非联合多用户的物理层安全算法  

Physical Layer Security Scheme of Non-cooperation Multiuser System

作　　者：王浩川[1] 黄继海[1] 吉江[2] 

机构地区：[1]中州大学信息工程学院,河南郑州450044 [2]国家数字交换系统工程技术研究中心,河南郑州450002

出　　处：《电视技术》2014年第13期108-111,116,共5页Video Engineering

基　　金：国家自然科学基金项目(61171108)

摘　　要：为解决无线数字电视中多用户系统内部窃听者带来的安全威胁,提出针对多用户系统的接收非联合乘性干扰物理层安全算法。其思路是首先保证接收多用户处在非联合状态,提高用户接收的便利性。然后在对内部窃听者的接收信号进行抵消削弱的同时,引入乘性干扰对其接收质量进一步恶化。通过对接收端符号判决前后的安全性分析及仿真可知,提出的算法可以有效地提高系统安全传输速率,并且其安全性高于现有加性人工噪声方法。To prevent the reciprocal eavesdropping of internal user in multiuser system physical layer, a non-cooperative multiplieative interference se- curity method is presented in the paper. In this algorithm, the main direction of information transmission is extracted firstly. Then a multiplicative inter- ference with non-zero mean is added on the vertical direction of the main direction. The non-zero mean of this interference can cancel a great part of in- ternal eavesdroppers＇ received signal, and the randomness of the interference can disturb the internal eavesdroppers. The security before and after the receiver＇s symbol decision module is discussed and simulated. There is a conclusion that, comparing with the existing artificial noise scheme, the multi- plicative interference method can be safer.

关 键 词：多用户系统 物理层安全 内部窃听者 零空间 乘性干扰 

分 类 号：TN918[电子电信—通信与信息系统]