Alpha稳定分布噪声下MPSK信号调制识别算法研究

针对Alpha稳定分布噪声中信号四次方谱失效的问题,提出了广义四次方谱的概念,在此基础上研究了基于广义四次方谱的多进制相移键控(M-ary Phase Shift Keying,MPSK)信号调制识别算法.首先分析了待识别信号的广义四次方谱,然后提取广义四次方谱中二倍载频和四倍载频处的谱线作为特征参数,最后通过判断谱线是否被冲击来实现信号的分类.仿真结果表明,这种算法在Alpha稳定分布噪声下的性能优于基于四次方谱的算法,且该算法在高斯噪声下也具有良好的性能.

Modulation Recognition Algorithm of MPSK Signals in Alpha Stable Distribution Noise

To solve the problem that quartic spectrum lose the efficacy in the Alpha stable distribution noise, the concept of generalized quartic spectrum is proposed, and the modulation recognition algorithm of MPSK based on generalized quartie spectrum is studied. Firstly, eneralized quartic spectrums of signals is analyzed, and then the algorithm extracts spectrum lines of two times carrier frequency and four times carrier frequency in generalized quartic spectrum as the characteristic parameters, finally the algorithm realize the recognition of signals through judging whether spectrum lines are impact lines or not. Simulation results show that the proposed algorithm is superior to the algorithm based on quartic spectrum in the Alpha stable distribution noise. Moreover, imulation results also show that the proposed algorithm has good performance in the Gaussian noise.