Digital broadcasting system and method of processing data

A transmitting system, comprising:

• a first encoder for generating a Reed-Solomon (RS) frame payload having a size of (N*Kc) enhanced data bytes and performing RS encoding and cyclic redundancy check (CRC) encoding on the RS frame payload, thereby generating an RS frame, wherein N is a column size of the RS frame payload and Kc is a row size of the RS frame payload;
• a second encoder for performing encoding on data in the RS frame at a coding rate of G/H, wherein G<H;
• a group generator for generating a first data group comprising first, second and third regions, the second region being positioned between the first and third regions, the first region including K packets having main data and RS parity data, but no enhanced data, the second region including L packets having enhanced data, known data sequences, signaling information, and RS parity data but no main data, the third region including M packets having main data and RS parity data but no enhanced data, wherein K<M<L;
• an interleaver for interleaving the first data group to generate a second data group having fourth, fifth and sixth regions, the fifth region being positioned between the fourth and sixth regions, the fourth and sixth regions including main data, RS parity data, and enhanced data, the fifth region including enhanced data, known data sequences, signaling information, and RS parity data but no main data;
• a trellis encoder for trellis encoding the second data group;
• and
• a modulator for modulating a broadcast signal including the trellis-encoded second data group for data transmission.

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

• a signal generator for generating a first data group comprising first, second and third regions, the second region being positioned between the first and third regions, the first region including K packets having main data and RS parity data, but no enhanced data, the second region including L packets having enhanced data, known data sequences, signaling information, and RS parity data but no main data, the third region including M packets having main data and RS parity data but no enhanced data, wherein K<M<L;
• an interleaver for interleaving the first data group to generate a second data group having fourth, fifth and sixth regions, the fifth region being positioned between the fourth and sixth regions, the fourth and sixth regions including main data, RS parity data, and enhanced data, the fifth region including enhanced data, known data sequences, signaling information, and RS parity data but no main data;
• a trellis encoder for trellis encoding the second data group;
• and
• a modulator for modulating a broadcast signal including the trellis-encoded second data group.

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

• generating a first data group comprising first, second and third regions, the second region being positioned between the first and third regions, the first region including K packets having main data and RS parity data, but no enhanced data, the second region including L packets having enhanced data, known data sequences, signaling information, and RS parity data but no main data, the third region including M packets having main data and RS parity data but no enhanced data, wherein K<M<L;
• interleaving the first data group to generate a second data group having fourth, fifth and sixth regions, the fifth region being positioned between the fourth and sixth regions, the fourth and sixth regions including main data, RS parity data, and enhanced data, the fifth region including enhanced data, known data sequences, signaling information, and RS parity data but no main data;
• trellis encoding the second data group;
• and
• modulating a broadcast signal including the trellis-encoded second data group.

A DTV receiver for processing digital broadcast data, the DTV receiver comprising:

• a tuner for receiving a broadcast signal from a DTV transmitter, the broadcast signal resulting from a process comprising:
• generating a first data group comprising first, second and third regions, the second region being positioned between the first and third regions, the first region including K packets having main data and RS parity data, but no enhanced data, the second region including L packets having enhanced data, known data sequences, signaling information, and RS parity data but no main data, the third region including M packets having main data and RS parity data but no enhanced data, wherein K<M<L,
• interleaving the first data group to generate a second data group having fourth, fifth and sixth regions, the fifth region being positioned between the fourth and sixth regions, the fourth and sixth regions including main data, RS parity data, and enhanced data, the fifth region including enhanced data, known data sequences, signaling information, and RS parity data but no main data, and
• trellis encoding the second data group;
• an equalizer for compensating channel distortion of the received broadcast signal using the known data sequences;
• and
• a decoder for decoding the equalized broadcast signal.

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

• receiving a broadcast signal from a DTV transmitter, the broadcast signal resulting from a process comprising:
• generating a first data group comprising first, second and third regions, the second region being positioned between the first and third regions, the first region including K packets having main data and RS parity data, but no enhanced data, the second region including L packets having enhanced data, known data sequences, signaling information, and RS parity data but no main data, the third region including M packets having main data and RS parity data but no enhanced data, wherein K<M<L,
• interleaving the first data group to generate a second data group having fourth, fifth and sixth regions, the fifth region being positioned between the fourth and sixth regions, the fourth and sixth regions including main data, RS parity data, and enhanced data, the fifth region including enhanced data, known data sequences, signaling information, and RS parity data but no main data, and
• trellis encoding the second data group;
• compensating channel distortion of the received broadcast signal using the known data sequences;
• and
• decoding the equalized broadcast signal.