Results 41 to 50 of about 89,376 (355)
Implementation of Goertzel-based frequency estimation for power quality monitoring in embedded measurement systems [PDF]
Metrology and Measurement Systems, 2022 International standards from IEC and IEEE regulate power grid parameters such as theRMSvalue, frequency, harmonic and interharmonic distortion, unbalance or the presence of transients, that are important to assure the quality of distributed power ...
Nuno M. Rodrigues +2 more
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Waveform Design and DoA-DoD Estimation of OFDM-LFM Signal Based on SDFnT for MIMO Radar
IEEE Access, 2023 In comparison to orthogonal frequency division multiplexing (OFDM), the OFDM linear frequency modulation (OFDM-LFM) signal has similar time-bandwidth product, lower peak-to-average power ratio, and higher sensitivity to Doppler frequency shift, making it
Jingqi Wang +3 more
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Optica Applicata, 2021 We present a novel encryption method for multiple images in a discrete multiple-parameter fractional Fourier transform scheme, using complex encoding, theta modulation and spectral fusion.
Guangyu Luan, Z. Zhong, Mingguang Shan
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Separation of Overlapping Linear Frequency Modulated (LFM) Signals Using the Fractional Fourier Transform [PDF]
, 2010 Linear frequency modulated (LFM) excitation combined with pulse compression provides an increase in SNR at the receiver. LFM signals are of longer duration than pulsed signals of the same bandwidth; consequently, in many practical situations, maintaining
Cowell, DMJ, Freear, S
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Journal of Computer Networks and Communications, 2016 We present the exact symbol error rate (SER) expression for quadrature phase shift keying (QPSK) modulation in frequency selective Rayleigh fading channel for discrete fractional Fourier transform- (DFrFT-) based orthogonal frequency division ...
Atul Kumar +3 more
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Engineering Science and Technology, an International Journal, 2021 The paper proposes an unplanned island detection method in a microgrid with micro phasor measurement unit (μPMU). The μPMU extracts certain features, by using multi domain nature of discrete fractional Fourier transform, from measured voltage data and ...
Soham Dutta +2 more
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Continuous vs. discrete fractional Fourier transforms
Journal of Computational and Applied Mathematics, 1999 The authors consider discrete finite versions of the fractional integral Fourier transform, namely a fractionalization of the discrete Fourier transform (DFT) and the fractional Fourier-Kravchuk transform [cf. \textit{N. M. Atakishiyev} and \textit{K. B. Wolf}, Fractional Fourier-Kravchuk transform, J. Opt. Soc. Am. A 14, 1467-1477 (1997)].
Atakishiyev, Natig M. +2 more
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The Fourier U(2) Group and Separation of Discrete Variables [PDF]
, 2011 The linear canonical transformations of geometric optics on two-dimensional screens form the group $Sp(4,R)$, whose maximal compact subgroup is the Fourier group $U(2)_F$; this includes isotropic and anisotropic Fourier transforms, screen rotations and ...
Vicent, Luis Edgar, Wolf, Kurt Bernardo
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Image encryption using fractional integral transforms: Vulnerabilities, threats, and future scope
Frontiers in Applied Mathematics and Statistics, 2022 With the enormous usage of digital media in almost every sphere from education to entertainment, the security of sensitive information has been a concern.
Gurpreet Kaur +2 more
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Explicit Hermite-type eigenvectors of the discrete Fourier transform [PDF]
, 2015 The search for a canonical set of eigenvectors of the discrete Fourier transform has been ongoing for more than three decades. The goal is to find an orthogonal basis of eigenvectors which would approximate Hermite functions -- the eigenfunctions of the ...
Kuznetsov, Alexey
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