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A Note on Redundancy Averaging

Indukumar, KC and Reddy, VU (1992) A Note on Redundancy Averaging. In: IEEE Transactions on Signal Processing, 40 (2). pp. 466-469.


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It is well known that the performance of direction-of-arrival (DOA) estimation and beamforming algorithms degrades in the presence of correlated signals. Since the techniques like spatial and weighted smoothing, which were developed for decorrelating the signals, suffer from reduced effective aperture, several authors have recently proposed redundancy averaging as an alternative spatial averaging method. In this correspondence, we analyze this method for the asymptotic case and show that the eigenstructure of the resulting matrix, after redundancy averaging, is inconsistent with that of the underlying signal model, thereby leading to biased DOA estimates. Further, perfect decorrelation of the signals is not guaranteed even if the array size is made infinitely large.

Item Type: Journal Article
Publication: IEEE Transactions on Signal Processing
Publisher: IEEE
Additional Information: Copyright 1990 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: 25 Aug 2008
Last Modified: 19 Sep 2010 04:27
URI: http://eprints.iisc.ac.in/id/eprint/6876

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