Wideband Beampattern Synthesis Using Single Digital Beamformer With Integer Time Delay Filters

Existing wideband beampattern synthesis methods usually require multiple beamformers, each corresponding to one frequency bin, which results in excessive resource consumption in engineering practice. To alleviate the resource consumption of wideband array beamforming, we propose a novel time-domain...

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Veröffentlicht in:	IEEE transactions on antennas and propagation Jg. 70; H. 5; S. 3437 - 3449
Hauptverfasser:	Lu, Qinghui, Cui, Guolong, Liu, Ruitao, Yu, Xianxiang, Wang, Xiangrong, Kong, Lingjiang
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	New York IEEE 01.05.2022 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:	Algorithms Alternating optimization (AO) algorithm Approximation algorithms Array signal processing Beamforming Broadband Consumption convex approximation (CA) algorithm Integers interference nulling Mathematical analysis nonconvex optimization Optimization Polynomials Synthesis Time domain analysis Time lag Time-frequency analysis White noise Wideband wideband digital beamformer (DBF)
ISSN:	0018-926X, 1558-2221
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Abstract	Existing wideband beampattern synthesis methods usually require multiple beamformers, each corresponding to one frequency bin, which results in excessive resource consumption in engineering practice. To alleviate the resource consumption of wideband array beamforming, we propose a novel time-domain wideband digital beamformer that can control the beam shape over the whole bandwidth for interference mitigation by using only one set of amplitude-phase weights and integer time delay filters. To tackle the resultant optimization problem, two effective algorithms are introduced, and both can solve the problem within polynomial time. One is an alternating optimization algorithm that decomposes the original problem into multiple tractable subproblems iteratively. The other is the convex approximation algorithm that transforms the original problem into a series of second-order cone programming problems iteratively. The two algorithms exhibit their respective advantages in terms of convergence and computational complexity. Extensive numerical examples are presented to evaluate the proposed time-domain wideband beamforming strategy, highlighting that it can form a deep notch in any interested spatial-spectral region to suppress the strong interferences.
AbstractList	Existing wideband beampattern synthesis methods usually require multiple beamformers, each corresponding to one frequency bin, which results in excessive resource consumption in engineering practice. To alleviate the resource consumption of wideband array beamforming, we propose a novel time-domain wideband digital beamformer that can control the beam shape over the whole bandwidth for interference mitigation by using only one set of amplitude–phase weights and integer time delay filters. To tackle the resultant optimization problem, two effective algorithms are introduced, and both can solve the problem within polynomial time. One is an alternating optimization algorithm that decomposes the original problem into multiple tractable subproblems iteratively. The other is the convex approximation algorithm that transforms the original problem into a series of second-order cone programming problems iteratively. The two algorithms exhibit their respective advantages in terms of convergence and computational complexity. Extensive numerical examples are presented to evaluate the proposed time-domain wideband beamforming strategy, highlighting that it can form a deep notch in any interested spatial–spectral region to suppress the strong interferences.
Author	Yu, Xianxiang Wang, Xiangrong Lu, Qinghui Liu, Ruitao Kong, Lingjiang Cui, Guolong
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SubjectTerms	Algorithms Alternating optimization (AO) algorithm Approximation algorithms Array signal processing Beamforming Broadband Consumption convex approximation (CA) algorithm Integers interference nulling Mathematical analysis nonconvex optimization Optimization Polynomials Synthesis Time domain analysis Time lag Time-frequency analysis White noise Wideband wideband digital beamformer (DBF)
Title	Wideband Beampattern Synthesis Using Single Digital Beamformer With Integer Time Delay Filters
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