Dtv transmitter and method of coding main and enhanced data in dtv transmitter

A digital television (DTV) transmitter for processing broadcast data, the DTV transmitter comprising:

• a pre-coder for pre-coding enhanced data for forward error correction (FEC);
• a data formatter for generating enhanced data packets including the pre-coded enhanced data;
• a first Reed-Solomon (RS) encoder for RS-coding the enhanced data packets with a non-systematic RS encoding scheme, wherein 47th, 48th, 49th, 50th and 51st bytes in at least one of the RS-coded enhanced data packets are non-systematic parity data;
• a data interleaver for interleaving data in the RS-coded enhanced data packets;
• and
• a trellis encoder for trellis-encoding the interleaved data, at least one memory included in the trellis encoder being initialized at a start of a known data sequence.

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

• pre-coding enhanced data for forward error correction (FEC);
• generating enhanced data packets including the pre-coded enhanced data;
• RS-coding, by a RS encoder, the enhanced data packets with a non-systematic RS encoding scheme, wherein 47th, 48th, 49th, 50th and 51st bytes in at least one of the RS-coded enhanced data packets are non-systematic parity data;
• interleaving, by a data interleaver, data in the RS-coded enhanced data packets;
• and
• trellis-encoding, by a trellis encoder, the interleaved data, at least one memory included in the trellis encoder being initialized at the beginning of a known data sequence.