Invention Grant
US08832171B2 Index generation scheme for prime factor algorithm based mixed radix discrete fourier transform (DFT) 有权
基于素数算法的混合基数离散傅里叶变换(DFT)的索引生成方案

Index generation scheme for prime factor algorithm based mixed radix discrete fourier transform (DFT)
Abstract:
In one embodiment, a processor performs a method of generating pipelined data read indexes and data write indexes for a Prime Factor Algorithm (PFA) Discrete Fourier Transform (DFT) without look-up tables. The processor is adapted to factorize an ‘N’ point PFA DFT into one or more mutually prime factors and zero or more non-prime factors, calculate a 0th column index for an ith row (Xi0), calculate an IndCor when the value of Xi0 equals zero and when a row number (i) does not equal zero, calculate Xij, generate the data read indexes, perform a DFT kernel computation on Lk point for the mutually prime factors and the non-prime factors, and generate the data write indexes for the mutually prime factors and the non-prime factors. Xij represents ith row and jth column of 2D input Buffer and enables a selection of a linear index from the 2D input buffer.
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