Adaptive Beamforming with Sidelobe Suppression by Placing Extra Radiation Pattern Nulls

Ioannis P. Gravas, Zaharias D. Zaharis, Traianos V. Yioultsis, Pavlos Lazaridis, Thomas D. Xenos

Research output: Contribution to journalArticle

Abstract

A new iterative adaptive beamforming (ABF) algorithm based on conventional beamformers is proposed, in order not only to steer the main lobe towards a desired signal and
place radiation pattern nulls towards respective interference signals, but also to achieve a desired side lobe level (SLL). Thus, the algorithm becomes less susceptible to unpredicted interference signals than conventional beamformers. In each iteration, the algorithm finds the direction of the peak of the greatest side lobe, which is considered as direction of arrival (DoA) of a hypothetical interference signal, and the conventional beamformer is then employed to find proper antenna array weights that produce an extra null towards this direction. The iterative procedure stops when the desired SLL is obtained. The algorithm is applied on three conventional beamformers and is tested for various signal DoA, while the direction deviation of the main lobe and the nulls is recorded, to evaluate the algorithm in terms of robustness. The proposed algorithm needs a few
iterations to achieve the desired SLL, and thus is much faster than any evolutionary iterative method employed for side lobe suppression. Finally, unlike methods that employ neural networks, the proposed algorithm does not need any training to become functional.
LanguageEnglish
Article number8668532
Pages3853-3862
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Volume67
Issue number6
Early online date18 Mar 2019
DOIs
Publication statusPublished - 1 Jun 2019

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Beamforming
Signal interference
Direction of arrival
Iterative methods
Antenna arrays
Neural networks

Cite this

Gravas, Ioannis P. ; Zaharis, Zaharias D. ; Yioultsis, Traianos V. ; Lazaridis, Pavlos ; Xenos, Thomas D. / Adaptive Beamforming with Sidelobe Suppression by Placing Extra Radiation Pattern Nulls. In: IEEE Transactions on Antennas and Propagation. 2019 ; Vol. 67, No. 6. pp. 3853-3862.
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abstract = "A new iterative adaptive beamforming (ABF) algorithm based on conventional beamformers is proposed, in order not only to steer the main lobe towards a desired signal andplace radiation pattern nulls towards respective interference signals, but also to achieve a desired side lobe level (SLL). Thus, the algorithm becomes less susceptible to unpredicted interference signals than conventional beamformers. In each iteration, the algorithm finds the direction of the peak of the greatest side lobe, which is considered as direction of arrival (DoA) of a hypothetical interference signal, and the conventional beamformer is then employed to find proper antenna array weights that produce an extra null towards this direction. The iterative procedure stops when the desired SLL is obtained. The algorithm is applied on three conventional beamformers and is tested for various signal DoA, while the direction deviation of the main lobe and the nulls is recorded, to evaluate the algorithm in terms of robustness. The proposed algorithm needs a fewiterations to achieve the desired SLL, and thus is much faster than any evolutionary iterative method employed for side lobe suppression. Finally, unlike methods that employ neural networks, the proposed algorithm does not need any training to become functional.",
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Adaptive Beamforming with Sidelobe Suppression by Placing Extra Radiation Pattern Nulls. / Gravas, Ioannis P.; Zaharis, Zaharias D.; Yioultsis, Traianos V.; Lazaridis, Pavlos; Xenos, Thomas D.

In: IEEE Transactions on Antennas and Propagation, Vol. 67, No. 6, 8668532, 01.06.2019, p. 3853-3862.

Research output: Contribution to journalArticle

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