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多进制数字相位调制信号(MPSK)是一类载波受抑制的相位调制信号,它们具有相位连续,幅度恒定以及抗干扰性强的特性,在军用和民用通信的很多领域都有广泛的应用,研究分类该类信号具有重要的实际价值。在研究分析MPSK信号谱相关特性的基础上提出一种MPSK信号的子类识别算法,利用MPSK(M≥4)平方降阶的性质,提取出MPSK信号的循环谱在循环频率f=0截面的特征,并根据该特征分类完成调制识别。计算机仿真实验证明了该算法在信噪比高于5dB时调制识别率高于95%。
Multi-band digital phase modulation (MPSK) is a type of carrier-suppressed phase-modulated signal that has characteristics of continuous phase, constant amplitude and strong anti-interference. It is widely used in many fields of military and civilian communications, Research and classification of such signals have important practical value. Based on the analysis of the correlation characteristics of MPSK signal spectrum, a subclass recognition algorithm of MPSK signal is proposed. By using the property of MPSK (M≥4) square reduction, the cyclic spectrum of MPSK signal is extracted at a frequency of f = 0 Features, and based on the characteristics of classification to complete the modulation recognition. Computer simulation results show that the modulation recognition rate of this algorithm is higher than 95% when SNR is above 5dB.