Some New Parallel Fast Fourier Transform Algorithms

• Published in: Sixth International Conference on Parallel and Distributed Computing Applications and Technologies (PDCAT'05) pp. 624 - 628
• Main Authors: Zhong Cui-xiang, Han Guo-qiang, Huang Ming-he
• Format: Conference Proceeding
• Language: English
• Published: IEEE 2005
• Subjects: Algorithm design and analysis; Application software; Computer science; Concurrent computing; Discrete Fourier transforms; Educational institutions; Fast Fourier transforms; Image processing; Multiprocessing systems; Signal processing
• ISBN: 0769524052; 9780769524054
• ISSN: 2379-5352
• DOI: 10.1109/PDCAT.2005.224

Discrete Fourier transform (DFT) has many applications in digital signal and image processing and other scientific and technological domains, but its time complexity of direct computation is O(n2), limiting greatly its application range. Thus many people have developed fast Fourier transform (FFT) algorithms, reducing the complexity from O(n2) to O(nlogn)(In this paper logn denotes log2n).But for large n, O(nlogn) is still very high. So multiprocessor systems have been used to speed up the computation of DFT. This paper first introduces a new general method to deduce FFT algorithms, then transforms the deduced second radix-2 decimation-in-time FFT algorithm into another parallelizable sequential form, and finally transforms the latter algorithm into a new parallel FFT algorithm, reducing the time complexity of DFT to O(nlogn/p) (where p is the number of processors). Using similar methods, the authors can also design other new parallel 1-D and 2-D FFT algorithms.