888,311 research outputs found
Macdonald's Evaluation Conjectures and Difference Fourier Transform
In the previous author's paper the Macdonald norm conjecture (including the
famous constant term conjecture) was proved. This paper contains the proof of
the remaining two (the duality and evaluation conjectures). The evaluation
theorem is in fact a -generalization of the classic Weyl dimension
formula. As to the duality theorem, it states that the generalized
trigonometric-difference zonal Fourier transform is self-dual (at least
formally). We define this transform in terms of double affine Hecke algebras
related to elliptic braid groups. The duality appeared to be directly connected
with the transposition of the periods of an elliptic curve.Comment: 16 pg., AMSTe
Macdonald's Evaluation Conjectures, Difference Fourier Transform, and Applications
This paper contains the proof of Macdonald's duality and evaluation
conjectures, the definition of the difference Fourier transform, the recurrence
theorem generalizing Pieri rules, and the action of GL(2,Z) on the Macdonald
polynomials at roots of unity.Comment: AMSTe
Sparse and Cosparse Audio Dequantization Using Convex Optimization
The paper shows the potential of sparsity-based methods in restoring
quantized signals. Following up on the study of Brauer et al. (IEEE ICASSP
2016), we significantly extend the range of the evaluation scenarios: we
introduce the analysis (cosparse) model, we use more effective algorithms, we
experiment with another time-frequency transform. The paper shows that the
analysis-based model performs comparably to the synthesis-model, but the Gabor
transform produces better results than the originally used cosine transform.
Last but not least, we provide codes and data in a reproducible way
About Calculation of the Hankel Transform Using Preliminary Wavelet Transform
The purpose of this paper is to present an algorithm for evaluating Hankel
transform of the null and the first kind. The result is the exact analytical
representation as the series of the Bessel and Struve functions multiplied by
the wavelet coefficients of the input function. Numerical evaluation of the
test function with known analytical Hankel transform illustrates the proposed
algorithm.Comment: 5 pages, 2 figures. Some misprints are correcte
The FFX Correlator
We established a new algorithm for correlation process in radio astronomy.
This scheme consists of the 1st-stage Fourier Transform as a filter and the
2nd-stage Fourier Transform for spectroscopy. The "FFX" correlator stands for
Filter and FX architecture, since the 1st-stage Fourier Transform is performed
as a digital filter, and the 2nd-stage Fourier Transform is performed as a
conventional FX scheme. We developed the FFX correlator hardware not only for
the verification of the FFX scheme algorithm but also for the application to
the Atacama Submillimeter Telescope Experiment (ASTE) telescope toward
high-dispersion and wideband radio observation at submillimeter wavelengths. In
this paper, we present the principle of the FFX correlator and its properties,
as well as the evaluation results with the production version.Comment: 20 figure
Corrections of the NIST Statistical Test Suite for Randomness
It is well known that the NIST statistical test suite was used for the
evaluation of AES candidate algorithms. We have found that the test setting of
Discrete Fourier Transform test and Lempel-Ziv test of this test suite are
wrong. We give four corrections of mistakes in the test settings. This suggests
that re-evaluation of the test results should be needed
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