Patent ID: 8429504

Claim:
A receiving system, comprising: a signal receiving unit for receiving a broadcast signal comprising a data group having a plurality of regions, wherein at least one region of the plurality of regions includes first mobile data encoded at a 1/2 code rate, and wherein at least another region of the plurality of regions includes second mobile data encoded at a 1/4 code rate; a demodulating unit for demodulating the received broadcast signal; a first-decoder for performing block decoding on the first and second mobile data in the demodulated broadcast signal; and a second-decoder for performing error-correction decoding on a Reed-Solomon (RS) frame that comprises at least two packets including the block-decoded first and second mobile data, RS parity data generated based on the at least two packets and Cyclic Redundancy Check (CRC) data generated based on the at least two packets and the RS parity data, wherein: the data group includes a plurality of known data sequences and signaling information; at least two of the plurality of known data sequences have different lengths; and the signaling information includes information related to the data group.