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针对通信信号调制识别,提出了一种基于信号谱线特征的调制识别方法。该方法采用信号平方谱和四次方谱的强度与位置作为信号的特征参数。信号的这种谱线特征与信号调制样式有着密切的内在联系,较好地反映了信号调制特性。相比其它调制样式识别方法,这种方法计算复杂度低,在非理想环境下对信号特征提取较为容易并且这种特征有较强的鲁棒性。对于调制样式多变的软件无线电和认知无线电有较好的应用效果。仿真表明,在低信噪的情况下,对不同的调制样式识别概率较高。
Aiming at the modulation recognition of communication signals, a modulation identification method based on signal spectral characteristics is proposed. The method uses the intensity and position of the signal square spectrum and the fourth power spectrum as the characteristic parameters of the signal. The signal characteristics of this line with the signal modulation is closely related to the style, a good reflection of the signal modulation characteristics. Comparing with other modulation style recognition methods, this method has low computational complexity, it is easier to extract signal features in non-ideal environment and the robustness of this feature is stronger. For the modulation of the software and radio varied cognitive radio has better application results. Simulation shows that in the case of low signal-to-noise, the recognition probability of different modulation patterns is higher.