IF Estimation for Multicomponent Signals

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IF Estimation for Multicomponent Signals

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Title: IF Estimation for Multicomponent Signals
Author: Hussain, Z.M.; Boashash, B
Abstract: Concurrent IF estimation of the separate components of a multicomponent FM signal using TFD peaks location requires conditions on the selection of a suitable quadratic TFD. Required properties are: (1) high time-frequency resolution while suppressing cross-terms efficiently, (2) the TFD to enable direct amplitude estima- tion for the individual components, (3) the variance of the IF estimate using the TFD should be a continuously decreasing function of the lag window length while the bias is continuously increasing. Quadratic time-frequency distributions that satisfy these conditions were presented and discussed. A constant-window tracking algorithm may not give a robust IF estimate if the IF changes rapidly with time due to the effect of the higher-order derivatives of the IF law. Hence an adaptive algorithm is used for robust multicomponent IF estimation.
Description: This Article presents the approach to IF estimation of the separate components of a multicomponent FM signal using TFD peaks location, and the required conditions on the selection of a suitable quadratic TFD. (Additional details can be found in the comprehensive book on Time-Frequency Signal Analysis and Processing (see http://www.elsevier.com/locate/isbn/0080443354). In addition, the most recent upgrade of the original software package that calculates Time-Frequency Distributions and Instantaneous Frequency estimators can be downloaded from the web site: www.time-frequency.net. This was the first software developed in the field, and it was first released publicly in 1987 at the 1st ISSPA conference held in Brisbane, Australia, and then continuously updated).
URI: http://hdl.handle.net/10576/10795
Date: 2003

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