模拟数字通信信号调制识别研究

Method of analog and digital communication signal modulation and identification

在符号变化的时刻,数字调制信号存在幅度、频率等变化的奇异点,而模拟调制信号却不然。利用2次小波变换检测奇异点的有无,提出了1种逼近相消算法来区分数字调制方式和模拟调制方式。通过对通信系统中常用的PSK、FSK、QAM、ASK、FM、AM信号调制方式的仿真,验证了此识别算法的有效性。

While the symbol changing, there are singularities with varying amplitude or frequency in digital modulation. We take advantage of wavelet transform twice to detect whether the singularities exist, and then put forward the approximation cancellation algorithm to distinguish digital modulation type and analog modulation type. The validity of the identification algorithm is verified through simulations of modulation types of PSK, FSK, QAM, ASK, FM, AM which are usually used in system .