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Everything about Prime-factor FFT algorithm

Fast Fourier Transform algorithm

The prime-factor algorithm (PFA), also called the Good–Thomas algorithm (1958/1963), is a fast Fourier transform (FFT) algorithm that re-expresses the discrete Fourier transform (DFT) of a size N = N1N2 as a two-dimensional N1 × N2 DFT, but only for the case where N1 and N2 are relatively prime. These smaller transforms of size N1 and N2 can then be evaluated by applying PFA recursively or by using some other FFT algorithm. Wikipedia →

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  1. Read the overview: Prime-factor FFT algorithmA 5-minute orientation
  2. Skim a recent paper: A Method to Obtain Non-Power-of-Two FFT Flow Graphs Based on a New Prime Factor AlgorithmInfluential work since 2022
  3. Pick up a classic book: Mathematical Techniques in Chrystallography and Materials ScienceThe most-reprinted book on the subject
  4. Read the landmark paper: A prime factor FFT algorithm using high-speed convolutionCited 240 times
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