Patent ID: 6314135
Filing Date: 2001-11-06
Classification: H03H,H04L

Abstract:
In a data communication system having a transmitter with a precoder the precoder having precoder coefficients, the precoder further having a precoder signal, where the precoder signal is coupled to a receiver via an equivalent channel, where the output of the equivalent channel is a receiver signal, an apparatus for generating increments of said precoder coefficients comprising:a modulo device for converting the receiver signal into modulo receiver signal;a detector for receiving the modulo receiver signal and assigning values to the modulo receiver signal thereby generating a receiver coded data signal;a summer for subtracting the modulo receiver signal from the receiver coded data signal to produce a first error signal;a duplicate precoder for receiving and processing the receiver coded data signal thereby generating a duplicate precoder signal;a correction filter coupled to the output of the duplicate precoder and generating a correction filter signal where the output of the correction filter is added to the first error signal to generate a second error signal; andan update device coupled to the respective outputs of the correction filter and the duplicate precoder and having an update algorithm to update the correction filter coefficients of the correction filter.