A new approach in the problem of phase detectors is presented. The procedure is started from the optimum design of digital phase locked loop (DPLL) and some fundamental aspects as the state equations for the communication model are preserved. The purpose of this paper is to point out the relationships between MAP and optimum estimators. We also show how previous adaptative linear filter of the signal error can be introduced to achieve high levels of quality on the estimate without great computational load. This preprocessing can be interpreted in terms of dissimilarity between input signal and noise spectrum. Finally, we give a heuristic exposition which sacrifices some amount of rigor in order to gain insight into the basic ideas involved.

Peer Reviewed