中继选择NOMA无线系统的物理层安全  

Physical layer security of relay selection NOMA wireless systems

作　　者：罗延翠 李光球[1] 叶明珠 高辉 张亚娟 LUO Yancui;LI Guangqiu;YE Mingzhu;GAO Hui;ZHANG Yajuan(Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]杭州电子科技大学,浙江杭州310018

出　　处：《电信科学》2024年第3期116-127,共12页Telecommunications Science

摘　　要：针对解码转发协作非正交多址接入(non-orthogonal multiple access,NOMA)系统物理层安全(physical layer security,PLS)性能较差,以及在多窃听者场景下PLS性能恶化的问题,提出了一种采用修改转发(modify-and-forward,MF)协议的多中继选择NOMA无线系统PLS模型。利用高斯-切比雪夫正交定理推导了非合谋或合谋窃听场景下多中继选择MF-NOMA无线系统的安全中断概率和渐近安全中断概率的近似表达式。仿真结果验证了多中继选择MF-NOMA无线系统PLS性能分析的准确性。结果同时也表明中继数目越多或窃听者数目越少,多中继选择MF-NOMA无线系统的PLS性能越好;合谋窃听比非合谋窃听更不利于多中继MF-NOMA无线系统的安全传输。Aiming at poor performance of physical layer security(PLS)of decode-and-forward cooperative non-orthogonal multiple access(NOMA)systems and its performance deterioration in the presence of multi-eavesdropper,the PLS model of multi-relay selection NOMA wireless systems using modify-and-forward(MF)protocol was pro‐posed.The approximate expressions of secrecy outage probability(SOP)and asymptotic SOP of multi-relay selection MF-NOMA wireless systems with non-colluding or colluding eavesdropping scenarios were derived by using Gauss-Chebyshev Quadrature theorem.The simulation results verify the accuracy of PLS performance analysis of the above MF-NOMA wireless systems.The results also indicate that the PLS performance of multi-relay selection MF-NOMA wireless systems will be improved when the number of relays increases or the number of eavesdroppers decreases,and that colluding eavesdropping is more detrimental to secure transmission of multi-relay MF-NOMA wireless sys‐tems than non-colluding eavesdropping.

关 键 词：非正交多址接入 修改转发 中继选择 物理层安全 安全中断概率 

分 类 号：TN918.1[电子电信—通信与信息系统]