both have an important impact on the secrecy performance, which are worth considering carefully.
机译:在本文中,我们将从物理层安全性(PLS)的角度研究饱和非线性能量收集(EH)和激活阈值对多用户无线传感器网络(WPSN)的影响。特别地,为了提高保密性能,利用了通用多用户调度(GMS)方案,其中基于合法链路选择最强传感器。为了评估各种关键参数对系统安全性的影响,我们获得了线性EH(LEH),饱和非线性EH(SNEH)和具有激活阈值的饱和非线性EH下的保密中断概率(SOP)的精确闭式表达式。 SNAT)分别解决安全能效(SEE)最大化的问题。仿真结果表明:(1)源传感器的数量,EH效率和功率信标(PB)的发射功率均对SOP有积极影响,较小的广义选择系数有利于保密性能。 (2)当激活阈值足够低时,LEH是SNEH的理想情况,而SNEH是SNAT的特殊情况。 (3)时间转换因子和激活阈值都对保密性能有重要影响,值得仔细考虑。

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