Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Broadband Beamspace DOA Estimation: Frequency-Domain and Time-Domain Processing | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 16907 10 pages doi 2007 16907 Research Article Broadband Beamspace DOA Estimation Frequency-Domain and Time-Domain Processing Approaches Shefeng Yan Institute of Acoustics Chinese Academy of Sciences 100080 Beijing China Received 1 November 2005 Revised 11 April 2006 Accepted 12 May 2006 Recommended by Peter Handel Frequency-domain and time-domain processing approaches to direction-of-arrival DOA estimation for multiple broadband far field signals using beamspace preprocessing structures are proposed. The technique is based on constant mainlobe response beamforming. A set of frequency-domain and time-domain beamformers with constant frequency independent mainlobe response and controlled sidelobes is designed to cover the spatial sector of interest using optimal array pattern synthesis technique and optimal FIR filters design technique. These techniques lead the resulting beampatterns higher mainlobe approximation accuracy and yet lower sidelobes. For the scenario of strong out-of-sector interfering sources our approaches can form nulls or notches in the direction of them and yet guarantee that the mainlobe response of the beamformers is constant over the design band. Numerical results show that the proposed time-domain processing DOA estimator has comparable performance with the proposed frequency-domain processing method and that both of them are able to resolve correlated source signals and provide better resolution at lower signal-to-noise ratio SNR and lower root-mean-square error RMSE of the DOA estimate compared with the existing method. Our beamspace DOA estimators maintain good DOA estimation and spatial resolution capability in the scenario of strong out-of-sector interfering sources. Copyright 2007 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION Broadband direction-of-arrival DOA estimation has found numerous applications to
