Patent ID: 7733426

Claim:
A receiving system, comprising: a signal receiving unit for receiving a broadcast signal, the broadcast signal comprising mobile service data, a first known data sequence, a plurality of second known data sequences, and a transmission parameter, wherein the first known data sequence has a first pattern, wherein the plurality of second known data sequences each has a second pattern other than the first pattern mutually known by transmitting and receiving systems, wherein the transmission parameter is positioned between the first known data sequence and one of the plurality of second known data sequences, and wherein the first known data sequence and one of the plurality of second known data sequences differ from each other in length; a transmission parameter decoder for decoding the transmission parameter included in the broadcast signal and outputting block decoding information as a result of the decoding; a block decoder for performing block decoding on the mobile service data based on the block decoding information; and an error corrector for performing error correction decoding by an RS frame unit on the block-decoded mobile service data and correcting errors in the block-decoded mobile service data.