T/2 soft decision feedback blind equalizer
Vladimir R. Krstić · 2004
T/2 soft DFE is the based on idea of transforming a classical DFE to a cascade of uncoupled linear devices. The crucial component of this cascade is a white filter, which supplies the linear T/2 FSE with uncorrelated samples. The adaptive whiting of input sequence is controlled by a stochastic gradient algorithm based on joint entropy maximization (JEM-W) criteria which introduces soft decision properties at the very beginning of blind equalization. Soft decisions probably smooth the error surface and allow the algorithm to escape from local minima.