Patent application number | Description | Published |
20100189200 | DECODING DEVICE AND METHOD FOR MIMO SYSTEM - The present invention relates to a decoding device and method for a MIMO system. A linear process is applied to a received signal vector by using a channel matrix estimated from the received signal vector and a poly-diagonalized matrix, and a soft decision value is acquired through a trellis decode by using the linear process result. Since the linear preprocess is performed by using the poly-diagonalized matrix, it is possible to receive a MIMO signal having good packet error rate performance and less complexity. Also, since the tail-biting trellis decoding method is used based on the poly-diagonalized matrix that is generated by poly-diagonalizing the effective channel matrix during the process for eliminating the signal interference, the soft decision value for the symbol can be generated with a simple hardwired device and less operation complexity. | 07-29-2010 |
20110096685 | PACKET MODE AUTO-DETECTION IN MULTI-MODE WIRELESS COMMUNICATION SYSTEM, SIGNAL FIELD TRANSMISSION FOR THE PACKET MODE AUTO-DETECTION, AND GAIN CONTROL BASED ON THE PACKET MODE - A method for automatically detecting a packet mode in a wireless communication system supporting a multiple transmission mode includes: acquiring at least one of data rate information, packet length information and channel bandwidth information from a transmitted frame; and determining the packet mode on the basis of the phase rotation check result of a symbol transmitted after a signal field signal and at least one of the data rate information, the packet length information and the channel bandwidth information acquired from the transmitted frame. | 04-28-2011 |
20110149766 | ASSOCIATION SUPPORTING APPARATUS AND METHOD IN WIRELESS COMMUNICATION SYSTEM - An association supporting apparatus in a wireless communication system includes: a transmission/reception unit configured to scan associable access points (APs) among a plurality of APs existing in a plurality of station (STA) wireless networks, and receive state information from the scanned APs; a calculation unit configured to calculate transmit opportunity (TXOP) periods with respect to the APs by using the received state information of the APs; and a determination unit configured to determine a predetermined AP among the plurality of scanned APs, considering usable power levels of the APs and the number of associable STAs during the calculated TXOP periods. | 06-23-2011 |
20110150148 | APPARATUS AND METHOD FOR DETECTING SIGNAL IN WIRELESS COMMUNICATION SYSTEM - The apparatus includes a radio frequency (RF) unit configured to arrange a plurality of symbols received through an antenna at a frequency domain, an analog to digital (AD) converter configured to converts the plurality of symbols arranged at the frequency domain to digital symbols, a fast Fourier transform (FFT) unit configured to transform the digital symbols through a fast Fourier transform scheme, a compensator configured to compensate a gain mismatch between an I-channel and a Q-channel of the transformed digital symbols, a mapping unit configured to the compensated digital symbols to a constellation diagram, and a detector configured to correlate the mapped symbols, extract correlation results, and detect a high throughput (HT) signal using the extracted correlation results. | 06-23-2011 |
20110150149 | APPARATUS AND METHOD FOR DETECTING PACKET END POINT IN WIRELESS COMMUNICATION SYSTEM - An apparatus for detecting a packet end point in a wireless communication system includes: a signal reception unit configured to receive a signal from an outside, convert the signal into a baseband signal, perform analog-digital conversion of the baseband signal, and perform a digital front end; a storage unit configured to store an output of the signal reception unit; a frequency offset estimation unit configured to estimate a frequency offset using the output of the storage unit; a frequency offset correction unit configured to compensate for a frequency error using the estimated frequency offset; an offset correlation unit configured to calculate correlation of the frequency offset and a cyclic prefix; an auto-correlation operation unit configured to calculate auto-correlation of the cyclic prefix; and a packet end detection unit configured to check a packet end point using the auto-correlation. | 06-23-2011 |
20110206156 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING DATA IN WIRELESS COMMUNICATION SYSTEM - A method for transmitting, by a transmitting terminal, data to a receiving terminal in a wireless communication system includes: generating a first detection field including symbols modulated by using a BPSK data tone; generating a second detection field including symbols modulated such that an even numbered subcarrier and an odd numbered subcarrier have a phase difference of 90 degrees; generating a data packet including the first detection field, the second detection field, and the data; and transmitting the data packet. | 08-25-2011 |
20140036829 | PACKET MODE AUTO-DETECTION IN MULTI-MODE WIRELESS COMMUNICATION SYSTEM, SIGNAL FIELD TRANSMISSION FOR THE PACKET MODE AUTO-DETECTION, AND GAIN CONTROL BASED ON THE PACKET MODE - A method for automatically detecting a packet mode in a wireless communication system supporting a multiple transmission mode includes: acquiring at least one of data rate information, packet length information and channel bandwidth information from a transmitted frame; and determining the packet mode on the basis of the phase rotation check result of a symbol transmitted after a signal field signal and at least one of the data rate information, the packet length information and the channel bandwidth information acquired from the transmitted frame. | 02-06-2014 |
20140073337 | COMMUNICATION DEVICE AND COMMUNICATION METHOD USING MILLIMETER-WAVE FREQUENCY BAND - There are provided a communication device using a millimeter-wave frequency band and a communication method using the millimeter-wave frequency band. The communication device includes a beam scheduling unit configured to schedule uplink and downlink beams corresponding to movement of a terminal, a core network interface unit configured to transmit data provided from the beam scheduling unit to a core network, and to provide data received from the core network to the beam scheduling unit, a mobility management unit configured to configure an uplink and downlink beam set based on inter-beam interference information provided from the beam scheduling unit, and an inter-base station interface unit configured to exchange a control message with another base station under control of the mobility management unit. Therefore, it is possible to efficiently build a cellular network using the millimeter-wave frequency band. | 03-13-2014 |
20140161059 | METHOD FOR TRANSMITTING AND RECEIVING DATA IN COMMUNICATION SYSTEM USING MULTIPLE ANTENNAS AND APPARATUS THEREFOR - There are provided a method for transmitting and receiving data in communication system using multiple antennas and an apparatus for the same. The method of transmitting data in a base station may comprise receiving information on at least one beam causing interferences from a served terminal and transmitting control information to be used for cancelling interferences caused by the at least one beam to the served terminal. Thus, according to the present invention, interference may be controlled effectively in a communication system using multiple antennas. | 06-12-2014 |
20140162655 | ANTENNA APPARATUS AND METHOD FOR HANDOVER USING THE SAME - There are provided an antenna apparatus and a method of handover using the antenna apparatus. The antenna apparatus may comprise a plurality of antenna elements forming a plurality of beams in a predetermined service area. The plurality of antenna elements are arranged in a plurality of rows, and a number of antenna elements included in an uppermost row of the plurality of rows is smaller than a number of antenna elements included in a downmost row of the plurality of rows, and differences between center angles of beams formed by the antenna elements included in the downmost row are larger than differences between center angles of beams formed by the antenna elements included in the uppermost row. | 06-12-2014 |
20140162704 | METHOD OF DETERMINING POSITION OF TERMINAL IN COMMUNICATION SYSTEM USING MULTIPLE BEAMS - A method of determining a position of a terminal in a communication system using multiple beams is provided. The method includes receiving a first beam from a first point, receiving a second beam from a second point, and determining a position of the terminal by use of information about the first beam and information about the second beam, so that in a case in which two or more effective beams are received in a system using multiple beams, the position of the terminal is determined by use of the angle of a beam, and information about coordinates of departure of a beam and/or coordinates of final arrival of a beam without using a positioning device, such as GPS. | 06-12-2014 |