Generalized Broadband Beamforming Using a Modal Subspace Decomposition
Date
2007
Authors
Williams, Michael I Y
Abhayapala, Thushara
Kennedy, Rodney
Journal Title
Journal ISSN
Volume Title
Publisher
SpringerOpen
Abstract
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 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.
Description
Keywords
broadband beamformer design technique, field measurements, modal subspace decomposition (MSD) technique
Citation
Collections
Source
EURASIP Journal on Advances in Signal Processing
Type
Journal article