电子学报

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γ约束均方误差下的无线信道加密方法

罗文宇, 金梁, 黄开枝, 钟州   

  1. 信息工程大学信息技术研究所, 河南郑州 450002
  • 收稿日期:2011-05-09 修回日期:2012-02-23 出版日期:2012-07-25
    • 作者简介:
    • 罗文宇 男.1982年9月出生,河南正阳人.解放军信息工程大学博士生,从事物理层安全、软件无线电、超宽带等方向的研究. E-mail:lwy_xd@163.com金 梁 男.1969年4月出生,北京人.解放军信息工程大学教授、博士生导师.1999年毕业于西安交通大学,获博士学位.从事数字通信、通信中的数字信号处理等方面的研究.
    • 基金资助:
    • 国家自然科学基金 (No.61171108); 信息工程大学博士研究生学位论文创新基金 (No.BSLWCX201102)

A Wireless Channel Encryption Method with γ Mean Square Error

LUO Wen-yu, JIN Liang, HUANG Kai-zhi, ZHONG Zhou   

  1. Institute of Information Technology, Information Engineering University, Zhengzhou, Henan 450002, China
  • Received:2011-05-09 Revised:2012-02-23 Online:2012-07-25 Published:2012-07-25
    • Supported by:
    • National Natural Science Foundation of China (No.61171108); Doctoral Dissertation Innovation Fund of Information Engineering University (No.BSLWCX201102)

摘要: 无线信道的开放性和电磁信号的广播特性对无线通信系统的安全提出了极大挑战.无线信道引入的安全问题还需要从无线信道本身加以根本解决.现有基于无线信道的物理层安全方法大多利用了多天线带来的空间冗余,无法应用于单天线点对点的场景.为此,本文首先提出了γ约束均方误差的概念,通过放宽授权用户的最佳线性接收条件在发送端引入预编码权值的冗余.在此基础上将物理层安全问题转变为发送信号随机化问题,并给出了具体分析和相应的理论推导.然后利用无线信道特征的短期可逆性、快速去相关性提出一种全新的物理层加密方法.分析和仿真结果表明,该方法在保证授权用户无条件正常接收的同时大大降低了信号被非法用户截获的概率.

关键词: 物理层安全, 无线信道, 低截获概率, γ约束均方误差

Abstract: The design of secure wireless communication suffers a great challenge for openness of wireless channel and the broadcast nature of radio signals.The security problem introduced by wireless channel may be solved adequately by wireless channel itself.The space redundancy is often used in existing physical-layer security method to enhance security.So the concept of γ mean square error is proposed in the paper,which is used to introduce redundancy for pre-coding weight.The concrete analysis and corresponding formal derivations are also given in the paper.Based on these,a novel physical-layer encryption method is proposed according to short-term reciprocity,rapid Decorrelation of wireless channel.Simulation results show that the proposed method guarantees wireless transmission in the authorized receiver and reduces the probability of interception.

Key words: physical-layer security, wireless channel, low probability of interception, γ mean square error

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