Flexibeam: Analytic Spatial Filtering By Beamforming

We propose a new, general, method for spatial filtering by beam-forming. The desired filter, specified analytically on an n-dimensional sphere, is extended to n+1-dimensional Euclidean space. A continuous beamforming function is then obtained by the n+1-dimensional Fourier transform of the extended filter. The beamforming weight at a given array element corresponds then to a sample of the function at the array element location., The scheme is a generalisation of focused beamforming on a single point by phase difference alignment. The analytic framework allows tractable, stable determination of beamforming weights, and for clear filter specification. By avoiding approximating a Dirac, desired areas can be covered with reduced side lobes. Multiple areas may be targeted simultaneously. In communications applications, channel information updates can be reduced, and movement accounted for. A WiFi demonstration shows that more flexible beam-shapes can be beneficial for real-life examples, factoring in attenuation.

Published in:
2016 Ieee International Conference On Acoustics, Speech And Signal Processing Proceedings, 2877-2880
Presented at:
IEEE 2016 International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2016), Shanghai, China, March 15-20, 2016
New York, Ieee
Copyright 2016 IEEE. Published in the IEEE 2016 International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2016), scheduled for 20-15 March 2016 in Shanghai, China. 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. Contact: Manager, Copyrights and Permissions / IEEE Service Center / 445 Hoes Lane / P.O. Box 1331 / Piscataway, NJ 08855-1331, USA. Telephone: + Intl. 908-562-3966. DOI: 10.1109/ICASSP.2016.7472203

 Record created 2016-12-20, last modified 2018-01-28

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