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      • Department of Electrical and Electronics Engineering
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      High resolution time-frequency analysis by fractional domain warping

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      Author
      Özdemir, Ahmet Kemal
      Durak, Lütfiye
      Arıkan, Orhan
      Date
      2001-05
      Source Title
      ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
      Publisher
      IEEE
      Pages
      3553 - 3556
      Language
      English
      Type
      Conference Paper
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      Abstract
      A new algorithm is proposed to obtain very high resolution time-frequency analysis of signal components with curved time-frequency supports. The proposed algorithm is based on fractional Fourier domain warping concept introduced in this work. By integrating this warping concept to the recently developed directionally smoothed Wigner distribution algorithm [1], the high performance of that algorithm on linear, chirp-like components is extended to signal components with curved time-frequency supports. The main advantage of the algorithm is its ability to suppress not only the cross-cross terms, but also the auto-cross terms in the Wigner distribution. For a signal with N samples duration, the computational complexity of the algorithm is O(N log N) flops for each computed slice of the new time-frequency distribution.
      Keywords
      Fractional Fourier transform domain
      Time frequency analysis
      Wigner distribution
      Algorithms
      Computational complexity
      Fourier transforms
      Frequency domain analysis
      Time domain analysis
      Signal processing
      Permalink
      http://hdl.handle.net/11693/27609
      Published Version (Please cite this version)
      https://doi.org/10.1109/ICASSP.2001.940609
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      • Department of Electrical and Electronics Engineering 3524
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