The additive FFT algorithms of the preceeding two chapters make no explicit use of the multiplicative structure of the indexing set. We will see how this multiplicative structure can be applied, in the case of transform size N = RS, where R and S are relatively prime, to design a FT algorithm, similar in structure to these additive algorithms, but no longer requiring the twiddle factor multiplication. The idea is due to Good  in 1958 and Thomas  in 1963, and the resulting algorithm is called the Good-Thomas Prime Factor algorithm (PFA).
KeywordsDiscrete Fourier Transform Permutation Matrix Index Point Permutation Matrice Multiplicative Structure
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