Abstract
AbstractA new equalizer structure, the noise prediction equalizer, was recently proposed in the literature, especially for applications in high speed digital subscriber line transmission systems. It consists of a decision feedback equalizer and an additional noise prediction filter. The calculation of its optimum tap weights in the mean square error sense yields a nonlinear system of equations, that can be solved by approximation in two different ways. The characteristics of the transmission channel and the additive noise determine which method yields the smaller mean square error. Even without approximations the minimum mean square error of the noise prediction equalizer exceeds that of a decision feedback equalizer with filters of equivalent lengths. In addition the noise prediction equalizer offers almost no advantage in comparison with the decision feedback equalizer for the adaptive filter adjustment.
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