Patent ID: 7739581

Claim:
A receiving system, comprising: a signal receiving unit for receiving a broadcast signal, the broadcast signal comprising a Reed-Solomon (RS) frame, which comprises K (K≧1) number of packets including A (A≧1) number of bytes of a first data, an RS parity data generated based on the K number of packets, and a Cyclic Redundancy Check (CRC) checksum data generated based on the K number of packets and the RS parity data, and a second data; a known data detector for detecting a plurality of known data sequences from the broadcast signal; a demodulating unit for demodulating the received broadcast signal; a block decoder for decoding the first data included in the demodulated broadcast signal, and outputting a soft decision value of the first data as a result of the decoding; and an RS frame decoder for building an RS frame from the soft decision value of the first data, the RS frame decoder correcting errors generated from the first data by performing first error decoding on the first data by the RS frame unit, wherein at least two of the plurality of known data sequences have different lengths, wherein signaling information is inserted between the plurality of known data sequences, and wherein the signaling information comprises data group information.