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一种基于多波束与人工噪声的物理层安全通信方法
赵伟,宋茂忠
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(南京航空航天大学电子信息工程学院，南京 210016)

摘要:

为了提高无线传输过程中通信信息被窃听的难度，提出了一种采用多波束发射人工噪声干扰来实现物理层安全传输的方法。发送端同时发送通信信息和两组人工噪声，通过天线加权系数调整使通信信息的方向图主瓣对准期望方位，而人工噪声的方向图在期望方位形成零陷。仿真结果表明，该方法可实现在空间某一期望方位的可靠通信，而偏离该方位的接收机误码性能迅速下降，在方向图旁瓣范围内根本无法解调出有用信息。

关键词: 安全通信物理层多波束人工噪声

DOI：

基金项目:

A Secure Method of Physical Layer Transmission Based on Multi beam and Artificial Noise

ZHAO Wei,SONG Mao-zhong

(College of Electronic and Information Engineering, Nanjing University of Aeron autics and Astronautics, Nanjing 210016, China)

Abstract:

A secure method based on multibeam and artificial noise is proposed t o guarantee the information uneavesdropped during the physical layer transmitt i ng. Transmitter sends the signal bearing information and two artificial noise si gnals simultaneously. Each signal is multiplied by a group of weighting coeffici ents, which is generated through adapative beamforming technique, to enable that the main lobe of antenna pattern of the signal bearing information directs expe cted position while the antenna patterns of artificial noises form nulls at the same position. Simulation results show that the desired receiver can demodulate the information effectively while the performance deteriorates obviously when th e azimuth deviates off the desired receiver.

Key words: secure communication physical layer multi beam artificial noise