This invention provides means for processing a received digitally-modulated carrier signal to coherently demodulate or, for some applications, coherently demodulate and decode said signal when the signal's phase has an undesired component and/or to generate successive estimated values of said undesired...http://www.google.fr/patents/US5974091?utm_source=gb-gplus-shareBrevet US5974091 - Composite trellis system and method
