Dtv receiver and method of processing broadcast signal in dtv receiver

A DTV receiver comprising:

• a tuner for tuning to a channel to receive a broadcast signal including main and enhanced data, wherein at least one known data sequence is included in the enhanced data;
• a demodulator demodulating the broadcast signal;
• a known data sequence detector for detecting the known data sequence from the broadcast signal outputted from the tuner or from the demodulated signal;
• an equalizer compensating channel distortion of the demodulated signal using the detected known data sequence;
• a first decoder for decoding the main and enhanced data included in the equalized signal by calculating soft decision values for the enhanced data and hard decision values for the main data;
• a second decoder for Reed-Solomon (RS) decoding the decoded main and enhanced data for first forward error correction (FEC);
• a derandomizer for derandomizing the RS-decoded main and enhanced data;
• a packet de-formatter for de-formatting the derandomized enhanced data by removing the known data sequence;
• and
• a third decoder for decoding the de-formatted enhanced data for second forward error correction (FEC).

A method of processing a broadcast signal in a DTV receiver, the method comprising:

• tuning to a channel to receive a broadcast signal;
• demodulating the broadcast signal;
• decoding main and enhanced data included in the demodulated signal by calculating soft decision values for the enhanced data and hard decision values for the main data;
• decoding the decoded main and enhanced data for first forward error correction (FEC);
• and
• decoding the FEC-decoded enhanced data for second forward error correction (FEC).

A method of processing a broadcast signal in a DTV receiver, the method comprising:

• tuning to a channel to receive a broadcast signal including main and enhanced data, wherein at least one known data sequence is included in the enhanced data;
• demodulating the broadcast signal;
• detecting the known data sequence from the broadcast signal;
• equalizing the demodulated signal using the detected known data sequence;
• decoding the main and enhanced data included in the equalized signal by calculating soft decision values for the enhanced data and hard decision values for the main data;
• Reed-Solomon (RS) decoding the decoded main and enhanced data for first forward error correction (FEC);
• derandomizing the RS-decoded main and enhanced data;
• de-formatting the derandomized enhanced data by removing the known data sequence;
• and
• decoding the de-formatted enhanced data for second forward error correction (FEC).