Narasimhan, SV and Haripriya, AR and Kumar, BKS (2008) Improved wigner-ville distribution performance based on DCT/DFT harmonic wavelet transform and modified magnitude group delay. Signal Processing, 88 (1). pp. 1-27.
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Abstract
A new Wigner-Ville Distribution (WVD) estimation is proposed. This improved13; and efficient WVD is based on Signal Decomposition (SD) by DCT or DFT Harmonic13; Wavelet Transform (DCTHWT or DFTHWT) and the Modified Magnitude Group13; Delay (MMGD). The MMGD processing can be either in fullband or subband. The SD13; by DCTHWT provides better quality low leakage decimated subband components.13; The concatenation of WVDs of the subbands results in an overall WVD, significantly13; free from crossterms and Gibbs ripple. As no smoothing window is used for the13; instantaneous autocorrelation, MMGD removes or reduces the Gibbs ripple preserving13; the frequency resolution achieved by the DCT/DFT HWT. The SD by DCTHWT13; compared to that of DFTHWT, has improved frequency resolution and detectability.13; These are due to the symmetrical data extension and the consequential low leakage13; (bias and variance). As the zeros due to the associated white noise are removed by the13; MMGD effectively in subband domain than in fullband, the proposed WVD based on13; subband has a better noise immunity. Compared to fullband WVD, the subband WVD13; is computationally efficient and achieves a significantly better: frequency resolution,13; detectability of low-level signal in the presence of high level one and variance. The SD13; based methods, however cannot bring out the frequency transition path from band to13; band clearly, as there will be gap in the contour plot at the transition. For the proposed13; methods, the Heart rate variability (HRV) real data is also considered as an example.
| Item Type: | Article |
|---|---|
| Additional Information: | Copyright for this article belongs to Elsevier B.V |
| Uncontrolled Keywords: | Wigner-Ville distribution;DFT harmonic wavelet transform;DCT harmonic wavelet transform;Signal decomposition;Modified magnitude group delay function;Fullband and subband processing;Heart rate variability (HRV) data |
| Subjects: | AERONAUTICS > Aeronautics (General) |
| Depositing User: | Ms. Alphones Mary |
| Date Deposited: | 30 Apr 2008 |
| Last Modified: | 17 Aug 2015 06:23 |
| URI: | http://nal-ir.nal.res.in/id/eprint/4707 |
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