Modulation identification of digital signals by the wavelet transform
Modulation identification of digital signals by the wavelet transform
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DOI：
10.1049/ip-rsn:20000492
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发表时间：
2000-08-01
期刊：
影响因子：
--
通讯作者：
Chan, YT
中科院分区：
文献类型：
--
作者：
Ho, KC;Prokopiw, W;Chan, YT
例如在电子监视中，需要确定输入信号的调制类型。介绍了小波变换在数字信号调制识别中的应用。小波变换可以有效地提取数字通信信号中的瞬态特征，产生清晰的模式，便于简单识别。三个标识符分类PSK和FSK，M进制PSK和M进制FSK。统计假设检验的推导。当载噪比较低时，需要符号周期和同步时间来提高识别精度。一种方法，估计他们从小波变换系数。通过仿真研究了该识别器的性能。
There is a need, for example in electronic surveillance, to determine the modulation type of an incoming signal. The use of the wavelet transform for modulation identification of digital signals is described. The wavelet transform can effectively extract the transient characteristics in a digital communication signal, yielding distinct patterns for simple identification. Three identifiers for classifying PSK and FSK, M-ary PSK and M-ary FSK are considered. Statistics for hypothesis testing are derived. When the carrier-to-noise ratio is low, the symbol period and synchronisation time are needed to improve identification accuracy. A method for estimating them from the wavelet transform coefficients is included. The performance of the identifier is investigated through simulations.