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Estimation for Instantaneous Frequency Using a Combined Fractional TimeFrequency Representation
Jiaqiang LI Ronghong JIN JunPing GENG
Publication
IEICE TRANSACTIONS on Communications
Vol.E90B
No.1
pp.189191 Publication Date: 2007/01/01 Online ISSN: 17451345
DOI: 10.1093/ietcom/e90b.1.189 Print ISSN: 09168516 Type of Manuscript: LETTER Category: Sensing Keyword: timefrequency representations, shorttime Fourier transform, Wigner distribution, instantaneous frequency,
Full Text: PDF(182.5KB)>>
Summary:
In this letter, a combined method based on the fractional linear and the fractional bilinear timefrequency representations (TFRs) is proposed. The method combines the windowed fractional shorttime Fourier transform with the fractional Wigner distribution (WD) to estimate the instantaneous frequency (IF) of signals in the appropriate fractional timefrequency domain. For a multicomponent signal, the method can significantly eliminate the cross terms and improve the timefrequency resolution of the autoterms. It is applied to the detection and parameter estimation of linear frequency modulated (LFM) signals. The computer simulations clearly demonstrate that the method is effective.

