一种改进型的多天线加权跳空保密通信技术

摘要

The physical layer security of multi⁃antenna communication system has become an important research content of com⁃munication security in recent years.The artificial noise method and antenna array random weighting method of multi⁃antenna secure com⁃munications can realize secure information in a wireless communication system,which guarantees the security at the physical layer of wireless communications.But when the number of eavesdropper antennas are more than or equal to those of the senders,the eavesdropper can intercept signals through Music⁃like.To address this issue,an improved multi⁃antenna array weighting method is proposed.The meth⁃od combines the array weighting method and the space⁃hopping technique, in which the receiver selects the appropriate channel to receive and demodulate according to the generated pattern,but the eavesdropper cannot demodulate the signal since he doesn’ t have the pattern.Even if the eavesdropper knows the space⁃hopping pattern,he cannot obtain the correct message since the artificial noise in zero space cannot be eliminated.%多天线阵列随机加权方法和人工噪声方法可以在物理层保障无线通信的安全。但是，当窃听者天线数大于等于发送者时，窃听者就有可能通过Music⁃like窃取信号。针对此问题，提出了一种改进的多天线阵列加权方法。该方法是通过阵列加权方法和跳空技术相结合，接收者根据生成的跳空图案选择相应信道接收解调，而窃听者没有跳空图案所以不能解调出信号，即使窃听者知道跳空图案，但他不能消除零空间内的人工噪声，窃听者仍然没有办法得到正确的发送信息。仿真结果显示，该方法是一种有效的物理层保密通信方法。