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 enhanced data and known data sequences;
• a known data detector for detecting the known data sequences from the received broadcast signal;
• an equalizer for compensating a channel distortion of the broadcast signal using the detected known data sequences;
• a first decoder for first decoding the channel-distortion-compensated broadcast signal;
• a second decoder for second decoding enhanced data in the first-decoded broadcast signal;
• and
• a derandomizer for derandomizing the second-decoded enhanced data, wherein the enhanced data included in the received broadcast signal are generated in a broadcast transmitter by:
• convolutional encoding original enhanced data at a coding rate of 1/N, wherein N is greater than 1,
• deinterleaving the convolutional encoded original enhanced data,
• Reed Solomon (RS) encoding the deinterleaved original enhanced data,
• interleaving the RS-encoded original enhanced data, and
• trellis encoding, by a trellis encoder, the interleaved original enhanced data, wherein memories in the trellis encoder are initialized by initialization data at a start of at least one known data sequence, and wherein the initialization data are determined based on values of the memories.

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

• receiving, by a tuner, a broadcast signal including enhanced data and known data sequences;
• detecting, by a known data detector, the known data sequences from the received broadcast signal;
• compensating, by an equalizer, a channel distortion of the broadcast signal using the detected known data sequences;
• first decoding, by a first encoder, the channel-distortion-compensated broadcast signal;
• second decoding, by a second decoder, enhanced data in the first-decoded broadcast signal;
• and
• derandomizing, by a derandomizer, the second-decoded enhanced data, wherein the enhanced data included in the received broadcast signal are generated in a broadcast transmitter by:
• convolutional encoding original enhanced data at a coding rate of 1/N, wherein N is greater than 1,
• deinterleaving the convolutional encoded original enhanced data,
• Reed Solomon (RS) encoding the deinterleaved original enhanced data,
• interleaving the RS-encoded original enhanced data, and
• trellis encoding, by a trellis encoder, the interleaved original enhanced data, wherein memories in the trellis encoder are initialized by initialization data at a start of at least one known data sequence, and wherein the initialization data are determined based on values of the memories.