Patent application number | Description | Published |
20080246639 | Decoding Apparatus and Communications Apparatus - A decoding apparatus includes a row processing unit | 10-09-2008 |
20090031186 | Error correction coding apparatus - An error correction coding apparatus is disposed to generate a low-density parity-check code | 01-29-2009 |
20090063930 | CHECK MATRIX GENERATING METHOD, ENCODING METHOD, DECODING METHOD, COMMUNICATION DEVICE, ENCODER, AND DECODER - A regular quasi-cyclic matrix is generated with cyclic permutation matrices and specific regularity given to the cyclic permutation matrices. A mask matrix for making the regular quasi-cyclic matrix into an irregular quasi-cyclic matrix is generated. An irregular masked quasi-cyclic matrix is generated by converting a specific cyclic permutation matrix in the regular quasi-cyclic matrix into a zero-matrix using a mask matrix supporting a specific encoding rate. An irregular parity check matrix with an LDGM structure is generated with a masked quasi-cyclic matrix and a matrix in which the cyclic permutation matrices are arranged in a staircase manner. | 03-05-2009 |
20090132887 | Communication Apparatus and Decoding Method - A communication apparatus includes a storage unit, a row processing unit, and a column processing unit. The row processing unit repeatedly performs row processing to calculate a column-processing LLR for each column and each row in a check matrix. The column processing unit calculates a row-processing LLR for each column and each row of the check matrix, and repeatedly performs column processing to store in the storage unit the minimum value k of absolute values of the row-processing LLR. The row processing unit and the column processing unit alternately performs their processing. The row processing unit performs calculation using an approximate minimum value while the column processing unit cyclically updates the minimum k value of each row. | 05-21-2009 |
20090164864 | INSPECTION MATRIX GENERATION METHOD, ENCODING METHOD, COMMUNICATION DEVICE, COMMUNICATION SYSTEM, AND ENCODER - A regular qc matrix is generated in which cyclic permutation matrices with specific regularity are arranged in row and column directions. A mask matrix supporting multiple encoding rates is generated for making the regular qc matrix into irregular. A specific cyclic permutation matrix in the regular qc matrix is converted into a zero-matrix using a mask matrix corresponding to a specific encoding rate to generate an irregular masking qc matrix. An irregular parity check matrix with a LDGM structure is generated, in which the masking qc matrix and a matrix in which the cyclic permutation matrices are arranged in a staircase manner are arranged in a predetermined location. | 06-25-2009 |
20090265600 | TEST MATRIX GENERATING METHOD, ENCODING METHOD, DECODING METHOD, COMMUNICATION APPARATUS, COMMUNICATION SYSTEM, ENCODER AND DECODER - A regular quasi-cyclic matrix is prepared, a conditional expression for assuring a predetermined minimum loop in a parity check matrix is derived, and a mask matrix for converting a specific cyclic permutation matrix into a zero-matrix based on the conditional expression and a predetermined weight distribution is generated. The specific cyclic permutation matrix is converted into the zero-matrix to generate an irregular masking quasi-cyclic matrix. An irregular parity check matrix in which the masking quasi-cyclic matrix and a matrix in which the cyclic permutation matrices are arranged in a staircase manner are arranged in a predetermined location. | 10-22-2009 |
20100058140 | CHECK-MATRIX GENERATING METHOD, ENCODING METHOD, COMMUNICATION APPARATUS, COMMUNICATION SYSTEM, AND ENCODER - A regular quasi-cyclic matrix is generated in which specific regularity is given to cyclic permutation matrices. A mask matrix capable of supporting a plurality of encoding rates is generated. A specific cyclic permutation matrix in the regular quasi-cyclic matrix is converted into a zero-matrix using a mask matrix corresponding to a specific encoding rate to generate an irregular masking quasi-cyclic matrix. An irregular parity check matrix with an LDGM structure is generated in which the masking quasi-cyclic matrix and a matrix in which the cyclic permutation matrices are arranged in a staircase manner are arranged in a predetermined location. | 03-04-2010 |
20100211846 | CHECK MATRIX GENERATING DEVICE, CHECK MATRIX GENERATING METHOD, ENCODER, TRANSMITTER, DECODER, AND RECEIVER - When arranging J cyclic permutation matrices I(p | 08-19-2010 |