A Survey of Automatic Modulation Classification Techniques: Classical Approaches and New Trends.This is also a very good papaer like that of azzouz and nandi

Implementation on "Automatic modulation classification using zero crossing"

利用FFT求一个信号的谱相关函数，在论文Automatic Modulation Classification for Cognitive Radios Using Cyclic中有提到-Seeking a signal using FFT spectral correlation function, the paper Automatic Modulation Classification for Cognitive Radios Using Cyclic mentioned in