Signalling coding and modulation method and demodulation and decoding method and device

A signalling coding and modulation device, characterized in that the device comprises:

• a memory;
• and
• a processor, coupled with the memory and configured to:
• extend signalling which has been subjected to first predetermined processing according to an extension pattern table to obtain an extended codeword, and conducting predetermined coding on the extended codeword to obtain a encoded codeword;
• conduct parity bit permutation on parity bits in the encoded codeword and then adding the permutated parity bits to the end of information bits in the encoded codeword, to obtain a permutated encoded codeword;
• according to the length of the signalling, puncturing the permutated encoded codeword according to a predetermined puncturing rule to obtain a punctured encoded codeword;
• and
• conduct second predetermined processing on the punctured encoded codeword to obtain a tuple sequence, which is used for mapping, and then map the obtained tuple sequence into a signalling symbol according to a predetermined mapping rule, wherein
• the step of conducting parity bit permutation on parity bits in the encoded codeword and then adding permutated parity bits to the end of information bits in the encoded codeword, to obtain a permutated encoded codeword comprises:
• conducting first parity bit permutation on the parity bits to obtain a first permutated parity bits;
• dividing the first permutated parity bits into several continuous bit groups, exchanging the positions of the bit groups so that the πp(k) bit group before the exchange becomes the k bit group after the exchange to obtain a second permutated parity bits;
• and
• sequentially concatenating information bits and the second permutated parity bits to obtain the permutated encoded codeword,
• in the step of exchanging the positions of the bit groups so that the πp(k) bit group before the exchange becomes the k bit group after the exchange, it is determined according to a predetermined position permutation table, NLDPC denotes a length of the LDPC codeword:
• Predetermined position permutation table
• π
• p
• ⁡
• (
• 0
• )
• ,
• π
• p
• ⁡
• (
• 1
• )
• ,
• …
• ⁢
• ,
• π
• p
• ⁡
• (
• N
• LDPC
• -
• K
• LDPC
• Q
• )
• 26 5 11 15 6 10 3 9 24 0 4 13 14 19 25 12 7 17 2 16 21 18 1 23 22 8 20.