Patent application number | Description | Published |
20080298228 | Transmitting/Receiving Apparatus of Wideband Wireless Channel Apparatus Using Multiple Carriers - The present invention relates to transmitting/receiving apparatuses of a wideband radio channel measuring device using a multi-carrier. The wideband radio channel measuring device using the multi-carrier may measure radio channel characteristics at a frequency domain. Since the radio channel is measured at the frequency domain by the wideband radio channel measuring device using the multi-carrier, the channel characteristics may be simultaneously measured while maintaining a maximum Doppler measurement frequency at a predetermined level regardless of increase of the number of transmitting and receiving antennas, in an MIMO configuration. | 12-04-2008 |
20090088116 | METHOD AND APPARATUS OF SUCCESSIVE INTERFERENCE CANCELLATION FOR WIRELESS COMMUNICATION SYSTEM - A method and apparatus of successive interference cancellation for a wireless communication system is provided. A method of detecting a transmission signal for the method of the successive interference cancellation, the method including: receiving transmission signals transmitted from ‘M’ antennas; calculating a residual error value of each of the received transmission signals; and determining a detection sequence of the transmission signals based on the calculated residual error value. | 04-02-2009 |
20090231990 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING MULTIPLE CODEWORDS IN SC-FDMA SYSTEM - The present invention relates a method and apparatus for transmitting/receiving data using multiple codewords in a communication system using SC-FDMA (single carrier frequency division multiple access). A transmitter generates the multiple codewords for user data and transmits the generated multiple codewords. A receiver receives the multiple codewords and sequentially performs decoding and SIC (successive interference cancellation) on the received multiple codewords. Therefore, this structure can minimize a PAPR (peak to average power ratio) and considerably reduces interference between symbols in a frequency selective fading environment. | 09-17-2009 |
20090232247 | INTERCELL INTERFERENCE MITGATION APPARATUS AND METHOD - There is provided an intercell interference mitigation apparatus for use in a terminal having a single reception antenna in a multi-cell downlink of an OFDMA system. The apparatus includes one or more parallel interference cancellers for canceling intercell interference by respreading soft decision values of cells other than a self cell; one or more LLR creation blocks for creating channel LLRs required for the soft decision for each of subcarriers, and producing channel soft outputs; one or more soft deciders for performing a soft decision of a self user symbol of the self cell in which interferences from other users are mitigated, and producing the soft decision values; and one or more channel estimation blocks for performing iterative channel estimation by respreading symbols of the soft decision values produced from the soft deciders. | 09-17-2009 |
20090241120 | SYSTEM AND METHOD FOR CONTROLLING PRIORITY IN SCA MULTI-COMPONENT AND MULTI-PORT ENVIRONMENT - A system for controlling priority in a SCA-based application having a plurality of components wherein each of the components has a plurality of ports, includes: a priority component scheduler, interworking with the plurality of components wherein component priority order of the components is arranged therein; and a priority port scheduler that is provided in each of the components including the plurality of the ports which are associated with connections between the components, wherein port priority order of the ports included in each of the components is arranged therein. The priority component scheduler may be generated by using domain profiles in which component priority values of the components are set and the priority port scheduler may be generated by using domain profiles in which port priority values of the ports included in each of the components are set. Further, the domain profiles may be XML files. | 09-24-2009 |
20090304125 | ITERATIVE RECEIVER AND METHOD FOR DETECTING TRANSMITTED SIGNAL THEREOF - In an iterative receiver, a signal detector estimates interference from an estimated transmitted signal, and cancels the estimated interference from a signal received through an antenna. A decoder performs channel decoding by using the interference cancelled received signal. A soft decision unit performs a soft decision process on the transmitted signal by using the channel decoded signal. A channel estimator estimates a channel by using the soft decision applied transmitted signal and the received signal. A covariance estimator estimates covariance on the sum signal of the interference and noise by using the soft decision applied transmitted signal, the received signal, and the estimated channel. A hard decision unit determines the transmitted signal by using the channel decoded signal after interference cancellation, channel decoding, estimated transmitted signal updating, channel estimation, and covariance estimation are iterated a number of times. | 12-10-2009 |
20090312030 | RELAY STATION, TERMINAL AND BASE STATION IN CELLULAR SYSTEM, AND METHOD FOR RELAYING BETWEEN TERMINAL AND BASE STATION - Disclosed are a base station, a relay station, and a terminal according to a method for designing a cellular system for improving resource usage efficiency by reducing interference between relay stations and interference between the base station and the relay station. The relay station gets control signals that terminals served by the base station transmit, and registers terminals, levels of the control signals of which are bigger than a predetermined value, to a list of the interference terminals. The relay station checks an interference resource through resource allocation information of the base station, checks an available resource corresponding to a resource except the interference resource among a resource allocated by the base station, and allocates some of the available resource to the terminal. | 12-17-2009 |
20100034110 | ITERATIVE RECEPTION METHOD AND ITERATIVE RECEIVER - An iterative reception method and iterative receiver in a mobile communication system are provided. In order to remove inter-cell interference of a signal that is iteratively received in a multi-cell environment, a soft determination value of different cells excluding a specific cell is re-spread to be used. In addition, in order to improve reception performance of the iterative receiver that performs the interference removal by using the soft determination value, channel estimation is iteratively performed on the iteratively received signal by using a soft determination value of a previous order of the specific cell to update a channel estimation value. Accordingly, it is possible to reduce complexity of implementation and effectively remove the inter-cell interference by using the soft determination value. | 02-11-2010 |
20100039927 | PILOT TRANSMITTING APPARATUS AND METHOD FOR SC-FDMA SYSTEM - Provided are a pilot transmitting apparatus and method capable of selectively using an OFDMA scheme and an SC-FDMA scheme. The pilot transmitting apparatus includes a pilot inserter for inserting a pilot signal in a modulated symbol and inserting a cyclic prefix code for the inserted pilot signal, an FFT processor for receiving symbols with a pilot inserted thereto from the pilot inserter and performing an FFT process on the received symbols, an IFFT processor for receiving the transformed data from the FFT processor and performing an IFFT process on the transformed data, a mapping processor for mapping the output of the FFT processor to input positions of the IFFT processor to load the frequency domain transformed data on predetermined sub-carriers, and a cyclic prefix inserter for inserting a cyclic prefix code for the output of the IFFT processor. | 02-18-2010 |
20100042666 | METHOD AND DEVICE FOR DETECTING TRANSMISSION SIGNAL WITH DIVISION DETECTION - The present invention relates to a method and device for detecting a transmission signal on the basis of a received signal by applying a division and detection algorithm. An embodiment of the invention provides a method of detecting a transmission signal including: obtaining a unitary matrix and an upper triangular matrix by performing a sorted QR-decomposition algorithm with respect to a matrix indicating a channel state; calculating a vector y by multiplying a transpose matrix of the unitary matrix by the received signal Y; dividing the upper triangular matrix R into a plurality of sub-upper triangular matrices and dividing the calculated vector y into a plurality of sub-vectors so as to correspond to the divided plurality of sub-upper triangular matrices; and detecting a lattice point corresponding to each of the divided sub-vectors using the divided plurality of sub-upper triangular matrices. | 02-18-2010 |
20100046361 | DEVICE AND METHOD FOR TRANSMITTING AND RECEIVING PILOT SIGNAL IN WIRELESS COMMUNICATION SYSTEM - Disclosed is a pilot signal transmitting/receiving device and method in a wireless communication system. When generating a pilot signal block that is shorter than the length of a data signal, a frequency for each predetermined pilot signal block is transitioned so as to guarantee frequency domain channel estimation performance. A cyclic prefix according to the length of the transitioned pilot signal is added to the pilot signal, a data signal is time division multiplexed together with the pilot signal, and a resultant signal is transmitted through an antenna. In advance to this, a position of a subcarrier for transmitting the pilot signal and the data signal is determined, a data signal is mapped on the determined subcarrier, and in this instance, diversity on the channel for a symbol is used to map the data signal on the transmission method using one of the localized FDMA (L-FDMA) channel and the distributed FDMA (D-FDMA) channel. Therefore, the frequency resolution in the frequency domain is maintained to thus provide high-quality channel estimation performance. | 02-25-2010 |
20100075672 | MULTIPLE ANTENNA WIRELESS COMMUNICATION SYSTEM WHICH ADAPTIVELY DETERMINES DOWNLINK TRANSMISSION MODE - An operation method of a base station which adaptively determines a downlink transmission mode is provided. The operation method of the base station including: adaptively determining a downlink transmission mode based on at least one of a state of a channel between the base station and a terminal, and a number of receiving antennas, the number of receiving antennas being at least one and the receiving antennas being mounted on the terminal; selecting one of at least one type of feedback information which is fed back by the terminal based on the determined downlink transmission mode; and reporting type information associated with the selected type to the terminal. | 03-25-2010 |
20100099352 | APPARATUS AND METHOD FOR RELAYING BETWEEN A BASE STATION AND A MOBILE STATION, AND THE BASE STATION - Disclosed is a cooperative relay station that relays between a base station and a mobile station when retransmitting a signal. Also, disclosed is a base station that receives a signal from a mobile station in mutual cooperation with the cooperative relay station. After the cooperative relay station receives and decodes a signal that the mobile station transmits to the base station or a service relay station, if an error of the decoded signal does not exist, it stores the received signal. If an error occurs when the base station decodes the signal that the mobile station transmits, the base station requests retransmission for the signal with the error to the cooperative relay station. If the cooperative relay station gets a request of retransmission, it transmits the signal that the base station requests to the base station. In this was, since an error rate may be reduced when the base station requests retransmission of the signal, resource reuse efficiency may become improved, interference may be reduced, and it is easy to adapt to a service being sensitive to time delay. | 04-22-2010 |
20100115363 | COOPERATIVE H-ARQ SUPPORTING METHOD - In the hybrid automatic repeat request (H-ARQ) supporting method for cooperative transmission, a receiver selects one H-ARQ repeat method from among the chase combining method and the incremental redundancy method according to the SNR when the data packet cooperatively transmitted by transmitters generates an error. Also, the method for the receiver to select a repeat transmitter includes a method for selecting a repeat transmitter in advance, a method for removing a transmitting node from a repeat transmitter group when the SNR of the transmitting node is low, and a method for estimating the SNR of each transmitter for each predetermined time frame and selecting the transmitter having the greatest SNR as the repeat transmitter. | 05-06-2010 |
20100150217 | CHANNEL ESTIMATION APPARATUS AND METHOD IN MOBILE COMMUNICATION SYSTEM HAVING DISPERSED PILOT - Provided are a channel estimation method and apparatus in mobile communication system having dispersed pilot. The channel estimation apparatus includes an entire band channel estimation unit and an edge channel estimation unit. The entire band channel estimation unit performs channel estimation on an entire frequency band. The edge channel estimation unit performs channel estimation on an edge region. By separately performing the gating operation of the entire band channel estimation unit and the gating operation of the edge channel estimation unit, a channel frequency response is more accurately calculated even in an edge region. | 06-17-2010 |
20100157877 | METHOD AND APPARATUS FOR ALLOCATING SEQUENCE TO SYNCHRONIZATION CHANNEL FOR NODE IDENTIFICATION IN WIRELESS COMMUNICATION SYSTEM - Provided is an apparatus for allocating a sequence to a synchronization channel for a node identification (ID), the apparatus including: a base node sequence generator to generate a base sequence that is a sequence for a node ID of a base node; a relay node sequence generator to generate a relay sequence that is a sequence for a node ID of a relay node by transforming the base sequence; a baseband signal generator to generate a baseband signal by mapping the base sequence or the relay sequence to a frequency domain and a time domain; and a transmitter to transmit the baseband signal. | 06-24-2010 |
20100158088 | PORTABLE APPARATUS AND METHOD OF MEASURING WIRELESS CHANNEL AND MULTIPLE ANTENNA CORRELATION - A portable apparatus of measuring a wireless channel and a multiple antenna correlation, the apparatus including: a Radio Frequency (RF) unit to control a frequency of a signal to be measured, to broadcast the signal to be measured through multiple transmission antennas, to control a frequency of a received signal, and to send the received signal to the baseband unit, the received signal being received through multiple receiving antennas; and a baseband unit to generate and transmit, to the RF unit, the signal to be measured, to measure wireless channels for each of the multiple transmission antennas and wireless channels for each of the multiple receiving antennas based on the received signal output from the RF unit, to calculate a correlation for each of the multiple transmission antennas, and to calculate a correlation for each of the multiple receiving antennas based on the wireless channels for each of the multiple transmission and receiving antennas. | 06-24-2010 |
20100159854 | METHOD AND APPARATUS FOR ADAPTIVELY CONTROLLING RECEIVED POWER OF MULTI-ANTENNA RADIO CHANNEL MEASUREMENT EQUIPMENT - Provided is an apparatus for adaptively controlling a received power of a multi-antenna radio channel measurement equipment, the apparatus including: a plurality of antennas to receive a measurement signal; a switch unit comprising a plurality of switches to input the measurement signal; a switch control unit to control the plurality of switches of the switch unit to sequentially input the measurement signal; a reception (Rx) attenuator to adjust a Received Signal Strength Indication (RSSI) of the measurement signal; an Rx AGC control unit to control the Rx attenuator to adaptively adjust the RSSI of the measurement signal; a timing control unit to generate a reference timing signal for the switch control unit and the automatic RSSI control unit; and a digital baseband control unit to collect and store information associated with the measurement signal. | 06-24-2010 |
20100217763 | METHOD FOR AUTOMATIC CLUSTERING AND METHOD AND APPARATUS FOR MULTIPATH CLUSTERING IN WIRELESS COMMUNICATION USING THE SAME - An automatic clustering method using an Average-linkage algorithm and a KPower Means algorithm, and a method and apparatus for multi-path clustering required for a spatial channel modeling (SCM) in a wireless communication environment are provided. The automatic clustering method, including: a first step of obtaining an initial cluster centroid using a hierarchical clustering algorithm; a second step of moving the initial cluster centroid using a two dimensional clustering algorithm; a third step of clustering a data set according to the moved initial cluster centroid; and a fourth step of calculating a validation index with respect to the clustered data set and determining an optimal number of clusters. | 08-26-2010 |
20100248634 | METHOD OF CYCLIC DELAY DIVERSITY WITH THE OPTIMAL CYCLIC DELAY VALUE, AND TRANSMITTER PERFORMING THE SAME - Disclosed are an apparatus and method of determining an optimal cyclic delay value. The method of determining the optimal cyclic delay value includes determining a Signal-to-Interference and Noise Ratio (SINR) function depending on a diversity order; determining a channel estimation error variance function; and determining an SINR being required for a system according to the SINR function and the channel estimation error variance function. | 09-30-2010 |
20100260078 | MULTI-ANTENNA RADIO CHANNEL MEASUREMENT SYSTEM AND METHOD WHICH GENERATES TIME DIVISION DUPLEX TIMING SIGNAL AND MEASURES TWO-WAY RADIO CHANNEL - The present invention relates to a multi-antenna radio channel measurement system and method which generates a Time Division Duplex (TDD) timing signal and measures a two-way radio channel. The multi-antenna radio channel measurement system which measures a probing signal for measuring a radio channel, the multi-antenna radio channel measurement system including: a baseband unit alternately transmits the probing signal for measurement and receives the received channel signal to be measured based on a TDD synchronization time; a synchronization unit which obtains time synchronization with the other radio channel measurement system, generates a transmission/reception synchronization signal, and provides the transmission/reception synchronization signal to the baseband unit; a transceiver unit which up converts the probing signal for measurement and down converts the received channel signal; and a radio frequency (RF) front-end unit which switches suitable antennas according to a timing control signal of the baseband unit. | 10-14-2010 |
20100266069 | ITERATIVE RECEIVER AND ITERATIVE DECODER - An iterative receiver and an iterative decoder are provided. The iterative receiver includes: an external decoder to decode the detected received signal; an impurity adder to add an impurity to an output signal of the external decoder; an interleaver to perform interleaving between the internal detector and the external decoder; and a de-interleaver to perform de-interleaving between the internal detector and the external decoder. | 10-21-2010 |
20100266073 | ACCELERATED TURBO TRANSCEIVER AND METHOD FOR MIMO SYSTEM - A reception apparatus including: a detection unit detecting extrinsic information based on a tentative symbol decision signal, a channel estimation signal, a noise variance estimation signal, and a received signal that are obtained from a previous iteration process; a Cyclic Redundancy Check (CRC) aided channel decoding unit outputting an interleaved bit or a posteriori information thereof based on the extrinsic information; a tentative symbol decision unit determining a tentative transmission symbol based on an output of the CRC aided channel decoding unit; a channel estimation unit estimating a channel based on an output of the tentative symbol decision unit; and a noise variance estimation unit estimating a noise variance based on the output of the tentative symbol decision unit and an output of the channel estimation unit is provided. | 10-21-2010 |
20100271953 | MULTI-ANTENNA RADIO CHANNEL MEASUREMENT SYSTEM AND METHOD FOR TWO-WAY RADIO CHANNEL MEASUREMENT - The present invention relates to a multi-antenna radio channel measurement system and method for a two-way radio channel measurement, including: Control & Console Software to select a radio measurement mode, generate a probing signal for measurement, receive input parameters to be measured, and deliver the parameters to a baseband unit; a baseband unit (BBU) to set a transmission/reception frequency band and bandwidth and set a timing using the selected radio measurement mode and the received input parameters; a timing unit to synchronize a time with another radio channel measurement system to generate a transmission/reception synchronization signal, and provide the transmission/reception synchronization signal to the BBU; a transceiver unit (TRXU) to up-convert the probing signal for measurement and down-convert the reception channel signal; and a radio frequency (RF) front-end unit (RFFU) to switch to a suitable antenna according to a timing control signal of the BBU. | 10-28-2010 |
20100272002 | METHOD FOR TRANSMITTING AND RECEIVING MULTICAST AND BROADCAST SERVICE - A terminal receives a map scheduling interval that is set to be greater than a multicast and broadcast service map transmission cycle by a base station from the base station, and receives a multicast and broadcast service map from the base station according to the received map scheduling interval. | 10-28-2010 |
20100279600 | RELAY NETWORK AND ENTITY FOR CONTINUOUS TRANSMISSION BASED ON SUPERPOSITION CODING - Disclosed is a method of using relay that may continuously transmit data without time division based on superposition coding in a communication system. When transmission of a relay-supported user signal via a base station-relay link is performed, the method of using relay based on the superposition coding reuses a resource allocated to a direct-transmission user based on the superposition coding to perform the transmission. According to example embodiments, a separate resource for the base station-relay link may not be needed, and continuous relay transmission is possible without time division, thereby substantially increasing frequency efficiency and reducing a transmission delay caused by the use of the relay. | 11-04-2010 |
20100303032 | METHOD AND SYSTEM FOR OPERATING COOPERATIVE RECEIVING DIVERSITY SCHEME AND SELECTIVE COOPERATIVE RELAYING - A selective cooperative relaying method, the method including: determining, by a base station, whether a mobile station for which the base station provides a service is the mobile station necessary for direct transmission or is the mobile station necessary for cooperative relaying via a relay station; and selecting, by a base station, mobile stations using a simple relaying scheme, a cooperative transmission diversity scheme, or a cooperative receiving diversity scheme from mobile stations necessary for the cooperative relaying via the relay station. | 12-02-2010 |
20100315961 | APPARATUS AND METHOD OF TRANSMITTING AND RECEIVING RECEPTION ACKNOWLEDGMENT SIGNAL IN MOBILE COMMUNICATION SYSTEM - Provided are apparatus and method of transmitting and receiving a reception acknowledgment signal in a mobile communication system. The apparatus and method of receiving the reception acknowledgment signal includes respectively calculating a probability that the received reception acknowledgment signal is a reception success signal and a probability that the reception acknowledgment signal is a reception failure signal, by using an estimated packet error rate predicted based on a pre-set required packet error rate and determining whether the reception acknowledgment signal is the reception success signal or the reception failure signal. The apparatus and method of transmitting a reception acknowledgment signal includes determining transmission powers of a reception success signal and a reception failure signal in order to maximize a difference between a first complex signal and a second complex signal, the first complex signal being modulated for the reception success and the second complex signal being modulated for the reception failure, based on the average transmission power and a pre-set required packet error rate. The apparatus and method of transmitting reception acknowledgment signals transmits a single packet indicating reception successes or failures for a plurality of received data packets by using variable length coding based on a pre-set required packet error rate. According to the present invention, non-uniformity of frequency between the reception success signal and the reception failure signal is considered to increase correct reception rate of the reception acknowledgment signal. | 12-16-2010 |
20100316013 | SCHEDULING METHOD AND APPARATUS FOR SPATIAL REUSE - A scheduling method of giving a chance for transmission to a plurality of terminals in the same time period, and a device therefor are provided. The scheduling method includes: transmitting first scheduling information to terminals in a network, the first scheduling information defining transmitting/receiving terminals and a transmission time period; receiving channel measurement information including inter-terminal interference information from the terminals in the network; and generating second scheduling information defining transmission time periods and a plurality of transmitting/receiving terminals that do not interfere with each other by using the channel measurement information. | 12-16-2010 |
20100316165 | APPARATUS AND METHOD OF TRANSMITTING/RECEIVING SIGNALS USING SIGNALING POINT ROTATION AT MUTUAL COOPERATION TRANSMISSION - An apparatus for and method of transmitting and/or receiving a signal by using signaling point rotation in mutually cooperative relaying are provided. The apparatus for transmitting a signal includes: a rotated I-channel generation unit rotating a symbol containing data of a first user, by a predetermined angle, and then, obtaining the I-channel (in-phase) component of the rotated symbol; a rotated Q-channel generation unit receiving a symbol rotated by a predetermined angle, of a previous time slot from a node of a second user performing mutually cooperative relaying with the node of the first user, detecting the I-channel component, and obtaining the Q-channel (quadrature-phase) component of a symbol containing data of the second user from the detected I-channel component; and a combining unit combining the I-channel component of the first user generated in the rotated I-channel generation unit and the Q-channel component of the second user generated in the rotated Q-channel generation unit, thereby generating one symbol. | 12-16-2010 |
20100322109 | INTERFERENCE MITIGATION METHOD IN CELLULAR SYSTEM BASED ON ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS - An inter-cell interference mitigation method in an orthogonal frequency division multiple access (OFDM)-based cellular system includes: dividing wireless resources into a resource group for fractional frequency reuse and a resource group for removing inter-cell interference; and re-dividing the resource group for fractional frequency reuse into particular resource groups numbering the same as a number of cell types of fractional frequency reuse, and applying a maximum transmission power to a particular resource group according to a cell type for fractional frequency reuse. | 12-23-2010 |
20100322217 | METHOD FOR SUPPORTING IDLE MODE IN WIRELESS LOCAL AREA NETWORK SYSTEM - Disclosed is a method for supporting an idle mode of a terminal in a wireless local area network (WLAN) system. In the method, a first request message for starting an idle mode is transmitted to a first access node to which the terminal is currently connected and a first response message with respect to the first request message is received from the first access node, and in this case, when the first response message includes acceptance information with respect to the start of the idle mode, the idle mode starts. | 12-23-2010 |
20110004798 | Cooperation Communication Method and System Using Feedback Signal - Disclosed are a cooperation communication method and system using feedback signals. The cooperation communication method includes transmitting a packet to a base station by a terminal, determining, by the terminal, whether decoding of the transmitted packet is successfully performed using a feedback signal from the base station, and re-transmitting the packet to the base station by the terminal according to whether decoding of a packet of an adjacent terminal within a prescribed distance from the terminal is successfully performed. | 01-06-2011 |
20110044271 | TRANSMISSION/RECEPTION APPARATUS AND METHOD FOR FRAME INCLUDING PROTOCOL VERSION IN ULTRA WIDEBAND SYSTEM - Provided is a transmission/reception apparatus and method for transmitting a frame in an ultra wideband radio communication system, which may enable a protocol version to be included in a fixed-length physical layer protocol (PHY) header so that interaction between systems using different protocol versions may be realized, and may enable information about a modulation and coding scheme to be included in a variable-length PHY header to thereby overcome a decoding delay problem occurring due to a Reed Solomon code. | 02-24-2011 |
20110051746 | METHOD AND APPARATUS FOR GENERATING DATA FRAME, AND METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING DATA FRAME IN WIRELESS COMMUNICATION SYSTEM - A method for generating a data frame in a wireless communication system includes generating a plurality of first headers having information about the number of segments of a payload, generating a plurality of second headers having information about a transmission mode and a length of predetermined segments among segments of the payload, generating a third header having a transmission mode and a length of remaining segments of the payload; generating a fourth header having supplementary information of the payload and error information of the supplementary information and the first to third headers or error information of the supplementary information and the third header; and generating a data frame with the first to fourth headers sequentially allocated. | 03-03-2011 |
20110051822 | PREAMBLE GENERATION METHOD AND APPARATUS OF STATION, AND DATA FRAME GENERATION METHOD - A preamble generation method of a station includes: generating a base sequence for channel estimation; generating an antenna channel estimation sequence for at least one or more antennas of the station; generating a preamble by allocating at least one or more modified sequences to frequency domains for at least one or time periods. The modified sequences are generated by using the base sequence, the antenna channel estimation sequence, and a control sequence for estimating at least one or more channels. | 03-03-2011 |
20110096863 | WIRELESS TRANSMITTER FOR HIGH MOBILITY AND HIGH THROUGHPUT AND MODE CONTROL METHOD THEREOF - A wireless transmitter which performs reconfiguration for high mobility and high throughput includes: an operation mode decision unit configured to decide an operation mode depending on mobility, a required data rate, and wireless link performance; a clock generation unit configured to generate a plurality of clock signals; a selection unit configured to select necessary clock signals among the plurality of clock signals generated by the clock generation unit according to the operation mode decided by the operation mode decision unit; and at least one or more digital modulation units configured to modulate transmitted data by adjusting a signal bandwidth of a frequency domain and a transmission time of a time domain using the clock signals selected by the selection unit. | 04-28-2011 |
20110105163 | METHOD FOR INTER-CELL INTERFERENCE MANAGEMENT IN CELLULAR SYSTEM - Provided is a method for inter-cell interference management in a cellular system. More particularly, provided is a method for inter-cell interference avoidance that may not require signaling between base stations and a complex cell planning. | 05-05-2011 |
20110122812 | SEAMLESS SERVICE METHOD CONTROLLED BY USER TERMINAL - Provided are a seamless service method controlled by a user terminal, the method including: storing radio access technology (RAT) information and service flow information associated with a connecting radio access network (RAN); when a new link is detected, storing RAT information associated with the new link; verifying whether a new RAN satisfying a handover initiation criterion exists; when the new RAN exists, attempting a link connection with the new RAN; being assigned with an Internet Protocol (IP) to be used in the new RAN; setting up a handover service flow using the new RAN; and receiving a service via multiple paths using a connecting service flow and the handover service flow. Through this, it is possible to provide the seamless QoS even while the handover is being performed. | 05-26-2011 |
20110130090 | RF RELAY OF FULL-DUPLEX AND METHOD FOR REMOVING INTERFERENCE OF EM LEVEL THEREOF - A RF relay of a full-duplex generates a conversion matrix to belong to a null space of a channel matrix of an interference channel, generates a transmitting signal by converting a received signal using the conversion matrix, and then outputs the transmitting signal to a transmitting antenna. Therefore, an interference signal of an electromagnetic wave level (EM level) that can be generated while the transmitting signal passes through the interference channel can be canceled. | 06-02-2011 |
20110140746 | DUAL-BAND WIDEBAND LOCAL OSCILLATION SIGNAL GENERATOR - A dual-band wideband local oscillation signal generator includes an oscillation unit, a division unit, a poly phase filter (PPF), a switch unit, and a single side band (SSB) mixer. The oscillation unit is configured to generate a positive in-phase (IP) signal, a negative in-phase (IN) signal, a negative quadrature-phase (QN) signal, and a positive quadrature-phase (QP) signal. The division unit is configured to divide frequencies of the IP signal and the IN signal and generate an RF signal. The PPF is configured to receive the IP signal and the IN signals inputted to the division unit, and generate an LO IP signal, an LO IN signal, an LO QP signal, and an LO QN signal. The switch unit is configured to receive the generated LO signals and select a high band frequency signal or a low band frequency signal. | 06-16-2011 |
20110149856 | APPARATUS AND METHOD FOR RECEIVING/TRANSMITTING DATA IN WIRELESS COMMUNICATION SYSTEM - A data receiving apparatus includes a receiving unit configured to receive a beacon packet from at least one base station, a searching unit configured to search an index of a subchannel including an optimal channel state among subchannels allocated to a sector divided through spatial multiplexing based on the base station using the beacon packet, a calculating unit configured to calculate a final back off time by adding a slot time of the subchannel index and a random time, and a transmitting unit configured to include the searched subchannel index in a beacon response packet and transmit the beacon response packet after the calculated final back off time. | 06-23-2011 |
20110150139 | CALIBRATION METHOD FOR Tx/Rx PATH CHARACTERISTIC OF CHANNEL SOUNDER - The method includes performing a wired back-to-back test by forming M wired paths connecting one of the N transmission antennas with the M reception antennas through M cables, separating i | 06-23-2011 |
20110158302 | ITERATIVE ESTIMATOR AND METHOD OF CHANNEL AND NOISE VARIANCE FOR MULTIPLE INPUT MULTIPLE OUTPUT ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM - A reception apparatus including: a detection unit detecting extrinsic information based on an output of a tentative symbol decision unit, an output of a channel estimation unit, and an output of a noise variance estimation unit that are obtained from a previous iteration process; a Cyclic Redundancy Check (CRC) aided channel decoding unit outputting an encoded and interleaved bit, or a posteriori information thereof based on the extrinsic information; the tentative symbol decision unit determining a tentative transmission symbol based on an output of the CRC aided channel decoding unit; the channel estimation unit estimating a channel based on an output of the tentative symbol decision unit or a pilot symbol; and the noise variance estimation unit estimating a noise variance or an initial noise variance based on the output of the tentative symbol decision unit and the output of the channel estimation unit is provided. | 06-30-2011 |
20110171990 | TERMINAL, METHOD, AND WIRELESS COMMUNICATION FOR POWER SAVING - Provided are a terminal for power saving, a power saving method of the terminal, and a wireless communication system for power saving. A receiving terminal may receive scheduling information associated with data transmission and reception of a transmitting terminal. The receiving terminal may directly communicate with the transmitting terminal by referring to the scheduling information. | 07-14-2011 |
20110182187 | WIRELESS COMMUNICATION SYSTEM AND METHOD FOR PERFORMING COOPERATIVE DIVERSITY USING CYCLIC DELAY - A wireless communication system and method of performing cooperative diversity using cyclic delay is provided. A transmitting terminal constituting the wireless communication system includes: a data transmitter configured to transmit data to each of at least one relay terminal and a receiving terminal; an error detection result receiver to receive an error detection result from a relay terminal that detects an error in the data among the at least one relay terminal; and a data retransmitter configured to retransmit data to the receiving terminal when it is determined each of the at least one relay terminal detects the error in the data based on the error detection result. | 07-28-2011 |
20110199994 | SYSTEM AND METHOD OF ALLOCATING CHANNELS FOR MULTIPLE TRAFFIC STREAMS - Provided is a system and method that may allocate channels with respect to multiple traffic channels. A channel request apparatus may determine a correlation between traffic streams to which channels are allocated, and to determine whether the traffic streams are related to each other, may generate a channel allocation request message that simultaneously requests channel allocation with respect to related traffic streams that are related to each other, and may transmit the channel allocation request message to a channel response apparatus to request the channel allocation with respect to the related traffic channels. | 08-18-2011 |
20110205968 | Method and apparatus for performing sounding in wireless communication system - A sounding method of a transmitting terminal that transmits data to two or more receiving terminals in a wireless communication system includes transmitting a frame for requesting transmission of first sounding information to the two or more receiving terminals, receiving a frame including the first sounding information from each of the two or more receiving terminals, transmitting a frame including information for requesting transmission of channel state information and second sounding information to the two or more receiving terminals, and receiving a frame including the channel state information, which is measured by each of the two or more receiving terminals by using the second sounding information, from each of the two or more receiving terminals, wherein the channel state information measured by using the first sounding information and the channel state information received from each of the two or more receiving terminals are used to simultaneously transmit the data to the two or more receiving terminals. | 08-25-2011 |
20110244790 | RELAY AND METHOD FOR SIGNAL TRANSMISSION THEREOF - A method for signal transmission of a relay, includes estimating a first modulation/demodulation channel between a transmitter and the relay and a second modulation/demodulation channel between the relay and a receiver, and an interference channel of the relay, receiving a radio frequency signal from a transmitter, generating a transformation vector using the channel estimate in order to reduce self-interference of the relay under a predetermined level, converting the radio frequency signal using the transformation vector, and transmitting the converted radio frequency signal to the receiver. | 10-06-2011 |
20110280168 | METHOD FOR REDUCING POWER CONSUMPTION IN WIRELESS COMMUNICATION SYSTEM - A method for reducing power consumption in a wireless communication system includes: generating a descramble initial value by using at least some bits of identification information of an STA, which is known to an AP or base station and the STA; generating a first descramble sequence by using the generated descramble initial value and comparing at least some bits of the generated first descramble sequence with at least some bits of a service field of a currently-received signal; as the comparison result, when it is determined that the destination of the currently-received signal is not set to the STA, stopping the signal reception; and as the comparison result, when it is determined that the destination of the currently-received signal is set to the STA, generating a second descramble sequence by using the descramble initial value and descrambling the currently-received signal. | 11-17-2011 |
20110280182 | PACKET TRANSMISSION/RECEPTION METHOD AND APPARATUS IN WIRELESS COMMUNICATION SYSTEM - A method for simultaneously transmitting packets to one or more users in a wireless communication system includes: generating the packets which include length information and are to be transmitted to the one or more users; and simultaneously transmitting the generated packets to the one or more users. The length information includes information representing a unit of the length information and information representing lengths of the packets according to the unit. | 11-17-2011 |
20110312370 | METHOD AND APPARATUS FOR SUPPORTING DISCONTINUOUS OPERATION OF BASE STATION IN WIRELESS COMMUNICATION SYSTEM AND CONTROL SYSTEM THEREOF - An operation control method in a base station of a wireless communication system includes: checking whether or not an allowed mobile station exists in coverage of the base station and overall coverage of base stations adjacent to the base station; and controlling the base station to perform transmission/reception at a predetermined period through a first discontinuous operation, when the allowed mobile station does not exist in the coverage of the base station and the overall coverage of the adjacent base stations. | 12-22-2011 |
20120020432 | METHOD FOR ESTIMATING MIMO CHANNEL USING LOOSELY SYNCHRONOUS CODES, AND APPARATUS USING THE SAME - Disclosed are a method and apparatus for estimating a Multiple Input Multiple. Output (MIMO) channel. A signal transmission method for estimating the MIMO channel via 2N transmission antennas (N is greater than or equal to “1”) includes generating a code having a predetermined Interference Free Window (IFW), and transmitting the code via two transmission antennas. | 01-26-2012 |
20120063410 | METHOD FOR SELECTING COMMUNICATION CHANNEL IN COMMUNICATION DEVICE OF WIDEBAND WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - Provided is a method and apparatus for setting up a channel for communication between distributed devices in a wireless communication system. A method of selecting a communication channel in a communication device of a wireless communication system may include requesting scanning of channels between the communication device and a discovery device, receiving a channel scanning response message including a Distributed Reservation Protocol (DRP) Availability Information Element (IE) assigned for each scanned channel, and selecting a channel based on the DRP Availability IE. | 03-15-2012 |
20120082109 | METHOD AND APPARATUS FOR CONTENTION-BASED CHANNEL ACCESS WITH DIRECTIONAL ANTENNA OVER WIDEBAND HIGH FREQUENCY WIRELESS SYSTEM - Provided are a method of performing contention based channel access by classifying a contention period into a beamformable contention period in which a beamforming is allowed and a non-beamformable contention period in which the beamforming is interrupted so as to resolve an issue regarding channel access occurring due to an introduction of a directional antenna for handling a path loss in a wideband wireless communication system according to an embodiment of the present invention, and a method for maximizing a spatial reuse gain by managing, for each direction, information about a transmission time of a message received from a dispersion device. | 04-05-2012 |
20120082142 | METHOD OF ALLOCATING RADIO RESOURCE AND TRANSMITTING DATA - Provided is a data transmission method. The data transmission method may limit a use authorization for a contention time period so that a portion of data transmission devices among a plurality of data transmission devices may transmit data during the contention time period. | 04-05-2012 |
20120106575 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING DATA IN COMMUNICATION SYSTEM - Disclosed is an apparatus and method for transmitting/receiving data using a low-density parity check (LDPC) coding scheme in a communication system. The method includes generating a multi-user data packet containing data to be transmitted to a plurality of users, encoding the multi-user data packet as a BCC and an LDPC code, and transmitting the encoded multi-user data packet to the plurality of users. In the method, the encoding of the multi-user data packet encodes MPDU subframes corresponding to each of the plurality of users in the multi-user data packet as the LDPC code, and calculates information on a length in LDPC encoding, corresponding to the encoding of the multi-user data packet as the LDPC code. | 05-03-2012 |
20120113975 | NETWORK EMPLOYING SPACE RECYCLING, AND A METHOD FOR MANAGING THE NETWORK - A method of operating a network coordinator for a spatial reuse scheme includes receiving a reservation request for a time period for a data communication of a target transmitter/receiver pair that uses a directional antenna, searching for a time period reserved in advance for another transmitter/receiver pair, from a Channel Time Allocation Period (CTAP) that is a contention-free access period for the data communication, and reserving a time period for the target transmitter/receiver pair in the CTAP, so that the time period reserved for the target transmitter/receiver pair overlaps the time period reserved in advance for the other transmitter/receiver pair. | 05-10-2012 |
20120155516 | MULTI-LINK WIRELESS CHANNEL SOUNDER AND MULTI-LINK WIRELESS CHANNEL MEASUREMENT METHOD THEREOF - A multi-link wireless channel sounder is provided. The multi-link wireless channel sounder includes a multi-input multi-output (MIMO) antenna unit, a transmitter (TX) signal processing unit configured to transmit via the MIMO antennas one or more TX wireless channel signals to be transmitted via a wireless channel, a receiver (RX) signal processing unit configured to receive and process one or more RX wireless channel signals that are received from multiple links via the MIMO antenna unit, and a control unit configured to receive an operation mode selection signal that indicates a TX mode or an RX mode from a user and to control the TX signal processing unit or the RX signal processing unit to operate selectively in accordance with the operation mode selection signal. | 06-21-2012 |
20120163217 | Structure of Adaptive Multiple Antennas and Communication Device and Method Using Adaptive Multiple Antennae - The present invention relates to communication using multiple antennas, and more particularly, to an apparatus and method for adaptively adjusting, based on a channel environment, an interval and direction of multiple antennas each of a transmitter and a receiver. A communication method according to the present invention may include verifying information about a channel state based on a pilot signal transmitted for each antenna of a transmitter, adjusting intervals among antennas of a receiver based on the information about a channel state, calculating transmission capacity values according to the adjusted intervals among antennas, and setting an antenna to an antenna interval corresponding to a transmission capacity having a highest value among the transmission capacity values calculated. | 06-28-2012 |
20120169374 | APPARATUS AND METHOD FOR OBTAINING MAXIMUM VALUE AND MINIMUM VALUE IN PLURALITY OF DIGITAL INPUT SIGNALS - The present invention relates to a digital signal processing circuit, and more particularly, to a method and apparatus for generating a maximum value or a minimum value used for designing the digital signal processing circuit. An apparatus for obtaining a maximum value or a minimum value from N digital input signals may include N×W bit processing elements to receive an input of W bits of each of the N digital input signals, W OR operators to receive an input of N operation values output from bit processing elements, and to perform an OR operation, respectively, and W inverters to invert an output value for each of the W OR operators. | 07-05-2012 |
20120170619 | METHOD FOR SENDING AND RECEIVING DATA ON A COOPERATIVE COMMUNICATIONS SYSTEM AND A COOPERATIVE COMMUNICATIONS METHOD - A data transmission method of a source node in a cooperative communication system includes: performing a beamforming to a relay node; transmitting data to the relay node; performing a beamforming to a destination node; and transmitting data to the destination node. | 07-05-2012 |
20120182836 | COMMUNICATION SYSTEM USING ULTRASONIC WAVES - Disclosed is a technology for performing a communication using an ultrasonic wave in an environment where an electromagnetic shielding is so severe that a wireless communication using an electromagnetic is difficult. In the environment where the electromagnetic shielding is severe, an ultrasonic terminal according to the present invention may transmit the ultrasonic wave using a solid structure as a medium, and an ultrasonic base station may receive the ultrasonic wave using the solid structure as the medium. | 07-19-2012 |
20120207080 | SYNCHRONIZATION CONTROL METHOD FOR DATA TRANSMISSION/RECEPTION, AND STATION FOR DATA TRANSMISSION/RECEPTION SYNCHRONIZATION - Disclosed is a technique related to a method for controlling synchronization by correcting data transmission time or frequency offset, and to a station. According to the technique, a method for controlling the synchronization of a first terminal for data transmission/reception in a coordinated communication system comprises: a step of transmitting a first request frame and a second request frame containing transmission time information for each of a first response frame and a second response frame to a second terminal and to a third terminal, respectively; a step of receiving the first response frame and the second response frame from the second terminal and the third terminal; a step of estimating a first propagation delay time between the first terminal and the second terminal and a second propagation delay time between the first terminal and the third terminal, using the time of receiving the first response frame and the second response frame; and a step of transmitting, to the second terminal, a third request frame containing information on the delay time difference between the first propagation delay time and the second propagation delay time. | 08-16-2012 |
20120207146 | METHOD AND APPARATUS FOR ADJUSTING SIGNAL TRANSMISSION STARTING POINT OF TERMINAL IN WIRELESS NETWORK - Disclosed is a method for adjusting a transmission time point of at least one second terminal in a wireless network by a first terminal. In the method for adjusting a transmission time point of a terminal, a transmission time point of the second terminal is set, a first frame including information regarding the transmission time point is transmitted to the second terminal, a first response frame transmitted according to the transmission time point from the second terminal is received, and the transmission time point is adjusted according to an arrival time of the first response frame. | 08-16-2012 |
20120213177 | POWER SAVING METHOD IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus of accessing a channel in a wireless local area network is provided. A destination station receives a request to send (RTS) frame to allocate a network allocation vector from a source station over a first bandwidth and transmits a clear to send (CTS) frame over a second bandwidth to the source station in response to the RTS frame. The second bandwidth is dynamically determined when a first parameter has a predetermined value. | 08-23-2012 |
20120219077 | METHOD AND APPARATUS FOR GENERATING/TRANSMITTING A FRAME FOR WIRELESS COMMUNICATION, AND SYNCHRONIZATION ESTIMATION METHOD FOR WIRELESS COMMUNICATION - Disclosed is a technique related to a method and apparatus for generating a preamble and a data frame for wireless communication, and to a synchronization estimation method using the preamble. According to the technique, a method for generating a frame for wireless communication is disclosed, wherein the method comprises: a step of generating a modified sequence using a first base sequence for synchronization estimation; and a step of allocating the first base sequence and the modified sequence to the frequency domain of a first timeslot to generate a preamble. The modified sequence includes a complex conjugated sequence of the first base sequence or a sequence having a code different from that of the first base sequence. | 08-30-2012 |
20120314609 | WIRELESS COMMUNICATION METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING FRAME THROUGH RELAY - The present invention provides a wireless communication method used for transmitting and receiving a relay in a wireless local area network system. The wireless local area network system according to an embodiment of the present invention relates to a wireless communication method of setting a relay link through a relay and setting a transmission time point at which a data frame is transmitted in a source device by recognizing a propagation delay between devices, and the like when an operation mode of the set relay corresponds to a cooperating mode. | 12-13-2012 |
20120320864 | METHOD AND APPARATUS FOR ALLOCATING SEQUENCE TO SYNCHRONIZATION CHANNEL FOR NODE IDENTIFICATION IN WIRELESS COMMUNICATION SYSTEM - Provided is an apparatus for allocating a sequence to a synchronization channel for a node identification (ID), the apparatus including: a base node sequence generator to generate a base sequence that is a sequence for a node ID of a base node; a relay node sequence generator to generate a relay sequence that is a sequence for a node ID of a relay node by transforming the base sequence; a baseband signal generator to generate a baseband signal by mapping the base sequence or the relay sequence to a frequency domain and a time domain; and a transmitter to transmit the baseband signal. | 12-20-2012 |
20130003689 | METHOD AND APPARATUS FOR ALLOCATING RESERVATION RESOURCE FOR RELAY IN WIRELESS COMMUNICATION SYSTEM USING MEDIA ACCESS CONTROL BASED ON RESERVATION - Provided is a communication method of a coordinator in a wireless networks system that uses a reservation-based media access control (MAC). The communication method includes receiving, from a source device, a frame that requests a reservation resource for a relay device, to enable a frame that the source device transmits to a destination device to be relayed via the relay device, and allocating the reservation resource for the relay device, in response to the request. | 01-03-2013 |
20130034045 | COMMUNICATION METHOD FOR A COORDINATOR, A RELAY DEVICE, A SOURCE DEVICE AND A DESTINATION DEVICE INCLUDED IN A WIRELESS NETWORK - Provided is a communication method of a coordinator, the method including: receiving a relay search request frame for requesting a search for at least one relay station between a destination station and a source station; and transmitting, in response to the relay search request frame, a relay search response frame including a list of the at least one relay station so that the source station selects a target relay station from the at least one relay station. | 02-07-2013 |
20130039201 | COMMUNICATION METHOD AMONG A SOURCE DEVICE, A DESTINATION DEVICE AND A RELAY DEVICE - A communication method of a source device according to an embodiment includes detecting a status of a first link directly connected from the source device to a destination device or a status of a second link connected from the source device to the destination device via a relay device, selecting any one of the first link and the second link based on a result of the detection, and transmitting data using the selected link. | 02-14-2013 |
20130102244 | MACHINE TYPE COMMUNICATION GATEWAY USER EQUIPMENT AND MACHINE TYPE COMMUNICATION DATA RELAY METHOD OF THE SAME - Provided are machine type communication (MTC) gateway user equipment (MGUE) and an MTC data relay method of the same. The MGUE includes a first radio matching unit configured to process a signal having a first frequency band characteristic and provide radio access matching with a base station, a second radio matching unit configured to process a signal having a second frequency band characteristic and provide radio access matching with at least one MTC device, a radio access switching processor configured to convert data respectively output by the first radio matching unit and the second radio matching unit and provide the converted data, and a controller configured to find an identifier of at least one MTC device related to MTC control information received from the first radio matching unit and control the second radio matching unit to transmit the MTC control information to the MTC device. | 04-25-2013 |
20130147538 | DIGITAL PRE-DISTORTION DEVICE AND PRE-DISTORTION METHOD THEREOF - Disclosed is a digital pre-distortion device which includes a pre-compensation lookup table which outputs a first input value and a second input value adjacent to an input signal, a first distortion value corresponding to the first input value, and a second distortion value corresponding to the second input value; and a function generator which generates a pre-distortion function based on the first and second input values and the first and second distortion values and generates a pre-distortion value corresponding to the input signal from the pre-distortion function. | 06-13-2013 |
20130163468 | WIRELESS DEVICE AND METHOD FOR SEARCHING FOR NEIGHBORHOOD DEVICE - Provided is a wireless device and method for searching for a neighboring device in which the wireless device may spread a probe request message for searching for neighboring wireless devices using a predetermined spreading code, and broadcast the spread probe request message, and may receive and thereby de-spread a wireless signal and verify whether a neighboring wireless device is present using a probe response message when the probe response message is included in the de-spread wireless signal. | 06-27-2013 |
20130163488 | RADIO-FREQUENCY TRANSCEIVING FRONT-END APPARATUS USING PASSIVE ELEMENTS IN WIRELESS COMMUNICATION SYSTEM - Disclosed is a radio-frequency front-end apparatus that can be used in wireless communication systems performing transmission/reception by using a single antenna. The radio-frequency transceiving front-end apparatus using passive elements in a wireless communication system includes: a transmitting unit's hybrid coupler configured to divide and output a transmission signal into two outputs having a phase difference of 90°; a first circulator configured to receive a first output of the hybrid coupler through a first terminal thereof and output the received first output through a second terminal thereof; a second circulator configured to receive a second output of the hybrid coupler through a first terminal thereof and output the received second output through a second terminal thereof; and an output unit's hybrid coupler configured to receive transmission signals from the second terminal of the first circulator and the second terminal of the second circulator, and combine and output the received signals. | 06-27-2013 |
20130176926 | POWER SAVING METHOD IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus of accessing a channel in a wireless local area network is provided. A destination station receives a request to send (RTS) frame to allocate a network allocation vector from a source station over a first bandwidth and transmits a clear to send (CTS) frame over a second bandwidth to the source station in response to the RTS frame. The second bandwidth is dynamically determined when a first parameter has a predetermined value. | 07-11-2013 |
20130208712 | DISASTER PREVENTION SYSTEM BASED ON WIRELESS LOCAL AREA NETWORK AND METHOD FOR THE SAME - A method of operating a disaster prevention system by a disaster prevention center is provided. The method includes: receiving a disaster situation generation report message including disaster information from a user equipment via an access point (AP); generating disaster response information based on the disaster information; and transmitting a disaster broadcasting message including the disaster response information to the disaster prevention center through the AP. | 08-15-2013 |
20130223554 | SPATIAL MULTIPLEXING COMMUNICATION SYSTEM AND METHOD - Provided is a communication system for transmitting data using a plurality of interference-free communication channels. A transmission apparatus may inactivate a portion from among a plurality of transmit antennas and thereby group transmit antennas into a plurality of antenna groups. A channel formed between each antenna group and a reception apparatus may have a relatively low correlation and thus, the may be assumed to be independent. Accordingly, the transmission apparatus and the reception apparatus may transmit data using separate interference-free communication channels. | 08-29-2013 |
20130258937 | PACKET TRANSMISSION/RECEPTION METHOD AND APPARATUS IN WIRELESS COMMUNICATION SYSTEM - A method for simultaneously transmitting packets to one or more users in a wireless communication system includes: generating the packets which include length information and are to be transmitted to the one or more users; and simultaneously transmitting the generated packets to the one or more users. The length information includes information representing a unit of the length information and information representing lengths of the packets according to the unit. | 10-03-2013 |
20130308657 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING MULTIPLE CODEWORDS IN SC-FDMA SYSTEM - The present invention relates a method and apparatus for transmitting/receiving data using multiple codewords in a communication system using SC-FDMA (single carrier frequency division multiple access). A transmitter generates the multiple codewords for user data and transmits the generated multiple codewords. A receiver receives the multiple codewords and sequentially performs decoding and SIC (successive interference cancellation) on the received multiple codewords. Therefore, this structure can minimize a PAPR (peak to average power ratio) and considerably reduces interference between symbols in a frequency selective fading environment. | 11-21-2013 |
20140004895 | DATA TRANSMITTING METHOD FOR MACHINE TYPE COMMUNICATION (MTC) SERVICE AND COMMUNICATION APPARATUS USING THE SAME | 01-02-2014 |
20140235172 | METHOD AND SYSTEM FOR COMMUNICATING BETWEEN DEVICES - A method and system for communicating between devices according to the present invention are provided. The method for communicating between the devices according to the present invention is used for communicating with a first terminal, and is carried out in a device having a capacitive touch screen. The method includes: detecting a change in capacitance for a specific part of the capacitive touch screen, which occurs by means of the first terminal; and acquiring information transferred from the first terminal on the basis of the detected change in capacitance of the capacitive touch screen. The communicating method using such a touch screen may be easily used for various services such as authenticating terminals or transferring files between local terminals. | 08-21-2014 |
20140241238 | METHOD AND APPARATUS FOR ALLOCATING SEQUENCE TO SYNCHRONIZATION CHANNEL FOR NODE IDENTIFICATION IN WIRELESS COMMUNICATION SYSTEM - Provided is an apparatus for allocating a sequence to a synchronization channel for a node identification (ID), the apparatus including: a base node sequence generator to generate a base sequence that is a sequence for a node ID of a base node; a relay node sequence generator to generate a relay sequence that is a sequence for a node ID of a relay node by transforming the base sequence; a baseband signal generator to generate a baseband signal by mapping the base sequence or the relay sequence to a frequency domain and a time domain; and a transmitter to transmit the baseband signal. | 08-28-2014 |
20140314019 | METHOD AND APPARATUS FOR CONTENTION-BASED CHANNEL ACCESS WITH DIRECTIONAL ANTENNA OVER WIDEBAND HIGH FREQUENCY WIRELESS SYSTEM - Provided are a method of performing contention based channel access by classifying a contention period into a beamformable contention period in which a beamforming is allowed and a non-beamformable contention period in which the beamforming is interrupted so as to resolve an issue regarding channel access occurring due to an introduction of a directional antenna for handling a path loss in a wideband wireless communication system according to an embodiment of the present invention, and a method for maximizing a spatial reuse gain by managing, for each direction, information about a transmission time of a message received from a dispersion device. | 10-23-2014 |
20140355510 | METHOD AND APPARATUS FOR ADJUSTING SIGNAL TRANSMISSION STARTING POINT OF TERMINAL IN WIRELESS NETWORK - Disclosed is a method for adjusting a transmission time point of at least one second terminal in a wireless network by a first terminal. In the method for adjusting a transmission time point of a terminal, a transmission time point of the second terminal is set, a first frame including information regarding the transmission time point is transmitted to the second terminal, a first response frame transmitted according to the transmission time point from the second terminal is received, and the transmission time point is adjusted according to an arrival time of the first response frame. | 12-04-2014 |
20140362715 | APPARATUS AND METHOD FOR BROADBAND WIRELESS LOCAL AREA COMMUNICATION - Provided is an apparatus and method for wideband short-range wireless communication using a directional antenna in a millimeter wave band, and the method for wideband short-range wireless communication according to an embodiment may determine a first time interval and a second time interval for a cooperated data frame transfer based on a packet transmission time at each transmission from a source node to a destination node, transmit a frame to a relay node through an antenna pattern directed towards the relay node at a start point of the first time interval, and transmit the frame to the destination node through an antenna pattern directed towards the destination node after a predetermined period of time from a start point of the second time interval. | 12-11-2014 |
20140370802 | WIRELESS COMMUNICATION METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING FRAME THROUGH RELAY - The present invention provides a wireless communication method used for transmitting and receiving a relay in a wireless local area network system. The wireless local area network system according to an embodiment of the present invention relates to a wireless communication method of setting a relay link through a relay and setting a transmission time point at which a data frame is transmitted in a source device by recognizing a propagation delay between devices, and the like when an operation mode of the set relay corresponds to a cooperating mode. | 12-18-2014 |
20150078193 | COMMUNICATION METHOD FOR SOURCE DEVICE, DESTINATION DEVICE AND RELAY DEVICE - A communication method of a source device according to an embodiment includes detecting a status of a first link directly connected from the source device to a destination device or a status of a second link connected from the source device to the destination device via a relay device, selecting any one of the first link and the second link based on a result of the detection, and transmitting data using the selected link. | 03-19-2015 |