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通信信号调制方式包括模拟与数字两大类。根据模拟、数字调制信号有无符号率的特点,提出了采用非线性变换与小波变换相结合的方法,获得信号的包络与瞬变信息,然后再提取变换后的频域特征,无需设置判决门限便可直接实现这两种调制方式的分类。通过理论分析和实验仿真验证了该算法的有效性,并对LSB、USB、AM、FM、ASK、FSK、PSK、QAM这几种信号的仿真结果进行了分析。
Communication signal modulation methods include analog and digital two categories. According to the characteristics of analog and digital modulation signal with no symbol rate, a method of combining nonlinear transform with wavelet transform is proposed to obtain envelope and transient information of signals, and then extract the transformed frequency domain features without setting the decision Threshold can directly achieve the classification of these two modulation methods. The effectiveness of this algorithm is verified by theoretical analysis and experimental simulation. The simulation results of LSB, USB, AM, FM, ASK, FSK, PSK and QAM signals are also analyzed.