多天线中继系统中基于无线携能通信的物理层安全传输方案  

Physical layer security transmission schemes based on simultaneous wireless information and power transfer for multi-antenna relay systems

作　　者：张广大 任清华[1,2] 樊志凯 ZHANG Guangda;REN Qinghua;FAN Zhikai(Information and Navigation College,Air Force Engineering University,Xi’an 710077,China;Key Laboratory of Aerospace Information Applications,China Electronics Technology Group,Shijiazhuang 050081,China)

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077 [2]中国电子科技集团公司航天信息应用技术重点实验室,河北石家庄050081

出　　处：《系统工程与电子技术》2023年第6期1856-1865,共10页Systems Engineering and Electronics

基　　金：国家重点实验室合作基金(kx162600022)资助课题。

摘　　要：针对多天线协作中继系统中存在信号处理能量受限和保密信息安全传输的问题和挑战,提出了一种基于无线携能通信和友好干扰信号辅助的两阶段物理层安全传输方案。首先,建立了基于放大转发中继模式的多天线中继系统模型。其次,考虑多窃听者非合谋窃听的场景,分析了系统能量与信息的传输过程,以最大化系统保密性能为目标,分别提出了最优传输天线选择策略和基于Q学习(Q-learning)算法的最优干扰天线选择策略。接着,推导出系统遍历可达保密速率(ergodic achievable secrecy rate, EASR)的表达式。最后,利用蒙特卡罗仿真方法验证了理论推导的正确性,并讨论了发射信噪比、功率分裂(power splitting, PS)因子及功率分配系数等参数对系统保密性能的影响。仿真结果表明,所提出的传输方案相比现有的安全传输方案,系统保密性能有较大的提升。The two-stage physical layer security transmission scheme based on simultaneous wireless information and power transfer and friendly jamming signals aided is proposed to solve the energy-constrained problem of signal processing and secure transmission issues of confidential information upon the multi-antenna relay systems.Firstly,a multi-antenna relay system model based on the amplify-and-forward relay protocol is established.Secondly,considering the scenario of multiple eavesdroppers and non-collusion eavesdropping,and with the analysis of the transmission process of system energy and information,the optimal transmission antenna selection strategy and the optimal jamming antenna selection strategy based on Q-learning algorithm are respectively proposed in order to maximize the secrecy performance of the system.Thirdly,the expressions of the system’s ergodic achievable secrecy rate are derived.Finally,the Monte Carlo simulation method is applied to verify the correctness of the theoretical derivation,and the influence of parameters such as the transmit signal-to-noise ratio,power splitting factor(PS),and power allocation coefficient on the secrecy performance of the system is analyzed.The simulation results show that the proposed transmission scheme outperforms compared with the existing security transmission scheme.

关 键 词：物理层安全 协作中继 无线携能通信 Q学习 功率分裂 遍历可达保密速率 

分 类 号：TN918.91[电子电信—通信与信息系统]