Method and apparatus for signal transmission/reception in a communication system using an HARQ scheme

An apparatus for transmitting a signal in a communication system using a Hybrid Automatic Repeat reQuest (HARQ) scheme, the apparatus comprising:

• an encoder for generating a codeword vector by encoding an information vector by using a first parity check matrix of Low Density Parity Check (LDPC) codes;
• and
• a transmitter for generating a transmission vector by processing the codeword vector, and for transmitting the transmission vector,
• wherein, when the first parity check matrix comprises a plurality of square matrix columns, each square matrix has a size of L×L, the first parity check matrix is one of p parity check matrixes stored in the signal transmission apparatus, the p parity check matrixes support different numbers of information vector square matrix columns, and each of the numbers of information vector square matrix columns indicates the number of square matrix columns corresponding to the information vector from among the plurality of square matrix columns, and
• wherein the first parity check matrix is a parity check matrix supporting the number of information vector square matrix columns determined by using the length of the information vector and the value L from the p parity check matrixes, and the value L is determined by using p and the length of the information vector.

A method of receiving a signal in a communication system using a Hybrid Automatic Repeat reQuest (HARQ) scheme, the method comprising:

• generating a reception vector by processing a received signal;
• and
• restoring an information vector by decoding the reception vector by using a first parity check matrix of Low Density Parity Check (LDPC) codes,
• wherein, when the first parity check matrix comprises a plurality of square matrix columns, each square matrix has a size of L×L, the first parity check matrix is one of p parity check matrixes stored in a signal transmission apparatus corresponding to the signal reception apparatus, the p parity check matrixes support different numbers of information vector square matrix columns, and each of the numbers of information vector square matrix columns indicates the number of square matrix columns corresponding to the information vector from among the plurality of square matrix columns, and
• wherein the first parity check matrix is a parity check matrix supporting the number of information vector square matrix columns determined by using the length of the information vector and the value L from the p parity check matrixes, and the value L is determined by using p and the length of the information vector.

An apparatus for receiving a signal in a communication system using a Hybrid Automatic Repeat reQuest (HARQ) scheme, the apparatus comprising:

• a receiver for generating a reception vector by processing a received signal;
• and
• a decoder for restoring an information vector by decoding the reception vector by using a first parity check matrix of Low Density Parity Check (LDPC) codes,
• wherein, when the first parity check matrix comprises a plurality of square matrix columns, each square matrix has a size of L×L, the first parity check matrix is one of p parity check matrixes stored in a signal transmission apparatus corresponding to the signal reception apparatus, the p parity check matrixes support different numbers of information vector square matrix columns, and each of the numbers of information vector square matrix columns indicates the number of square matrix columns corresponding to the information vector from among the plurality of square matrix columns, and
• wherein the first parity check matrix is a parity check matrix supporting the number of information vector square matrix columns determined by using the length of the information vector and the value L from the p parity check matrixes, and the value L is determined by using p and the length of the information vector.