Patent ID: 7027499
Filing Date: 2006-04-11
Classification: H04L

Abstract:
1. Apparatus for processing an equalizer output signal formed by transmitting an alternate mark inversion input signal over a channel and passing the transmitted signal through an adaptive equalizer, comprising: a correlator circuit block, with means for calculating an estimate of an autocorrelation function of the equalizer output signal, that detects an incorrect convergence of the adaptive equalizer and outputs a correlator output signal; and a corrector filter that receives the equalizer output signal and the correlator output signal, and applies a correction to the equalizer output signal based on the correlator output signal, to form a corrected signal that is substantially a time delayed copy of the input signal wherein the autocorrelation function calculating means performs the calculation according to the equation: where R is the estimate of the autocorrelation function, m is an integer which varies from 1 to a maximum expected length for an impulse response function of the channel, y is the equalizer output signal, i is an index, and S is a number of iterations used for the calculation.