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Generalized Broadband Beamforming Using a Modal Subspace Decomposition

Williams, Michael I Y; Abhayapala, Thushara; Kennedy, Rodney

Description

We propose a new broadband beamformer design technique which produces an optimal receiver beam pattern for any set of field measurements in space and time. The modal subspace decomposition (MSD) technique is based on projecting a desired pattern into the subspace of patterns achievable by a particular set of space-time sampling positions. This projection is the optimal achievable pattern in the sense that it minimizes the mean-squared error (MSE) between the desired and actual patterns. The...[Show more]

dc.contributor.authorWilliams, Michael I Y
dc.contributor.authorAbhayapala, Thushara
dc.contributor.authorKennedy, Rodney
dc.date.accessioned2015-09-03T06:29:39Z
dc.date.available2015-09-03T06:29:39Z
dc.identifier.issn1687-6180
dc.identifier.urihttp://hdl.handle.net/1885/15165
dc.description.abstractWe propose a new broadband beamformer design technique which produces an optimal receiver beam pattern for any set of field measurements in space and time. The modal subspace decomposition (MSD) technique is based on projecting a desired pattern into the subspace of patterns achievable by a particular set of space-time sampling positions. This projection is the optimal achievable pattern in the sense that it minimizes the mean-squared error (MSE) between the desired and actual patterns. The main advantage of the technique is versatility as it can be applied to both sparse and dense arrays, nonuniform and asynchronous time sampling, and dynamic arrays where sensors can move throughout space. It can also be applied to any beam pattern type, including frequency-invariant and spot pattern designs. A simple extension to the technique is presented for oversampled arrays, which allows high-resolution beamforming whilst carefully controlling input energy and error sensitivity.
dc.publisherSpringerOpen
dc.rightsCopyright © 2007 Michael I. Y. Williams et al. 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.
dc.sourceEURASIP Journal on Advances in Signal Processing
dc.subjectbroadband beamformer design technique
dc.subjectfield measurements
dc.subjectmodal subspace decomposition (MSD) technique
dc.titleGeneralized Broadband Beamforming Using a Modal Subspace Decomposition
dc.typeJournal article
local.identifier.citationvolume2007
dc.date.issued2007
local.type.statusPublished Version
local.contributor.affiliationWilliams, Michael I Y, Department of Information Engineering, Research School of Information Sciences and Engineering, The Australian National Universit
local.contributor.affiliationAbhayapala, Thushara D, Department of Information Engineering, Research School of Information Sciences and Engineering, The Australian National Universit
local.contributor.affiliationKennedy, Rodney A, Department of Information Engineering, Research School of Information Sciences and Engineering, The Australian National Universit
local.bibliographicCitation.issue1
local.bibliographicCitation.startpage068291
local.identifier.doi10.1155/2007/68291
CollectionsANU Research Publications

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