Work

Optimal wideband digital fractional-order differentiators using gradient based optimizer

Year: 2024

Type: article

Abstract: In this paper, we propose a novel optimization approach to designing wideband infinite impulse response (IIR) digital fractional order differentiators (DFODs) with improved accuracy at low frequency bands. In the new method, the objective function is formulated as an optimization problem with two tuning parameters to control the error distribution over frequencies. The gradient based optimizer (GBO) is effectively employed on the proposed objective function. A wide range of design examples are presented to illustrate the effectiveness of the proposed approach. The proposed approximations are compared to those of recent literature in terms magnitude, phase, and group delay errors. The result reveal that our method can attain approximations have a favorable low frequency performance (with about 60% of relative magnitude error reduction) and maintain a comparable accuracy at most of the Nyquist band to those of the existing ones. Thus, our approximations can be attractive for low frequency applications.

Source: PeerJ Computer Science

DOI: 10.7717/peerj-cs.2341

Authors: Mohammed Ali Mohammed Moqbel, Talal Ahmed Ali Ali, Zhu Xiao

Institution: Hunan University

Language: English

Topic: Digital Filter Design and Implementation

Subfield: Signal Processing

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,395

Funder: Basic and Applied Basic Research Foundation of Guangdong Province