Chen, Chun-Yang and Vaidyanathan, P. P. (2006) A Novel Beamformer Robust to Steering Vector Mismatch. In: 2006 40th Asilomar Conference on Signals, Systems and Computers. Conference Record of the Asilomar Conference on Signals, Systems and Computers . IEEE , New York, pp. 2227-2231. ISBN 978-1-4244-0784-2 http://resolver.caltech.edu/CaltechAUTHORS:20110307-084917820
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It is well know that the performance of the minimum variance distortionless response (MVDR) beamformer is very sensitive to steering vector mismatch because of the signal cancellation. Such mismatches can occur as a result of direction-of arrival (DOA) errors, local scattering, near-far spatial signature mismatch, waveform distortion, source spreading, imperfectly calibrated arrays and distorted antenna shape. In this paper, an adaptive beamformer which is robust against the DOA mismatch is proposed. This method imposes two quadratic constraints such that the magnitude responses of two steering vectors exceed unity. Then a diagonal loading method is used to force the magnitude responses within a range of the arrival angles to exceed unity. The diagonal loading factor can be computed systematically by a proposed algorithm. Numerical examples show that this method has a significantly better SINR performance compared to previously published methods (including the MVDR), and a complexity comparable to the standard MVDR beamformer.
|Item Type:||Book Section|
|Additional Information:||© 2006 IEEE. Issue Date: Oct. 29 2006-Nov. 1 2006. Date of Current Version: 07 May 2007. Work supported in parts by the ONR grant N00014-06-1-0011, and the California Institute of Technology.|
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|Official Citation:||Chun-Yang Chen; Vaidyanathan, P.P.; , "A Novel Beamformer Robust to Steering Vector Mismatch," Signals, Systems and Computers, 2006. ACSSC '06. Fortieth Asilomar Conference on , vol., no., pp.2227-2231, Oct. 29 2006-Nov. 1 2006 doi: 10.1109/ACSSC.2006.355165 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4176975&isnumber=4176491|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||07 Mar 2011 19:00|
|Last Modified:||07 Mar 2011 19:00|
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