Patent ID: 8013941

Claim:
A digital television (DTV) receiver comprising: a tuner for receiving a broadcast signal including enhanced data in which a known data sequence is periodically repeated, wherein the enhanced data result from: pre-processing enhanced data; multiplexing enhanced data packets including the pre-processed enhanced data with main data packets; RS coding the multiplexed main and enhanced data packets by adding systematic RS parity data to the main data packets and adding non-systematic RS parity data to the enhanced data packets; interleaving the RS-coded main and enhanced data; and replacing at least a portion of the non-systematic RS parity data with new RS parity data which are recalculated for backward compatibility; an information detector for detecting location information of the known data sequence and a coarse frequency offset value of the broadcast signal; a demodulator for demodulating the broadcast signal by estimating a fine frequency offset value using the detected location information and by compensating a frequency offset of the broadcast signal using the coarse and fine frequency offset values; and a channel equalizer for compensating channel distortion of the demodulated signal using the detected location information.