Interleaving and mapping method and deinterleaving and demapping method for LDPC codeword

A receiver, comprising:

• a deinterleaver dividing soft bits data into a first part and a second part and writing both parts into a storage space in order respectively and reading the two parts from the storage space in order, and then splicing the two parts to obtain soft bits data having undergone first bit deinterleaving;
• the deinterleaver dividing the soft bits data having undergone the first bit deinterleaving into multiple consecutive soft bits data subblocks in a predetermined length, and changing the order of the soft bits data subblocks according to a bit-deinterleaving pattern to form soft bits data having undergone second bit deinterleaving;
• the deinterleaver dividing a part of the soft bits data having undergone the second bit deinterleaving corresponding to a parity bits part in an LDPC codeword into first parity soft bits data and second parity soft bits data, and deinterleaving the first parity soft bits data and the second parity soft bits data respectively to obtain soft bits data having undergone third bit deinterleaving;
• and
• the deinterleaver splicing the information part in the soft bits data having undergone the second bit deinterleaving and the soft bits data having undergone the third bit deinterleaving into a soft bits data stream;
• a first part of the soft bits data is written into a storage space in a row order and read from the storage space in a column order, then a second part of the soft bits data is written into a storage space in a row order and read from the storage space in a column order;
• or a first part of the soft bits data is written into a storage space in a column order and read from the storage space in a row order, then a second part of the soft bits data is written into a storage space in a column order and read from the storage space in a row order:
• wherein for the LDPC codeword having a code rate pf 8/15 or 11/15 or 12/15, the second parity soft bits data includes 0 bits and no deinterleaving is performed on the second parity soft bits data.

A bit interleaving method, comprising:

• performing a first bit interleaving on parity bits in an LDPC codeword to obtain interleaved parity bits, wherein the parity bits contain a first parity bits part and a second parity bits part, and the first bit interleaving is performed on the first parity bits part and the second parity bits part respectively;
• splicing an information bit part in the LDPC codeword and the interleaved parity bits into an LDPC codeword having undergone the first bit interleaving;
• dividing the LDPC codeword having undergone the first bit interleaving into multiple consecutive bit subblocks in a predetermined length, and changing the order of the bit subblocks according to a corresponding bit interleaving pattern to form an LDPC codeword having undergone second bit interleaving;
• and
• dividing the LDPC codeword having undergone the second bit interleaving into two parts, writing a first part into a storage space in order and reading the first part from the storage space in order, then writing a second part into a storage space in order and reading the second part from the storage space in order, and splicing the two read results to obtain an LDPC codeword having undergone third bit interleaving;
• the first part is written into a storage space in a column order and read from the storage space in a row order, and then the second part is written into a storage space in a column order and read from the storage space in a row order;
• or the first part is written into a storage space in a row order and read from the storage space in a column order, and then the second part is written into a storage space in a row order and read from the storage space in a column order:
• wherein for the LDPC codeword having a code rate of 8/15 or 11/15 or 12/15, the second parity bits part includes 0 bits and no interleaving is performed on the second parity bits part.

A bit deinterleaving method, comprising:

• dividing soft bits data into a first part and a second part and writing both parts into a storage space in order respectively and reading the two parts from the storage space in order, and then splicing the two parts to obtain soft bits data having undergone first bit deinterleaving;
• dividing the soft bits data having undergone the first bit deinterleaving into multiple consecutive soft bits data subblocks in a predetermined length, and changing the order of the soft bits data subblocks according to a bit-deinterleaving pattern to form soft bits data having undergone second bit deinterleaving;
• dividing a part of the soft bits data having undergone the second bit deinterleaving corresponding to a parity bits part in an LDPC codeword into first parity soft bits data and second parity soft bits data, and deinterleaving the first parity soft bits data and the second parity soft bits data respectively to obtain soft bits data having undergone third bit deinterleaving;
• and
• splicing an information part in the soft bits data having undergone the second bit deinterleaving and the soft bits data having undergone the third bit deinterleaving into a soft bits data stream;
• a first part of the soft bits data is written into a storage space in a row order and read from the storage space in a column order, then a second part of the soft bits data is written into a storage space in a row order and read from the storage space in a column order;
• or a first part of the soft bits data is written into a storage space in a column order and read from the storage space in a row order, then a second part of the soft bits data is written into a storage space in a column order and read from the storage space in a row order:
• wherein for the LDPC codeword having a code rate of 8/15 or 11/15 or 12/15, the second parity soft bits data includes 0 bits and no deinterleaving is performed on the second parity soft bits data.