一种基于零陷导向随机跳空的物理层安全方法

使用跳空可以解决基于人工噪声的物理层安全方法信号空间分布恒定、易被窃听的问题,但是跳空图案泄露会导致系统安全性能失效。针对这一问题,提出一种基于零陷导向随机跳空的物理层安全方法。合法用户通过随机切换接收天线实现跳空,同时发送方通过波束成形对下一周期激活天线形成零陷,从而与合法用户实时约定跳空图案。由于主信道和窃听信道的差异性,窃听用户无法获取跳空图案。仿真结果表明,由于未知天线跳变规律,窃听者即使采用MUSIC-like方法进行窃听,仍无法实现干扰抑制,在BPSK调制方式下,其误码率接近0.5。

Null-Steering Guided Random Space Hopping for Physical Layer Secure Transmission

Random space hopping can solve the problem that physical layer security methods based on artificial noise may be easily eavesdropped because of constant signal spatial distribution,but leakage of space hopping pattern may make the system insecure. To solve this problem,a physical layer security method based on null-steering guided random space hopping is presented. The method switches spatial equivalent channels by randomly selecting the receiving antenna of the legitimate user,simultaneously the transmitter nulls the selected antenna of the next period through beam-forming,thus the spatial hopping pattern is constructed. Because of the difference between the main channel and the wiretap channel,the eavesdropper cannot obtain the spatial hopping pattern. Simulation results show that the eavesdropper cannot suppress interference even if it uses the MUSIC-like method; the bit error rate is about 0. 5 when using BPSK.