Patent application number | Description | Published |
20080285673 | Apparatus and method for reducing peak to average power ratio based on tile structure in broadband wireless communication system - A broadband wireless communication system is provided. A transmitting end of the broadband wireless communication system includes: a controller for receiving a plurality of Orthogonal Frequency Division Multiple Access (OFDMA) symbols, and for generating the same number of symbol sets corresponding to the OFDMA symbols wherein each symbol set includes a plurality of OFDMA symbols having various Peak to Average Power Ratios (PAPRs) according to several phase-shifting patterns, a selector for grouping the plurality of OFDMA symbols into symbol groups according to the same phase-shifting pattern of the several phase-shifting patterns, and for finding maximum peak value in each symbol group, and a transmitter for transmitting the symbol group having a minimum value selected from among the maximum peak values of the symbol groups. | 11-20-2008 |
20090113271 | Method and apparatus for parallel structured latin square interleaving in communication system - A method and apparatus for parallel structured Latin square interleaving in a communication system are provided. The method includes dividing input information bits into sub-blocks according to a parallel processing order, generating a first Latin square matrix or a second Latin square matrix by comparing the parallel processing order with a predetermined threshold, and interleaving by reading out the information bits divided into the sub-blocks according to the generated Latin square matrix. | 04-30-2009 |
20090286546 | Apparatus and method for avoiding interference between base station and relay station when using full duplex relay in a multi hop relay system - An apparatus and method for avoiding interference between a base station and a relay station when using full duplex relay in a multi-hop relay wireless communication system are provided. An operation of a mobile station includes measuring an strength of a receive signal from a base station and an strength of a receive signal from an relay station, calculating a receive signal strength ratio of base station to relay station by dividing the strength of the receive signal from the base station by the strength of the receive signal from the relay station, determining if interference occurs using the receive signal strength ratio, and transmitting a control message representing if interference occurs. | 11-19-2009 |
20090290516 | Automatic gain control apparatus and method in a wireless communication system - An apparatus and method for adaptively adjusting a target Received Signal Strength Indicator (RSSI) for Automatic Gain Control (AGC) in a full-duplex relay apparatus with an interference cancellation function. A Signal to Interference Ratio (SIR) estimation block estimates an SIR based on an interference signal estimated from a received signal and an interference-cancelled signal determined by cancelling the estimated interference signal from the received signal. A target RSSI determination block determines a target RSSI according to the estimated SIR. An AGC block adjusts a gain for the received signal based on the determined target RSSI. | 11-26-2009 |
20100054162 | APPARATUS AND METHOD FOR FRAME GENERATION FOR A FULL DUPLEX RELAY - An apparatus and method for generating a frame in a communicating system supporting a full duplex relay. A controller configures a legacy zone and a new zone in a downlink section of the frame according to a TDM scheme, configures the new zone of the downlink section to include an access zone and a relay zone according to a TDM scheme, configures a legacy zone and a new zone in an uplink section of the frame according to the TDM scheme, and configures the new zone of the uplink section to include an access zone and a relay zone according to an FDM scheme. | 03-04-2010 |
20100142415 | APPARATUS AND METHOD FOR SCHEDULING IN A RELAY SYSTEM - An apparatus and a method for scheduling and a power control of a relay system that is capable of stable operation an environment where sufficient isolation between antennas is not ensured. The apparatus includes a scheduler for allocating resources to a zone not experiencing inter-antenna interference in an initial resource allocation, classifying users based on vulnerability to the interference, and allocating resources to a zone experiencing the interference, and a power controller for setting the resources of the zone experiencing the interference to a lower power than the resources of the zone not experiencing the interference to minimize the inter-antenna interference. | 06-10-2010 |
20100195543 | APPARATUS AND METHOD FOR INTERFERENCE CANCELLATION IN MOBILE FULL DUPLEX RELAY - A method and an apparatus for canceling an interference in a mobile Full Duplex Relay (FDR) are provided. A signal is received from a base station, interference canceling that uses a transmitter interference signal from which an original signal interference has been cancelled is repeatedly performed on the signal received from the base station, and an interference-cancelled signal is transmitted. | 08-05-2010 |
20100215009 | METHOD AND APPARATUS FOR RESOURCE ALLOCATION IN A MULTI HOP RELAY NETWORK - A method of resource allocation by a base station in a multi hop relay network includes identifying a number of relays participating in a cooperative communication; dividing a sub-frame resource interval of the relay according to the identified number of relays in a time domain; and allocating resources so that only two relays can communicate with each other in a divided resource zone, and transmitting data while performing multi-hopping between the relays, wherein only the two relays communicate with each other during the hopping. | 08-26-2010 |
20100271932 | APPARATUS AND METHOD FOR COMPENSATING FOR PHASE ERROR IN WIRELESS COMMUNICATION SYSTEM - An apparatus and method for compensating for a phase error in a wireless communication system are provided. The apparatus includes a reception modem, a transmission modem, a Common Phase Error (CPE) compensator, a first channel estimator, a phase compensator, and a second channel estimator. The reception modem demodulates and decodes a signal received. The transmission modem encodes and modulates a signal for transmission. The CPE compensator compensates for phase errors of at least two symbols constituting a signal. The first channel estimator estimates channels for respective bursts. The phase compensator compares phases for the channels for the respective bursts with each other and compensates for a phase difference between at least two bursts. The second channel estimator estimates an interference channel. | 10-28-2010 |
20120076158 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING DATA IN SINGLE CARRIER FREQUENCY DIVISION MULTIPLE ACCESS SYSTEM - The present invention provides a method for transmitting and receiving data in a single carrier frequency division multiple access system to which a precoding matrix is applied, and to a transmitting/receiving apparatus for same. The method for transmitting data comprises the steps of: applying selected mapping algorithm (SLM) sequences of an SLM sequence subset corresponding to a precoding matrix, to respective data; selecting the SLM sequence in which each of the applied data has the smallest peak to average power ratio (PAPR) value; and transmitting the index of the selected SLM sequence and data to which the selected SLM sequence is applied. The method for receiving data, to which a precoding matrix is applied, comprises the steps of: receiving the index of the SLM sequence selected from the SLM sequence subset corresponding to the precoding matrix, and data to which the selected SLM sequence is applied; and removing the SLM sequence from the data to which the SLM sequence is applied using the SLM sequence indicated by the index, in order to recover data. | 03-29-2012 |
20120295656 | METHOD AND APPARATUS FOR CONTROLLING POWER IN WIRELESS COMMUNICATION SYSTEM - A base station in a wireless communication system and a method for controlling power by the same are provided. The method includes receiving channel state information from a mobile terminal, calculating information regarding a Modulation order Product code Rate (MPR) of the mobile terminal using the channel state information, and controlling transmission power for the mobile terminal according to the information regarding the MPR. | 11-22-2012 |
20140335850 | METHOD AND APPARATUS FOR DETERMINING SERVING SUB-CELL IN WIRELESS COMMUNICATION SYSTEM INCLUDING MULTIPLE SUB-CELL - A method of determining a serving sub-cell of a terminal among a plurality of sub-cells by a base station in a wireless communication system is provided. The method includes generating reference signal transmission interval information for each of the sub-cells by configuring a reference signal transmission interval for each of the plurality of sub-cells, and transmitting the reference signal transmission interval information for each of the sub-cells to the corresponding sub-cell, receiving channel status information for at least one sub-cell among the plurality of sub-cells from the terminal, and determining a serving sub-cell of the terminal by using at least one of the reference signal transmission interval information, the channel status information, a reception time of the channel status information, of each of the sub-cells. | 11-13-2014 |