基于同频同时全双工自干扰消除的有线保密通信系统  

Wire-line Secure Communication System Based on CCFD Self-interference Cancellation

作　　者：陆文健 刘三军 来国红 LU Wen-jain;LIU San-jun;LAI Guo-hong(College of Information Engineering,Hubei Minzu University,Enshi 445000,China;College of Physical Science and Technology,Central China Normal University,Wuhan 430070,China)

机构地区：[1]湖北民族大学信息工程学院,恩施445000 [2]华中师范大学物理科学与技术学院,武汉430070

出　　处：《科学技术与工程》2023年第24期10379-10386,共8页Science Technology and Engineering

基　　金：国家自然科学基金(61961016);湖北省自然科学基金(2019CFB593);湖北民族大学博士科研启动基金(MY2018B08);湖北民族大学研究生教育创新计划(DC200000119)。

摘　　要：针对目前有线全双工通信系统中保密通信技术尚未成熟,在保密性能存在局限性,以同频同时全双工(co-frequency co-time full duplex,CCFD)系统的自干扰(self-interference,SI)消除理论为基础,提出一种物理层绝对安全的有线保密通信系统设计方案,通过巧妙地在接收端向链路中释放同时同频大功率人造噪声的方式将目标信号隐藏起来,再利用接收机对噪声信号的已知性,借助CCFD系统的模拟域自干扰消除技术在接收机中实现高dB的SI消除,实现Wyner意义上的绝对安全的保密通信。依据香农理论分析了延迟时间差、窃听位置、传输线长度等因素对SI消除能力和系统安全容量的影响。结果表明:系统的安全容量始终大于零,达到绝对保密通信效果。For the current wired full duplex communication system in the confidential communication technology has not matured,in the confidentiality performance there are limitations.A design scheme of the wired secure communication system with absolute security in the physical layer was proposed based on the self-interference(SI) cancellation theory of the co-frequency co-time full duplex(CCFD) system.The target signal was hidden by skillfully releasing simultaneous same-frequency high-power artificial noise into the link at the receiver end,and then the receiver's known noise signal was used to achieve high dB SI cancellation in the receiver with the help of the analog domain SI cancellation technology of the CCFD system to achieve absolutely secure and confidential communication in the Wyner sense.The effects of delay time difference,eavesdropping location,transmission line length and other factors on SI cancellation capability and system security capacity were analyzed based on Shannon theory.The results show that the security capacity of the system is always greater than zero,achieving the effect of absolute confidential communication.

关 键 词：同频同时全双工(CCFD) 物理层安全 人工噪声 自干扰(SI)消除 安全容量 有线通信 

分 类 号：TN918[电子电信—通信与信息系统]