Design and characterisation of partial response decision feedback equaliser

Abstract

The partial response decision feedback equaliser (DFE) solution is derived by applying Wiener filter theory and the principle of orthogonality to obtain novel expressions for the optimum filter tap weights and the minimum mean square error (MSE). The effective filter lengths for the DFE are determined. The theoretical derivations are verified by simulations. The characteristics of optimum MSE behaviour under varying DFE parameters (channel filter, modulation filter, FFF length, detection delay, FBF length and channel noise) for different modulation signals are studied using simulations and some guidelines for effective DFE design are proposed.