Patent ID: 8396161

Claim:
A transmitting system comprising: a first encoder for performing Reed-Solomon (RS) encoding and Cyclic Redundancy Check (CRC) encoding on enhanced data to generate an RS frame, wherein the RS frame comprises an RS frame payload including the enhanced data, RS parity data added at bottom ends of columns of the RS frame payload and Cyclic Redundancy Check (CRC) data added at right ends of rows of the RS frame payload having the RS parity data; a second encoder for encoding data in the RS frame at a code rate of 1/H, wherein H>1; a first interleaver for interleaving the encoded data in symbol units according to the following equation: P ( i )={ S×i ×( i+ 1)/2} mod L , wherein 0 ≦i≦L− 1 , L= 2 n , wherein n and S are integers; a first multiplexer for multiplexing enhanced data packets including the interleaved data with main data packets including main data; and a second interleaver for interleaving data in the multiplexed data packets, thereby outputting data groups, wherein each of the data groups comprises a first region having a plurality of segments, a second region having a plurality of segments and a third region having a plurality of segments, the second region being positioned between the first and third regions, the first and third regions including main data, RS parity data and enhanced data, the second region including enhanced data, known data sequences, signaling information and RS parity data but no main data, wherein at least two segments in the second region have different start positions of the known data sequences and wherein at least two of the known data sequences are spaced 16 segments apart.