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Published in:
2013 | OriginalPaper | Chapter
8. Quantization Error According to Bit Truncation Method in 4k-FFT Algorithm
Authors : Sangjung Ra, Dongjoon Choi, Namho Hur, Sangjin Ryoo, Cheolsung Kim
Published in: Future Information Communication Technology and Applications
Publisher: Springer Netherlands
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Abstract
In this paper, we compare a quantization error performance of FFT algorithm according to bit truncation method. 4k-FFT algorithm of OFDM is proposed and implemented in field programmable gate arrays (FPGAs). We analyze the quantization error performance according to bit truncation method. Measured results show the maximum quantization error of 6.042152/6.067595 (real/imaginary value in 12 stage MSB truncation), 3.112953/2.627594 (real/imaginary value in 12 stage LSB truncation), 0.006065/0.005448 (real/imaginary value in 6 stage LSB/6 stage MSB truncation) in 1st method. And measured results show the maximum quantization error of 0.001464/0.00129 (real/imaginary value in truncation after FFT) in 2nd method.