Patent ID: 8050316

Claim:
A digital television (DTV) receiver comprising: a tuner for receiving a broadcast signal including main data, enhanced data and known data symbol sequences, wherein the main data and the enhanced data are interleaved, and wherein at least two of the known data symbol sequences are regularly spaced in the interleaved main data and enhanced data of the received broadcast signal and at least one known data symbol sequence has a repeated pattern; a demodulator for performing carrier recovery on the received broadcast signal based on at least one of the known data symbol sequences; a known data sequence detector for detecting a position of a known data symbol sequence from the demodulated broadcast signal based on the repeated pattern of the at least one known data symbol sequence in the interleaved main data and enhanced data; a channel estimator for estimating a channel impulse response using the known data symbol sequences which are regularly spaced in the interleaved main data and enhanced data in the demodulated broadcast signal; and a compensator for compensating channel distortion.