Low-complexity adaptive broadband beamforming based on the non-uniform decomposition method

Zhang, Shurui, Thiyagalingam, Jeyarajan ORCID: 0000-0002-2167-1343, Sheng, Weixing, Kirubarajan, Thia and Ma, Xiaofeng (2018) Low-complexity adaptive broadband beamforming based on the non-uniform decomposition method. SIGNAL PROCESSING, 151. pp. 66-75.

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Abstract

Sub-band adaptive processing is an established method to design a broadband beamformer. The uniform decomposition method (UDM) is a common approach for designing sub-band adaptive beamformer (SAB) that would split the received signal into a number of uniform sub-bands. However, the UDM has redundancies on decomposed sub-bands at high frequencies in the passband. In this paper, we propose a number of techniques to overcome this issue. By proposing a novel relative bandwidth method (RBM), we obtain that the relative bandwidth of each sub-band is the same. Using this as a basis, we present a non-uniform decomposition method (NUDM) such that the NUDM has fewer sub-bands than the conventional UDM, leading to reduced computational complexity. We also propose an elegant metric, adjacent bandwidth ratio (ABR), to facilitate easier comparison of non-uniformity. We then extend NUDM method to provide a fast variant of the non-uniform decomposition SAB (FNUD-SAB). We ensure that the sub-band frequencies and corresponding adaptive weights are available as part of the proposed FNUD-SAB method. With undistorted response to the desired signal and effective anti-jamming capability, the new beamformer reduces the computational complexity by reducing the number of sub-bands. Simulation results highlight the effectiveness of the proposed methods.

Item Type:	Article
Uncontrolled Keywords:	Broadband beamforming, Sub-band adaptive beamformer, Uniform decomposition method, Non-uniform decomposition
Depositing User:	Symplectic Admin
Date Deposited:	02 May 2018 15:15
Last Modified:	19 Jan 2023 06:34
DOI:	10.1016/j.sigpro.2018.05.003
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3020860