Patent ID: 8514960

Claim:
An apparatus for improving a performance of a pre-equalizer in a transmitter of a digital broadcasting system having a feedback path for adaptively generating a filter coefficient of the pre-equalizer, comprising: a reference signal generator that generates a reference radio frequency (RF) signal; a feedback path estimator that estimates transmission band characteristic information for the feedback path based on the reference RF signal generated from the reference signal generator; and a feedback path compensator that compensates a demodulated signal transferred through the feedback path based on the estimated transmission band characteristic information from the feedback path estimator and generates a filter coefficient of the pre-equalizer, wherein the feedback path estimator estimates the transmission band characteristic information for the feedback path by comparing a digital IF signal generated by converting a reference RF signal, which is generated from the reference signal generator while the reference frequency signal is passing through the feedback path, with the reference signal from the reference signal generator.