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Title:
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Nonlinear Wigner-Ville Spectrum Estimation using Wavelet Soft Thresholding |
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Author:
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Baraniuk, Richard G.
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Type:
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Conference Paper |
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Keywords:
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Wigner-Ville distribution; wavelet transform; wavelet soft-thresholding |
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Citation:
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R. G. Baraniuk,"Nonlinear Wigner-Ville Spectrum Estimation using Wavelet Soft Thresholding," in SPIE Technical Conference on Wavelet Applications for Dual-Use, |
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Abstract:
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The large variance of the Wigner-Ville distribution makes smoothing essential for producing readable estimates of the time-varying power spectrum of noise corrupted signals. Since linear smoothing trades reduced variance for increased bias of the signal components, we explore two nonlinear estimation techniques based on soft-thresholding in an orthonormal basis representation. Soft-thresholding provides considerable variance reduction without greatly impairing the time-frequency resolution of the estimated spectrum. |
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Date Published:
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1995-04-01 |
