Abstract
This paper gives a new method to calculate the split-radix fast Fourier transform (SRFFT combining radix-2 FFT with radix-4 FFT) through quantifying the twiddle factors based on the real and imaginary parts of them. Compared with the existing algorithms, 2 main advantages from the proposed algorithm have been found. 1. The average dynamic range is increased by 2.34dB from the existing algorithms when SNR reaches 20dB. 2. The dynamic ranges of the proposed algorithm are all improved under different noise environment. The simulation results verify the better effectiveness of the proposed algorithm.
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