信道估计误差对物理层安全加密方案的影响  

Influence of Channel Estimation Error on Physical Layer Security Encryption Scheme

作　　者：奚晨婧 高媛媛 沙楠 XI Chenjing;GAO Yuanyuan;SHA Nan(School of Communications Engineering,Army Engineering University of PLA,Nanjing 210007,China)

机构地区：[1]陆军工程大学通信工程学院,南京210007

出　　处：《计算机工程》2020年第6期122-129,共8页Computer Engineering

基　　金：国家自然科学基金(61501511)。

摘　　要：为在物理层中进行信息安全传输,提出一种基于星座模糊的物理层加密方案。将信道系数作为密钥,采用信道系数与已调符号矢量叠加的方式实现加密。考虑信道估计存在误差的实际情况,分析信道估计误差对星座模糊加密方案性能的影响,推导带有相位估计误差的接收端误码率理论公式。仿真结果表明,该方案能实现保密通信,且其系统对信道相位误差具有一定的容忍度,信道相位误差在15°内时系统具有鲁棒性,但误差大于42°时系统误码率为1。In order to safely transmit information in the physical layer,this paper proposes a physical layer encryption scheme based on constellation obfuscation.The channel coefficient is used as the key and superimposed with the modulated symbol vector to achieve encryption.Considering the actual situation of channel estimation error,this paper analyzes the influence of channel estimation error on the performance of constellation obfuscation encryption scheme and conducts the theoretical formula of bit error rate of receiver with phase estimation error.Simulation results show that the proposed scheme can achieve secure communication and it has certain tolerance for the channel phase error.The system is robust when the channel phase error is with 15°,but when the error exceeds 42°,the system bit error rate is 1.

关 键 词：物理层安全 物理层加密 星座模糊 信道估计误差 调制 星座映射 

分 类 号：TP918.9[自动化与计算机技术]