Patent ID: 8428151

Claim:
A digital television (DTV) transmitting system comprising: a first randomizer configured to randomize enhanced data bytes; a byte to bit converter configured to convert the randomized enhanced data bytes into bit units, thereby outputting enhanced data bits; an encoder configured to encode each of the enhanced data bits at a code rate of 1/H and to output the encoded enhanced data bits in symbol units, wherein H>1; a symbol interleaver configured to interleave enhanced data symbols output from the encoder according to the following equation: ( i )={S× i ×( i+ 1)/2}modL, wherein 0≦i≦L−1, L≧B, L=2 n , n and S are integers, and B is a number of symbols being inputted to the symbol interleaver; a symbol to byte converter configured to convert the interleaved enhanced data symbols into byte units, thereby outputting enhanced data bytes; a group formatter configured to map the converted enhanced data bytes into data groups and to add known data sequences and signaling information to each of the data groups; and a second randomizer configured to randomize MPEG header data bytes of enhanced data packets including data in the data groups.