Patent application number | Description | Published |
20090070652 | APPARATUS AND METHOD FOR CHANNEL ENCODING/DECODING IN COMMUNICATION SYSTEM USING VARIABLE-LENGTH LDPC CODES - A method and apparatus for generating Low-Density Parity Check (LDPC) codes of various block lengths from a structured LDPC code in a communication system is provided. To support various block lengths, predefined rules are applied to a parity check matrix of an LDPC code, and then shortening is selectively applied to the parity check matrix. Subsequently, if information data bits are input, the input data information bits are encoded into an LDPC codeword by using the parity check matrix according to a preset encoding scheme, and then the encoded LDPC codeword is transmitted after puncturing is selectively applied. | 03-12-2009 |
20090125781 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING DATA IN A COMMUNICATION SYSTEM USING LOW DENSITY PARITY CHECK CODE - A method for transmitting data in a communication system using a Low Density Parity Check (LDPC) matrix includes generating an LDPC codeword by encoding information data bits, interleaving the LDPC codeword, mapping the interleaved LDPC codeword to a modulation signal, and generating a mapped signal by mapping the LDPC codeword bits separately to a bit corresponding to a real part and a bit corresponding to an imaginary part of said modulation signal, among bits constituting the modulation signal, generating a modulation signal by high-order-modulating the mapped signal and Radio Frequency (RF)-processing the modulation signal, and transmitting the RF-processed signal via a transmission antenna. | 05-14-2009 |
20090158129 | METHOD AND APPARATUS FOR ENCODING AND DECODING CHANNEL IN A COMMUNICATION SYSTEM USING LOW-DENSITY PARITY-CHECK CODES - A method for encoding a channel in a communication system using a Low-Density Parity-Check (LDPC) code. The method includes generating a plurality of column groups by grouping (categorizing) columns corresponding to an information word in a parity-check matrix of the LDPC code, and ordering the column groups; determining a range of an information word desired to be obtained by performing shortening; based on the determined range of the information word, performing column group-by-column group shortening on the column groups in order according to a predetermined shortening pattern; and LDPC encoding the shortened information word. | 06-18-2009 |
20090190039 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING PREAMBLES IN A DIGITAL VIDEO BROADCASTING SYSTEM - An apparatus and method for transmitting a preamble in a Digital Video Broadcasting (DVB) system are provided. The apparatus includes a first processor for generating a Modulation Signaling Sequence (MSS) using a plurality of received sequences, and for outputting a modulated sequence by differentially modulating the MSS. The apparatus also includes a scrambler for scrambling the modulated sequence by multiplying the modulated sequence by a scrambling sequence. A second processor receives the scrambled sequence through each allocated subcarrier, converts the received sequence into a time-domain signal, and generates and transmits the preamble. | 07-30-2009 |
20090190567 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING BROADCAST SERVICE DATA IN A BROADCASTING COMMUNICATION SYSTEM, METHOD FOR CONFIGURING THE BROADCAST SERVICE DATA, AND FRAME INCLUDING THE BROADCAST SERVICE DATA - An apparatus and method for configuring a broadcast service data in a digital broadcasting communication system are provided. The method includes mapping a first zone, corresponding to broadcast service data of a first type, and a second zone, corresponding to broadcast service data of a second type, in a frame individually. Preferably, the broadcast service data included in the first zone and the second zone is sliced into sub-slices according to a different number of service slicings for each zone. | 07-30-2009 |
20090204869 | METHOD AND APPARATUS FOR CHANNEL ENCODING AND DECODING IN A COMMUNICATION SYSTEM USING LOW-DENSITY PARITY-CHECK CODES - An apparatus and method for encoding a channel in a communication system using a Low-Density Parity-Check (LDPC) code. The method includes determining a number of parity bits to be subjected to puncturing; dividing the parity bits at predetermined intervals, and determining a number of puncturing bits, which are subjected to puncturing within the predetermined intervals; determining positions of puncturing parity bits corresponding to the determined number of puncturing bits; and repeatedly performing puncturing on the puncturing parity bits corresponding to the determined positions at the predetermined intervals. The predetermined intervals are determined by dividing a length of parity bits by a length of one column group in a parity-check matrix. | 08-13-2009 |
20090210767 | APPARATUS AND METHOD FOR ENCODING AND DECODING CHANNEL IN A COMMUNICATION SYSTEM USING LOW-DENSITY PARITY-CHECK CODES - An apparatus and method for generating a parity-check matrix of a Low-Density Parity-Check (LDPC) code are provided. Parameters for designing the LDPC code are determined, and a first parity-check matrix of a quasi-cyclic LDPC code is formed according to the determined parameters. A second parity-check matrix is created through the elimination of a predetermined portion of a parity part in the first parity-check matrix, and a third parity-check matrix is created by rearranging the second parity-check matrix. | 08-20-2009 |
20090213853 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING A FRAME INCLUDING CONTROL INFORMATION IN A BROADCASTING SYSTEM - Apparatus and method for transmitting and receiving a frame including control information in a broadcasting system. A frame for a broadcast service is generated using an in-band signaling scheme, and includes location information of control information in a next frame and indication information indicating a change/no-change in the control information in the next frame. The new frame structure minimizes power consumption of a receiver supporting the broadcast service. | 08-27-2009 |
20090217129 | METHOD AND APPARATUS FOR CHANNEL ENCODING AND DECODING IN A COMMUNICATION SYSTEM USING LOW-DENSITY-PARITY-CHECK CODES - A method and apparatus for encoding and decoding a channel in a communication system using a Low-Density Parity-Check (LDPC) code. The encoding method includes determining a modulation scheme for transmitting a symbol; determining a shortening pattern in consideration of the determined modulation scheme; grouping columns corresponding to an information word in a parity-check matrix of the LDPC code into a plurality of column groups; ordering the column groups; determining a range of a resulting information word desired to be obtained by shortening the information word; based on the range of the resulting information word, performing column group-by-column group shortening on the ordered column groups of the information word, according to the determined shortening pattern; and LDPC-encoding the shortened information word. | 08-27-2009 |
20090217130 | METHOD AND APPARATUS FOR CHANNEL ENCODING AND DECODING IN A COMMUNICATION SYSTEM USING LOW-DENSITY PARITY-CHECK CODES - A method for encoding a channel in a communication system using a Low-Density Parity-Check (LDPC) code is provided. The method includes determining a number of parity bits for puncturing; dividing the parity bits at predetermined intervals, and determining a number of puncturing parity bits, which are subjected to puncturing within the predetermined intervals; determining a modulation scheme; determining positions of puncturing parity bits corresponding to the determined number of the puncturing parity bits within the predetermined intervals according to the modulation scheme; repeatedly performing puncturing on puncturing parity bits corresponding to the determined positions at the predetermined intervals; and transmitting remaining bits except for the punctured bits according to the modulation scheme. | 08-27-2009 |
20090219884 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING CONTROL INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting/receiving control information in a wireless communication system are provided, in which physical layer signaling information to be transmitted in a frame is determined, a coded block is generated from signaling information having a fixed number of bits included in the physical layer signaling information, and a frame including the coded block is transmitted. The signaling information having the fixed number of bits includes information required for receiving other signaling information having a variable number of bits. | 09-03-2009 |
20090219918 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING IN-BAND SIGNALING INFORMATION IN A WIRELESS BROADCASTING SYSTEM - A method is provided for transmitting in-band signaling information in a wireless broadcasting system that transmits broadcast service data through a plurality of data Physical Layer Pipes (PLPs) constituting a frame. Non-PLP signaling information is included in a data PLP for a particular broadcast service and the data PLP is transmitted through a current frame, when no data PLP for the particular broadcast service is transmitted in at least one frame to be transmitted within a maximum schedulable period N | 09-03-2009 |
20090222706 | APPARATUS AND METHYOD FOR CHANNEL ENCODING AND DECODING IN COMMUNICATION SYSTEM USING LOW-DENISTY PARITY-CHECK CODES - An apparatus and a method for channel encoding/decoding in a communication system are provided. The apparatus and the method generate LDPC-encoded blocks with various lengths from an LDPC code with fixed length in a communication system using a Low-Density Parity-Check (LDPC) code. The apparatus and the method perform shortening using a predetermined number of shortened bits and perform LDPC encoding. The apparatus and the method apply predetermined rules according to the predetermined number of shortened bits and determine the number of bits to be punctured, and perform puncturing based on the determined number of punctured bits. | 09-03-2009 |
20090259913 | METHOD FOR ENCODING CONTROL INFORMATION IN A WIRELESS COMMUNICATION SYSTEM USING LOW DENSITY PARITY CHECK CODE, AND METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING THE CONTROL INFORMATION - A method and apparatus for transmitting control information in a wireless communication system using a Low Density Parity Check (LDPC) code is provided. The number of LDPC blocks, through which L1 post-signaling information is to be transmitted, is determined according to the total number of bits of the L1 post-signaling information. The number of input information bits of each LDPC block is calculated when the determined number of LDPC blocks is plural. The number of puncturing bits among parity bits of each LDPC block is determined considering a modulation order. A frame including one or multiple LDPC blocks generated through the preceding steps is transmitted. | 10-15-2009 |
20090268604 | APPARATUS AND METHOD FOR REDUCING PAPR OF PREAMBLE SIGNAL IN DIGITAL BROADCASTING SYSTEM - A method and apparatus for reducing a Peak to Average Power Ratio (PAPR) in a digital broadcasting system are provided. Reserved tones are determined, and the determined reserved tones are used to transmit a signal having an impulse characteristic in locations of sub-carriers that do not collide with a pilot signal of a preamble in a frame. The signal having the impulse characteristic is transmitted through the reserved tones in a symbol interval for which the preamble is transmitted. | 10-29-2009 |
20110107173 | APPARATUS AND METHOD FOR GENERATING A PARITY CHECK MATRIX IN A COMMUNICATION SYSTEM USING LINEAR BLOCK CODES, AND A TRANSMISSION/RECEPTION APPARATUS AND METHOD USING THE SAME - A method and apparatus are provided for generating a parity check matrix used to generate a linear block code in a communication system. The method includes determining a basic parameter of a second parity check matrix satisfying a rule predetermined with respect to a given first parity check matrix, generating a submatrix corresponding to a parity part of the second parity check matrix, using the basic parameter; and generating a submatrix corresponding to an information word part of the second parity check matrix, using the first parity check matrix and the basic parameter. | 05-05-2011 |
20110241911 | APPARATUS AND METHOD FOR CHANNEL ENCODING IN A COMMUNICATION/BROADCASTING SYSTEM - An encoding apparatus and method in a communication/broadcasting system are provided. When an encoding symbol is generated using at least one source symbol from among total source symbols to be encoded, encoding symbols are generated by using each of the total source symbols with a uniform probability before repeatedly using any of the total source symbols. | 10-06-2011 |
20110268176 | APPARATUS AND METHOD FOR ALLOCATING A DATA RATE IN A MULTI-ANTENNA TRANSMITTER - An apparatus and method for allocating a data rate in a multi-antenna system are provided, wherein a noise threshold corresponding to a modulation scheme, a coding rate, or a combination of both applied to a base layer from among a plurality of layers is set as a reference noise threshold, and a data rate is allocated to an enhanced layer among the plurality of layers, based on the reference noise threshold and a use or non-use of hierarchical transmission. | 11-03-2011 |
20110274202 | APPARATUS AND METHOD FOR CHANNEL CODING IN A COMMUNICATION SYSTEM - A method for channel coding by a transmitter in a communication system is provided. The method includes determining a degree of coded bits of a Luby-Transform (LT) code based on a coding rate of a pre-code and the number of coded bits of the LT code, selecting at least one associated bit used for coding of the coded bits of the LT code from among information bits of the LT code, depending on the determined degree, and generating the coded bits of the LT code by applying a coding function to the selected associated bits. | 11-10-2011 |
20110280351 | APPARATUS AND METHOD FOR COMPENSATING FOR PHASE NOISE IN A RECEIVER SUPPORTING OFDM - An apparatus and method for compensating for phase noise in a receiver supporting Orthogonal Frequency Division Multiplexing (OFDM) by receiving a frequency-domain recovered signal and a time-domain received signal, estimating an average phase noise for each of the partial blocks of the signals, calculating an overall average phase noise using the average phase noises of the partial blocks, and removing the phase noise from the time-domain received signal using the calculated total average phase noise. | 11-17-2011 |
20130013982 | METHOD FOR GENERATING FORWARD ERROR CORRECTION PACKET IN MULTIMEDIA SYSTEM AND METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING FORWARD ERROR CORRECTION PACKET - A method and apparatus for transmitting a Forward Error Correction (FEC) packet block including a plurality of FEC packets in a multimedia system are provided. The method includes generating a plurality of first FEC packet blocks by performing a first FEC encoding on a plurality of source symbols, each of the plurality of first FEC packet blocks including at least one source packet and at least one repair packet for repair of each of the at least one source packet, generating a second FEC packet block by performing a second FEC encoding on the plurality of first FEC packet blocks, the second FEC packet block including at least one repair packet for the plurality of first FEC packet blocks, and transmitting the second FEC packet block that includes, in header information of each of the at least one source packet and the at least one repair packet. | 01-10-2013 |
20140310579 | METHOD FOR GENERATING FORWARD ERROR CORRECTION PACKET IN MULTIMEDIA SYSTEM AND METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING FORWARD ERROR CORRECTION PACKET - A method and apparatus for transmitting a Forward Error Correction (FEC) packet block including a plurality of FEC packets in a multimedia system are provided. The method includes generating a plurality of first FEC packet blocks by performing a first FEC encoding on a plurality of source symbols, each of the plurality of first FEC packet blocks including at least one source packet and at least one repair packet for repair of each of the at least one source packet, generating a second FEC packet block by performing a second FEC encoding on the plurality of first FEC packet blocks, the second FEC packet block including at least one repair packet for the plurality of first FEC packet blocks, and transmitting the second FEC packet block that includes, in header information of each of the at least one source packet and the at least one repair packet. | 10-16-2014 |