Apparatus and method of encoding/decoding block low density parity check codes in a communication system

A method of encoding a block Low Density Parity Check (LDPC) code by a signal transmission apparatus in a communication system, the method comprising:

• generating, by the signal transmission apparatus, a block LDPC codeword by encoding an information vector using a second parity check matrix when a code rate to be used in the signal transmission apparatus is a second code rate less than a code rate of a first parity check matrix as a first code rate,
• wherein the second parity check matrix is generated using the first parity check matrix, the first parity check matrix includes a plurality of blocks, the plurality of blocks are classified into blocks corresponding to an information part corresponding to the information vector, blocks corresponding to a first parity part corresponding to a first parity vector, and blocks corresponding to a second parity part corresponding to a second parity vector,
• wherein the blocks classified as the information part are classified into blocks corresponding to a first partial block and blocks corresponding to a second partial block, the blocks classified as the first parity part are classified into blocks corresponding to a third partial block and blocks corresponding to a fourth partial block, and the blocks classified as the second parity part are classified into blocks corresponding to a fifth partial block and blocks corresponding to a sixth partial block,
• wherein the second parity check matrix includes the first parity check matrix and blocks corresponding to a third parity part corresponding to a third parity vector, the blocks classified as the third parity part are classified into blocks corresponding to a seventh partial block, blocks corresponding to an eighth partial block, blocks corresponding to a ninth partial block, blocks corresponding to a tenth partial block, blocks corresponding to an eleventh partial block and blocks corresponding to a twelfth partial block, and
• wherein the tenth partial block is diagonal with the sixth partial block block-by-block, identity matrixes are arranged in blocks corresponding to the tenth partial block.

A method of encoding a block Low Density Parity Check (LDPC) code by a signal transmission apparatus in a communication system, the method comprising:

• generating by the signal transmission apparatus, a first parity vector, a second parity vector, and a third parity vector by encoding an information vector using a second parity check matrix when a code rate to be used in the signal transmission apparatus is a second code rate greater than a code rate of a first parity check matrix as a first code rate, wherein a code rate of the second parity check matrix is a third code rate less than the first code rate;
• and
• generating a block LDPC codeword by puncturing at least one of the information vector, the first parity vector, the second parity vector, and the third parity vector, corresponding to the second code rate,
• wherein the second parity check matrix is generated using the first parity check matrix, the first parity check matrix includes a plurality of blocks, the plurality of blocks are classified into blocks corresponding to an information part corresponding to the information vector, blocks corresponding to a first parity part corresponding to the first parity vector, and blocks corresponding to a second parity part corresponding to the second parity vector,
• wherein the blocks classified as the information part are classified into blocks corresponding to a first partial block and blocks corresponding to a second partial block, the blocks classified as the first parity part are classified into blocks corresponding to a third partial block and blocks corresponding to a fourth partial block, and the blocks classified as the second parity part are classified into blocks corresponding to a fifth partial block and blocks corresponding to a sixth partial block,
• wherein the second parity check matrix includes the first parity check matrix and blocks corresponding to a third parity part corresponding to the third parity vector, the blocks classified as the third parity part are classified into blocks corresponding to a seventh partial block, blocks corresponding to an eighth partial block, blocks corresponding to a ninth partial block, blocks corresponding to a tenth partial block, blocks corresponding to an eleventh partial block and blocks corresponding to a twelfth partial block, and
• wherein the tenth partial block is diagonal with the sixth partial block block-by-block, identity matrixes are arranged in blocks corresponding to the tenth partial block.

A signal transmission apparatus for encoding a block Low Density Parity Check (LDPC) code in a communication system, the signal transmission apparatus comprising:

• an encoder for generating a block LDPC codeword by encoding an information vector using a second parity check matrix when a code rate to be used in the signal transmission apparatus is a second code rate less than a code rate of a first parity check matrix as a first code rate,
• wherein the second parity check matrix is generated using the first parity check matrix, the first parity check matrix includes a plurality of blocks, the plurality of blocks are classified into blocks corresponding to an information part corresponding to the information vector, blocks corresponding to a first parity part corresponding to a first parity vector, and blocks corresponding to a second parity part corresponding to a second parity vector,
• wherein the blocks classified as the information part are classified into blocks corresponding to a first partial block and blocks corresponding to a second partial block, the blocks classified as the first parity part are classified into blocks corresponding to a third partial block and blocks corresponding to a fourth partial block, and the blocks classified as the second parity part are classified into blocks corresponding to a fifth partial block and blocks corresponding to a sixth partial block,
• wherein the second parity check matrix includes the first parity check matrix and blocks corresponding to a third parity part corresponding to a third parity vector, the blocks classified as the third parity part are classified into blocks corresponding to a seventh partial block, blocks corresponding to an eighth partial block, blocks corresponding to a ninth partial block, blocks corresponding to a tenth partial block, blocks corresponding to an eleventh partial block and blocks corresponding to a twelfth partial block, and
• wherein the tenth partial block is diagonal with the sixth partial block block-by-block, identity matrixes are arranged in blocks corresponding to the tenth partial block.

A signal transmission apparatus for encoding a block Low Density Parity Check (LDPC) code in a communication system, the signal transmission apparatus comprising:

• an encoder for generating a first parity vector, a second parity vector, and a third parity vector by encoding an information vector using a second parity check matrix when a code rate to be used in the signal transmission apparatus is a second code rate greater than a code rate of a first parity check matrix as a first code rate, wherein a code rate of the second parity check matrix is a third code rate less than the first code rate, and generating a block LDPC codeword by puncturing at least one of the information vector, the first parity vector, the second parity vector, and the third parity vector, corresponding to the second code rate,
• wherein the second parity check matrix is generated using the first parity check matrix, the first parity check matrix includes a plurality of blocks, the plurality of blocks are classified into blocks corresponding to an information part corresponding to the information vector, blocks corresponding to a first parity part corresponding to a first parity vector, and blocks corresponding to a second parity part corresponding to a second parity vector,
• wherein the blocks classified as the information part are classified into blocks corresponding to a first partial block and blocks corresponding to a second partial block, the blocks classified as the first parity part are classified into blocks corresponding to a third partial block and blocks corresponding to a fourth partial block, and the blocks classified as the second parity part are classified into blocks corresponding to a fifth partial block and blocks corresponding to a sixth partial block,
• wherein the second parity check matrix includes the first parity check matrix and blocks corresponding to a third parity part corresponding to a third parity vector, the blocks classified as the third parity part are classified into blocks corresponding to a seventh partial block, blocks corresponding to an eighth partial block, blocks corresponding to a ninth partial block, blocks corresponding to a tenth partial block, blocks corresponding to an eleventh partial block and blocks corresponding to a twelfth partial block, and
• wherein the tenth partial block is diagonal with the sixth partial block block-by-block, identity matrixes are arranged in blocks corresponding to the tenth partial block.

A method of decoding a block low density parity check (LDPC) code by a signal reception apparatus in a communication system, the method comprising:

• detecting, by the signal reception apparatus, an information vector by decoding a reception signal using a second parity check matrix when a code rate used in the signal transmission apparatus is a second code rate less than a code rate of a first parity check matrix as a first code rate,
• wherein the second parity check matrix is generated using a first parity check matrix, the first parity check matrix includes a plurality of blocks, the plurality of blocks are classified into blocks corresponding to an information part corresponding to the information vector, blocks corresponding to a first parity part corresponding to a first parity vector, and blocks corresponding to a second parity part corresponding to a second parity vector,
• wherein the blocks classified as the information part are classified into blocks corresponding to a first partial block and blocks corresponding to a second partial block, the blocks classified as the first parity part are classified into blocks corresponding to a third partial block and blocks corresponding to a fourth partial block, and the blocks classified as the second parity part are classified into blocks corresponding to a fifth partial block and blocks corresponding to a sixth partial block,
• wherein the second parity check matrix includes the first parity check matrix and blocks corresponding to a third parity part corresponding to a third parity vector, the blocks classified as the third parity part are classified into blocks corresponding to a seventh partial block, blocks corresponding to an eighth partial block, blocks corresponding to a ninth partial block, blocks corresponding to a tenth partial block, blocks corresponding to an eleventh partial block and blocks corresponding to a twelfth partial block, and
• wherein the tenth partial block is diagonal with the sixth partial block block-by-block, identity matrixes are arranged in blocks corresponding to the tenth partial block.

A method of decoding a block low density parity check (LDPC) code by a signal reception apparatus in a communication system, the method comprising:

• generating, by the signal reception apparatus, a decoded signal by inserting zero into a predetermined position of a reception signal when a code rate used in the signal transmission apparatus is a second code rate greater than a code rate of a first parity check matrix as a first code rate, wherein a code rate of decoded signal is a third code rate less than the first code rate;
• and
• detecting an information vector by decoding the decoded signal using a second parity check matrix having the third code rate,
• wherein the second parity check matrix is generated using the first parity check matrix, the first parity check matrix includes a plurality of blocks, the plurality of blocks are classified into blocks corresponding to an information part corresponding to the information vector, blocks corresponding to a first parity part corresponding to a first parity vector, and blocks corresponding to a second parity part corresponding to a second parity vector,
• wherein the blocks classified as the information part are classified into blocks corresponding to a first partial block and blocks corresponding to a second partial block, the blocks classified as the first parity part are classified into blocks corresponding to a third partial block and blocks corresponding to a fourth partial block, and the blocks classified as the second parity part are classified into blocks corresponding to a fifth partial block and blocks corresponding to a sixth partial block,
• wherein the second parity check matrix includes the first parity check matrix and blocks corresponding to a third parity part corresponding to a third parity vector, the blocks classified as the third parity part are classified into blocks corresponding to a seventh partial block, blocks corresponding to an eighth partial block, blocks corresponding to a ninth partial block, blocks corresponding to a tenth partial block, blocks corresponding to an eleventh partial block and blocks corresponding to a twelfth partial block, and
• wherein the tenth partial block is diagonal with the sixth partial block block-by-block, identity matrixes are arranged in blocks corresponding to the tenth partial block.

A signal reception apparatus for decoding a block Low Density Parity Check (LDPC) code in a communication system, the apparatus comprising:

• a decoder for detecting an information vector by decoding a reception signal using a second parity check matrix when a code rate used in the signal transmission apparatus is a second code rate less than a code rate of a first parity check matrix as a first code rate,
• wherein the second parity check matrix is generated using the first parity check matrix, the first parity check matrix includes a plurality of blocks, the plurality of blocks are classified into blocks corresponding to an information part corresponding to the information vector, blocks corresponding to a first parity part corresponding to a first parity vector, and blocks corresponding to a second parity part corresponding to a second parity vector,
• wherein the blocks classified as the information part are classified into blocks corresponding to a first partial block and blocks corresponding to a second partial block, the blocks classified as the first parity part are classified into blocks corresponding to a third partial block and blocks corresponding to a fourth partial block, and the blocks classified as the second parity part are classified into blocks corresponding to a fifth partial block and blocks corresponding to a sixth partial block,
• wherein the second parity check matrix includes the first parity check matrix and blocks corresponding to a third parity part corresponding to a third parity vector, the blocks classified as the third parity part are classified into blocks corresponding to a seventh partial block, blocks corresponding to an eighth partial block, blocks corresponding to a ninth partial block, blocks corresponding to a tenth partial block, blocks corresponding to an eleventh partial block and blocks corresponding to a twelfth partial block, and
• wherein the tenth partial block is diagonal with the sixth partial block block-by-block, identity matrixes are arranged in blocks corresponding to the tenth partial block.

A signal reception apparatus for decoding a block Low Density Parity Check (LDPC) code in a communication system, the apparatus comprising:

• a decoder for generating a decoded signal by inserting zero into a predetermined position of a reception signal when a code rate used in the signal transmission apparatus is a second code rate greater than a code rate of a first parity check matrix as a first code rate, wherein a code rate of decoded signal is a third code rate less than the first code rate, and detecting an information vector by decoding the decoded signal using a second parity check matrix having the third code rate,
• wherein the second parity check matrix is generated using the first parity check matrix, the first parity check matrix includes a plurality of blocks, the plurality of blocks are classified into blocks corresponding to an information part corresponding to the information vector, blocks corresponding to a first parity part corresponding to a first parity vector, and blocks corresponding to a second parity part corresponding to a second parity vector,
• wherein the blocks classified as the information part are classified into blocks corresponding to a first partial block and blocks corresponding to a second partial block, the blocks classified as the first parity part are classified into blocks corresponding to a third partial block and blocks corresponding to a fourth partial block, and the blocks classified as the second parity part are classified into blocks corresponding to a fifth partial block and blocks corresponding to a sixth partial block,
• wherein the second parity check matrix includes the first parity check matrix and blocks corresponding to a third parity part corresponding to a third parity vector, the blocks classified as the third parity part are classified into blocks corresponding to a seventh partial block, blocks corresponding to an eighth partial block, blocks corresponding to a ninth partial block, blocks corresponding to a tenth partial block, blocks corresponding to an eleventh partial block and blocks corresponding to a twelfth partial block, and
• wherein the tenth partial block is diagonal with the sixth partial block block-by-block, identity matrixes are arranged in blocks corresponding to the tenth partial block.