Patent ID: 8837618

Claim:
A transmission processing method comprising: an encoding step of encoding information bits into a codeword according to a low density parity check code with code rate 7/15 and a codeword length of 16200, the low density parity check code shown in Table 1: TABLE 1 Addresses of parity bit accumulators for the LDPC code with the code rate 7/15 and the codeword length of 16200 3 137 314 327 983 1597 2028 3043 3217 4109 6020 6178 6535 6560 7146 7180 7408 7790 7893 8123 8313 8526 8616 8638 356 1197 1208 1839 1903 2712 3088 3537 4091 4301 4919 5068 6025 6195 6324 6378 6686 6829 7558 7745 8042 8382 8587 8602 18 187 1115 1417 1463 2300 2328 3502 3805 4677 4827 5551 5968 6394 6412 6753 7169 7524 7695 7976 8069 8118 8522 8582 714 2713 2726 2964 3055 3220 3334 3459 5557 5765 5841 6290 6419 6573 6856 7786 7937 8156 8286 8327 8384 8448 8539 8559 3452 7935 8092 8623 56 1955 3000 8242 1809 4094 7991 8489 2220 6455 7849 8548 1006 2576 3247 6976 2177 6048 7795 8295 1413 2595 7446 8594 2101 3714 7541 8531 10 5961 7484 3144 4636 5282 5708 5875 8390 3322 5223 7975 197 4653 8283 598 5393 8624 906 7249 7542 1223 2148 8195 976 2001 5005 a bit-interleaving step of conducting parity interleaving and column-row interleaving on bits of the codeword obtained in the encoding step, the column-row interleaving being conducted with or without twist; a bit-to-cell demultiplexing step of demultiplexing a sequence of bits interleaved in the bit-interleaving step into 8 sequences of bits and permuting the 8 sequences of bits according to a predetermined permutation rule; a mapping step of mapping each of 8-bit cell words obtained in the bit-to-cell demultiplexing step, according to a 256QAM (Quadrature Amplitude Modulation) constellation, wherein letting v i denote a bit in the i th sequence of bits before the permutation (for i=0, 1, . . . 7), and letting b i denote a bit in the i th sequence of bits after the permutation (for i=0, 1, . . . 7), the predetermined permutation rule is: v 0 =b 2 , v 1 =b 6 , v 2 =b 0 , v 3 =b 1 , v 4 =b 4 , v 5 =b 5 , v 6 =b 3 , v 7 =b 7 .