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Journal of Applied Sciences ›› 2011, Vol. 29 ›› Issue (4): 368-373.doi: 10.3969/j.issn.0255-8297.2011.04.006

• Communication Engineering • Previous Articles     Next Articles

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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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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