Patent application number | Description | Published |
20120163314 | METHOD AND APPARATUS OF SENDING FRAMES IN COGNITIVE RADIO SYSTEM - The present invention provides a method of a node sending frames in a Cognitive Radio (CR) system. The method of the node includes being allocated a first channel as an operating channel where the node will be operated, sensing one or more candidate channels available as the operating channel of the node, determining whether to extend a frequency bandwidth of the operating channel, in addition to the first channel, based on a result of the sense for the one or more candidate channels, and sending the frames using a frequency bandwidth extended by adding a second channel, newly determined as the operating channel, to the first channel according to the determination. | 06-28-2012 |
20120163367 | APPARATUS AND METHOD FOR ACQUIRING SYNCHRONIZATION IN WIRELESS COMMUNICATION SYSTEM - An apparatus for acquiring synchronization using a signal having repetition patterns is provided. The apparatus includes: a signal reception unit for receiving signal streams transmitted in the repetition patterns, a synchronization point tracking unit for calculating, during one period in which the signal streams are repeated in the repetition patterns, an add-sum of the signal streams, a sub-sum of the signal streams and an add-sub-sum which is a difference between the add-sum and the sub-sum, and for tracking an estimated synchronization point by comparing the sub-sum and the add-sub-sum, and a synchronization acquisition unit for acquiring, based on the estimated synchronization point, a synchronization point by searching for a point where the repetition of some of the signal streams is ended or a point where new signal streams having different characteristics from the signal streams are started. | 06-28-2012 |
20120163505 | METHOD AND APPARATUS OF SIGNAL DETECTION IN WIRELESS LOCAL AREA NETWORK SYSTEM - Disclosed is a method and receiver for detecting a wireless signal in a wireless local area network (WLAN) system. The receiver includes a radio frequency (RF) unit which receives a wireless signal; an analog/digital converter (ADC) which converts the wireless signal into a digital signal; a fast Fourier transform (FFT) unit which applies FFT to the digital signal; a multiple inputs and multiple outputs (MIMO) detector which performs channel compensation for the FFT applying result; a constellation-demapping unit which constellation-demaps with regard to the channel compensation result; a decoder which decodes the constellation-demapping result; and a high throughput (HT) detector which determines whether the wireless signal is a signal modulated with quadrature binary phase shift keying (Q-BPSK) constellation obtained by rotating binary phase shift keying (BPSK) constellation at an angle of 90 degrees on the basis of the FFT applying result. | 06-28-2012 |
20120164957 | APPARATUS AND METHOD FOR ACQUIRING SYNCHRONIZATION IN WIRELESS COMMUNICATION SYSTEM - An apparatus for acquiring synchronization in a multi-channel system includes a signal reception unit for receiving information about repetition patterns of signal streams for each channel and receiving the signal streams and data from the channel, an estimated synchronization point tracking unit for determining a estimated synchronization point for the channel from a point of time where the repetition patterns are ended by tracking a period where the signal streams are repeated based on the repetition patterns, and a synchronization acquisition unit for searching, based on the estimated synchronization point related to the channel, for a point where the repetition of the signal stream is ended or a point where new signal streams are started and acquiring a synchronization point based on the point. | 06-28-2012 |
20120177144 | METHOD AND APPARATUS FOR TRANSMITTING SYMBOL REPEATEDLY IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for a transmitter to transmit data in a wireless communication system are provided. This method includes: generating a first signal field including at least one symbol; generating a second signal field configured by repeating at least one symbol of the first signal field; and transmitting a frame including the first signal field, the second signal field, and a data field and a first symbol of the second signal field is modulated through binary phase shift keying (BPSK) and symbols from a second symbol of the second signal field are modulated through Q-BPSK. According to the present invention, a service filed can be extended while maintaining compatibility with a wireless communication system in the related art by transmitting a frame using symbol repetition. | 07-12-2012 |
20120182926 | METHOD AND APPARATUS FOR TRANSMITTING RELAY FRAME IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting a relay frame in a relay end are provided. The method includes: receiving a relay request frame requesting data transmission to a receive end from a transmit end; transmitting a relay response frame including information on data to be relayed to each of the transmit end and the receive end; receiving the data from the transmit end; and generating a relay frame including the data to transmit the relay frame to the receive end. According to the present invention, the data is transmitted to the receive end positioned outside a transmission coverage of the transmit end, such that a wireless LAN service coverage may be expanded, and an adjacent terminal connected to the receive end is used as the relay end, such that the transmit end that may not be connected directly to the receive end may communicate with the receive end. | 07-19-2012 |
20120207140 | METHOD FOR GENERATING AND TRANSMITTING FRAME IN A WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR SUPPORTING THE SAME - A channel sounding method in a wireless local area network (WLAN) system is provided. The method, performed by a transmitter, includes transmitting a null data packet announcement (NDPA) frame to a receiver to initiate a channel sounding procedure; transmitting a null data packet (NDP) to the receiver and receiving a feedback frame. The feedback frame includes a plurality of segment frames and a channel feedback report. The channel feedback report is split into a plurality of feedback segments. Each of the plurality of feedback segments is respectively included in each of the plurality of segment frames. The each of the plurality of segment frames includes a first-segment subfield indicating whether the each of the plurality of feedback segment included is a first segment and a remaining-segment subfield indicating the number of remaining feedback segments. | 08-16-2012 |
20120294170 | METHOD FOR TRANSMITTING FRAME WITH INTERFERENCE AVOIDANCE IN WIRELESS LOCAL AREA NETWORK SYSTEM AND APPRATUS FOR THE SAME - A method for transmitting a frame in a wireless local area network system is provided. The method includes obtaining, by a station (STA), interference channel information of an interference channel between the STA and neighbor STA that is a frame transmission object of an access point (AP); determining, by the STA, a transmitting beam vector based on the interference channel information; and transmitting, by the STA, a data frame to a transmission target STA using a multiple input multiple output (MIMO) transmission based on the transmitting beam vector. | 11-22-2012 |