Open Access

Techniques to Obtain Good Resolution and Concentrated Time-Frequency Distributions: A Review

EURASIP Journal on Advances in Signal Processing20092009:673539

Received: 12 July 2008

Accepted: 23 April 2009

Published: 9 June 2009


We present a review of the diversity of concepts and motivations for improving the concentration and resolution of timefrequencydistributions (TFDs) along the individual components of the multi-component signals. The central idea has been to obtain a distribution that represents the signal’s energy concentration simultaneously in time and frequency without blur andcrosscomponents so that closely spaced components can be easily distinguished. The objective is the precise description of spectralcontent of a signal with respect to time, so that first, necessary mathematical and physical principles may be developed, andsecond, accurate understanding of a time-varying spectrum may become possible. The fundamentals in this area of research havebeen found developing steadily, with significant advances in the recent past.

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Authors’ Affiliations

Centre for Advanced Studies in Engineering (CASE)
Iqra University
Laboratory for Electromagnetic and Electronic Systems (LEES), MIT


© Imran Shafi et al. 2009

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.