After a bandpass filter, QDPSK signal's symbol can be divided into steady section and transition section, so the demodulation and synchronization for the signal can be realized with DFT.
The multiresolution empirical mode decomposition method of signal can be interpreted as spatial filtering based on the signal's extremum characteristic scale.
信号的多分辨经验模分解方法可以解释为以信号极值特征尺度为度量的时空滤波过程。
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The mathematical morphology operator is based on the signal shape which clarifies the signal's peaks and valleys.