Patent ID: 6829297
Filing Date: 2004-12-07
Classification: H04L

Abstract:
An adaptive equalizer comprising:a decision device; an FIR filter coupled to the decision device; a DFE coupled to the decision device, the DFE producing a DFE output; a Viterbi decoder coupled to the decision device, the Viterbi decoder producing a reliability output and a decoded output; a mapper coupled to receive the decoded output of the Viterbi decoder and to generate a mapped and scaled output; wherein the error signal is generated by delaying the DFE output by a number of cycles equal to a number of cycles the Viterbi decoder uses to generate the reliability output and subtracting the delayed decoded output of the DFE from the mapped and sealed output of the mapper; wherein a magnitude of change in the coefficient of the adaptive equalizer is selected based at least in part upon the reliability output and at least in part upon the error signal.