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联合信道均衡与时间反演的室内保密通信方法
朱江,丁强
0
(重庆邮电大学 通信与信息工程学院,重庆 400065)
摘要:
针对物理层无线通信的窃听信道问题,提出了一种适用于室内频率选择性衰落信道的均衡时间反演(Equalized Time Reversal,ETR)保密通信方法。首先,建立了均衡时间反演窃听模型,在信号发送端将均衡器级联配置,利用信道均衡技术提高信息传输的保密性能;其次,通过传统时间反演(Time Reversal,TR)技术的等效信道分析对均衡器进行了设计,根据均衡后的信道推导了系统保密信干噪比、系统保密容量、误码率的闭合表达式。理论分析和仿真结果表明,与传统的TR技术相比,ETR的保密信干噪比、系统保密容量更高,合法接收用户的误码率更低。
关键词:  室内保密通信  窃听信道  时间反演  信道均衡  保密性能
DOI:
基金项目:国家自然科学基金资助项目(6171084,61102062,61271260)
An indoor secret communication method jointing channel equalization and time reversal technique
ZHU Jiang,DING Qiang
(School of Communication and Information Engineering,Chonqing University of Posts and Telecommunications,Chongqing 400065,China)
Abstract:
To deal with the issues of eavesdropping channel in physical layer wireless communication,an equalized time reversal(ETR) secret communication method is proposed for indoor frequency selective fading channel.Firstly,the ETR eavesdropping model is established.The equalizer is cascaded at the signal transmitting end,and the channel equalization technology is used to improve the security performance of information transmission.Secondly,the equalizer is designed by the equivalent channel analysis of the traditional time reversal(TR) technique.The closed expression of the system secret signal to interference plus noise ratio(SINR),system security capacity and bit error rate(BER) is derived based on the equalized channel.Theoretical analysis and simulation results show that compared with the traditional TR technology,ETR′s secrecy SINR ratio and system security capacity are higher,and the legal receiver user′s BER is lower.
Key words:  indoor secret communication  eavesdropping channel  time reversal  channel equalization  security performance
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