Results 21 to 30 of about 89,376 (355)

Discrete Quadratic-Phase Fourier Transform: Theory and Convolution Structures

open access: yesEntropy, 2022
The discrete Fourier transform is considered as one of the most powerful tools in digital signal processing, which enable us to find the spectrum of finite-duration signals.
Hari M. Srivastava   +3 more
doaj   +1 more source

Multiweighted-Type Fractional Fourier Transform: Unitarity

open access: yesFractal and Fractional, 2021
The definition of the discrete fractional Fourier transform (DFRFT) varies, and the multiweighted-type fractional Fourier transform (M-WFRFT) is its extended definition. It is not easy to prove its unitarity.
Tieyu Zhao, Yingying Chi
doaj   +1 more source

Circuit of Quantum Fractional Fourier Transform

open access: yesFractal and Fractional, 2023
In this paper, we first use the quantum Fourier transform (QFT) and quantum phase estimation (QPE) to realize the quantum fractional Fourier transform (QFrFT).
Tieyu Zhao, Yingying Chi
doaj   +1 more source

Discrete fractional Fourier transform [PDF]

open access: yes1996 IEEE International Symposium on Circuits and Systems. Circuits and Systems Connecting the World. ISCAS 96, 2002
The continuous fractional Fourier transform (FRFT) represents a rotation of signal in time-frequency plane, and it has become an important tool for signal analysis. A discrete version of fractional Fourier transform has been developed but its results do not match those of continuous case.
Pei, Soo-Chang, Yeh, Min-Hung
openaire   +2 more sources

The discrete fractional Fourier transformation [PDF]

open access: yesProceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96), 2002
Based on the fractional Fourier transformation of sampled periodic functions, the discrete form of the fractional Fourier transformation is obtained. It is found that for a certain dense set of fractional orders it is possible to define a discrete transformation. Also, for its efficient computation a fast algorithm, which has the same complexity as the
Arıkan, Orhan   +3 more
openaire   +2 more sources

Analytic solution of fractional jeffrey fluid induced by abrupt motion of the plate [PDF]

open access: yesMatrix Science Mathematic, 2018
This paper presents some new exact solutions corresponding to unsteady fractional Jeffrey fluid produced by a flat plate between two side walls perpendicular to the plate. The fractional calculus approach in the governing equations is used.
Amir Khan   +3 more
doaj   +1 more source

Fundamental solutions for semidiscrete evolution equations via Banach algebras

open access: yesAdvances in Difference Equations, 2021
We give representations for solutions of time-fractional differential equations that involve operators on Lebesgue spaces of sequences defined by discrete convolutions involving kernels through the discrete Fourier transform.
Jorge González-Camus   +2 more
doaj   +1 more source

Exact Relation Between Continuous and Discrete Linear Canonical Transforms [PDF]

open access: yes, 2009
—Linear canonical transforms (LCTs) are a family of integral transforms with wide application in optical, acoustical, electromagnetic, and other wave propagation problems. The Fourier and fractional Fourier transforms are special cases of LCTs.
Figen S. Oktem, Haldun M. Ozaktas
core   +1 more source

Eigenvectors of the Discrete Fourier Transform Based on the Bilinear Transform

open access: yesEURASIP Journal on Advances in Signal Processing, 2010
Determining orthonormal eigenvectors of the DFT matrix, which is closer to the samples of Hermite-Gaussian functions, is crucial in the definition of the discrete fractional Fourier transform.
Ahmet Serbes, Lutfiye Durak-Ata
doaj   +2 more sources

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