Results 131 to 140 of about 1,760 (173)
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Robust Adaptive Beamforming with Sidelobe Controlled
Proceedings of the 9th International Conference on Signal Processing Systems, 2017High sidelobe level and model mismatches, such as general steering vector (SV) mismatches, are two major disadvantages of the minimum variance distortionless response (MVDR) beamforming. To suppress the sidelobe for interference nulling when encountering a mismatch problem, we propose a novel robust adaptive beamforming (RAB) technique with controlled ...
Peng Li +6 more
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Robustness of an Adaptive Beamforming Method for Hearing Aids
Acta Oto-Laryngologica, 1990We describe the results of computer simulations of a multimicrophone adaptive-beamforming system as a noise reduction device for hearing aids. Of particular concern was the system's sensitivity to violations of the underlying assumption that the target signal is identical at the microphones. Two-and four-microphone versions of the system were tested in
P M, Peterson +3 more
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A fast and robust adaptive beamformer
2001 CIE International Conference on Radar Proceedings (Cat No.01TH8559), 2002Based on a unitary transformation, improved adaptive beamforming via orthogonal projection is proposed. The new algorithm firstly transforms a complex-valued covariance matrix into a real-valued matrix by means of a unitary transformation, then eigen-decomposes the transformed matrix for adaptive beamforming.
null Luo Yongjian +2 more
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Robust adaptive beamforming with null-pattern constraints
Signal Processing, 2020Abstract Robust adaptive beamforming (RAB) technique is designed to avoid self-cancelation in the presence of mismatch between the nominal and actual models. In this paper, we have made the following three main contributions: 1) we show that the ripple control over the steering vector uncertainty set can be transformed to a norm constraint for the ...
Jie Zhuang +3 more
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2009
In this chapter, we first review the background, basic principle and structure of adaptive beamformers. Since there are many robust adaptive beamforming methods proposed in literature, for easy understanding, we organize them into two categories from the mathematical point of view: one is based on quadratic optimization with linear and nonlinear ...
Zhu Liang Yu +3 more
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In this chapter, we first review the background, basic principle and structure of adaptive beamformers. Since there are many robust adaptive beamforming methods proposed in literature, for easy understanding, we organize them into two categories from the mathematical point of view: one is based on quadratic optimization with linear and nonlinear ...
Zhu Liang Yu +3 more
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Fast adaptive beamforming robust to array imperfections
Signal Processing, 1993Abstract A time-recursive Givens rotation algorithm with a sliding window scheme is presented. The proposed beamformer based on the Givens rotation algorithm with added artificial noise is robust to array imperfections and converges rapidly. Since the current estimated weight vector of the proposed beamformer is based only on information contained in
W.S.Youn, C.K.Un
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Robust adaptive beamforming based on the eigenstructure method
IEEE Transactions on Signal Processing, 1994In a linearly constrained beamformer with imperfect arrays, the authors investigate the cause of cancelling the desired signal from a viewpoint based on the eigenstructure properties of the array covariance matrix. Based on this cause, they propose a robust beamforming algorithm.
Won Sik Youn, Chong Kwan Un
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Norm and coefficient constraints for robust adaptive beamforming
Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03., 2003Norm-constrained and coefficient-constrained adaptive filters are often used in robust adaptive beamforming to mitigate the target-signal cancellation problem caused by DOA (direction of arrival) mismatch. The norm and coefficient constraints are usually selected numerically based on computer simulations or real-time experiments, which is not enough ...
Qiyue Zou +2 more
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A robust adaptive binaural beamformer for hearing devices
2017 51st Asilomar Conference on Signals, Systems, and Computers, 2017In a hearing aid application, the performance of an adaptive beamformer is sensitive to errors in the acoustic transfer function or noise estimation. The estimation errors can be caused by factors including the head movement of the hearing aid users, non-stationarity of the environment, or imperfect array calibration.
Jinjun Xiao +3 more
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Robust wavefield interpolation for adaptive wideband beamforming
Signal Processing, 2008In this paper we consider the application of interpolation-based focusing for wideband array processing and direction finding using wavefield interpolation matrices. The focusing approach exploits the wideband characteristic of the signals for coherent subspace processing, achieving improved performance and reduced computational complexity.
Miriam A. Doron, Amir Nevet
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