Patent application number | Description | Published |
20090232244 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION METHOD, TRANSMISSION APPARATUS, AND RECEPTION APPARATUS - The transmission apparatus performs orthogonalization processing to each of the signal sequence obtained by dividing each of the more than one transmission streams into more than one signal sequence based on the orthogonality of wireless resources. The signal sequence is then sent from multiple antennas. The reception apparatus performs the orthogonal separation processing based on the above orthogonality to the received signals to separate multiple reception signal sequence having the orthogonal characteristic, and applies a predetermined signal separation scheme based on the propagation path estimation matrix between the reception apparatus and the transmission apparatus to any one of the pairs of the separated reception signal sequence, thereby separating a signal sequence before subjected to the above orthogonalization processing. | 09-17-2009 |
20090238126 | Communication System, Mobile Station, And Communication Method - A communication system includes a mobile station and a base station. The mobile station calculates estimated TA information based on the position of the mobile station and an amount of propagation path delay. The mobile station determines, based on TA information transmitted from the base station and the estimated TA information, whether the TA information is addressed thereto. The mobile station determines whether to transmit “Message | 09-24-2009 |
20090247169 | Base Transceiver Station, Mobile Station, And Wireless Communication Method - A base transceiver station used in a wireless communication system in which the location of each base transceiver station antenna is included in a coverage area of another base transceiver station antenna, the base transceiver station including a measuring unit measuring a distance between a mobile station and a base transceiver station antenna to which the mobile station is communicatively connected. The base transceiver station includes a switching unit switching the communication connection of the mobile station to another base transceiver station antenna when the distance measured by the measuring unit becomes less than or equal to a predetermined value. | 10-01-2009 |
20090316813 | Transmitter, Receiver, Transmission Method and Reception Method - A phase relationship between signal sequences obtained by space-time-coding transmission signals is controlled so as to give a difference in peak power between the signal sequences to be transmitted from separate transmission antennas, and either one or both of the signal sequences are controlled so as to minimize a rate of a peak power of one of the signal sequences to an average transmission power of the signal sequences. | 12-24-2009 |
20100103984 | FREQUENCY-DIVISION MULTIPLEXING TRANSCEIVER APPARATUS, WAVE-NUMBER-DIVISION MULTIPLEXING TRANSCEIVER APPARATUS AND METHOD THEREOF - A frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to both symbol and mobile station, is disclosed. The apparatus encodes transmission data, modulates the encoded data, compresses the time domains of each symbol of the modulated transmission-symbol sequence, repeats the symbols a specified number of times, rearranges each of the symbols of the obtained repetitive-symbol sequence so that they have the same arrangement as the transmission-symbol sequence, generates each phase that changes at a speed specific to each symbol of the transmission-symbol sequence, performs phase rotation specific to the symbols for each symbol of the rearranged repetitive-symbol sequence, generates phase that changes at a speed specific to a mobile station, performs phase rotation specific to the mobile station for the symbol sequence for which the phase rotation was performed, and transmits the phase-rotated symbol sequence. | 04-29-2010 |
20100248614 | RELAY STATION, RELAY METHOD, RECEIVING STATION AND RECEIVING METHOD - A relay station includes a receiver that receives a signal from a base transceiver station, a detection unit that detects a carrier frequency deviation of the received signal, and a calculation unit that calculates a delay rate of the signal based on the detected carrier frequency deviation. The relay station includes a delay control unit that controls an amount of delay of the signal in accordance with the calculated delay rate, a compensation unit that compensates for the detected carrier frequency deviation of the signal, and a transmitter that transmits the signal of which the amount of delay is controlled and of which the carrier frequency deviation is compensated for. | 09-30-2010 |
20100248663 | ANTENNA INSTALLATION METHOD IN A MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION METHOD - A communication system includes a first communication apparatus and a second communication apparatus. The second communication apparatus transmits different signals from first and second antennas, and first and second antennas of the first communication apparatus receive the signals, respectively. An angle formed by a first line connecting the first communication apparatus and the first antenna of the second communication apparatus and a second line connecting the first communication apparatus and the second antenna of the second communication apparatus is set to be equal to or smaller than 180 degrees. A distance between the first and second antennas of the first communication apparatus is set to a specified value, which is determined by a signal wavelength and the angle formed by the first line and the second line. | 09-30-2010 |
20100248743 | FREQUENCY CONTROL DEVICE, FREQUENCY CONTROL METHOD, AND BASE TRANSCEIVER STATION - A frequency control device receiving a signal transmitted from each of a plurality of mobile stations, the frequency control device includes a first detecting unit to detect a frequency deviation generated from the signal, a second detecting unit to acquire information about at least a current position or movement of each of the mobile stations as classification information, and a classifying unit to classify mobile stations estimated to be moving in a same moving direction with a same moving speed as a first mobile station based on the classification information. The frequency control device includes a first calculating unit to calculate a first frequency deviations of a signal received from the first mobile station, and a compensation unit to compensate the frequency deviation of the signal received from the first mobile station based on the first frequency deviation. | 09-30-2010 |
20100303134 | WIRELESS RELAY DEVICE AND WIRELESS RELAY METHOD - A device and a process which enable use of transmission diversity in transmission to a receiving station when wirelessly relaying wireless signals from a transmitting station to the receiving station. A reception antenna RA in a wireless relay device (RS) receives from the transmitting station such as a base station (BS) a signal in which data signals are respectively allocated to carriers at adjacent radio frequencies. The wireless relay device performs space frequency block coding (SFBC) of the received signal. Then, the wireless relay device transmits SFBC-encoded signals through two transmission antennas SA | 12-02-2010 |
20110051784 | RELAY METHOD AND RELAY APPARATUS - A wireless signal relay method comprises: receiving a wireless signal transmitted by mapping a first signal to be relayed in a repetitive manner to a plurality of wireless resources; generating a combined signal by combining signals repetitively mapped as the first signal to be relayed; and transmitting the combined signal. | 03-03-2011 |
20110053497 | WIRELESS COMMUNICATION METHOD AND RELAY APPARATUS - A wireless communication method executed by a wireless communication system including a relay apparatus, a first wireless communication apparatus, and a second wireless communication apparatus includes the following operations. Upon receiving a wireless signal from the first wireless communication apparatus, the relay apparatus adds advice information, which indicates that the wireless signal has been relayed, to the received wireless signal. The relay apparatus transmits the wireless signal added the advice information thereto to the second wireless communication apparatus. The second wireless communication apparatus detects the advice information to determine whether the wireless signal has been relayed. | 03-03-2011 |
20110116439 | RELAY DEVICE, BASE STATION DEVICE, MOBILE STATION DEVICE, AND RELAY METHOD - A relay device includes a first receiving unit which receives an Orthogonal Frequency Division Multiple Access (OFDMA) signal in a first frequency band, a detection unit which detects, from the OFDMA signal, a signal of a second frequency band that is included in the first frequency band and narrower than the first frequency band, a frequency transformation unit which transforms the second frequency band of the detected signal into a frequency band that is not included in the second frequency band, and a first transmitting unit which transmits the detected signal that is transformed by the frequency transformation unit. | 05-19-2011 |
20110189972 | MOBILE STATION, BASE STATION, AND WIRELESS COMMUNICATION METHOD - A mobile station that performs wireless communication through a base station, includes a first connection setup request unit configured to make a first connection setup request for an emergency call and a normal call when communication performed in the communication region of the base station is in a congestion state, the emergency call and the normal call using a signal sequence that corresponds to a sequence number of a connection setup request signal used when communication performed in a communication region of the base station is in a normal state, and a second connection setup request unit configured to make a second connection setup request for another one of the emergency call and the normal call different from the first connection setup request, using a generated-signal sequence generated from the sequence number, when communication performed in the communication region of the base station is in the congestion state. | 08-04-2011 |
20120108280 | WIRELESS COMMUNICATION SYSTEM, BASE STATION, MOBILE STATION, AND WIRELESS COMMUNICATION METHOD - A wireless communication system includes a mobile station, which has a selector that from among prepared signal sequences, selects one or more arbitrary signal sequences and from among intervals included in a given period, selects one or more arbitrary intervals, and further has a transmitter that transmits the signal sequence corresponding to the interval selected by the selector. The wireless communication system further includes a base station, which has a receiver that receives a signal transmitted from the mobile station, and an identifier that identifies the mobile station, based on a correspondence value in each interval of the received signal. | 05-03-2012 |
20120161865 | AMPLIFYING DEVICE AND AMPLIFYING METHOD - An amplifying device includes a signal separating unit that separates a first signal and a second signal from an input signal; a first signal-generating unit that generates, based on the first signal, a first cancelling signal that suppresses ringing caused during processing of the first signal; a first combining unit that combines the first signal and the first cancelling signal; a first amplifying unit that amplifies a signal output from the first combining unit; a second signal-generating unit that generates, based on the second signal, a second cancelling signal that suppresses ringing caused during processing of the second signal; a second combining unit that combines the second signal and the second cancelling signal; a second amplifying unit that amplifies a signal output from the second combining unit; and a third combining unit that combines a signal output from the first amplifying unit and one output from the second amplifying unit. | 06-28-2012 |
20120214432 | AMPLIFIER CIRCUIT, TRANSMITTER, AND METHOD OF CONTROLLING AMPLIFIER CIRCUIT - A signal separating unit separates an input signal into a first branch signal and a second branch signal in such a manner that, as the amplitude of the input signal decreases, the amplitude of the first branch signal and the second branch signal decreases and the difference between a phase of the first branch signal and a phase of the second branch signal increases and, as the amplitude of the input signal increases, the amplitude of the first branch signal and the second branch signal increases and the difference between the phase of the first branch signal and the phase of the second branch signal decreases. An amplifier amplifies the first branch signal. Another amplifier amplifies the second branch signal. A combining unit combines signals that are output from the amplifiers together, thereby generating an output signal. | 08-23-2012 |
20120224654 | TRANSMITTER AND DISTORTION COMPENSATING METHOD - A transmitter, when the power changes at a certain timing, adjusts the gain for the transmission signal before the application of the distortion compensation process correspondingly to the amplitude of the transmission signal at the certain timing based on the average of the power of a transmission signal before application of the distortion compensation process, obtains a distortion compensation coefficient corresponding to the value of the power of the adjusted transmission signal from the LUT, applies the distortion compensation process to the transmission signal using the obtained distortion compensation coefficient, calculates an update for a distortion compensation coefficient corresponding to the obtained distortion compensation coefficient and stored in the LUT based on an error between the power of the transmission signal amplified by an amplifier and the power of the transmission signal before the application of the distortion compensation process, and updates the LUT using the calculated update. | 09-06-2012 |
20120328048 | PEAK SUPPRESSING APPARATUS, PEAK SUPPRESSING METHOD AND WIRELESS COMMUNICATIONS APPARATUS - A peak suppressing apparatus includes a pre-emphasis section that performs a pre-emphasis process on a signal, which is to be wirelessly transmitted and a peak of which is to be suppressed, the pre-emphasis process emphasizing a given frequency range component of the signal, a clipping section that limits, to a given threshold value, the amplitude of a signal that has been subjected to the pre-emphasis process, a de-emphasis section that performs a de-emphasis process on a signal, whose amplitude has been limited, the de-emphasis process suppressing a given frequency range component of the signal, and a frequency converter that converts, to allow wireless transmission, the frequency of a signal that has been subjected to the de-emphasis process. | 12-27-2012 |
20130142239 | PEAK SUPPRESSOR, RADIO COMMUNICATION APPARATUS AND PEAK SUPPRESSION METHOD - There is provided a peak suppressor including a first peak position detector to detect a first time when amplitude of a transmission signal changes in a convex manner and exceeds a specific level as a first peak position, a second peak position detector to detect a second time that is different by a predetermined time from the first peak position when the amplitude of the transmission signal exceeds the specific level as a second peak position, a suppression signal generator to generate a suppression signal for suppressing the amplitude of the transmission signal to a value that is equal to or lower than the specific level, based on amplitude and phase of the transmission signal corresponding to the first and second peak positions detected by the first and second peak position detectors, and an adder to add the suppression signal generated by the suppression signal generator to the transmission signal. | 06-06-2013 |
20130335140 | AMPLIFICATION DEVICE AND AMPLIFICATION METHOD - An amplification device includes a first filter configured to pass a predetermined frequency component of a first digital signal phase-modulated with a constant amplitude; a first distortion compensator configured to compensate the signal output from the first filter in advance for distortion occurring in an amplified signal, based on a first distortion compensation coefficient dependent on an amplitude of the signal output from the first filter; a first converter configured to convert the signal compensated by the first distortion compensator into a first analog signal; and a first amplifier configured to amplify the first analog signal. | 12-19-2013 |
20140002186 | DISTORTION COMPENSATING APPARATUS AND DISTORTION COMPENSATING METHOD | 01-02-2014 |
20140139133 | LED ILLUMINATING METHOD AND APPARATUS FOR IMAGE MEASURING DEVICE - In an image measuring device that performs, on a work piece to be measured, low brightness continuous illumination and one of stroboscopic illumination and continuous illumination with high brightness, a common high-brightness LED is used, and driving circuits are switched between pseudo-continuous illumination and one of stroboscopic illumination and continuous illumination. In the pseudo-continuous illumination, an average brightness is reduced by pulse lighting. In the stroboscopic illumination, high brightness light is emitted instantaneously. The switching between the pseudo-continuous illumination and one of the stroboscopic illumination and continuous illumination may be performed by changing a lighting cycle of the high-brightness LED. | 05-22-2014 |
20140167844 | DISTORTION COMPENSATION DEVICE AND DISTORTION COMPENSATION METHOD - A distortion compensation device includes: a distortion compensator configured to output, to a power amplifier, a predistortion signal obtained by performing distortion compensation processing on a transmission signal by using a distortion compensation coefficient, wherein the distortion compensator limits bands of a reference signal and a feedback signal so that the bands fall in a pass band and updates the distortion compensation coefficient based on an error between the reference signal and the feedback signal, the reference signal corresponding to the predistortion signal, the feedback signal corresponding to an output feedback of the power amplifier. | 06-19-2014 |
20140197885 | AMPLIFYING DEVICE, DISTORTION COMPENSATING DEVICE, AND AMPLIFYING METHOD - An amplifying device including: a first amplifier configured to generate a first output signal by amplifying an input signal, a second amplifier configured to generate a second output signal by amplifying the first output signal, and a processor configured to perform a first compensation by compensating a distortion for the second amplifier in accordance with the first output signal and the second output signal. | 07-17-2014 |
20140285276 | MODULATING DEVICE AND MODULATION METHOD - A modulating device including: a first convertor configured to generate a converted analog signal by analog conversion on a input digital signal, a modulator configured to generate a modulated signal by quadrature modulation, a phase shifter configured to generate a phase shift signal by phase rotation, a demodulator configured to generate a demodulated signal by quadrature demodulation, a second convertor to generate a converted digital signal by digital conversion, a calculating circuit configured to estimate a the first direct current offset based on the input digital signal and the converted digital signal, the first direct current offset being a noise of digital current component generated between the input digital signal inputted to the first convertor and the output signal inputted to the demodulator, and a correcting circuit configured to correct at least one among from the input digital signal to the output signal based on the first direct current offset. | 09-25-2014 |
20140286454 | DISTORTION COMPENSATION DEVICE AND DISTORTION COMPENSATION DEVICE METHOD - A distortion compensation device includes: a memory configured to store a first and second table, different addresses being assigned to the first and second table respectively, each of the addresses being related to a distortion compensation coefficient to compensate for a non-linear distortion, a first address in the first table and a second address in the second table corresponding to respective first and second ranges of power or amplitude of a transmission signal, and parts of the first and second ranges overlapping each other; and a processor coupled to the memory and configured to: update the respective distortion compensation coefficients related to the first address and the second address simultaneously, in accordance with a single value of the power or the amplitude, and compensate for the non-linear distortion generated by an amplifier amplifying the power of the transmission signal, by using at least one of the first and second table. | 09-25-2014 |
20140347132 | POWER AMPLIFIER APPARATUS, TRANSMITTER APPARATUS, AND METHOD OF CONTROLLING THE POWER AMPLIFIER APPARATUS - A power amplifier apparatus includes an amplifier configured to amplify an input signal converted into an analog signal, a distortion compensator circuitry configured to perform a pre-distortion process to an input signal at a second sampling rate higher than a first sampling rate at which the input signal is converted into an analog signal, a remover configured to remove a frequency component exceeding a frequency band corresponding to the first sampling rate from the input signal subjected to the pre-distortion process, a first rate converter configured to convert a sampling rate of the input signal from which the frequency component is removed from the second sampling rate to the first sampling rate, and a first signal converter configured to convert the input signal the sampling rate of which is converted into an analog signal at the first sampling rate to supply the input signal converted into the analog signal to the amplifier. | 11-27-2014 |