Results 31 to 40 of about 2,662 (145)
Defence Technology, 2014 Parameter estimation is analyzed using two kinds of common sampling-type DFRFT (discrete fractional Fourier transform) algorithm. A model of parameter estimation is established. The factors which influence estimation accuracy are analyzed.
Bing Deng, Jun-bao Luan, Shi-qi Cui
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A Fractional-Order Telegraph Diffusion Model for Restoring Texture Images with Multiplicative Noise
Fractal and Fractional, 2023 Multiplicative noise removal from texture images poses a significant challenge. Different from the diffusion equation-based filter, we consider the telegraph diffusion equation-based model, which can effectively preserve fine structures and edges for ...
Xiangyu Bai +5 more
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Multichannel Random Discrete Fractional Fourier Transform
IEEE Signal Processing Letters, 2015 We propose a multichannel random discrete fractional Fourier transform (MRFrFT) with random weighting coefficients and partial transform kernel functions. First, the weighting coefficients of each channel are randomized. Then, the kernel functions, selected based on a choice scheme, are randomized using a group of random phase-only masks (RPOMs).
Xuejing Kang, Feng Zhang, Ran Tao
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Discussion on Weighted Fractional Fourier Transform and Its Extended Definitions
Fractal and FractionalThe weighted fractional Fourier transform (WFRFT) has always been considered a development of the discrete fractional Fourier transform (FRFT). This paper points out that the WFRFT is a discrete FRFT of eigenvalue decomposition, which will change the ...
Tieyu Zhao, Yingying Chi
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Low complexity precoding codebook design based on DFRST for limited feedback precoded OSTBC systems
EURASIP Journal on Wireless Communications and Networking, 2017 Precoding techniques can be used in multiple input multiple output (MIMO) system to assign resources such as power and information optimally. This paper is concerned with limited feedback in precoded orthogonal space time block code (OSTBC) systems ...
Han Hai +3 more
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Efficient radar detection of weak manoeuvring targets using a coarse‐to‐fine strategy
IET Radar, Sonar & Navigation, 2021 Detection of weak manoeuvring targets has always been an important yet challenging task for radar signal processing. One primary reason is that target variable motions within a coherent processing interval generate energy migrations across multiple ...
Shengheng Liu +3 more
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Advances in Mathematical Physics, 2015 The unsteady flows of a generalized fractional Burgers’ fluid between two side walls perpendicular to a plate are studied for the case of Rayleigh-Stokes’ first and second problems.
Jianhong Kang, Yingke Liu, Tongqiang Xia
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DFRFT: A Classified Review of Recent Methods with Its Application
Journal of Engineering, 2013 In the literature, there are various algorithms available for computing the discrete fractional Fourier transform (DFRFT). In this paper, all the existing methods are reviewed, classified into four categories, and subsequently compared to find out the ...
Ashutosh Kumar Singh, Rajiv Saxena
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The Fractional Orthogonal Derivative
Mathematics, 2015 This paper builds on the notion of the so-called orthogonal derivative, where an n-th order derivative is approximated by an integral involving an orthogonal polynomial of degree n.
Enno Diekema
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Fractal and Fractional, 2023 In this paper, we propose a total fractional-order variation model for multiplicative noise removal and contrast enhancement of real SAR images. Inspired by the high dynamic intensity range of SAR images, the full content of the SAR images is preserved ...
Yamei Zhou +4 more
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