NOMA-D2D协作无线系统的物理层安全

doi:10.11959/j.issn.1000-0801.2022171

摘要/Abstract

摘要：

针对未来海量用户设备接入的物理层安全（physical layer security，PLS）应用需求，提出了一种组合非正交多址接入（non-orthogonal multiple access，NOMA）、终端直通（device-to-device，D2D）与中继协作的NOMA-D2D协作无线系统PLS模型。该模型由采用发射天线选择（transmit antenna selection，TAS）的基站、分别作为基站和D2D发射端的NOMA远端蜂窝用户、D2D接收端以及被动窃听者组成，其中的D2D发射端承担基站的 NOMA 近端用户和解码转发中继两种角色。利用高斯—切比雪夫正交定理推导两种 TAS 方案下NOMA-D2D协作无线系统的安全中断概率、非零安全容量概率以及渐近安全中断概率的近似表达式。数值计算和仿真实验验证了NOMA-D2D协作无线系统PLS性能分析的准确性；在基站总功率恒定时增大分配给远端蜂窝用户的功率能有效提升NOMA-D2D协作无线系统的PLS性能。

关键词: 非正交多址接入, 终端直通, 发射天线选择, 物理层安全, 安全中断概率

Abstract:

Aiming at the physical layer security (PLS) application requirement of massive user equipments access in the future, the PLS model combining with non-orthogonal multiple access (NOMA), device-to-device (D2D) and relay cooperation was proposed.The model was composed of base station with transmit antenna selection (TAS), NOMA far cellular user of base station and D2D transmitter, D2D receiver and passive eavesdropper, the D2D transmitter was also assumed two roles of NOMA near user of base station and decode-and-forward relay.The approximate expressions for the secrecy outage probability, non-zero secrecy capacity probability and asymptotic secrecy outage probability of NOMA-D2D cooperative wireless system under two TAS schemes were derived by using Gaussian-Chebyshev Quadrature theorem.Numerical and simulation results verify the accuracy of PLS performance analysis of NOMA-D2D cooperative wireless system.The results also show that increasing the power allocated to far cellular user under constant total power of base station can effectively improve PLS performance of NOMA-D2D cooperative wireless system.

Key words: non-orthogonal multiple access, device-to-device, transmit antenna selection, physical layer security, secrecy outage probability

中图分类号:

TN918.1

丁一凡, 李光球, 李辉. NOMA-D2D协作无线系统的物理层安全[J]. 电信科学, 2022, 38(9): 83-94.

Yifan DING, Guangqiu LI, Hui LI. Physical layer security of NOMA-D2D cooperative wireless system[J]. Telecommunications Science, 2022, 38(9): 83-94.

图/表 8

图1

图2

表1

NOMA-D2D协作无线系统的仿真参数"

参数名称	变量名	参数值	参数说明
发射天线数	M	4	图2~图6
S的功率分配系数	a ₁、a₂	0.2、0.8	图2~图4、图6~图7
DT的功率分配系数	b ₁、b₂	0.2、0.8	图2~图3、图5~图7
直传链路平均信噪比/dB	${\bar{γ}}_{S}$	20	图5
窃听链路平均信噪比/dB	${\bar{γ}}_{E}$	10	图2、图4~图6
目标安全速率/(bit·(s·Hz)^-1)	R ₁、R₂、R₃	0.1	图2~图4、图6~图7
式（10）、式（21）、式（32）中展开式项数	N	100	图2~图7

表1

图3

图4

图5

图6

图7

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