Alpha稳定分布噪声下通信信号的载波频率估计

Aiming at the problem of the failure of cyclic spectrum estimation of communication signal carrier frequency in the Alpha-stable distribution noise environment, a carrier frequency estimation method based on the generalized cyclic spectrum is proposed. Firstly, the generalized cyclic spectrum is defined by a nonlinear transformation, and the signal amplitude is transformed; then the non-Gaussian impulsive noise mixed in the communication signal is suppressed by the nonlinear transformation. The carrier frequency estimation is achieved by detecting the relationship between the spectral line position of the generalized cyclic spectrum and the carrier frequency of the digital modulation signal. Through Matlab simulation experiments and performance analysis and comparison, it is proved that this method can better estimate the carrier frequency of the communication signal in the Alpha-stable distribution noise environment.

针对在Alpha 稳定分布噪声环境下循环谱估计通信信号载波频率失效问题，提出了基于广义循环谱的载波频率估计方法．首先用非线性变换定义广义循环谱，并对信号幅度进行变换；然后利用非线性变换抑制夹杂在通信信号中的非高斯脉冲噪声．通过检测广义循环谱的谱线位置与数字调制信号载波频率的关系实现载波频率估计．通过Matlab 仿真实验和性能分析对比，证明该方法可较好地在Alpha 稳定分布噪声环境下估计通信信号的载波频率．