Spectral estimation based on subband decomposition by harmonic wavelet transform and modified group delay13;

Narasimhan, SV and Harish, M (2004) Spectral estimation based on subband decomposition by harmonic wavelet transform and modified group delay13;. In: 2004 International Conference on Signal Processing and Communications, 11-14 Dec 2004.

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Abstract

A new spectral estimator that exploits the simplicity and computational efficiency of the Harmonic Wavelet Transform (HWT) for signal decomposition and the variance reduction property of the Modified Group Delay (MGD), without any loss in frequency resolution, has been proposed. As the HWT directly provides the decimated subband components in the frequency domain, it enables direct application of the MGD to subband signals. In the HWT, the decomposition separates different parts of the spectrum into subbands and the decimation stretches each subband spectrum, hence the frequency resolution improves. Further as this also separates a low level spectral peak from a strong neighboring one, the signal detectability also improves. The MGD improves noise immunity as it not only removes the spectral ripples due to leakage effect but also due to the associated noise. In view of these, the new estimator facilitates a significant improvement in: the reduction of variance, frequency resolution and signal detectability; compared with those of the MGD processing of fullband signals.

Item Type: Conference or Workshop Item (Paper)
Additional Information: xA9;2004 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Uncontrolled Keywords: Harmonic wavelet transform;Fullband signals
Subjects: AERONAUTICS > Aerodynamics
Division/Department: Aerospace Electronics and Controls Division, Aerospace Electronics and Controls Division
Depositing User: M/S ICAST NAL
Date Deposited: 13 Mar 2007
Last Modified: 24 May 2010 09:54
URI: http://nal-ir.nal.res.in/id/eprint/4048

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