Patent ID: 6553081
Filing Date: 2003-04-22
Classification: H04L

Abstract:
A precoding apparatus in a transmitter of a data communication system, said precoding apparatus having a data symbol sequence as an input and having a precoded data symbol sequence as an output, said precoding apparatus comprising:a modulo device for receiving an adjusted data symbol sequence that is based on said input data symbol sequence and for generating a modulo signal; and a circuit coupled to said modulo device for driving the DC output of said precoding apparatus to zero at a predetermined time, said circuit comprising: a compensator summer for adding said modulo signal and a compensation signal thereby obtaining an adjusted modulo signal; a compensator means for generating said compensation signal, said compensator means incorporating an integrator for obtaining a running sum of said adjusted modulo signal; and an insertion switch programmed to selectively set the output of said precoding apparatus to be said adjusted modulo signal prior to said predetermined time and, at said predetermined time, to set said output of the precoding apparatus to be the negative value of said running sum.