Patents by Inventor Akinori Taira

Akinori Taira 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).

  • Publication number: 20200052840
    Abstract: The base station allocates, to one terminal, at least one transmission layer and allocates at least one resource block that is a minimum allocation unit of a communication resource in each transmission layer, to transmit a signal to the terminal, and includes processing units each associated with one of the transmission layers, the processing units being equal in number to the transmission layers. Each processing unit includes a reference signal generation unit to generate a reference signal to be used by the terminal in demodulation processing on a received signal, and an information processing unit to determine an arrangement of the resource block in which to transmit the reference signal to the terminal, based on at least one of a state of a channel between the base station and the terminal or information on the resource block to be used in transmission of the reference signal in an adjacent cell.
    Type: Application
    Filed: April 27, 2017
    Publication date: February 13, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Fumihiro HASEGAWA, Akinori TAIRA, Hiroki IURA, Shigeru UCHIDA, Mitsuru MOCHIZUKI, Tadahiro SHIMODA
  • Publication number: 20200043339
    Abstract: A processing device according to the present invention includes an object identification unit that generates, based on data measured by sensors, an object identification information that is information indicative of a state of an object, and a reliability degree determination unit that determines a reliability degree of the object identification information using at least one of individual information of the sensors, environmental information obtained when the sensors have performed the measurement, and time information that is a time at which the sensors have performed measurement.
    Type: Application
    Filed: April 26, 2017
    Publication date: February 6, 2020
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Seiji KOZAKI, Akinori TAIRA, Kenichi NAKURA
  • Publication number: 20200007369
    Abstract: The present invention relates to a method implemented by computer means of a communicating entity, for inserting a reference signal for phase tracking, said communicating entity using a discrete Fourier transformation spread orthogonal frequency division multiplexing modulator, characterized in that the method comprises: obtaining a succession of signal samples by inserting said reference signal for phase tracking within a succession of data samples, according to at least one insertion pattern chosen among pre-defined patterns with respect to predetermined criteria of communication conditions, and feeding said modulator with a succession of signal blocks obtained from said succession of signal samples, so as to apply the discrete Fourier transformation after the insertion of the reference signal for phase tracking.
    Type: Application
    Filed: December 27, 2017
    Publication date: January 2, 2020
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Cristina CIOCHINA-DUCHESNE, Fumihiro HASEGAWA, Akihiro OKAZAKI, Akinori TAIRA
  • Publication number: 20190393999
    Abstract: A base station includes: a control unit that allocates one or more layers per terminal for transmission to one or more terminals, and configures positions in a frequency domain and a time domain of reference signals of each of the layers on the basis of at least one of information indicating a position of each of the terminals and information indicating condition of each of channel between the transmission device and the one or more terminals; a processing unit that arranges the reference signals of each of the layers in the frequency domain and the time domain on the basis of the positions in the frequency domain and the time domain configured by the control unit; and a precoding unit and a transmitting unit that perform space-division multiplexing on signals of one or more layers arranged by the processing unit, and transmit the multiplexed signals.
    Type: Application
    Filed: December 7, 2016
    Publication date: December 26, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Fumihiro HASEGAWA, Akinori TAIRA, Shigeru UCHIDA, Noriyuki FUKUI, Akihiro OKAZAKI, Hiroki IURA
  • Publication number: 20190380049
    Abstract: A transmission device according to the present invention includes a reference-signal information management unit as an identifier to identify an interfering terminal that is a possible terminal to perform communication interfering with communication with a target terminal that is a destination terminal of a data signal, and a transmitter to set a group ID for reference signal generation to a group formed by the interfering terminal and the target terminal.
    Type: Application
    Filed: January 10, 2018
    Publication date: December 12, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Fumihiro Hasegawa, Akinori Taira
  • Publication number: 20190372631
    Abstract: A transmission device to be applied to a communication system configured to carry out multi-user MIMO downlink communication, includes a precoder configured to apply transmission precoding processing, a nonlinear processor configured to carry out successive interference cancellation, a beam forming controller configured to form a plurality of beams and to control a beam radiation direction, and a user ordering processor configured to estimate a positional relationship among the plurality of user terminals from radiation direction information on each of the beams, order users in ascending order of a distance from a specific user, and determine a pairing of a transmission target user and an interference permissible user. The precoder determines two users of the transmission target user and the interference permissible user for each user based on the pairing result, and carries out null steering for users other than the two users, to thereby carry out the transmission precoding processing.
    Type: Application
    Filed: June 20, 2016
    Publication date: December 5, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Akinori TAIRA, Hiroshi NISHIMOTO
  • Patent number: 10381723
    Abstract: A wireless communication apparatus, for example a wireless base station that spatially multiplexes data for transmission, includes plural array antennas and a beam shape controller that controls the array antennas to form beams of different shapes and each transmit signals for communication quality measurement in an area to be covered by the apparatus, and determines an initial value of a beam shape to be used in data transmission to a counterpart device that has received the signal for communication quality measurement, and after the initial value is determined, repeatedly executes processing to control the array antennas to tentatively change a beam shape in use in data transmission to the counterpart device, and redetermine a beam shape to be used in data transmission to the counterpart device, based on communication quality measured when the post-tentative-change beam shape is used and communication quality measured when the pre-tentative-change beam shape is used.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: August 13, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shigeru Uchida, Akihiro Okazaki, Akinori Taira
  • Publication number: 20190020435
    Abstract: A base station serving as a transmission apparatus includes a plurality of transmission antennas capable of forming beams directed to a plurality of terminals, which are reception apparatus, and a precoder configured to perform outer precoding on transmission signals transmitted from the plurality of transmission antennas. The plurality of terminals include at least one first reception apparatus, which are transmission destinations of the transmission signals, and second reception apparatus, which are reception apparatus other than the first reception apparatus. The precoder performs outer precoding on the transmission signals transmitted from the plurality of transmission antennas so that received power in the second reception apparatus among the plurality of reception apparatus is equal to or less than a threshold.
    Type: Application
    Filed: February 22, 2016
    Publication date: January 17, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroshi NISHIMOTO, Hiroki IURA, Akinori TAIRA
  • Publication number: 20190020427
    Abstract: Provided is a wireless communication device, which is configured to: execute, for each of a plurality of counterpart wireless communication devices to be targets, first processing for determining a maximum number of assignable transmission streams based on transmission line quality information with respect to each of the plurality of counterpart wireless communication devices; execute, for each of the plurality of counterpart wireless communication devices, second processing for calculating a diversity order value of a single stream or each of a plurality of streams through use of the maximum number of transmission streams obtained by the first processing, and compare the calculated diversity order value of the single stream or each of the plurality of streams and a diversity order lower limit value set in advance to each other, to thereby determine a number of transmission streams; and determine the number of transmission streams obtained by the second processing as a finally-determined number of transmissio
    Type: Application
    Filed: February 26, 2016
    Publication date: January 17, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shigeru UCHIDA, Akinori TAIRA, Hiroshi NISHIMOTO
  • Patent number: 10090898
    Abstract: A transmitting apparatus according to the present invention includes transmission antennas capable of forming a plurality of beams respectively directed to a plurality of terminals and a precoder unit that performs precoding on signals transmitted from the transmission antennas such that received power in the terminals excluding a desired terminal serving as a transmission destination of a transmission signal and two or more IUI terminals, which are the terminals other than the desired terminal, is equal to or smaller than a threshold.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: October 2, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroshi Nishimoto, Akinori Taira
  • Patent number: 10033446
    Abstract: A transmitting apparatus includes transmission antennas capable of forming a plurality of beams respectively directed to a plurality of terminals and a precoder unit that performs precoding on signals transmitted from the transmission antennas such that received power in the terminals excluding a desired terminal serving as a transmission destination of a transmission signal and IUI terminals, which are the terminals other than the desired terminal, is equal to or smaller than a threshold.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: July 24, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroshi Nishimoto, Akinori Taira
  • Publication number: 20180138590
    Abstract: A wireless communication apparatus, for example a wireless base station that spatially multiplexes data for transmission, includes plural array antennas and a beam shape controller that controls the array antennas to form beams of different shapes and each transmit signals for communication quality measurement in an area to be covered by the apparatus, and determines an initial value of a beam shape to be used in data transmission to a counterpart device that has received the signal for communication quality measurement, and after the initial value is determined, repeatedly executes processing to control the array antennas to tentatively change a beam shape in use in data transmission to the counterpart device, and redetermine a beam shape to be used in data transmission to the counterpart device, based on communication quality measured when the post-tentative-change beam shape is used and communication quality measured when the pre-tentative-change beam shape is used.
    Type: Application
    Filed: August 5, 2015
    Publication date: May 17, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shigeru UCHIDA, Akihiro OKAZAKI, Akinori TAIRA
  • Patent number: 9973251
    Abstract: A radio transmission apparatus includes a plurality of antennas each having an amplifier, a transmission signal generation unit (modulation units, S/P units, and FFT units) which generates a signal to be transmitted to a terminal via the antennas, and a weighting processing unit (a precoder unit, a maximum power calculation unit, and multipliers) which executes a weighting process on a signal to be transmitted to the terminal, which has been generated by the transmission signal generation unit, based on channel state information between the radio transmission apparatus and the terminal and an output limit value of the amplifier.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: May 15, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Akinori Taira, Shigeru Uchida, Hiroki Iura
  • Publication number: 20180123667
    Abstract: A radio transmission apparatus includes a plurality of antennas each having an amplifier, a transmission signal generation unit (modulation units, S/P units, and FFT units) which generates a signal to be transmitted to a terminal via the antennas, and a weighting processing unit (a precoder unit, a maximum power calculation unit, and multipliers) which executes a weighting process on a signal to be transmitted to the terminal, which has been generated by the transmission signal generation unit, based on channel state information between the radio transmission apparatus and the terminal and an output limit value of the amplifier.
    Type: Application
    Filed: August 5, 2015
    Publication date: May 3, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Akinori TAIRA, Shigeru UCHIDA, Hiroki IURA
  • Publication number: 20180115447
    Abstract: A transmitting apparatus includes a first signal generating unit that generates, on the basis of data a first signal transmitted by single carrier block transmission; a second signal generating unit that generates, on the basis of an RS, a second signal transmitted by orthogonal frequency division multiplex transmission; a switching operator that selects and outputs the second signal in a first transmission period and selects and outputs the first signal in a second transmission period; an antenna that transmits the signal output from the switching operator; and a control-signal generating unit that controls the second signal generating unit such that, in the first transmission period, the RS is arranged in a frequency band allocated for transmission of the RS from the transmitting apparatus among frequency bands usable in OFDM.
    Type: Application
    Filed: August 7, 2015
    Publication date: April 26, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Fumihiro HASEGAWA, Akinori TAIRA
  • Publication number: 20180102819
    Abstract: A transmitting apparatus includes transmission antennas capable of forming a plurality of beams respectively directed to a plurality of terminals and a precoder unit that performs precoding on signals transmitted from the transmission antennas such that received power in the terminals excluding a desired terminal serving as a transmission destination of a transmission signal and IUI terminals, which are the terminals other than the desired terminal, is equal to or smaller than a threshold.
    Type: Application
    Filed: May 26, 2016
    Publication date: April 12, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hiroshi NISHIMOTO, Akinori TAIRA
  • Publication number: 20180069608
    Abstract: A transmitting apparatus according to the present invention includes transmission antennas capable of forming a plurality of beams respectively directed to a plurality of terminals and a precoder unit that performs precoding on signals transmitted from the transmission antennas such that received power in the terminals excluding a desired terminal serving as a transmission destination of a transmission signal and two or more IUI terminals, which are the terminals other than the desired terminal, is equal to or smaller than a threshold.
    Type: Application
    Filed: May 26, 2016
    Publication date: March 8, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hiroshi NISHIMOTO, Akinori TAIRA
  • Patent number: 9706549
    Abstract: A radio communication apparatus includes a FH control unit controlling frequency hopping for changing a frequency channel for each frame, a carrier sense unit performing carrier sense, for each of slots obtained by dividing the frame, a modulating unit determining transmission timing in the slot on the basis of a result of the carrier sense, a successive-transmission control unit generating a plurality of pieces of same data by duplicating transmission data, and a scheduler allocating, for each slot, a different communication time period to each mobile station. The radio communication apparatus transmits, on the basis of an allocation result of the communication time period, the transmission timing, and the instruction by the hopping control unit, the same data generated from same transmission data to the mobile stations in the frames different from each other and notifies the mobile stations of the allocation result.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: July 11, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventor: Akinori Taira
  • Patent number: 9430890
    Abstract: An in-vehicle device stores a Wake Up pattern, which notifies a mobile device of a start of communication, in an area before a data storage area of a frame and transmits the frame, the mobile device includes a modulation/demodulation circuit and a microcomputer that perform a predetermined reception process on a reception signal, a pattern determination circuit that, when the reception signal includes a Wake Up pattern, determines to start communication and activates the modulation/demodulation circuit and the microcomputer, a power detection circuit that detects power of the reception signal, and, when power is detected for a certain period of time or longer, activates the pattern determination circuit, and a Wake-Up control unit that activates the power detection circuit for a predetermined time with a constant period during a time period other than during communication.
    Type: Grant
    Filed: October 10, 2012
    Date of Patent: August 30, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mari Ochiai, Akinori Taira
  • Patent number: 9401736
    Abstract: A radio communication apparatus includes antennas, transceiver units respectively connected to the antennas, and a radio control unit that controls the transceiver units, simultaneously inputs same transmission data to the transceiver units, and instructs, every switching cycle of frequency hopping, the transceiver units to start check processing for an idle state of frequency channels. The transceiver units respectively include hopping control units that switch the frequency channels every fixed time in synchronization with a communication partner and control such that each of the transceiver units uses a different frequency at the same hour. When determining that a frequency channel is in an idle state before a predetermined time elapses from the start of the check processing for an idle state, the transceiver units transmit the transmission data to the communication partner using the frequency channel.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: July 26, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazumasa Suzuki, Hiroyasu Sano, Akinori Taira