窃听者随机分布SWIPT-NOMA系统的物理层安全

doi:10.11959/j.issn.1000-0801.2022059

摘要/Abstract

摘要：

非正交多址接入（non-orthogonal multiple access，NOMA）与无线携能通信（simultaneous wireless information and power transfer，SWIPT）技术的组合可提高无线系统的频谱效率，并能够解决用户节点的电能供应问题。然而，当能量收集器要恶意窃听基站发送的机密信息时，SWIPT-NOMA系统的信息安全传输会受到威胁，为增强其物理层安全（physical layer security，PLS）性能，提出了一种采用发射天线选择和功率分割策略的SWIPT-NOMA系统PLS模型。如果各能量收集器的空间位置随机分布服从泊松点过程，利用空间泊松分布生成函数推导SWIPT-NOMA系统的安全中断概率和非零安全容量概率近似表达式。数值计算与仿真结果表明，所推导的表达式具有很高的准确性，且可用于研究窃听者密度、基站与远近端信息接收者之间的距离、基站发射天线数以及功率分割因子等参数对SWIPT-NOMA系统PLS性能的影响。

关键词: 非正交多址接入, 无线携能通信, 物理层安全, 泊松点过程, 安全中断概率

Abstract:

The combination of non-orthogonal multiple access (NOMA) and simultaneous wireless information and power transfer (SWIPT) technologies can improve spectrum efficiency of wireless system and solve the power supply problem of user nodes.However, when energy-harvesting receivers want to maliciously eavesdrop on confidential information sent by the base station, the information security transmission of SWIPT-NOMA system will be threatened.To enhance its physical layer security (PLS) performance, the PLS model of SWIPT-NOMA system with transmit antenna selection and power split strategies was proposed.When the spatial location randomly distributed energy-harvesting receivers obey the Poisson point process, the approximate expressions for the secrecy outage probability and non-zero secrecy capacity probability of SWIPT-NOMA system were derived by using the spatial Poisson probability generation function.Numerical and simulation results verify the accuracy of the expressions.The above expressions can also be used to study the influence of eavesdropper density, the distance between the base station and the far and near information receivers, the number of transmitting antennas and the power split factor on PLS performance of SWIPT-NOMA system.

Key words: non-orthogonal multiple access, simultaneous wireless information and power transfer, physical layer security, Poisson point process, secrecy outage probability

中图分类号:

TN918.1

丁一凡, 李光球, 李辉. 窃听者随机分布SWIPT-NOMA系统的物理层安全[J]. 电信科学, 2022, 38(3): 133-142.

Yifan DING, Guangqiu LI, Hui LI. Physical layer security for SWIPT-NOMA system in presence of randomly located eavesdroppers[J]. Telecommunications Science, 2022, 38(3): 133-142.

图/表 6

图1

表1

TAS和PS策略下SWIPT-NOMA系统的仿真参数设置"

参数名称	参数值
S的功率分配系数α₁、α₂	0.1、0.9
S与IR1之间的距离d₁	5m
S与IR2之间的距离d₂=2d₁	10 m
平均信噪比 ${\bar{γ}}_{1}$	30 dB
式（30）、式（37）中展开式项数N	100
功率分割因子β_k =β	0.5
ER分布半径R	50 m
ER泊松分布密度ρ_E	0.01/m²
窃听链路平均信噪比 ${\bar{γ}}_{E}$	30 dB
路径损耗指数α	4
目标安全速率R_S	1 bit/(s·Hz)

表1

图2

图3

图4

图5

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