一种基于天线阵列冗余的跳空物理层安全方法

当窃听者天线数不少于发送者时,基于信道零空间人工噪声的物理层安全方法将失效。针对这一问题,提出了一种基于天线阵列冗余的跳空物理层安全方法。该方法将人工噪声和跳空相结合,每次发射信号时发送者通过跳空图样快速切换信道,同时在相应信道的零空间内加人工噪声,接收者根据跳空图样选择相应信道接收解调,而窃听者接收信号与人工噪声叠加在一起无法解调。仿真结果表明,当接收端使用不少于两根天线接收时,采用文章方法可使窃听者的误比特率接近0.5,而合法接收者不受影响。

Method of Space Hopping Physical Layer Security Based on Antenna Array Redundancy

When eavesdropper has more antennas than transmitters, the physical layer security method based on artificial noise of channel null space cannot work. To solve the problem, a space- hopping physical layer security method based on array redundancy is proposed. The method com- bines artificial noise with space-hopping. First, the transmitter fast switches channel by space- hopping pattern when sending signal, simultaneously, adds artificial noise in the null space of the corresponding channel. Then, the receiver chooses the corresponding channel to decode messages. The eavesdropper＇ s received signal is mixed with artificial noise, so the eavesdropper cannot decode message. Simulations show that, if receiver has multi-antennas, the BER of the eavesdropper ap- proaches to 0.5, while the performance of the legitimated receiver is not degraded.