| Patent application number | Description | Published |
|---|
| 20080212696 | Radio-Communication Device and Radio-Communication Method - The disclosed invention determines whether a reception packet is an MM packet or a GF packet with precision and avoids unnecessary decoding operations performed at the GF-packet-reception time and inefficient communications. | 09-04-2008 |
| 20090196365 | Wireless Communication Apparatus, Antenna Calibration Method and Program - A wireless communication apparatus includes a loopback transfer function acquisition section that, when a first path including all paths from each branch of the first set to each branch of the second set via the antenna is formed, acquires a loopback transfer function of each path included in the first path based on a reception status of a reference signal transmitted from each branch of the first set and received by each branch of the second set, and when a second path opposite to the first path is formed, acquires a loopback transfer function of each path included in the second path based on a reception status of a reference signal transmitted from each branch of the second set and received by each branch of the first set, and a calibration factor calculation section to calculate a calibration factor of each branch based on the acquired loopback transfer functions. | 08-06-2009 |
| 20090219184 | Signal Processor, Control Method, and Wireless Communication Device - There is provided a signal processor with a plurality of antennas connected for transmitting and receiving wireless signals, including a plurality of analog reception processing units, AD converters, DA converters, and analog transmission processing units, wherein each of the analog reception processing units converts the wireless signal received through the antenna into an analog baseband signal and outputs the signal to the AD converter, each of the DA converters converts the digital baseband signal into analog format and outputs the signal, and each of the analog transmission processing units shifts the frequency band of the analog baseband signal output from the DA converter to the high frequency side. The signal processor further includes a transmission switch which switches among the DA converters respectively connected to the analog transmission processing units and a reception switch which switches among the AD converters respectively connected to the analog reception processing units. | 09-03-2009 |
| 20090305629 | Receiving Apparatus, Receiving Method and Wireless Communication System - There is provided a receiving apparatus including a plurality of antennas, a phase difference detection unit to detect a phase difference of each of a plurality of received signals received by the plurality of antennas, a phase adjustment unit to align phase of the plurality of received signals based on the phase difference detected by the phase difference detection unit, an adding unit to add the plurality of received signals with the phase aligned by the phase adjustment unit together, and a synchronous detection unit to perform synchronous detection using a signal obtained by addition in the adding unit. | 12-10-2009 |
| 20090323591 | Receiving Apparatus, Receiving Method and Wireless Communication System - A receiving apparatus is provided which includes a receiving unit to receive a radio signal, a transfer function estimation unit to estimate a transfer function of a communication path of the radio signal, and a cross-correlation calculation unit to calculate cross-correlation between a synchronous signal contained in a radio signal received by the receiving unit and a known synchronous signal multiplied by the transfer function estimated by the transfer function estimation unit. | 12-31-2009 |
| 20100008406 | WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION METHOD, AND COMPUTER PROGRAM - A wireless communication apparatus compensates for phase and amplitude imbalances existing among transmit and receive branches, while also preventing likelihood information and SNR estimation error produced by such imbalance compensation. In an apparatus having a plurality of transmit and receive antennas and respective branches for each antenna, a calibration processor multiplies receive signals in each receive branch by antenna calibration coefficients, in order to correct phase and amplitude imbalances existing among the receive branches. A transmit beamforming matrix estimator then estimates a transmit beamforming matrix by using the multiplied receive signals. An estimator then solves for estimated values such as the noise power, likelihood information, and channel waveform equalization values for each receive branch, and in addition, derives a final estimated value that takes the multiplication by correction coefficients into account when averaging the estimated values for each receive branch or when computing a weighted average according to likelihood. | 01-14-2010 |
| 20100008407 | COMMUNICATION APPARATUS AND COMMUNICATION CALIBRATION METHOD - There is provided a communication apparatus, including a transmission unit that transmits information by a plurality of systems and a reception unit that receives information by a plurality of systems, wherein the transmission unit includes a calibration information generation unit that generates calibration information transmitted for each the system and a calibration information generation notification generation unit that generates a calibration information generation notification indicating that the calibration information has been generated by the calibration information generation unit for each system, and the reception unit includes a calibration information detection unit that starts measurement of time based on reception of the calibration information generation notification and detecting calibration information turned back by the transmission unit for each system after a fixed time passes after starting measurement of time. | 01-14-2010 |
| 20100009644 | Receiving Apparatus, Radio Communication System, Position Estimation Method and Program - There is provided a receiving apparatus including a plurality of receiving antennas, each of which receives a radio signal in which sub-carriers of different frequencies are multiplexed, a phase calculation unit that calculates a phase difference of each radio signal received by the plurality of receiving antennas from that of a reference signal for each of the sub-carriers contained in the radio signals, and a path difference calculation unit that calculates a path difference, which is a difference of distances from a transmitting antenna from which the radio signals are transmitted to any two receiving antennas of the plurality of receiving antennas, based on the phase difference calculated by the phase calculation unit. | 01-14-2010 |
| 20100015928 | WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION METHOD, AND COMPUTER PROGRAM - A wireless communication apparatus includes a plurality of antenna branches through which radio signals are transmitted and received; a calibration factor acquiring unit that acquires a calibration factor for compensating an unbalance of phase and amplitude between the antenna branches for every predetermined frequency band; a factor memory storing the calibration factor acquired for every predetermined frequency band; a reliability determining unit that determines a reliability of the calibration factor acquired by the calibration factor acquiring unit; and a calibration factor multiplying unit that reads out the calibration factor from the factor memory to multiply a transmission signal or a reception signal to be calibrated by the readout calibration factor. | 01-21-2010 |
| 20100020857 | APPARATUS AND METHOD FOR WIRELESS COMMUNICATION, AND COMPUTER PROGRAM - A wireless communication apparatus includes a plurality of antenna branches for transmitting and receiving a wireless communication signal, a calibration coefficient calculator for calculating a calibration coefficient for each frequency band, the calibration coefficient correcting an imbalance in phase and amplitude existing between the antenna branches, a coefficient storage memory for storing the calibration coefficient of each frequency band, a calibration coefficient reader for reading the calibration coefficient of a frequency band of one of a transmission signal and a reception signal as a target to be calibrated, a calibration coefficient interpolator for interpolating a calibration coefficient of the frequency band if the coefficient storage memory stores no corresponding calibration coefficient of the frequency band, and a calibration coefficient multiplier for multiplying one of the transmission signal and the reception signal by one of the read calibration coefficient and the interpolated calibration coefficient. | 01-28-2010 |
| 20100020891 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION APPARATUS AND WIRELESS COMMUNICATION METHOD, ENCODING APPARATUS AND ENCODING METHOD, AND COMPUTER PROGRAM - A wireless communication apparatus includes: plural antennas; a channel matrix acquiring unit acquiring a channel matrix for each sub-carrier; a channel matrix encoding unit encoding the acquired channel matrix of each sub-carrier, by decomposition from signals in fixed-point representation into data and amplitude parts with a predetermined bit width; and a channel matrix information delivery unit delivering the encoded channel matrix information to a communication party. The encoding unit retrieves a first maximum value as the maximum of channel matrix elements in all sub-carriers, in plural levels, and determines an amplitude part and a normalization coefficient for normalizing channel matrix elements to a data part having the predetermined bit width, based on a ratio between a second maximum value as the maximum of channel matrix elements with respect to each sub-carrier and the first maximum value, and multiples channel matrix elements by the normalization coefficient to obtain a data part. | 01-28-2010 |
| 20100026561 | WIRELESS COMMUNICATION DEVICE, WIRELESS COMMUNICATION METHOD, AND COMPUTER PROGRAM - A wireless commutation device includes: an antenna unit including antennas transmitting and receiving wireless signals; an analog processing unit including transmitting analog circuits and receiving analog circuits processing analog transmitting and received signals; a digital processing unit processing digital transmitting and received signals; an inter-antenna propagation loss determination unit determining propagation losses between the antennas; a loopback transfer function gain acquisition unit acquiring, through loopback of a calibration signal between the antennas, gains of loopback transfer functions between antenna branches; a loopback transfer function gain correction unit correcting the gains by using the propagation losses; a correction coefficient determination unit determining the respective gain ratios among the receiving analog circuits and the transmitting analog circuits by using the corrected gains, and determining correction coefficients by using the gain ratios; and a gain calibration processing unit performing gain calibration on the digital transmitting and received signals by using the correction coefficients. | 02-04-2010 |
| 20100061357 | COMMUNICATION SYSTEM, A COMMUNICATION METHOD, AND A COMMUNICATION APPARATUS - A communication system for carrying out data communication among a plurality of communication stations is disclosed in which a first communication station for transmitting to other communication stations a Request To Send (RTS) signal for requesting a transmission upon the start of the data transmission; and a plurality of second communication stations transmitting to other communication stations a Clear To Send (CTS) signal for notifying the completion of preparing the reception, wherein the first communication station transmits the RTS signal describing at least each of addresses the second communication stations that are desired to receive the data, and receives a plurality of CTS signals transmitted from each of the second communication stations in order to increase communication capacity. | 03-11-2010 |
| 20100061358 | COMMUNICATION SYSTEM, A COMMUNICATION METHOD, AND A COMMUNICATION APPARATUS - A communication system for carrying out data communication among a plurality of communication stations is disclosed in which a first communication station for transmitting to other communication stations a Request To Send (RTS) signal for requesting a transmission upon the start of the data transmission; and a plurality of second communication stations transmitting to other communication stations a Clear To Send (CTS) signal for notifying the completion of preparing the reception, wherein the first communication station transmits the RTS signal describing at least each of addresses the second communication stations that are desired to receive the data, and receives a plurality of CTS signals transmitted from each of the second communication stations in order to increase communication capacity. | 03-11-2010 |
| 20100061493 | SYNCHRONIZATION CIRCUIT AND SYNCHRONIZATION METHOD, WIRELESS COMMUNICATION DEVICE AND WIRELESS COMMUNICATION METHOD, AND COMPUTER PROGRAM - A synchronizing circuit comprising: a coarse synchronizing circuit which determines temporary reception timing using a preamble consisting of a repetition of known training signals added to a reception packet; a synchronization candidate timing control section which sets up multiple synchronization candidates based on the temporary reception timing and controls synchronization of received signal s in each of the multiple synchronization candidates; a signal quality monitoring section which monitors signal quality of the received signal s synchronized in each of the multiple synchronization candidates; and a synchronization candidate selecting section which selects one of the synchronization candidates as a final reception timing based on a monitoring result of the signal quality in the signal quality monitoring section. | 03-11-2010 |
| 20100067409 | COMMUNICATION SYSTEM, A COMMUNICATION METHOD, AND A COMMUNICATION APPARATUS - A communication system for carrying out data communication among a plurality of communication stations is disclosed in which a first communication station for transmitting to other communication stations a Request To Send (RTS) signal for requesting a transmission upon the start of the data transmission; and a plurality of second communication stations transmitting to other communication stations a Clear To Send (CTS) signal for notifying the completion of preparing the reception, wherein the first communication station transmits the RTS signal describing at least each of addresses the second communication stations that are desired to receive the data, and receives a plurality of CTS signals transmitted from each of the second communication stations in order to increase communication capacity. | 03-18-2010 |
| 20100067588 | Wireless Communication Apparatus, Antenna Calibration Method, and Computer Program - Reversibility in the directivity in the event of transmission/reception through a multi-antenna system is well suitably compensated for by executing self-calibration. A branch is set to a reference branch, and a forward loopback transfer function and a backward loopback transfer function are acquired, whereby per-branch calibration factors are calculated. Subsequently, an other branch is set to a reference branch, and calibration factors are calculated in a similar manner. Then, the calibration factor for the reference branch is corrected in accordance with the secondly obtained calibration factor so that a calibration condition is satisfied. | 03-18-2010 |
| 20100201493 | PHOTOELECTRIC CELL DEVICE AND MALFUNCTION DETERMINING METHOD - Provided is a photoelectric-cell device including a power-source unit arranged between a ground line and a power-source line for generating photo-electromotive force and applying state information to the power-source line, and also including an inverter for converting a direct-current power source into a predetermined one and communicating with the unit via the power-source line. A power-source module of the unit includes a photoelectric-cell module, a bypass diode, a state detector, a communication unit, and a communication controller. The photoelectric-cell module includes cells for generating photo-electromotive force, first/second terminals on the ground-line/power-source-line sides, respectively. The anode of the diode is connected to the first terminal, and the cathode to the second terminal. The detector detects a state of each power-source module. The communication unit applies the information to the power-source line. The controller controls the communication unit to apply the information selectively, based on an information request from the inverter. | 08-12-2010 |
| 20100208633 | COMMUNICATION DEVICE, COMMUNICATION METHOD AND COMMUNICATION SYSTEM - There is provided a communication device including a first communicating unit, a second communicating unit that has a plurality of antennas, a first communication processing unit that processes a signal received by the first communicating unit, allows the first communicating unit to transmit a signal, and a second communication processing unit that processes a signal received by the second communicating unit, allows the second communicating unit to transmit a signal. The second communication processing unit includes an adjusting unit that adjusts a signal to be transmitted from each of the plurality of antennas based on an adjustment factor, a transmission beam pattern candidate setting unit that derives at least one transmission beam pattern based on a first transmission request and a second transmission request, and a beam pattern applying unit that applies any of the set at least one transmission beam pattern candidate based on first requested-beam-pattern identification information. | 08-19-2010 |
| 20100210221 | COMMUNICATION DEVICE, COMMUNICATION CONTROL METHOD AND COMMUNICATION SYSTEM - There is provided a communication device including: a first radio communication unit capable of radio communication in accordance with a first communication method; and a second radio communication unit capable of radio communication in accordance with a second communication method using a higher frequency band than the first communication method, wherein the first radio communication unit transmits an instruction signal instructing to learn a beam directionality to another communication device, and the second radio communication unit transmits a beam reference signal used for learning a beam directionality to said another communication device after completion of transmission of the instruction signal by the first radio communication unit and before reception of a response signal to the instruction signal. | 08-19-2010 |
| 20110025543 | OPERATION TERMINAL, PROCESSING METHOD PERFORMED BY THE OPERATION TERMINAL, INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING SYSTEM, AND INFORMATION PROCESSING METHOD PERFORMED BY THE INFORMATION PROCESSING SYSTEM - There is provided an operation terminal including a mouse which has a spherical object, an electric power acquisition section which has a piezoelectric element and also converts energy generated by rotation of the spherical object by a force applied by a user into energy for striking the piezoelectric element, and a capacitor section which acquires and accumulates electric power generated by striking the piezoelectric element. | 02-03-2011 |
| 20110025921 | INFORMATION PROCESSING APPARATUS, OPERATION TERMINAL, INFORMATION PROCESSING SYSTEM, AND INFORMATION PROCESSING METHOD PERFORMED BY THE INFORMATION PROCESSING SYSTEM - There is provided an information processing apparatus including a reception section for receiving a trigger packet, which is a packet smaller than a command packet including a command for designating processing to be executed by the information processing apparatus, from an operation terminal via a wireless signal, a trigger packet acquisition section for acquiring the trigger packet from the wireless signal received by the reception section, an electric power-supply packet generation section for generating an electric power-supply packet for supplying electric power, when the trigger packet is acquired by the trigger packet acquisition section, and a transmission section for transmitting the electric power-supply packet generated by the electric power-supply packet generation section to the operation terminal via a wireless signal. | 02-03-2011 |
| 20110065379 | RELAY STATION DEVICE, BASE STATION DEVICE, MOBILE STATION DEVICE, AND RADIO COMMUNICATION SYSTEM - There is provided a relay station including a base station-relay station resource allocation request-transmission section which transmits a base station-relay station resource allocation request indicating that allocation of a base station-relay station resource is requested, the base station-relay station resource being a resource used by a radio signal transmitted/received between a base station and the relay station, to the base station using a radio signal, a base station-relay station resource allocation response-reception section which receives base station-relay station resource information indicating the base station-relay station resource from the base station using a radio signal, as a base station-relay station resource allocation response which is a response with respect to the base station-relay station resource allocation request, and a base station-relay station resource information storage section which stores the base station-relay station resource information received by the base station-relay station resource allocation response-reception section. | 03-17-2011 |
