混合窃听环境下多波束符号级安全传输方法  

Multi-beam symbol-level secure transmission against hybrid eavesdropping

作　　者：邱彬 程文驰[1] Bin QIU;Wenchi CHENG(The State Key Laboratory of Integrated Services Networks,Xidian University,Xi’an 710071,China)

机构地区：[1]西安电子科技大学综合业务网理论与关键技术国家重点实验室,西安710071

出　　处：《中国科学：信息科学》2022年第2期217-238,共22页Scientia Sinica(Informationis)

基　　金：国家重点研发计划(批准号:2021YFC3002100)资助项目。

摘　　要：针对毫米波在混合窃听无线通信系统面临的安全问题,基于阵列收发结构,提出了一种有效的无线物理层安全传输方法.在发射端采用多波束符号级方向调制、人工噪声(artificial noise,AN)辅助、天线子集方法,以及合法用户(legitimate user,LU)采用阵列接收确保混合窃听环境下的安全可靠传输.考虑窃听者(eavesdropper,Eve)信息未知,通过最小化发射信息功率准则设计发射波束形成矢量,满足合法用户的接收信号指定符号级约束,确保合法用户有效接收.将剩余的发射功率分配给人工噪声,最大限度扰乱窃听者的接收信号.此外,通过最小均方差无失真响应准则设计合法用户接收权矢量,有效抑制干扰信号.仿真结果证明了所提方法在能量效率和安全增强方面的优越性.In this paper,we consider a physical layer security(PLS)problem for a hybrid wiretapping wireless system in millimeter-wave transmission,where the active eavesdropper and passive eavesdropper(Eve)may coexist to intercept the confidential messages and emit jamming signals.To achieve secure and reliable transmission,we propose a switched phased-array directional modulation(DM)scheme that employs multi-beam symbollevel precoding with aided artificial noise(AN)technique at the transmitter,and array reception at legitimate users(LU).Here we consider a more practical case that the information of the eavesdropper(Eve)is unknown by the transmitter.Leveraging DM beamforming,we aim to minimize transmit message power by optimizing the beamforming vector,subject to prescribed symbol-level constraints,thus generating exact/relaxed phases at LU.The remaining transmit power can be utilized to generate AN.Additionally,by means of the minimum variance distortionless response method at the LU,the jamming caused by active Eve can be efficiently eliminated.Simulation results demonstrate the superiority of the proposed scheme.

关 键 词：物理层安全 人工噪声 混合窃听 多波束 方向调制 

分 类 号：TN918[电子电信—通信与信息系统]