Decorrelation of broad band signals by toeplitz-block-toeplitz structuring

Indukumar, KC and Reddy, VU (1994) Decorrelation of broad band signals by toeplitz-block-toeplitz structuring. In: IEEE aerospace and electronic systems magazine, 30 (3). pp. 685-697.

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Abstract

We propose F-norm of the cross-correlation part of the array covariance matrix as a measure of correlation between the impinging signals and study the performance of different decorrelation methods in the broadband case using this measure. We first show that dimensionality of the composite signal subspace, defined as the number of significant eigenvectors of the source sample covariance matrix, collapses in the presence of multipath and the spatial smoothing recovers this dimensionality. Using an upper bound on the proposed measure, we then study the decorrelation of the broadband signals with spatial smoothing and the effect of spacing and directions of the sources on the rate of decorrelation with progressive smoothing. Next, we introduce a weighted smoothing method based on Toeplitz-block-Toeplitz (TBT) structuring of the data covariance matrix which decorrelates the signals much faster than the spatial smoothing. Computer simulations are included to demonstrate the performance of the two methods.

Item Type:	Journal Article
Publication:	IEEE aerospace and electronic systems magazine
Publisher:	IEEE
Additional Information:	Copyright 1994 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.
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	02 Jun 2011 08:55
Last Modified:	02 Jun 2011 08:55
URI:	http://eprints.iisc.ac.in/id/eprint/36395

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