一种调制符号相位随机扰动的物理层安全方法

从信号调制的角度提出了一种调制符号相位随机扰动的物理层安全方法.该方法通过合法信道增益与随机扰动幅度的乘积,控制对调制符号的相位扰动范围,使得合法接收者在相位扰动下仍具有稳定的抗噪声性能,而窃听者由于窃听信道状态信息不同于合法信道,相位扰动更加剧烈,解调错误概率高于合法接收者.仿真结果表明：当窃听者未知合法信道状态信息时,文章方法相比直接传输的方法,安全间隙缩小了30.5dB;当窃听者能够获得合法信道相位信息时,文章方法仍能形成对窃听者接收性能的恶化,安全间隙缩小了11dB.

Physical Layer Security Method Based on Random Phase Perturbation

A new method of guaranteeing physical layer security by randomly perturbing the phase of modulated symbols is introduced in this paper. The study defines the range of the perturbation sym- bol phase by the product of the gain of legitimate channels and the amplitude of the random perturba- tion. In that way, the legitimate receiver ensures a stable anti-noise performance, while the bit error rate of the eavesdropper rises rapidly because of the different channel state information （CSI）. The simulation results show that the security gap of this method is reduced by 30.5dB and lldB com- pared with the direct transfer under the condition that the eavesdropper does not know the CSI of the legitimate channel and could get the phase information of the legitimate channel respectively.