Patent application number | Description | Published |
20080256425 | Method of Encoding and Decoding Adaptive to Variable Code Rate Using Ldpc Code - A variable code rate adaptive encoding/decoding method using LDDC code is disclosed, in which an input source data is encoded using the LDPC (low density parity check) code defined by a first parity check matrix configured with a plurality of submatrices. The present invention includes the steps of generating a second parity check matrix corresponding to a code rate by reducing a portion of a plurality of submatrices configuring a first parity check matrix according to the code rate to be applied to encoding an input source data and encoding the input source data using the second parity check matrix. | 10-16-2008 |
20080270867 | Method of Encoding and Decoding Using Ldpc Code and Apparatus Thereof - A method of encoding/decoding using an LDPC code and apparatus thereof are disclosed, by which a memory for storing a parity check matrix can be saved. The present invention includes generating a parity check matrix by expanding a base matrix including a permutation type defining a permutation matrix as at least one element, wherein the permutation matrix is generated from permutating a sequence of at least one of rows and columns of at least one base permutation matrix or rotating the at least one base permutation matrix and encoding or decoding the input data using the parity check matrix. | 10-30-2008 |
20080270877 | Method of Encoding and Decoding Using Low Density Parity Check Code - A method of encoding and decoding using an LDPC code is disclosed, by which a memory for storing a parity check matrix necessary for the encoding or decoding using the LDPC code and calculation amount and complexity necessary for the encoding or decoding can be reduced. The present invention includes a step of encoding an input data using a parity check matrix H having a configuration of H=[H | 10-30-2008 |
20090063926 | APPARATUS AND METHOD FOR DECODING USING CHANNEL CODE - An apparatus and method for decoding a channel code is disclosed. The method for decoding a channel code includes the steps of receiving a low density parity check (LDPC) encoded signal from a transmitting party, generating a parity check matrix by adjusting the order of rows or columns of the parity check matrix, the parity check matrix including a plurality of groups consisting of a plurality of columns, at least one of the groups including at least one row of which every element is zero (0), and iteratively decoding the received signal for each group by using the generated parity check matrix. | 03-05-2009 |
20090132886 | Method of Encoding and Decoding Using LDPC Code - A method of encoding/decoding using an LDPC code is disclosed, by which performance is enhanced and by which complexity is reduced. In encoding/decoding using an LDPC code defined by an (n−k) | 05-21-2009 |
20090164863 | METHOD OF ENCODING AND DECODING USING LOW DENSITY PARITY CHECK MATRIX - A method of encoding and decoding using an LDPC code is disclosed, by which encoding and decoding performance can be enhanced and which can be effectively applied to a communication system employing a variable data rate. In encoding or decoding an input data using a parity check matrix H, the present invention is characterized in that the parity check matrix H has a configuration of H=[H | 06-25-2009 |
20090175376 | DATA COMMUNICATION IN A WIRELESS COMMUNICATION SYSTEM USING SPACE-TIME CODING - A method of controlling data communication in a wireless communication system comprises measuring channel quality from data received from a base station having multiple antennas, wherein the base station and a mobile station are in a closed loop space-time coding (STC) communication. The method also comprises determining a first weight matrix based on a number of the multiple antennas of the base station, the weight matrix comprising weight elements. The method also comprises determining a second weight matrix from the first weight matrix in response to a predetermined condition, wherein the second weight matrix is associated with controlling data output using the multiple antennas of the base station for subsequent transmission. The method also comprises providing a number of STC outputs to the base station, wherein the number of STC outputs is associated with the second weight matrix. | 07-09-2009 |
20090199067 | METHOD AND APPARATUS OF ENCODING AND DECODING DATA USING LOW DENSITY PARITY CHECK CODE IN A WIRELESS COMMUNICATION SYSTEM - A method of encoding data using low density parity check (LDPC) code defined by a m×n parity check matrix is disclosed. More specifically, the method includes encoding input source data using the parity check matrix, wherein the parity check matrix comprises a plurality of z×z sub-matrices of which row weights and column weights are ‘0’ or ‘1’. | 08-06-2009 |
20090199068 | METHOD AND APPARATUS OF ENCODING AND DECODING DATA USING LOW DENSITY PARITY CHECK CODE IN A WIRELESS COMMUNICATION SYSTEM - A method of encoding data using low density parity check (LDPC) code defined by a m×n parity check matrix is disclosed. More specifically, the method includes encoding input source data using the parity check matrix, wherein the parity check matrix comprises a plurality of z×z sub-matrices of which row weights and column weights are ‘0’ or ‘1’. | 08-06-2009 |
20090298510 | METHOD OF PERFORMING SCHEDULING IN A WIRED OR WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - A method of performing scheduling and a method of controlling call admission in a communication system are disclosed. A method of controlling call admission a new user equipment which enters a network in a communication system includes performing scheduling by giving priority lower than that of a user equipment which is previously receiving a service to the new user equipment, and determining whether to admit call of the new user equipment depending a result of scheduling for a certain time period. | 12-03-2009 |
20090307562 | METHOD OF MATCHING CODEWORD SIZE AND TRANSMITTER THEREFOR IN MOBILE COMMUNICATIONS SYSTEM - The present invention relates to a method and a transmitter for matching a size of codeword encoded by low density parity check (LDPC) code to a size of a transmission channel and in a mobile communication system. A method of adjusting a codeword size in a communication system supporting an LDPC coding scheme, comprises steps of encoding source data by using a parity check matrix, and adjusting a size of the encoded codeword to be matched to a size of a transmission channel which is determined in accordance with a capacity of the transmission channel, the size of the encoded codeword being adjusted using information associated with column weights of the parity check matrix. | 12-10-2009 |
20120185746 | METHOD AND APPARATUS OF ENCODING AND DECODING DATA USING LOW DENSITY PARITY CHECK CODE IN A WIRELESS COMMUNICATION SYSTEM - A method of encoding data using low density parity check (LDPC) code defined by a m×n parity check matrix is disclosed. More specifically, the method includes encoding input source data using the parity check matrix, wherein the parity check matrix comprises a plurality of z×z sub-matrices of which row weights and column weights are ‘0’ or ‘1’. | 07-19-2012 |