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Pruning the decimation in-time FFT algorithm

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1 Author(s)
Skinner, D.P. ; Naval Coastal Systems Laboratory, Panama City, FL.

Significant time-saving can be achieved by a simple modification to the radix-2 decimation in-time fast Fourier transform (FFT) algorithm when the data sequence to be transformed contains a large number of zero-valued samples. The time-saving is accomplished by replacing M - L stages of the FFT computation with a simple recopying procedure where 2Mis the total number of points to be transformed of which only 2Lare nonzero.

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Acoustics, Speech and Signal Processing, IEEE Transactions on  (Volume:24 ,  Issue: 2 )