人工噪声辅助物理层安全通信系统峰均比

针对人工噪声辅助的物理层安全通信系统发射信号高峰均比问题,分析了不同发射天线条件下发射信号峰均比的互补累积分布以及峰均比问题对于期望接收机通信性能的影响。在不影响系统安全性能的前提下,提出了一种基于噪声子空间旋转不变特性的峰均比优化算法,采用差分遗传算法得到了噪声子空间旋转角度的近似最优解。同时，为了降低峰均比算法工程实现的计算复杂度,给出了一种部分旋转角度的次优算法。仿真结果表明，本文提出的峰均比降低算法能有效地降低人工噪声辅助的物理层安全通信信号高峰均比特性,从而保证期望接收机的通信性能。

Research of the peak-to-average power ratio problem for physical-layer security communication system aided by artificial noise

To solve the peak-to-average power ratio (PAPR) problem for the physical layer security communication system aided by artificial noise, the complementary cumulative distribution function (CCDF) of the PAPR problem and the impact of the PAPR problem on the communication performance of the legal user are analyzed. On the premise of keeping the security capacity of this physical layer security communication system, a PAPR reduction algorithm based on the rotation invariant of artificial noise subspace is proposed. The differential genetic algorithm is also employed to obtain the near optimum solution rotation angle of artificial noise subspace. Furthermore, a partial rotation angle sub-optimal algorithm is presented to reduce the computational complexity of the PAPR reduction algorithm. Simulation results show that the proposed algorithm reduces the PAPR performance effectively to guarantee the communication performance of the legal user.