A note on "An accurate error analysis model for fast Fourier transform"
The expressions derived by Ma (see ibid., vol.45, p.1641, 1997) for error variance and average power expectation using the model that has been proposed are not accurate. In this paper, all the possible correlations have not been considered. The expressions have been modified to make them exact. Closed-form expressions for the correlation between errors of different stages have been derived. The expressions have been verified by comparing the predicted values using these expressions with the simulation values given by Ma.