Patent ID: 6778622
Filing Date: 2004-08-17
Classification: H04L

Abstract:
A method for estimating an average sample timing error in samples taken of a signal comprising a plurality of measured tones, each measured tone having a frequency, a phase, and a magnitude, each measured tone representing one of a plurality of modulated carriers, each carrier having an associated constellation of ideal tones, each ideal tone representing an ideal modulation of its associated carrier, the method comprisingperforming the following processing on each of a subset of the measured tones in the signal; selecting an unprocessed measured tone; adjusting a phase of the selected measured tone using an average phase error; estimating a phase error for the selected measured tone; and updating the average phase error with the estimated phase error, wherein estimating the phase error for the selected measured tone comprisesslicing the selected measured tone to associate it with an ideal tone; computing a slicing residual for the selected measured tone; computing the estimated phase error for the selected measured tone using the slicing residual; and normalizing the estimated phase error.