Adaptive Beamforming in the Presence of Coherent Signals with Unknown Angles of Arrival

Yang-Ho CHOI  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.5   pp.1240-1247
Publication Date: 2010/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1240
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
adaptive beamforming,  coherent signals,  direction estimation,  alternating maximization,  

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To handle coherent signals with unknown arrival angles, an adaptive beamforming method is proposed which can be applied to an arbitrary array. The proposed method efficiently solves a generalized eigenvalue problem to estimate the arrival angles of the desired coherent signal group, by exploiting the Brent method in conjunction with alternating maximization. We discuss the condition for the correct direction estimation without erroneously taking interference direction estimates for the desired ones. Simulation results show that the performance of the proposed beamformer is very similar to that of the beamformer with the exact composite steering vector (CSV).