一些不同的数字调制信号有着相同或相近的功率谱密度，但它们的谱相关函数却有明显区别。平稳的噪声和干扰的谱相关为零。利用谱相关函数的这些性质可以识别出噪声中的调制信号。本文提出了一种用于移动通信信号自动调制识别的谱相关算法，该方法可以识别各种主要无线系统和标准所采用的调制类型。 Some different digital modulated signals have the same or similar power spectral density, but their spectral correlation functions are significantly different. The stationary noise and interference spectral correlation is zero. Using these properties of the spectral correlation function, the modulated signal in noise can be identified. This paper presents a spectral correlation algorithm for automatic modulation recognition of mobile communication signals that identifies the types of modulation used by various major wireless systems and standards.