Patent application number | Description | Published |
20090016309 | APPARATUS AND METHOD FOR ULTRA WIDE BAND COMMUNICATION BASED ON MULTI-CODED BI-ORTHOGONAL PULSE POSITION MODULATION - Provided is a communication system for ultra wide band impulse communication, and more particularly, to a communication apparatus and method that can be used in a sensor network or a low-rate wireless personal area network. To be more specific, the present research suggests a transmitter employing multi-coded bi-orthogonal pulse position modulation/demodulation and a method thereof. The transmitter of the present research provides: a serial-to-parallel converter for convening L-bit serial data to be transmitted into parallel data by performing grouping on the L-bit serial data; a multi-coder for generating a multi-coded symbol by multiplying the parallel data by total L orthogonal codes of length N | 01-15-2009 |
20090067389 | RADIO COMMUNICATION SYSTEM, RADIO COMMUNICATION APPARATUS AND RADIO COMMUNICATION METHOD FOR UWB IMPULSE COMMUNICATION - Provided is a radio communication system for ultra wideband (UWB) impulse communications and a radio communication apparatus and method thereof. The present patent provides a radio communication system that can minimize power consumption by eliminating a need for carrier detection and sharing transmission/reception time information in UWB impulse communications. The system includes a network coordinator; and one or more devices communicating on a superframe basis in subordination to the network coordinator. The devices perform data transmission/reception in predetermined time slots and then they are inactivated to thereby reduce power consumption. | 03-12-2009 |
20090245396 | ORTHOGONAL RESOURCE BLOCK HOPPING MULTIPLEXING METHOD AND APPARATUS - The present invention relates to an orthogonal resource block hopping multiplexing(ORBHM) method and apparatus in a wired/wireless communication system in which a plurality of communication channels coexist in a single medium. | 10-01-2009 |
20100103835 | SCHEDULER AND SCHEDULING METHOD FOR TRANSMITTING DATA IN MIMO BASED WIRELESS LAN SYSTEM - A scheduler and scheduling method that may select a data transmission time interval and a data transmitting station are included in a multi-user Multiple Input Multiple Output (MIMO) communication system. An access point may include a receiver to receive channel measurement signals from stations using a plurality of receive antennas; a channel estimation unit to generate channel state matrices with respect to wireless channels formed from the stations to the receive antennas using the channel measurement signals; and a scheduler to select at least one transmitting station from the stations by considering the channel state matrices and a number of the receive antennas. The receiver may receive a data stream from the selected transmitting stations. Stations receive identifiers corresponding to transmitting stations and/or transmitting antennas to identify stations or antennas for transmitting data streams to the access point. | 04-29-2010 |
20100103913 | APPARATUS AND METHOD FOR DETERMINING CONTENTION WINDOW SIZE IN MULTI USER MIMO BASED WIRELESS LAN SYSTEM - A Multiple-Input Multiple-Output data transmission system includes access stations and an access point having multiple receive antennas. An access point has a minimum contention window size decision unit to determine a minimum contention window size based on the number of receive antennas and a number of access stations, a broadcasting unit to broadcast the determined minimum contention window size to the access stations, and a receiver to receive data from the access stations in a contention window that is calculated based on the minimum contention window size. An access station receives the minimum contention window size from the access point, determines a first contention window size based on the minimum contention window size, and transmits data to the access point within the first contention window. If the transmission fails, the access station determines a second contention window size and retransmits the data in the second contention window. | 04-29-2010 |
20100165952 | ORTHOGONAL FREQUENCY AND CODE HOPPING MULTIPLEXING COMMUNICATIONS METHOD - An Orthogonal Frequency and Code Hopping Multiplexing (OFCHM) communication method based Orthogonal Frequency Division Multiplexing (OFDM) in a wireless communication system in which a plurality of communication channels are synchronized through a single medium. Six types of spreading and hopping methods are included, a method of controlling spreading and hopping depending on channel states, and a method of determining whether radio resources, consisting of subcarriers and orthogonal codewords, are allocated in a hopping manner according to the quality of service in the OFCHM communication method based OFDM. Furthermore, an embodiment employing six multiple array antennas is included. For this purpose, a method of combining a collision comparator and controller for monitoring the operations of a subcarrier group hopping pattern generator and an orthogonal code hopping pattern generator, a multiplexer and data symbol mapper, and the collision of hopping patterns that are composed of subcarriers and orthogonal codewords, and comparing data symbols to be transmitted to second communication stations to determine whether the data symbols collide in a symbol interval, a beam-forming processor for managing the operation of multiple array antennas, and a weighting vector controller is proposed. | 07-01-2010 |
20100246546 | METHOD OF SELECTING ANTENNAS AND TRANSMITTING DATA IN MULTI-INPUT MULTI-OUTPUT WIRELESS LOCAL AREA NETWORK ENVIRONMENTS - In a Multiple-Input Multiple-Output (MIMO) wireless local area network (WLAN) system, a method is provided for selecting at least one antenna from a plurality of antennas and transmitting a data frame from a station to an access point via the selected antenna or antennas. A method for transmitting data from a plurality of stations to an access point in the MIMO WLAN system includes detecting a channel status of a channel from the access point to each transmitting antenna of the station, selecting at least one transmitting antenna from among the station's transmitting antennas based on the detected channel status, and transmitting a data frame from the station to the access point via the selected transmitting antenna or antennas. | 09-30-2010 |
20100322080 | METHOD OF TRANSMITTING DATA SUPPORTING MULTIPLE ACCESS - There is provided a method in which a second communication station located within a cell region provided by a first communication station transmits data. The method includes generating a hopping pattern between a plurality of orthogonal resources by arranging the plurality of orthogonal resources according to time, generating a transmission signal by mapping a data symbol to orthogonal resources, which are included in the hopping pattern and allocated to a specific timeslot and transmitting the transmission signal to the first communication station. Capacity for supporting multiple access can increased by effectively utilizing limited wireless communication resources. | 12-23-2010 |
20110116410 | METHOD FOR CONTROLLING INTER-CELL INTERFERENCE IN A MOBILE COMMUNICATION SYSTEM - A method for controlling inter-cell interference (ICI) in a mobile communication system by transmitting uplink control information from a base station in a home cell to a terminal of a neighboring cell based on ICI amount information measured at the base station. The ICI control method includes receiving an uplink signal at a base station and extracting inter-cell interference amount information from the uplink signal, generating uplink control information based on the extracted inter-cell interference amount information, and transmitting the uplink control information to a terminal in a neighboring cell. The terminal schedules an uplink resource including selecting frequency bands for an uplink signal by referring to the uplink control information. | 05-19-2011 |
20120099619 | METHOD FOR INTERFERENCE CONTROL BY AN ULTRA-WIDEBAND WIRELESS COMMUNICATION SYSTEM IN A MULTI-USER ENVIRONMENT AND A RECEIVER FOR PERFORMING THE SAME - An Ultra-Wideband (UWB) wireless communication system in a multi-user environment determines a threshold value to eliminate a signal pulse affected by a near-interference from among a plurality of signal pulses transmitted a number of times. A method for controlling an interference includes receiving the signal pulses, calculating a correlation value by applying a predetermined correlation mask to the signal pulses, determining a threshold value by referring to the number of times that the signal pulses are transmitted, a signal-to-interference-and-noise ratio, and information about a ratio of a near-interference to a far-interference, and eliminating signal pulses having a correlation value greater than the threshold value. The correlation values that are not greater than the threshold value are summed to detect a bit corresponding to each pulse signal. | 04-26-2012 |
20120163228 | METHOD FOR INTER-CELL INTERFERENCE MITIGATION FOR A MOBILE COMMUNICATION SYSTEM - A method for reducing inter-cell interference (ICI) in a mobile communication system controls transmission signal power of an uplink signal from a terminal based on signal power measurement for a signal received from a base station of a neighboring cell. A terminal receives a signal from a base station of a neighboring cell via a wireless channel, measures a channel response against a threshold value across an applicable frequency band by using the received signal, determines a transmission signal power for each frequency band used for data transmission based on the measured channel response, and transmits data to a home cell base station according to the transmission signal power for each frequency band. The terminal may measure a channel response based on signals received from multiple base stations in multiple neighboring cells, and may also evaluate signal power of a signal transmitted from the home cell. | 06-28-2012 |
20120320898 | METHOD OF SELECTING ANTENNAS AND TRANSMITTING DATA IN MULTI-INPUT MULTI-OUTPUT WIRELESS LOCAL AREA NETWORK ENVIRONMENTS - In a Multiple-Input Multiple-Output (MIMO) wireless local area network (WLAN) system, a method is provided for selecting at least one antenna from a plurality of antennas and transmitting a data frame from a station to an access point via the selected antenna or antennas. A method for transmitting data from a plurality of stations to an access point in the MIMO WLAN system includes detecting a channel status of a channel from the access point to each transmitting antenna of the station, selecting at least one transmitting antenna from among the station's transmitting antennas based on the detected channel status, and transmitting a data frame from the station to the access point via the selected transmitting antenna or antennas. | 12-20-2012 |
20130225194 | METHOD FOR CONTROLLING INTER-CELL INTERFERENCE IN A MOBILE COMMUNICATION SYSTEM - A method for controlling inter-cell interference (ICI) in a mobile communication system by transmitting uplink control information from a base station in a home cell to a terminal of a neighboring cell based on ICI amount information measured at the base station. The ICI control method includes receiving an uplink signal at a base station and extracting inter-cell interference amount information from the uplink signal, generating uplink control information based on the extracted inter-cell interference amount information, and transmitting the uplink control information to a terminal in a neighboring cell. The terminal schedules an uplink resource including selecting frequency bands for an uplink signal by referring to the uplink control information. | 08-29-2013 |
20140125286 | METHOD FOR CONTROLLING THE CHARGING OF SEGMENTS FOR AN ONLINE ELECTRIC VEHICLE - A method for controlling the charging of segments for an online electric vehicle is described. In some situations, the method comprises: (a) receiving, from segments, information on the speed and position of the vehicle entering the range of the power-supplying device; and (b) controlling the charging/discharging timing of the current segment from which the vehicle is leaving and the next segment into the range of which the vehicle is to enter, in accordance with the information on the speed and position of the vehicle. The charging/discharging response delay characteristics of the segments may be considered. | 05-08-2014 |
20140161109 | SCHEDULER AND SCHEDULING METHOD FOR TRANSMITTING DATA IN MIMO BASED WIRELESS LAN SYSTEM - A scheduler and scheduling method that may select a data transmission time interval and a data transmitting station are included in a multi-user Multiple Input Multiple Output (MIMO) communication system. An access point may include a receiver to receive channel measurement signals from stations using a plurality of receive antennas; a channel estimation unit to generate channel state matrices with respect to wireless channels formed from the stations to the receive antennas using the channel measurement signals; and a scheduler to select at least one transmitting station from the stations by considering the channel state matrices and a number of the receive antennas. The receiver may receive a data stream from the selected transmitting stations. Stations receive identifiers corresponding to transmitting stations and/or transmitting antennas to identify stations or antennas for transmitting data streams to the access point. | 06-12-2014 |