Apparatus and method for coding/decoding block low density parity check code in a mobile communication system

A method for decoding a block low density parity check (LDPC) code by a decoding apparatus, the method comprising:

• decoding a block LDPC code based on a parity check matrix, the parity check matrix including an information part and a parity part, the parity part comprising:
• a first section (B) including a first permutation matrix and an identity matrix,
• a second section (D) including a second permutation matrix, and
• a third section (T) including identity matrices arranged diagonally within the third section and identity matrices arranged below the identity matrices which are arranged diagonally within the third section.

A system for processing a block low density parity check (LDPC) code, the system comprising:

• an encoding apparatus configured to encode a block LDPC code based on a parity check matrix, the parity check matrix including an information part and a parity part, the parity part comprising:
• a first section (B) including a first permutation matrix and an identity matrix,
• a second section (D) including a second permutation matrix, and
• a third section (T) including identity matrices arranged diagonally within the third section and identity matrices arranged below the identity matrices which are arranged diagonally within the third section.

A method for encoding a block low density parity check (LDPC) code by an encoding apparatus, the method comprising:

• encoding a block LDPC code based on a parity check matrix, the parity check matrix including an information part and a parity part, the parity part comprising:
• a first section (B) including a first permutation matrix and an identity matrix,
• a second section (D) including a second permutation matrix, and
• a third section (T) including identity matrices arranged diagonally within the third section and identity matrices arranged below the identity matrices which are arranged diagonally within the third section.