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Summary: Noname manuscript No.
(will be inserted by the editor)
Wideband Beamspace Processing Using Orthogonal Modal
Beamformers
Thushara D. Abhayapala · Darren B. Ward
Received: 15 April 2009 / Revised: 08 August 2009/ Accepted: date
Abstract We introduce a novel beamspace processing structure that can be used
for narrowband or wideband sources located either in nearfield or farfield of a sensor
array. Main features of the new structure are: (i) a single parameter is used to steer
the processor to any desired radial distance; (ii) a set of fixed frequency invariant
orthogonal beamformers are used to transform array data into beamspace; and (iii)
consequently, only a single set of beamspace weights are needed to process wideband
beamspace data. The utility of the novel structure is illustrated by applications in
interference cancellation and direction/range estimation.
Keywords broadband beamforming, array processing, adaptive arrays, direction
estimation, interference cancellation, nearfield, sensor arrays
1 Introduction
Wideband beamspace processing is used in applications of adaptive interference can-
cellation and direction of arrival (DOA) estimation in the fields of speech acquisition,
radar, sonar and radio communications. While there has been a plethora of beamspace
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