Patent ID: 7363576
Filing Date: 2008-04-22
Classification: H03M,H04L

Abstract:
1. A method for processing a signal received from a dispersive channel using a reduced-state sequence estimation technique, said channel having a channel impulse response, said method comprising the steps of: precomputing partial intersymbol interference estimates for each of a plurality of postcursor taps of said channel impulse response, wherein said partial intersymbol interference estimates are based on each possible value for a data symbol; selecting a precomputed partial intersymbol interference estimate for each of said plurality of postcursor taps other than a first postcursor tap based on a past decision from a corresponding state, wherein a precomputed partial intersymbol interference estimate for a first postcursor tap is a precomputed inter symbol interference estimate; precomputing branch metrics based on said precomputed intersymbol interference estimate; selecting one of said precomputed branch metrics based on a past decision from a corresponding state; computing a new path metric for a path extension from a corresponding state based on said selected branch metrics; and determining a best survivor path into a state by selecting a path having a best new path metric among said corresponding computed new path metrics.