Abstract:

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.