XIANG Qiang, QIN Kai-yu. A Time-frequency Analysis Method Based on Linear Canonical Transform and Short-time Fourier Transform[J]. Acta Electronica Sinica, 2011, 39(7): 1508-1513.
XIANG Qiang, QIN Kai-yu. A Time-frequency Analysis Method Based on Linear Canonical Transform and Short-time Fourier Transform[J]. Acta Electronica Sinica, 2011, 39(7): 1508-1513.DOI:
which is a generalization of the Fourier transform and the fractional Fourier transform
has been used in many fields of optics and signal processing.The short-time Fourier transform (STFT) is a kind of linear Time-Frequency Representations (TFRs).Compared with many bilinear TFRs
the STFT does not have the cross-term problem.Because of this advantage
the STFT becomes an important time-frequency analysis tool.Starting with the LCT's definition and its properties
many useful relations between the LCT and the STFT have been derived.Based on these relations
we present a new time-frequency signal analysis method
which has no cross-terms problem.It can be used to realize interference suppression of chirp signals and separate components from a time-frequency signal.Finally the simulation results illustrate the validity of the proposed method.