Abstract:

Wavelet transformation has the characteristic of local microscope,so it is able to capture the instantaneous character of signals.This paper introduces the basic principle of Haar wavelet,and makes an analysis of the wavelet domain character of PSK signals starting with the definition of continuous wavelet transformation.Simulation of the wavelet transformation of QPSK signals in the background of white gauss noise is performed,whose result indicates that wavelet transformation can effectively obtain and extract the information of signals.

Key words: wavelet transformation;QPSK;symbol rate estimation;differential coefficient;plastic