硬件损伤下多窃听器NOMA系统平均保密容量分析  

Average Secrecy Capacity Analysis of NOMA System with Multiple Eavesdroppers Under Hardware Impairments

作　　者：何安苏 虞湘宾[1,2] 周玥 HE Ansu;YU Xiangbin;ZHOU Yue(College of Electronic and Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,P.R.China;Key Laboratory of Wireless Sensor Network and Communication,Chinese Academy of Sciences,Shanghai 200050,P.R.China)

机构地区：[1]南京航空航天大学电子信息工程学院,中国南京211106 [2]中国科学院无线传感器网络与通信重点实验室,中国上海200050

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2024年第2期244-252,共9页南京航空航天大学学报（英文版）

基　　金：supported in part by the National Natrual Science Foundation of China(Nos.61971220,61971221);the Open Research Fund Key Laboratory of Wireless Sensor Network and Communication of Chinese Academy of Science(No.2017006).

摘　　要：研究了非正交多址(Non‑orthogonal‑multiple‑access,NOMA)接入通信系统的物理层安全性能。当基站采用下行NOMA方案发送信息时,由于信道的开放性,信息容易被窃听,而当存在多个随机分布的窃听者时,安全性能会进一步降低。为了增强存在硬件损伤系统的物理层安全性能,本文考虑保护区的方法,针对地面用户与基站之间存在直连链路的情况,采用莱斯衰落来建模小尺度衰落。本文还假设多个窃听者的位置遵循齐次泊松点过程(Homogeneous Poisson point process,HPPP),借助高斯切比雪夫积分公式,推导了平均保密容量的闭式表达式,并给出了在高信噪比情况下的渐近表达式来获得进一步见解。仿真结果验证了保护区方法在增强安全性能方面的有效性,并说明了不同参数对系统保密性能的影响。This paper studies the physical layer security performance of non-orthogonal-multiple-access(NOMA)communication system.When the base station incorporates the down-link NOMA scheme to send information,due to the openness of the channel,the information is easy to be eavesdropped,and when there are multiple randomly distributed eavesdroppers,the security performance will be further reduced.In order to enhance physical layer security performance of the system with hardware impairments,we take the method named Protected Zone into account.Based on the characteristics of the direct link between ground users and base station,we apply the Rician fading to model small-scale fading.We also assume the locations of multiple eavesdroppers follow homogeneous Poisson point process(HPPP).The closed-form expressions of average secrecy capacity are derived with the help of Gaussian-Chebyshev quadrature,and the asymptotic expressions are also provided for obtaining the insight under high signal-tonoise-ratio cases.The simulation results verify the effectiveness of the protected zone method for enhancing the security performance,and also illustrate the impact of different parameters on the secrecy performance of the system.

关 键 词：平均保密容量 非正交多址 硬件损伤 莱斯衰落 物理层安全 

分 类 号：TN929.5[电子电信—通信与信息系统]