| Patent application number | Description | Published |
|---|
| 20080219375 | APPARATUS AND METHOD FOR SPATIAL MULTIPLEXING WITH BACKWARD COMPATIBILITY IN A MULTIPLE INPUT MULTIPLE OUTPUT WIRELESS COMMUNICATION SYSTEM - An apparatus and method for supporting both a receiver using a single antenna and a receiver using multiple antennas in a Multiple Input Multiple Output (MIMO) wireless communication system are provided. The apparatus and method in a MIMO wireless communication system include a first synthesizer for generating a first Transmit (Tx) signal by adding a first signal and a second signal, a second synthesizer for generating a second Tx signal by subtracting the second signal from the first signal and a plurality of transmitting units for transmitting the first Tx signal and the second Tx signal through corresponding antennas. Accordingly, receivers having either a single antenna or multiple antennas may be employed in the same communication system. | 09-11-2008 |
| 20080225983 | APPARATUS AND METHOD FOR SELECTING A MULTI-ANTENNA TRANSMISSION METHOD IN A BROADCASTING SYSTEM - An apparatus and a method for transmitting broadcasting signals in a broadcasting system having multi-antenna are provided. The apparatus comprises at least one antenna, a signal generator for generating two or more broadcasting signals to be transmitted, at least two of the two or more broadcasting signals being generated according to different user-required quality characteristics, a multi-antenna modulator for modulating each of the broadcasting signals according to one of a plurality of multi-antenna transmission methods selected for each of the broadcasting signals according to the user-required quality characteristics of the respective broadcasting signals, and a transmitter for transmitting the modulated signals via the at least one antenna. | 09-18-2008 |
| 20090010350 | APPARATUS AND METHOD FOR DETECTING SIGNAL USING MULTIVARIATE POLYNOMIAL IN MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM - A signal detection apparatus and method in a Multiple Input Multiple Output (MIMO) wireless communication system are provided. The apparatus includes a receiver for receiving training symbol vectors and a data signal vector from a transmitting end through a plurality of receive (Rx) antennas and a detector for expanding the training symbol vectors into second- or higher-order polynomials, for generating a weighting parameter vector for multivariate polynomial expansion of the data signal vector by using the polynomials expanded from the training symbol vectors and thereafter for expanding the data signal vector into a second- or higher-order multivariate polynomial using the weighting parameter vector, and for detecting Transmit (Tx) values of the data signal vector from the multivariate polynomial. Therefore, signal detection performance in a Multiple Input Multiple Output (MIMO) wireless communication system resembles that of a non-linear scheme while complexity resembles that of a linear scheme. | 01-08-2009 |
| 20090063929 | Apparatus and method for transmitting and receiving data in a communication system using low density parity check codes - An apparatus for transmitting data in a communication system using a Low Density Parity Check (LDPC) matrix is provided. The apparatus includes an interleaver for interleaving a descending bit-ordered codeword having a predetermined size and in accordance with a predetermined modulation scheme; and a bit mapper for mapping codeword bits constituting the interleaved codeword in accordance with a predetermined mapping scheme that takes into account degrees of the codeword bits and reliability characteristics of modulation symbol-constituting bits based on the predetermined modulation scheme. | 03-05-2009 |
| 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 |
| 20090116512 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING CONTROL INFORMATION IN BROADCAST COMMUNICATION SYSTEM - Disclosed is a method and apparatus for transmitting/receiving control information in a system in which one or more Radio Frequencies (RFs) are used to carry multiple services through a frame constituted by time resources or time-frequency resources. Control information regarding frame configuration information is not transmitted over a separate control channel but over a data channel through which to transmit primary service traffic among all service traffic, and each non-primary service traffic other than the primary service traffic includes control information for a primary service. Thus, even when a receiver changes the current service to a target service, control information necessary to detect the location of the target service in a frame and demodulate the target service can be acquired, and thus a service change can be made without reading a separate control channel. | 05-07-2009 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 20110026447 | METHOD AND SYSTEM FOR TRANSMITTING AND RECEIVING CONTROL INFORMATION IN BROADCASTING COMMUNICATION SYSTEM - Disclosed is a method and an apparatus for transmitting and receiving control information for receiving a service in a broadcast communication system. The method includes: inserting first control information for receiving at least one different service at a next frame in each of multiple service data pieces of a current frame; and transmitting a frame including the first control information through a wireless network. By the method, it is possible to efficiently transmit and receive a frame, which includes multiple services configured through a combination of one or more RFs, thereby enabling rapid receiving of a switched service in the case of service switching. | 02-03-2011 |
| 20110119568 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA IN A COMMUNICATION SYSTEM - A method is provided for transmitting data, which improves a diversity effect in a communication system. The method includes transmitting an information word including a codeword in a (k+s)-th frame, generating s groups based on parity bits obtained by encoding the information word, and transmitting the s groups in s frames preceding the (k+s)-th frame, in a distributed manner. | 05-19-2011 |
