Patent ID: 8488716

Claim:
A method for transmitting a broadcast signal in a transmitter, the method comprising; forming a data group including mobile data, non-systematic RS parity data, known data sequences, and trellis initialization data bytes, wherein the known data sequences are sequentially concatenated with the trellis initialization bytes; interleaving data in the data group, wherein the data group further includes a plurality of data blocks and scalable data blocks, wherein at least one block of the plurality of data blocks and the scalable data blocks includes the known data sequences inserted in a predetermined area of the at least one block; trellis encoding the interleaved data and initializing memories for the trellis encoding using initial bits of the trellis initialization data bytes in the interleaved data, wherein the initial bits of the trellis initialization data bytes are calculated using an exclusive-OR operation with predetermined memory values of the memories for the trellis encoding; transmitting a broadcast signal including the trellis encoded data during a slot, wherein the data groups further include a specified number of data packets and a scalable number of data packets, wherein the specified number of data packets includes data corresponding to the plurality of data blocks and the scalable number of data packets includes data corresponding to the scalable data blocks, and wherein the scalable number is up to 38.