Patent ID: 7203255
Filing Date: 2007-04-10
Classification: H04L

Abstract:
1. In a communication system in which a communication signal is sent from a transmitter to a receiver, the communication signal being defined into a series of successive sampling intervals at the receiver, each sampling interval having a plurality of modulated carriers at a corresponding plurality of frequencies, a method of correcting a phase value for a received modulated carrier at a pilot frequency, the method comprising: for each modulated carrier received at a pilot frequency, updating a corresponding phase value, the phase value being related to an initial training modulated carrier received at the pilot frequency; applying a non-linear filter function to one or more prior delta pilot phase values corresponding to one or more respective prior modulated carriers received at the pilot frequency to generate a filtered result value that resolves phase ambiguity; and correcting the phase value if a difference of the phase value and the filtered result value exceeds a threshold value in absolute magnitude.