Transmission method, transmitter, reception method, and receiver

A reception method for receiving a codeword generated based on a quasi-cyclic low-density parity-check coding scheme including a repeat-accumulate quasi-cyclic low-density parity-check coding scheme, the codeword consisting of N bit groups, the bit groups each consisting of Q bits, the codeword undergoing predetermined processing and then being transmitted by a transmitter, the predetermined processing including:

• generating a plurality of constellation blocks from the codeword, each of the plurality of constellation blocks being generated from G×M bits;
• and
• permuting the constellation blocks,
• wherein each of the bit groups is allocated to one of N/M sections, each section consisting of M different bit groups,
• each of the constellation blocks consists of G bits from each of the M different bit groups, and
• the permuting of the constellation blocks is equivalent to writing the constellation blocks row by row into a matrix with R rows and (Q/(k×G)) columns and reading out the constellation blocks column by column from the matrix, where R is k×(N/M), and k, N, Q, G, M, and R are positive integers,
• the reception method comprising the steps of:
• receiving, using a reception unit, a plurality of constellation blocks that have undergone a constellation block permutation on a transmission side, the constellation blocks each consisting of G×M bits;
• applying, using a constellation block deinterleaver, an inverse constellation block permutation to the received constellation blocks;
• and
• transforming, using a transformer, the constellation blocks, which have undergone the inverse constellation block permutation, into bits of a codeword;
• wherein the inverse constellation block permutation is restoration of an order of the constellation blocks that have been permuted in the constellation block permutation.

A transmitter for transmitting a codeword generated based on a quasi-cyclic low-density parity-check coding scheme including a repeat-accumulate quasi-cyclic low-density parity-check coding scheme, the codeword consisting of N bit groups, the bit groups each consisting of Q bits, the transmitter comprising:

• a generator generating a plurality of constellation blocks from the codeword, each of the plurality of constellation blocks being generated from G×M bits;
• a constellation block interleaver applying a constellation block permutation to the constellation blocks;
• and
• a transmission unit transmitting the permuted constellation blocks,
• wherein each of the bit groups is allocated to one of N/M sections, each section consisting of M bit groups,
• each of the constellation blocks consists of G bits from each of the M different bit groups, and
• the constellation block permutation is equivalent to writing the constellation blocks row by row into a matrix with R rows and (Q/(k×G)) columns and reading out the constellation blocks column by column from the matrix, where R is k×(N/M), and k, N, Q, G, M, and R are positive integers.

A receiver for receiving a codeword generated based on a quasi-cyclic low-density parity-check coding scheme including a repeat-accumulate quasi-cyclic low-density parity-check coding scheme, the codeword consisting of N bit groups, the bit groups each consisting of Q bits, the codeword undergoing predetermined processing and then being transmitted by a transmitter, the predetermined processing including:

• generating a plurality of constellation blocks from the codeword, each of the plurality of constellation blocks being generated from G×M bits;
• and
• permuting the constellation blocks,
• wherein the codeword is divided into N/M sections each consisting of M quasi-cyclic blocks,
• each of the constellation blocks consists of G bits from each of the M different bit groups, and
• the permuting of the constellation blocks is equivalent to writing the constellation blocks row by row into a matrix with R rows and (Q/(k×G)) columns and reading out the constellation blocks column by column from the matrix, where R is k×(N/M), and k, N, Q, G, M, and R are positive integers,
• the receiver comprising:
• a reception unit receiving a plurality of constellation blocks that have undergone a constellation block permutation on a transmission side, the constellation blocks each consisting of G×M bits;
• a constellation block deinterleaver applying an inverse constellation block permutation to the received constellation blocks;
• and
• a transformer transforming the constellation blocks, which have undergone the inverse constellation block permutation, into bits of a codeword;
• wherein,
• the inverse constellation block permutation is restoration of an order of the constellation blocks that have been permuted in the constellation block permutation.