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论文类型： 期刊论文

发表时间： 2017-06-01

发表刊物： AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS

收录刊物： SCIE、EI

卷号： 76

页面范围： 77-85

ISSN号： 1434-8411

关键字： Adaptive beamforming; Widely linear; Mismatch; Variable diagonal loading

摘要： We propose a robust widely linear (WL) beamformer for noncircular (NC) signals in the presence of angle of arrival (AOA) errors or array random perturbations. In our beamformer, the block conjugate structure of covariance matrix is exploited to avoid updating the full weight vector, which reduces the computational loads. We add a variable diagonal loading term in the weight vector to improve the robustness of the WL beamformer. Moreover, the orthogonality constraint of block matrix is not required to calculate the amount of diagonal loading. Computer-simulation results show that the proposed WL beamforming provides improved performance over the conventional linear beamformers for NC signals in the presence of AOA errors and array random perturbations. (C) 2017 Elsevier GmbH. All rights reserved.