Dtv receiver and method of processing broadcast signal in dtv receiver

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, 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 wherein at least one known data symbol sequence has a repeated pattern;
• a demodulator for demodulating the received broadcast signal by performing carrier recovery on the received broadcast signal based on the repeated pattern of the at least one known data symbol sequence;
• a channel equalizer for estimating a channel impulse response based on the known data symbol sequences which are regularly spaced in the interleaved main data and enhanced data of the demodulated broadcast signal and compensating channel distortion of the demodulated broadcast signal based on the estimated channel impulse response;
• a deinterleaver for deinterleaving the enhanced data in the compensated broadcast signal;
• a Reed-Solomon (RS) decoder for RS decoding the deinterleaved enhanced data;
• and
• a derandomizer for derandomizing the RS-decoded enhanced data.

A method of processing broadcast data in a digital television (DTV) receiver, the method comprising:

• receiving, by a tuner, a broadcast signal including main data, enhanced data and known data symbol sequences,
• wherein the main data and the enhanced data are interleaved, 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 wherein at least one known data symbol sequence has a repeated pattern;
• demodulating, by a demodulator, the received broadcast signal by performing carrier recovery on the received broadcast signal based on the repeated pattern of the at least one known data symbol sequence;
• estimating, by a channel equalizer, a channel impulse response based on the known data symbol sequences which are regularly spaced in the interleaved main data and enhanced data in the demodulated broadcast signal and compensating channel distortion of the demodulated broadcast signal based on the estimated channel impulse response;
• deinterleaving, by a deinterleaver, the enhanced data in the compensated broadcast signal;
• Reed-Solomon (RS) decoding, by an RS decoder, the deinterleaved enhanced data;
• and
• derandomizing, by a derandomizer, the RS-decoded enhanced data.