We continue to discuss why MMSE estimation arises in coding schemes that approach the capacity of linear Gaussian channels. Here we consider schemes that involve successive decoding, such as decision-feedback equalization or successive cancellation. “Everything should be made as simple as possible, but not simpler.”— A. Einstein.

The utilization of VoIP (Voice over IP) in UMTS networks requires the establishment of adequated rules in order to maximize the efficiency of transmission over the air interface. Here we will describe a technique, based on the reduction of voice packet overhead, with the objective of minimizing the power expended during a typical conversation.

We generalize l ocal l exicographic SSOR preconditioning for the Sheikholeslami-Wohlert improved Wilson fermion action and the truncated perfect free fermion action. In our test implementation we achieve performance gains as known from SSOR preconditioning of the standard Wilson fermion action.