Sparsity‐optimised farrow structure variable fractional delay filter for wideband array

Autor: Wenjing Zhou, Mingwei Shen, Min Xu, Guodong Han, Yudong Zhang
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: IET Signal Processing, Vol 17, Iss 6, Pp n/a-n/a (2023)
Druh dokumentu: article
ISSN: 1751-9683
1751-9675
DOI: 10.1049/sil2.12228
Popis: Abstract In this paper, a new sparsity‐optimised Farrow structure variable fractional delay (SFS‐VFD) filter is proposed to address the aperture effect in wideband array. Our method is based on coefficient (anti‐)symmetry and optimises the number and orders of its sub‐filters, greatly reducing the non‐zero coefficients. The established cost function is formulated as a parametric minimisation problem with multiple regularisation constraints, and solved by the modified three‐block alternating direction multiplier method (MTB‐ADMM), which is improved by introducing core variable correction items to ensure stable and fast convergence. Experimental results show that the SFS‐VFD filter reduces the complexity of the system by decreasing the use of multipliers and adders while ensuring high delay accuracy. In wideband array, the SFS‐VFD filter effectively corrects the aperture effect and achieves precise beam pointing.
Databáze: Directory of Open Access Journals
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