A Robust Broad-Band Beamformer with Spatial and Frequency Derivative Constraints

Yi CHU  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.2   pp.567-577
Publication Date: 2009/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.567
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
broad-band beamformer,  derivative constraints,  angular beamwidth,  wavelets,  

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In this paper, we propose a set of constraints for adaptive broad-band beamforming in the presence of angular errors. We first present spatial and frequency derivative constraints (SFDC) for the design of the quiescent beamformer response. With the wavelet-based blocking matrices, the proposed generalized sidelobe canceller (GSC) preserves the desired signal, and it is less sensitive to the broad-band noise. To make this beamformer more robust to the directional mismatch, we add a pseudo-interference algorithm in the weight adaptive process. Analysis and simulation results demonstrate that the angular beamwidth is insensitive to the input signal-to-noise ratio (SNR).