随机位置窃听场景下SWIPT系统的物理层安全性能

doi:10.11959/j.issn.1000-0801.2020147

摘要/Abstract

摘要：

鉴于窃听者的位置会对采用发射天线选择（TAS）和功率分割（PS）策略的无线携能通信（SWIPT）系统的物理层安全性能产生严重影响，考虑将其建模为泊松点过程（PPP）。利用PPP的概率生成函数分别推导了采用TAS和PS策略的SWIPT系统在非合谋（独立）与合谋两种窃听场景下的安全中断概率（SOP）闭合表达式。数值计算和仿真结果均表明，发射天线数越大，发射端与信息接收者之间的距离越小，PS因子越小，SWIPT系统在非合谋与合谋两种窃听场景下的SOP均越小；合谋窃听会进一步恶化SWIPT系统的物理层安全性能。

关键词: 物理层安全, 无线携能通信, 泊松点过程, 功率分割, 发射天线选择, 安全中断概率

Abstract:

The locations of the eavesdroppers have serious impact on the physical layer security performance of simultaneous wireless information and power transfer (SWIPT) systems with transmit antenna selection (TAS) and power split (PS) strategy,which can be considered to be modeled as Poisson point process (PPP).The closed-form expressions for secrecy outage probability (SOP) of SWIPT system with TAS and PS strategy under non-colluding and colluding eavesdropping scenarios were derived by using probability generation function of PPP,respectively.Numerical and simulation results show that,the larger the number of transmit antennas,the smaller the distance between the transmitter and the information receiver,and the smaller the PS factor,the smaller SOP of SWIPT system under non-colluding and colluding eavesdropping scenarios.Colluding eavesdropping will further deteriorate the physical layer security performance of SWIPT systems.

Key words: physical layer security, simultaneous wireless information and power transfer, Poisson point process,power split, transmit antenna selection, secrecy outage probability

中图分类号:

TN918.1

钱辉,李光球,丁一凡. 随机位置窃听场景下SWIPT系统的物理层安全性能[J]. 电信科学, 2020, 36(5): 65-72.

Hui QIAN,Guangqiu LI,Yifan DING. Physical layer security performance of SWIPT system in the presence of randomly located eavesdroppers[J]. Telecommunications Science, 2020, 36(5): 65-72.

图/表 6

图1

表1

PS接收策略下SWIPT系统的参数设置"

参数名称	参数值
噪声方差N0′	1
发射端输出信噪比 $\bar{γ} / d B$	30
路径损耗指数α	4
ER分布半径R/m	50
功率分割因子β	0.5
目标安全速率R_S/( bit.(s.Hz)^-1)	1
Alice与IR之间的距离d_I/m	10

表1

图2

图3

图4

图5

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