FINITE WORD LENGTH ANALYSIS OF THE RADIX-2$î2$ FFT (ThuAmPO4)
Author(s) :
Hernan Gonzalo Rey (Facultad de Ingenieria - Universidad de Buenos Aires, Argentina)
Cecilia Galarza (Facultad de Ingenieria - Universidad de Buenos Aires, Argentina)
Abstract : In this paper, we analyze the quantization error effects of the radix-2i2 FFT algorithm. We propose per tone models for the error power. This is a different approach from the common choice of a maximum or mean value over the spectrum. In particular, we treat three different errors: 1. due to input quantization, 2. due to coefficient quantization and 3. due to quantization after a multiplication. This analysis is applied to a DMT scheme. Simulation results agree with the theoretical predictions.

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