Patent ID: 8009662

Claim:
A method of processing digital broadcast data in a digital broadcast receiver, the method comprising: receiving a digital broadcast signal comprising main service data, mobile service data, and known data sequences, wherein the digital broadcast signal is processed in a digital broadcast transmitter by: randomizing mobile service data in a first randomizer, performing Reed-Solomon (RS) encoding and cyclic redundancy check (CRC) encoding on the randomized mobile service data, encoding the RS-CRC encoded mobile service data at a coding rate of 1/N, wherein N is an integer greater than 1, mapping the mobile service data encoded at the coding rate of 1/N into a data group and adding known data sequences, place holders for main service data, place holders for non-systematic RS parity data, and place holders for moving picture experts group (MPEG) header data to the data group, deinterleaving the data group, removing the place holders for the main service data and the place holders for the non-systematic RS parity data in the deinterleaved data group and replacing the place holders for the MPEG header data in the deinterleaved data group with the MPEG header data having a packet identifier (PID), thereby outputting mobile service data packets, multiplexing the mobile service data packets with main service data packets including the main service data, randomizing, by a second randomizer, the multiplexed main service data packets and the MPEG header data of the multiplexed mobile service data packets, performing systematic RS encoding on the main service data packets from the second randomizer, and performing non-systematic RS encoding on the mobile service data packets from the second randomizer, performing convolutional byte interleaving on the systematic RS-encoded main service data packets and the non-systematic RS-encoded mobile service data packets, and trellis encoding data in the interleaved data packets in a trellis encoding unit, wherein at least one memory included in the trellis encoding unit is initialized at each start of the known data sequences; demodulating the received digital broadcast signal; detecting the known data sequences from the digital broadcast signal; compensating channel distortion of the demodulated digital broadcast signal based on at least one of the detected known data sequences; and decoding the channel distortion compensated digital broadcast signal.