基于信道弱特征随机加扰的宽带系统物理层加密算法

doi:10.3969/j.issn.0255-8297.2013.03.003

应用科学学报 ›› 2013, Vol. 31 ›› Issue (3): 233-238.doi: 10.3969/j.issn.0255-8297.2013.03.003

基于信道弱特征随机加扰的宽带系统物理层加密算法

庞宏伟，金梁，黄开枝，吉江

国家数字交换系统工程技术研究中心，郑州450002

收稿日期:2012-02-18 修回日期:2012-04-13 出版日期:2013-05-28 发布日期:2012-04-13
作者简介:金梁，教授，博导，研究方向：移动无线通信，E-mail：panghw05@163.com
基金资助:
国家自然科学基金(No.61171108)；国家“863”高技术研究发展计划基金(No.2009AA011202, No.2009AA011205)；国家科技重大专项基金(No.2009ZX03006-007)资助

Physical Layer Secrecy of Wideband System by Adding Random Noise Based on Channel’s Weak Characteristics

PANG Hong-wei, JIN Liang, HUANG Kai-zhi, JI Jiang

National Digital Switching System Engineering & Technological Research Center, Zhengzhou 450002, China

Received:2012-02-18 Revised:2012-04-13 Online:2013-05-28 Published:2012-04-13

摘要/Abstract

摘要： 针对无线宽带系统面临的窃听问题，提出一种基于信道时域弱特征随机加扰的物理层加密算法. 发送用户利用特征值分解将非奇异的授权用户信道特征矩阵分解成多个并联子信道，然后选择具有强特征的子信道发送有用信息，将具有弱特征的子信道转化为快时变信道，使授权用户接收信号趋于稳定，窃听用户接收信号质量恶化. 仿真结果表明，该算法通过特征选取可降低对授权用户的信道要求，同时降低窃听用户的SINR使窃听保持较高的误码率，从而提高系统安全性.

关键词: 物理层安全, 无线宽带系统, 信道时域弱特征, 保密容量, 矩阵分解

Abstract: To combat wiretapping of wireless wideband system, this paper presents a method for wireless wideband system physical layer secrecy in the time domain. The method adds random noise based on weak channel characteristic. First, the transmitter decomposes the nonsingular channel characteristic matrix into
some sub-channels. The sub-channels with strong characteristic are selected to transmit useful information, and weak ones are transformed into a random channel. The signal received by legitimate receivers becomes steady, while the eavesdropper’s turns random. Simulation results show that the method can lower the requirements to the legitimate channel state while decrease SINR at eavesdroppers to keep its error probability high so as to enhance system security.

Key words: physical layer security, wireless wideband system, channel weak characteristic in time domain, secrecy capacity, matrix decomposition

中图分类号:

TN929.53

庞宏伟，金梁，黄开枝，吉江. 基于信道弱特征随机加扰的宽带系统物理层加密算法[J]. 应用科学学报, 2013, 31(3): 233-238.

PANG Hong-wei, JIN Liang, HUANG Kai-zhi, JI Jiang. Physical Layer Secrecy of Wideband System by Adding Random Noise Based on Channel’s Weak Characteristics[J]. Journal of Applied Sciences, 2013, 31(3): 233-238.

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基于信道弱特征随机加扰的宽带系统物理层加密算法

Physical Layer Secrecy of Wideband System by Adding Random Noise Based on Channel’s Weak Characteristics

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