电子学报 ›› 2021, Vol. 49 ›› Issue (9): 1736-1745.DOI: 10.12263/DZXB.20200585

• 学术论文 • 上一篇    下一篇

多天线预均衡时间反转安全传输系统中预均衡器的优化

雷维嘉1,2, 张维翰1,2, 谢显中3, 雷宏江1,2   

  1. 1.重庆邮电大学通信与信息工程学院, 重庆 400065
    2.移动通信技术重庆市重点实验室, 重庆 400065
    3.重庆邮电大学光电工程学院, 重庆 400065
  • 收稿日期:2020-06-17 修回日期:2021-02-02 出版日期:2021-09-25 发布日期:2021-09-25
  • 作者简介:雷维嘉 男,1969年出生,云南元谋人,博士,教授,主要从事无线和移动通信技术的研究.E-mail:leiwj@cqupt.edu.cn
    张维翰 男,1995年出生,重庆奉节人,硕士研究生,主要从事物理层安全的研究.E-mail:15025437683@163.com
    谢显中 男,1966年出生,四川通江人,博士,教授,主要从事无线和移动通信技术的研究.E-mail:xiexzh@cqupt.edu.cn
    雷宏江 男,1975年出生,陕西合阳人,博士,教授,主要从事无线通信系统建模与分析、物理层安全的研究.E-mail:leihj@cqupt.edu.cn
  • 基金资助:
    国家自然科学基金(61971080);重庆市教委科学技术研究重点项目(KJZD-K201800603)

Optimization of Pre-equalizer in Multiple Antenna Pre-equalized Time Reversal Secure Transmission System

Wei-jia LEI1,2, Wei-han ZHANG1,2, Xian-zhong XIE3, Hong-jiang LEI1,2   

  1. 1.School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China
    2.Chongqing Key Laboratory of Mobile Communications Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,China
    3.School of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China
  • Received:2020-06-17 Revised:2021-02-02 Online:2021-09-25 Published:2021-09-25

摘要:

时间反转传输技术通过利用多径传输实现信号能量在空间和时间上的聚集,具有天然的抗窃听特性.本文在多输入单输出(Mingle-Input Single-Output,MISO)时间反转物理层安全传输系统中,在常规的发送预滤波器前增加一个所有天线共用的预均衡器,并针对保密速率最大化进行优化.相比较联合优化所有预滤波器的方案,优化预均衡器的复杂度明显更低.仿真结果表明,针对安全传输优化的预均衡时间反转系统,在配备4根发送天线、上采样因子为1时高发送功率下的可达保密速率比常规时间反转传输系统约高2倍,且天线数目越多,上采样因子越大,性能优势越明显.

关键词: 物理层安全, 时间反转, 预均衡, 多输入单输出

Abstract:

By using the multi-path of wireless channels, time reversal (TR) transmission technology can focus the signal energy in a desired spatial and temporal point, so it has natural anti-eavesdropping capability. In this paper, a pre-equalizer shared by all antennas is added in front of the conventional pre-filters at the transmitter for a TR multiple-input single-output system. The optimization of the pre-equalizer is carried out for the maximization of secrecy rate. Compared with the joint optimization for the all pre-filters, the complexity of optimization for the pre-equalizer is significantly lower. The simulation results show that the security rate of the pre-equalized TR system optimized for secure transmission is about two times higher than that of the conventional TR transmission system at high transmission power with four transmitting antennas and one up sampling factor. And the more the number of antennas, the larger the up sampling factor, the more obvious the performance advantage.

Key words: physical layer security, time reversal, pre-equalization, mingle-input single-output

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