自适应窃听下NOMA用户协作干扰的物理层安全研究

在存在一个半双工自适应窃听者的通信模型中,分析了采用非正交多址(Non-orthogonal Multiple Access,NOMA)技术合作系统的性能。提出了一种新型的合作NOMA方案,该方案在中继转发时,强用户可充当中继协助转发弱用户信号,而弱用户采用全双工技术向窃听者发送干扰信号,提高了通信链路的安全性和用户的服务质量。合法接收端采用连续干扰消除(SIC)技术,以解码来自叠加信号的各个消息。在已知窃听信道统计信道状态信息(CSI)的情况下,分别推导了2个用户的安全中断概率和中断概率的闭合表达式,并通过Monte-Carlo仿真验证。理论分析和数值模拟结果均表明所提出的NOMA用户合作方案在保密率方面优于非合作方案的性能。

Research on Physical Layer Security of NOMA User Collaboration Interference with Adaptive Eavesdropping

The performance of NOMA users collaboration interference communication system is analyzed,where there exists a half-duplex adaptive eavesdropper.A new cooperative NOMA scheme is proposed,in which strong users can act as relays to assist weak users in forwarding signals,while weak users make use of full-duplex technology to send interference signals to the eavesdropping,which improves the security of communication links and the quality-of-service(QoS).The legitimate receiver decodes various news from the superposition signal via successive interference elimination(SIC)technology.The closed expressions of the security interrupt probability and interrupt probability of two users are derived respectively under the condition that the wiretap channel statistics channel state information(CSI)is known,and it is verified by Monte-Carlo simulation.Both theoretical analysis and numerical simulations show that the performances of NOMA user cooperation scheme is better than the non-cooperative solution.