Patents by Inventor Kazuaki Ishioka
Kazuaki Ishioka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230396297Abstract: A base station as a wireless communication device that performs multicarrier transmission with a plurality of terminals includes: a plurality of on-chip array antennas that transmits a constant envelope modulated signal; and a control device that controls directions and bandwidths of beams of the plurality of on-chip array antennas and allocates the on-chip array antennas that transmit and receive signals to and from the terminals.Type: ApplicationFiled: August 18, 2023Publication date: December 7, 2023Applicant: Mitsubishi Electric CorporationInventor: Kazuaki ISHIOKA
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Publication number: 20230358875Abstract: An object scanning device generates an image of a radio wave scatterer that is a measurement subject disposed in a measurement area based on reflected waves of radio waves including a plurality of frequencies radiated to the radio wave scatterer, and includes a phase composite image generation unit that generates a phase composite image into which a plurality of images obtained through imaging based on the reflected waves are composed by performing complex addition for each pixel of the plurality of images.Type: ApplicationFiled: July 18, 2023Publication date: November 9, 2023Applicant: Mitsubishi Electric CorporationInventors: Michiya HAYAMA, Akinori TAIRA, Kazuaki ISHIOKA
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Publication number: 20220353700Abstract: A communication device is a base station that communicates with mobile terminals by radiating communication beams within a coverage, the communication beams including a first beam and a second beam having a shorter radio wave propagation distance than the first beam at a same transmission power, the coverage including a plurality of virtual cells. The communication device includes: a grouping processing unit that groups the plurality of virtual cells such that virtual cells in which mobile terminals capable of uplink communication using the first beam and incapable of uplink communication using the second beam are located are aggregated; and a beam forming unit that controls a radiation direction of the communication beams such that the communication beams are radiated at a same timing to all virtual cells belonging to a same group.Type: ApplicationFiled: July 18, 2022Publication date: November 3, 2022Applicant: Mitsubishi Electric CorporationInventors: Daichi UCHINO, Kazuaki ISHIOKA, Yusuke KINOSHITA
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Publication number: 20220256491Abstract: A base station which is a node device that has a function of synchronizing with a node device as a communication counterpart performs: transmitting a signal to the node device that is the communication counterpart; receiving a signal from the node device that is the communication counterpart; detecting a timing difference between the node device and the node device as a communication counterpart using a transmission timing and a reception timing; storing weight information of each of a plurality of the node devices; calculating a timing correction amount obtained by performing weighted averaging of the timing difference on the basis of weight information of the node device that is the communication counterpart; and adjusting the transmission timing using the timing correction amount.Type: ApplicationFiled: April 28, 2022Publication date: August 11, 2022Applicant: Mitsubishi Electric CorporationInventor: Kazuaki ISHIOKA
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Patent number: 10938461Abstract: A wireless control apparatus controls beamforming performed by a wireless base station apparatus that provides a communication service to a service area which includes a plurality of spots to be irradiated with a beam including a terminal search beam and a communication beam that are not used simultaneously for irradiation, and is irradiated with a plurality of the beams and is not simultaneously covered by the plurality of beams, and the apparatus includes: an arrival direction estimation unit that estimates an arrival direction of a wireless signal transmitted by a terminal communicating with a wireless base station; and a control unit that determines whether there is an active terminal in the spots on the basis of the arrival direction estimated by the arrival direction estimation unit, and, when it is determined that there is no active terminal, controls beamforming performed by the wireless base station apparatus to decrease a frequency of the terminal search beam with which one or more of the spots deteType: GrantFiled: October 28, 2016Date of Patent: March 2, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Daichi Uchino, Noriyuki Fukui, Masaaki Kusano, Kazuaki Ishioka, Keijiro Take
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Patent number: 10897717Abstract: Provided is a beam transmission/reception method, which is executed in a wireless communication system in which a terminal and a base station use a beam to communicate to and from each other. The method includes a step of grouping, by the base station, when the base station is to receive a random access channel signal transmitted as a connection request from the terminal, a plurality of beam directions by combining a main beam direction, which is determined as suitable for reception of the random access channel signal, with one or more beam directions adjacent to the main beam direction, and of receiving the random access channel signal with use of the grouped plurality of beam directions.Type: GrantFiled: February 29, 2016Date of Patent: January 19, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Noriyuki Fukui, Kazuaki Ishioka, Keijiro Take
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Publication number: 20200382186Abstract: A wireless control apparatus controls beamforming performed by a wireless base station apparatus that provides a communication service to a service area which includes a plurality of spots to be irradiated with a beam including a terminal search beam and a communication beam that are not used simultaneously for irradiation, and is irradiated with a plurality of the beams and is not simultaneously covered by the plurality of beams, and the apparatus includes: an arrival direction estimation unit that estimates an arrival direction of a wireless signal transmitted by a terminal communicating with a wireless base station; and a control unit that determines whether there is an active terminal in the spots on the basis of the arrival direction estimated by the arrival direction estimation unit, and, when it is determined that there is no active terminal, controls beamforming performed by the wireless base station apparatus to decrease a frequency of the terminal search beam with which one or more of the spots deteType: ApplicationFiled: October 28, 2016Publication date: December 3, 2020Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Daichi UCHINO, Noriyuki FUKUI, Masaaki KUSANO, Kazuaki ISHIOKA, Keijiro TAKE
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Patent number: 10812134Abstract: A wireless communication apparatus includes a channel-usage selection unit to select one frequency channel for each time slot from a plurality of predetermined candidate frequency channels, and a wireless communication unit to perform wireless communication by using the frequency channel selected by the channel-usage selection unit. The channel-usage selection unit selects a frequency channel that is different from a frequency channel to be used in a same time slot by an adjacent cell located at a cell interval, equal to or smaller than the predetermined first number of cells, from a cell used for the wireless communication, and allows the frequency channel selected to overlap with the frequency channel to be used in the same time slot by a remote cell located at a cell interval, greater than the first number of cells and equal to or smaller than the number of the candidate frequency channels, from a cell used for the wireless communication.Type: GrantFiled: July 19, 2017Date of Patent: October 20, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Kazumasa Suzuki, Kazuaki Ishioka, Hiroyasu Sano
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Publication number: 20200186187Abstract: A wireless communication apparatus includes a channel-usage selection unit to select one frequency channel for each time slot from a plurality of predetermined candidate frequency channels, and a wireless communication unit to perform wireless communication by using the frequency channel selected by the channel-usage selection unit. The channel-usage selection unit selects a frequency channel that is different from a frequency channel to be used in a same time slot by an adjacent cell located at a cell interval, equal to or smaller than the predetermined first number of cells, from a cell used for the wireless communication, and allows the frequency channel selected to overlap with the frequency channel to be used in the same time slot by a remote cell located at a cell interval, greater than the first number of cells and equal to or smaller than the number of the candidate frequency channels, from a cell used for the wireless communication.Type: ApplicationFiled: July 19, 2017Publication date: June 11, 2020Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Kazumasa SUZUKI, Kazuaki ISHIOKA, Hiroyasu SANO
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Patent number: 10594375Abstract: A wireless base station apparatus that communicates with a plurality of terminals via spatial multiplexing includes: an active array antenna to transmit a first transmit signal; sector antennas to transmit second transmit signals; and a digital signal processor that generates the first transmit signal that is transmitted from the active array antenna and generates the second transmit signals that are transmitted from the sector antennas, the second transmit signals being transmit signals for eliminating interference between the terminals generated by the first transmit signal.Type: GrantFiled: June 28, 2016Date of Patent: March 17, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventor: Kazuaki Ishioka
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Publication number: 20190165842Abstract: A wireless base station apparatus that communicates with a plurality of terminals via spatial multiplexing includes: an active array antenna to transmit a first transmit signal; sector antennas to transmit second transmit signals; and a digital signal processor that generates the first transmit signal that is transmitted from the active array antenna and generates the second transmit signals that are transmitted from the sector antennas, the second transmit signals being transmit signals for eliminating interference between the terminals generated by the first transmit signal.Type: ApplicationFiled: June 28, 2016Publication date: May 30, 2019Applicant: MITSUBISHI ELECTRIC CORPORATIONInventor: Kazuaki ISHIOKA
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Patent number: 10171279Abstract: A transmitter includes: a null symbol map unit to determine a null symbol arrangement pattern by combining different unit patterns determining positions of data symbols and null symbols; a subcarrier map unit to assign, in a two-dimensional space defined by a plurality of subcarriers for use in multicarrier transmission and a time series represented in units of time determined in accordance with a single symbol, transmission data to positions of data symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern; a modulator to generate the data symbols by modulating the assigned transmission data, assign null symbols having a power of 0 to positions of null symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern, and generate transmission symbols of the respective subcarriers; and a baseband section to output a baseband signal based on the transmission symbols.Type: GrantFiled: April 9, 2015Date of Patent: January 1, 2019Assignee: Mitsubishi Electric CorporationInventors: Kazumasa Suzuki, Kazuaki Ishioka
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Publication number: 20180368005Abstract: Provided is a beam transmission/reception method, which is executed in a wireless communication system in which a terminal and a base station use a beam to communicate to and from each other. The method includes a step of grouping, by the base station, when the base station is to receive a random access channel signal transmitted as a connection request from the terminal, a plurality of beam directions by combining a main beam direction, which is determined as suitable for reception of the random access channel signal, with one or more beam directions adjacent to the main beam direction, and of receiving the random access channel signal with use of the grouped plurality of beam directions.Type: ApplicationFiled: February 29, 2016Publication date: December 20, 2018Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Noriyuki FUKUI, Kazuaki ISHIOKA, Keijiro TAKE
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Publication number: 20180054343Abstract: A transmitter includes: a null symbol map unit to determine a null symbol arrangement pattern by combining different unit patterns determining positions of data symbols and null symbols; a subcarrier map unit to assign, in a two-dimensional space defined by a plurality of subcarriers for use in multicarrier transmission and a time series represented in units of time determined in accordance with a single symbol, transmission data to positions of data symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern; a modulator to generate the data symbols by modulating the assigned transmission data, assign null symbols having a power of 0 to positions of null symbols of the respective subcarriers determined in accordance with the null symbol arrangement pattern, and generate transmission symbols of the respective subcarriers; and a baseband section to output a baseband signal based on the transmission symbols.Type: ApplicationFiled: April 9, 2015Publication date: February 22, 2018Applicant: Mitsubishi Electric CorporationInventors: Kazumasa SUZUKI, Kazuaki ISHIOKA
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Patent number: 9780899Abstract: A radio communication apparatus that performs radio communication according to a multicarrier scheme includes: a transmitting unit including a null inserting unit that dispersedly arranges null symbols in a two-dimensional space of time and frequency in radio data, and a differential modulating unit that performs differential modulation on a data symbol part other than the null symbols; and a receiving unit including an interference measuring unit that measures interference power for a data symbol that is a measurement target by using a null symbol adjacent to the data symbol in the two-dimensional space of time and frequency, and a delay detecting unit that performs weighting on each data symbol according to the interference power measured for each data symbol and that performs delay detection between data symbols.Type: GrantFiled: July 17, 2014Date of Patent: October 3, 2017Assignee: Mitsubishi Electric CorporationInventors: Kazumasa Suzuki, Kazuaki Ishioka
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Patent number: 9762345Abstract: A receiving device according to the present invention is a receiver for receiving a signal including null symbols. The receiver includes a null extraction unit for extracting the null symbols from the received signal, a power calculation unit for calculating a power of each null symbol extracted by the null extraction unit, a two-dimensional filter unit for performing a plurality of kinds of filtering for the powers of the respective null symbols calculated by the power calculation unit and obtaining a plurality of kinds of average power values, and a normalizing unit for normalizing a data symbol included in the received signal based on a value obtained by performing nonlinear processing to the average power values obtained by the two-dimensional filter unit.Type: GrantFiled: March 19, 2015Date of Patent: September 12, 2017Assignee: Mitsubishi Electric CorporationInventor: Kazuaki Ishioka
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Publication number: 20170085334Abstract: A receiving device according to the present invention is a receiver for receiving a signal including null symbols. The receiver includes a null extraction unit for extracting the null symbols from the received signal, a power calculation unit for calculating a power of each null symbol extracted by the null extraction unit, a two-dimensional filter unit for performing a plurality of kinds of filtering for the powers of the respective null symbols calculated by the power calculation unit and obtaining a plurality of kinds of average power values, and a normalizing unit for normalizing a data symbol included in the received signal based on a value obtained by performing nonlinear processing to the average power values obtained by the two-dimensional filter unit.Type: ApplicationFiled: March 19, 2015Publication date: March 23, 2017Applicant: Mitsubishi Electric CorporationInventor: Kazuaki ISHIOKA
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Publication number: 20160241351Abstract: A radio communication apparatus that performs radio communication according to a multicarrier scheme includes: a transmitting unit including a null inserting unit that dispersedly arranges null symbols in a two-dimensional space of time and frequency in radio data, and a differential modulating unit that performs differential modulation on a data symbol part other than the null symbols; and a receiving unit including an interference measuring unit that measures interference power for a data symbol that is a measurement target by using a null symbol adjacent to the data symbol in the two-dimensional space of time and frequency, and a delay detecting unit that performs weighting on each data symbol according to the interference power measured for each data symbol and that performs delay detection between data symbols.Type: ApplicationFiled: July 17, 2014Publication date: August 18, 2016Applicant: Mitsubishi Electric CorporationInventors: Kazumasa SUZUKI, Kazuaki ISHIOKA
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Publication number: 20100150013Abstract: A calibration method according to the present invention includes a step of first channel estimating for transmitting a pilot signal from a first antenna and receiving the pilot signal at a second antenna different from the first antenna to calculate a first channel estimation value; a step of second channel estimating for transmitting a plot signal from the second antenna and receiving the pilot signal at the first antenna to calculate a second channel estimation value; and a step of correction coefficient calculating for calculating, by using the first and second channel estimation values, a correction coefficient.Type: ApplicationFiled: January 10, 2008Publication date: June 17, 2010Applicant: Mitsubishi Electric CorporationInventors: Yoshitaka Hara, Akinori Taira, Kenichi Tajima, Kazunari Kihira, Michiaki Takano, Kazuaki Ishioka, Yasunori Nouda
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Publication number: 20090029657Abstract: An auto frequency control method of this invention has a first step of a base station BS detecting a frequency deviation ?fBS of an uplink signal transmitted from a mobile station MS, a second step of the base station BS transmitting an instructing amount of increase or decrease fcont of the transmission frequency fMS of the uplink signal to the mobile station MS on the basis of the frequency deviation ?fBS of the uplink signal, and a third step of the mobile station MS shifting the transmission frequency fMS of the uplink signal according to the instructing amount of increase or decrease fcont transmitted from the base station BS.Type: ApplicationFiled: July 25, 2006Publication date: January 29, 2009Applicants: MITSUBISHI ELECTRIC CORPORATION, NTT DoCoMo, Inc,Inventors: Takuya Sakaishi, Kazuaki Ishioka, Yuji Inoue, Shingo Higuchi