基于IRS辅助的NOMA系统抗内部窃听的安全设计  

Security design of NOMA system against internal near-end eavesdropping based on IRS

作　　者：贺鑫锐 吉小鹏 陈妍秋 HE Xin-rui;JI Xiao-peng;CHEN Yan-qiu(School of Electronics and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044

出　　处：《计算机工程与设计》2024年第10期2897-2904,共8页Computer Engineering and Design

基　　金：国家自然科学基金项目(62072250);国家重点研发计划基金项目(2021QY0700);南京信息工程大学引进人才科研启动经费基金项目(2021r039)。

摘　　要：针对NOMA系统的物理层安全性开展研究,考虑IRS协助的单用户簇NOMA系统模型下,不受信任的内部近端用户尝试窃取远端用户的信息的场景,提出一种基于IRS和人工噪声辅助的对抗内部窃听的安全传输方案,提高系统的保密速率,降低保密通信中断概率。提出一种联合波束成形、IRS反射相位和功率分配系数的交替优化算法。通过数值仿真分析验证了算法的有效性,提高了系统的保密性能。The study on the physical layer security of NOMA system considers the worst case of eavesdropping under the IRS-assisted single-user cluster NOMA system model,that is,the untrusted internal near-end user tries to steal the information of the far-end user.For single-user cluster NOMA systems,a secure transmission scheme against internal eavesdropping based on IRS and artificial noise was proposed,which effectively improved the system’s secrecy rate and reduced the probability of secure communication interruption.And an alternating optimization algorithm for joint beamforming,IRS reflection phase,and power allocation coefficients was proposed.The effectiveness of the algorithm is demonstrated through numerical simulation analysis,which improves the system’s secrecy performance.

关 键 词：智能反射面 非正交多址 人工噪声 物理层安全 内部窃听 优化算法 保密通信 

分 类 号：TN918.91[电子电信—通信与信息系统]