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应用科学学报 ›› 2011, Vol. 29 ›› Issue (4): 368-373.doi: 10.3969/j.issn.0255-8297.2011.04.006

• 通信工程 • 上一篇    下一篇

切换天线发射的低截获率通信信号物理层安全传输

洪涛， 宋茂忠， 刘渝   

  1. 南京航空航天大学信息科学与技术学院，南京210016
  • 收稿日期:2010-12-13 修回日期:2011-04-03 出版日期:2011-07-30 发布日期:2011-07-30
  • 作者简介:作者简介：洪涛，博士生，研究方向：多天线系统、数字通信、调制技术，E-mail: hongtao@nuaa.edu.cn；宋茂忠，教授，博导，研究方 向：调制信号设计与接收、多天线通信跟踪定位综合化技术、卫星导航，E-mail: smz108@nuaa.edu.cn；刘渝，教授，博导，研 究方向：信号处理、信号检测与估计、电子侦察和电子智能化系统，E-mail: liuyu_nuaa@yahoo.com.cn
  • 基金资助:

    基金项目：江苏省自然科学基金(No.BK2009367)；航空基金(No.20095152026)资助

Signal Transmitted from Switched Antenna Array with Low Interception Probability for Physical Layer Security

HONG Tao, SONG Mao-zhong, LIU Yu   

  1. College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2010-12-13 Revised:2011-04-03 Online:2011-07-30 Published:2011-07-30
  • About author:作者简介：洪涛，博士生，研究方向：多天线系统、数字通信、调制技术，E-mail: hongtao@nuaa.edu.cn；宋茂忠，教授，博导，研究方 向：调制信号设计与接收、多天线通信跟踪定位综合化技术、卫星导航，E-mail: smz108@nuaa.edu.cn；刘渝，教授，博导，研 究方向：信号处理、信号检测与估计、电子侦察和电子智能化系统，E-mail: liuyu_nuaa@yahoo.com.cn

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被引次数

18

摘要：

 为了提高通信信号在无线传输过程中的物理层安全性，提出一种低截获率物理层安全通信信号. 发射机根据接收机发送的训练符号估计信道，并随机选取信道质量较好的天线加权发射信号. 各天线的权系数由天线的信道信息和通信双方约定使用的扩频序列决定. 由于发射天线的快速切换，发射信号是一种与发射天线信道信息和扩频序列相关的空间扩频信号. 期望接收机可采用与普通扩频信号接收机相同的方法解调接收信号，而窃听接收机由于信道的快速切换无法正常解调接收信号. 仿真结果表明，相比于参考方法发射信号，该文提出的信号不仅具有相同的物理层防窃听能力，而且还具有防侦测和一定的抗干扰能力，是一种更好的基于多天线发射的物理层安全通信信号.

关键词: 切换天线阵, 低截获概率, 安全通信, 物理层安全

Abstract:

Abstract: A signal transmitted from a switched antenna array with low probability of interception is proposed
to ensure information security in the physical layer transmission. The main idea is that the transmitter
estimates channel information from a training sequence transmitted by the mobile terminal and randomly
selects several antennas for fast switching transmission. Weighting coefficients of each antenna are calculated
according to channel information and the spread-spectrum sequence. Therefore, the signal is a space-spreadspectrum
signal associated with the spread-spectrum sequence and the channel information of each antenna.
In this way, the desired receiver with a single antenna can demodulate the received signal as traditional spreadspectrum
signals, while eavesdroppers cannot extract any useful information from the received signal even if
eavesdroppers know the spread-spectrum sequence of the transmit signal because of the fast switching of the
transmit antenna. Simulation results show that the signal has the same ability of anti-eavesdropping, and has
anti-jamming capability with low probability of detection compared to a reference method.

Key words: switched antenna array, low probability of interception, secure communication, physical layer security

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