Patent ID: 6477208
Filing Date: 2002-11-05
Classification: H03M,H04L

Abstract:
A trellis processing method for processing digitally modulated signal having an unknown and undesired phase component over a succession of processing intervals, comprising:generating path metrics in accordance with a composite trellis diagram having a plurality of states, each path metric being indicative of a likelihood associated with a path through the composite trellis diagram to an associated state in the composite trellis diagram, the likelihood being determined responsive to the signal processed, the composite trellis diagram including: exactly one component trellis diagram that is a phase displaced version of a root trellis diagram which spans a plurality of processing intervals; and a plurality of phase migration transitions each connecting a â€œfrom stateâ€  in the component trellis diagram to a â€œto stateâ€  in the component trellis diagram indicating that phase migration is permitted between said â€œfrom stateâ€  and said â€œto stateâ€ .