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• W3113285752 abstract "Directly computing Fourier power spectra at fractional periods of real sequences can be beneficial in many digital signal processing applications. In this article, we present a fast algorithm to compute the fractional Fourier power spectra of real sequences. For a real sequence of length ofm=nl,we may deduce its congruence derivative sequence with a length of l. The discrete Fourier transform of the original sequence can be calculated by the discrete Fourier transform of the congruence derivative sequence. The relation of discrete Fourier transforms between the two sequences may derive the special features of Fourier power spectra of the integer and fractional periods for a real sequence. It has been proved mathematically that after calculating the Fourier power spectrum (FPS) at an integer period, the Fourier power spectra of the fractional periods related this integer period can be easily represented by the computational result of the FPS at the integer period for the sequence. Computational experiments using a simulated sinusoidal data and protein sequence show that the computed results are a kind of Fourier power spectra corresponding to new frequencies that cannot be obtained from the traditional discrete Fourier transform. Therefore, the algorithm would be a new realization method for discrete Fourier transform of the real sequence." @default.
• W3113285752 created "2020-12-21" @default.
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• W3113285752 date "2021-03-01" @default.
• W3113285752 modified "2023-10-13" @default.
• W3113285752 title "A Fast Algorithm for Computing the Fourier Spectrum of a Fractional Period" @default.
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• W3113285752 doi "https://doi.org/10.1089/cmb.2020.0269" @default.
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