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Open Access

Efficient Analysis of Time-Varying Multicomponent Signals with Modified LPTFT

EURASIP Journal on Advances in Signal Processing20052005:784762

https://doi.org/10.1155/ASP.2005.1261

Received: 19 May 2004

Published: 31 May 2005

Abstract

This paper presents efficient algorithms for the analysis of nonstationary multicomponent signals based on modified local polynomial time-frequency transform. The signals to be analyzed are divided into a number of segments and the desired parameters for computing modified the local polynomial time-frequency transform in each segment are estimated from polynomial Fourier transform in the frequency domain. Compared to other reported algorithms, the length of overlap between consecutive segments is reduced to minimize the overall computational complexity. The concept of adaptive window lengths is also employed to achieve a better time-frequency resolution for each component. Numerical simulations with synthesized multicomponent signals show that the proposed ones achieve better performance on instantaneous frequency estimation with greatly reduced computational complexity.

Keywords and phrases

time-frequency analysistime varyingmulticomponentmodified LPTFTimpulse noise

Authors’ Affiliations

(1)
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

Copyright

© Wei and Bi 2005

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