Results 41 to 50 of about 2,868,537 (226)
Journal of Algorithms & Computational Technology, 2009 In shallow water areas, to enhance underwater targets detection performance improve computation efficiency of active sonar, a computationally efficient adaptive beamformer (spatial filter) based on inverse QR (IQR) and recursive least-squares (RLS) is ...
Q. Wang, X. Pan
doaj +1 more source
Mitigating Multiple Moving Interferers With the Hybrid Double Zero MVDR Beamformer
IEEE AccessInterferers with a high bearing rate challenge the ability of the minimum variance distortionless response (MVDR) beamformer to place accurate notches in the direction of the interferer.
Savas Erdim, John R. Buck
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Null Broadening Robust Beamforming Based on Decomposition and Iterative Second-order Cone Programming [PDF]
Radioengineering, 2021 To solve the problem that the performance of adaptive beamformer degrades severely in the presence of steering vector mismatch or non-stationary interference, a null broadening robust beamforming based on decomposition and iterative second-order cone ...
W. Jin, Y. Z. Guo, W. M. Jia, J. W. Zhao
doaj
Phased-MIMO Radar: A Tradeoff Between Phased-Array and MIMO Radars [PDF]
, 2009 We propose a new technique for multiple-input multiple-output (MIMO) radar with colocated antennas which we call phased-MIMO radar. The new technique enjoys the advantages of MIMO radar without sacrificing the main advantage of phased-array radar which ...
Aboulnasr Hassanien +2 more
core +2 more sources
Adaptive Beamforming With Continuous/Discrete Phase Shifters via Convex Relaxation
IEEE Open Journal of Antennas and Propagation, 2022 Adaptive antenna array employing phase shifters only can reduce the hardware cost and power consumption, but the related optimization is well understood to be difficult to solve.
Yinman Lee
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On convergence of the auxiliary-vector beamformer with rank-deficient covariance matrices [PDF]
, 2009 The auxiliary-vector beamformer is an algorithm that generates iteratively a sequence of beamformers which, under the assumption of a positive definite covariance matrix R, converges to the minimum variance distortionless response beamformer, without ...
Besson, Olivier +2 more
core +1 more source
IEEE Access, 2018 This paper proposes a new division-free generalized sidelobe canceller-based adaptive beamformer and its efficient hardware realization. A discrete cosine transform-based blocking matrix is proposed for uniform linear array to decorrelate the input so as
W. Zhao +3 more
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Location‐Assisted Graph‐Based User Scheduling in Multi‐User MIMO LEO NTN Systems
International Journal of Satellite Communications and Networking, EarlyView.ABSTRACT This paper addresses user clustering and scheduling for multi‐user MIMO low Earth orbit nonterrestrial network systems in full frequency reuse. Since the number of on‐ground user terminals is usually much higher than the number of on‐board LEO satellite antennas, user scheduling becomes a fundamental task.
Bilal Ahmad +4 more
wiley +1 more source
Effective Dereverberation with a Lower Complexity at Presence of the Noise
Applied Sciences, 2022 Adaptive beamforming and deconvolution techniques have shown effectiveness for reducing noise and reverberation. The minimum variance distortionless response (MVDR) beamformer is the most widely used for adaptive beamforming, whereas multichannel linear ...
Fengqi Tan, Changchun Bao, Jing Zhou
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Deep Learning-based Universal Beamformer for Ultrasound Imaging
, 2019 In ultrasound (US) imaging, individual channel RF measurements are back-propagated and accumulated to form an image after applying specific delays. While this time reversal is usually implemented using a hardware- or software-based delay-and-sum (DAS ...
AC Jensen +6 more
core +1 more source