When applied to decision feed back equahzation (DFE), the conventional minimum mean square error (MMSE) design approach is shown to be deficient in performance, making a number of recent contributions in the literature questionable. By taking into account the adverse effects of the nonlinear recursive character of the DFE which makes its presence felt in the error propagation phenomenon, a modified MMSE criterion is developed. Our modified design approach is based on reducing the damaging effect of large taps in the feedback path by combining two MMSE designs so as to reduce symbol error rate.
['Shazia Hasnie', 'Rodney A. Kennedy', 'Raúl A. Casas', 'Rick Johnson']
Constrained MMSE Approach To Equalizer Design