NDLI: Optimum beamformers for uniform circular arrays in a correlated signal environment

Content Provider	IEEE Xplore Digital Library
Author	Lau, B.K. Leung, Y.H.
Copyright Year	2000
Description	Author affiliation: Australian Telecommun. Res. Inst., Curtin Univ. of Technol., Bentley, WA, Australia (Lau, B.K.)
Abstract	By virtue of their geometry, uniform circular arrays (UCAs) are ideally suited to provide 360 degrees of coverage in the azimuthal plane. However, in a correlated signal environment, the well-known technique of spatial smoothing to mitigate the signal cancellation effect as seen in an optimum beamformer will not work since this technique is applicable only to uniform linear arrays. We show how the transformation of Davies (1965) can be adopted to design optimum beamformers for UCAs in a correlated signal environment. We also introduce derivative constraints to improve the robustness of the optimum beamformers to mismatches between the beamformers' look direction and the actual direction-of-arrival of the desired signal. The effectiveness of our design method is illustrated by a numerical example.
Starting Page	3093
Ending Page	3096
File Size	350396
Page Count	4
File Format	PDF
ISBN	0780362934
ISSN	15206149
DOI	10.1109/ICASSP.2000.861191
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-06-05
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sensor arrays Geometry Smoothing methods Signal design Australia Robustness Vectors Decorrelation Covariance matrix Ambient intelligence
Content Type	Text
Resource Type	Article

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