Results 141 to 150 of about 1,520,902 (172)
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Elimination of interference terms of the discrete Wigner distribution using nonlinear filtering
IEEE Transactions on Signal Processing, 2000Summary: Methods for interference reduction in the Wigner distribution (WD) have traditionally relied on linear filtering. This paper introduces a new nonlinear filtering approach for the removal of cross terms in the discrete WD. Realizing that linear smoothing kernels are unable to completely cancel the cross-terms without compromising time-frequency
Gonzalo R. Arce, Syed Rashid Hasan
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Discrete time and frequency Wigner-Ville distribution: Moyal's formula and aliasing
IEEE Signal Processing Letters, 2005In this letter, we propose a new definition of the discrete time and frequency Wigner-Ville distribution. The proposed distribution not only displays a readable representation (small aliasing) but also exhibits unitarity and is easy to compute. We compare the time-frequency representation associated with this proposed definition with other existing ...
Chassande-Mottin, Eric, Pai, Archana
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The development of a discrete transform for the Wigner distribution and ambiguity function
The Journal of the Acoustical Society of America, 1988A theoretical basis for the development of the discrete Wigner distribution and ambiguity function is presented that is based on the temporal and spectral properties of the two-dimensional Wigner kernel function. This two-dimensional description is helpful in visualizing the various functions and shows that the increase in the number of points required
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Roundoff error analysis of the discrete Wigner distribution using fixed-point arithmetic
IEEE Transactions on Signal Processing, 1991The issue of roundoff noise effects in the implementation of the discrete Wigner distribution using fixed-point arithmetic is addressed. The sign-magnitude number representation is assumed throughout the analysis. The measure of roundoff noise effects in an algorithm is the output noise-to-signal ratio.
Chintana Griffin +2 more
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IEEE Transactions on Signal Processing, 1994
The influence of noise on the Wigner distribution (WD) of discrete-time signals is analyzed. Signals contaminated by white noise are considered. The expressions for the mean and variance of the WD estimator are derived. It is then shown that the application of only one window is sufficient to make the variance of the estimator finite.
Ljubisa Stankovic, Srdjan Stankovic
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The influence of noise on the Wigner distribution (WD) of discrete-time signals is analyzed. Signals contaminated by white noise are considered. The expressions for the mean and variance of the WD estimator are derived. It is then shown that the application of only one window is sufficient to make the variance of the estimator finite.
Ljubisa Stankovic, Srdjan Stankovic
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Efficient computation of the discrete Wigner distribution function through a new iterative algorithm
1997 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2002This paper presents a new iterative method to speed up the DWDF computation. At present it has been considered from a computational point of view as a 1-D section of the Wigner kernel (WK)N point FTs. We purpose a new way to compute the DWDF based on the symmetry properties of the WK and the cosine function.
Isabel García +4 more
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Wigner distribution in linear canonical domains: properties and discretization
2019 IEEE International Conference on Signal, Information and Data Processing (ICSIDP), 2019In our previous work, we introduced a kind of closed-form linear canonical transform (LCT) based Wigner distribution (WD), namely, the closed-form instantaneous cross-correlation function type of WD (CICFWD), and discussed its applications in non-stationary signal separation and detection. However, some related theoretical foundations are still unknown.
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Elimination of cross-components of the discrete Wigner-Ville distribution via a correlation method
Proceedings of Third International Conference on Signal Processing (ICSP'96), 2002This paper presents a method to remove cross-components produced by the discrete Wigner-Ville distribution (WVD). The procedure consists of considering the WVD as an image and assigning each pixel to either an auto-component or a cross-component according to a correlation coefficient. This coefficient measures the correlation between the time-frequency
Grall-Maës, Edith, Beauseroy, Pierre
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Fast algorithm for pseudodiscrete Wigner–Ville distribution using moving discrete Hartley transform
IEE Proceedings - Vision, Image, and Signal Processing, 1996A new fast algorithm is proposed to compute pseudodiscrete Wigner-Ville distribution (PDWVD) in real-time applications. The proposed algorithm uses the moving discrete Hartley transform to compute the Hilbert transform and thereby implements the PDWVD in real domain.
K.M.M. Prabhu, R. Shanmuga Sundaram
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3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the, 2004
Traditional methods of interference reduction in the wigner distribution are based on linear filtering. Recently a new approach of nonlinear filtering was developed. The filter's behavior varies from an identifier to a low pass filter depends on the region of operating.
F. Khandan, A. Ayatollahi
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Traditional methods of interference reduction in the wigner distribution are based on linear filtering. Recently a new approach of nonlinear filtering was developed. The filter's behavior varies from an identifier to a low pass filter depends on the region of operating.
F. Khandan, A. Ayatollahi
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