Corpus ID: 210919910

Aliasing error of the exp$(\beta \sqrt{1-z^2})$ kernel in the nonuniform fast Fourier transform

  title={Aliasing error of the exp\$(\beta \sqrt\{1-z^2\})\$ kernel in the nonuniform fast Fourier transform},
  author={Alex H. Barnett},
  journal={arXiv: Numerical Analysis},
  • A. Barnett
  • Published 26 January 2020
  • Mathematics, Computer Science
  • arXiv: Numerical Analysis
The most popular algorithm for the nonuniform fast Fourier transform (NUFFT) uses the dilation of a kernel $\phi$ to spread (or interpolate) between given nonuniform points and a uniform upsampled grid, combined with an FFT and diagonal scaling (deconvolution) in frequency space. The high performance of the recent FINUFFT library is in part due to its use of a new ``exponential of semicircle'' kernel $\phi(z)=e^{\beta \sqrt{1-z^2}}$, for $z\in[-1,1]$, zero otherwise, whose Fourier transform… Expand
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