Channel-encoding/decoding apparatus and method using low-density parity-check codes

An apparatus for encoding a Low-Density Parity-Check (LDPC) code comprising:

• an LDPC code parity-check matrix extracting part, for extracting basic column group information, serving as a set of information regarding positions of rows with weight 1, from a reference column in each column group of a predetermined parity-check matrix, generating column group information that transforms the positions of rows with weight 1 in the reference column of each column group in the extracted basic column group information into positions whose lengths are within a required parity length, and generating a parity-check matrix using the generated column group information;
• and
• an LDPC encoder for encoding data using the generated parity-check matrix.

An apparatus for decoding a Low-Density Parity-Check (LDPC) code comprising:

• an LDPC code parity-check matrix extracting part for extracting basic column group information, serving as a set of information regarding positions of rows with weight 1, from a reference column in each column group of a predetermined parity-check matrix, generating column group information that transforms the positions of rows with weight 1 in the reference column of each column group in the extracted basic column group information into positions whose lengths are within a required parity length, and generating a parity-check matrix using the generated column group information;
• and
• an LDPC decoder for decoding data using the generated parity-check matrix.