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通信技术的数字化已经是现代通信发展的趋势。为识别出通信信号中的数字信号的调制方式,分析了解析信号以及归一化处理后的数字信号经过小波变换后的特点,提出直接提取信号小波变换后的频域特征的算法。该算法无需设置判决门限,可以更简单、直接地实现数字信号与其它信号的类间区分以及数字信号之间的区分。通过仿真表明,该方法可有效区分PSK、FSK、QAM与AM、FM、SSB、CW、噪声。
The digitization of communication technology is the trend of modern communication. In order to identify the modulation method of the digital signal in the communication signal, the analysis of the analyzed signal and the normalized digital signal after the wavelet transform characteristics are proposed, and the algorithm of extracting the frequency domain feature of the signal wavelet transform directly is proposed. The algorithm does not need to set the decision threshold, which can realize the distinction between digital signals and other signals and the distinction between digital signals more easily and directly. The simulation shows that this method can effectively distinguish PSK, FSK, QAM and AM, FM, SSB, CW and noise.