Patents by Inventor Hiroshi Nishimoto

Hiroshi Nishimoto 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).

  • Patent number: 11349476
    Abstract: A positive high voltage, a first terminal of a semiconductor element, and a first terminal of a first resistance element are connected to a first terminal of a first current controller. A current input terminal of a first active element is connected to a second terminal of the first current controller, and a second terminal of the semiconductor element and a second terminal of the first resistance element are connected to a control terminal of the first active element. A second resistance element is connected between a current output terminal and a control terminal of the first active element. The first current controller allows a drive current corresponding to an input signal to flow in the first active element and allows the drive current output from the first active element to flow into a load, thereby generating an output voltage.
    Type: Grant
    Filed: December 26, 2018
    Date of Patent: May 31, 2022
    Assignee: HITACHI HIGH-TECH CORPORATION
    Inventors: Yuki Nakamura, Takuma Nishimoto, Hiroshi Touda, Isao Furuya, Suguru Kondo
  • Patent number: 11290312
    Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes: a data-symbol generation unit that generates a data symbol; a symbol arrangement unit that arranges the data symbol and a same-quadrant symbol such that one same-quadrant symbol that becomes a signal point in a same quadrant in a complex plane is inserted per block at a predetermined position in each block signal to generate a block symbol; a CP insertion unit that inserts a Cyclic Prefix into the block symbol; and an interpolation unit that performs interpolation processing on the block symbol on which CP insertion has been performed.
    Type: Grant
    Filed: March 27, 2020
    Date of Patent: March 29, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventors: Fumihiro Hasegawa, Hiroshi Nishimoto, Akihiro Okazaki, Masatsugu Higashinaka
  • Patent number: 11184137
    Abstract: A lower base station according to the present invention includes: a CSI acquisition unit that acquires channel information indicating a channel state between the lower base station and one or more mobile terminals; a lower scheduler unit that transmits the channel information to a higher base station, and determines the number of signal streams and a modulation and coding scheme for a destination terminal that is a mobile terminal selected from among the one or more mobile terminals, based on the destination terminal and a data transmission rate for the destination terminal, sent for notification by the higher base station; and an MU-MIMO signal processing unit that performs Multi User-Multiple Input Multiple Output precoding for the mobile terminal.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: November 23, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroshi Nishimoto, Akinori Taira, Shigeru Uchida
  • Publication number: 20210360507
    Abstract: In a communication system that performs multihop wireless transmission between radio stations arranged at intervals, allocation of a same channel is repeated every odd-number of hops among a plurality of consecutive hops, and reception antennas and transmission antennas for radio signals relayed by the radio stations are installed at such positions that transmission paths of the radio signals have zigzag shapes.
    Type: Application
    Filed: July 27, 2021
    Publication date: November 18, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventor: Hiroshi NISHIMOTO
  • Patent number: 11095700
    Abstract: A management server includes a processor and a storage that stores correlation information in which a category into which content is classified, location information, and an access frequency are correlated with one another. The processor acquires access information on an access from a wireless terminal to a content server via an access point and a network, a content requested by the wireless terminal, and location information corresponding to the accessed access point, updates the correlation information by rewriting the access frequency corresponding to a category to which the requested content belongs and the acquired location information, according to the access information, specifies a category and location information such that an access frequency related to the category and location information in the updated correlation information satisfies a criterion, and stores a content belonging to the category in a cache area of an access point corresponding to the location information.
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: August 17, 2021
    Assignee: TOSHIBA MEMORY CORPORATION
    Inventors: Yuichiro Oyama, Takeshi Ishihara, Hiroshi Nishimoto
  • Publication number: 20210211957
    Abstract: A base station as a transmitter includes: a plurality of antenna units each capable of forming a plurality of beams; a candidate beam grouping unit that performs grouping of each beam formable by the plurality of antenna units, the grouping being performed based on the antenna unit that forms each beam; and a transmission signal generation unit that generates a transmission signal including beam identification information of a beam formed by the plurality of antenna units and group information indicating a group to which the beam belongs, and outputs the transmission signal generated to the antenna unit that forms a beam corresponding to the beam identification information included in the transmission signal.
    Type: Application
    Filed: March 19, 2021
    Publication date: July 8, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kenichiro Kamohara, Fumihiro Hasegawa, Hiroshi Nishimoto
  • Publication number: 20210126757
    Abstract: A lower base station according to the present invention includes: a CSI acquisition unit that acquires channel information indicating a channel state between the lower base station and one or more mobile terminals; a lower scheduler unit that transmits the channel information to a higher base station, and determines the number of signal streams and a modulation and coding scheme for a destination terminal that is a mobile terminal selected from among the one or more mobile terminals, based on the destination terminal and a data transmission rate for the destination terminal, sent for notification by the higher base station; and an MU-MIMO signal processing unit that performs Multi User-Multiple Input Multiple Output precoding for the mobile terminal.
    Type: Application
    Filed: June 27, 2017
    Publication date: April 29, 2021
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroshi NISHIMOTO, Akinori TAIRA, Shigeru UCHIDA
  • Patent number: 10880134
    Abstract: A reception device includes: a reception unit receiving transmission signals; a splitting unit splitting received signals into real component and imaginary component; a narrowing unit narrowing down possible signal point candidates of real component of the signal and imaginary component of the signal to signal point candidates based on the real component and the imaginary component of the split received signal; a signal point candidate hypothesizing unit hypothesizing one signal point candidate of real component from the signal point candidates of real component obtained by narrowing-down and hypothesizing one signal point candidate of imaginary component from the signal point candidates of imaginary component obtained by narrowing-down; and a signal estimation value calculating unit estimating real component of the signal based on the one hypothesized real component signal point candidate and estimating imaginary component of the signal based on the one hypothesized imaginary component signal point candidate
    Type: Grant
    Filed: August 5, 2016
    Date of Patent: December 29, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kanako Yamaguchi, Hiroshi Nishimoto, Kaoru Tsukamoto, Shusaku Umeda
  • Patent number: 10862603
    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: Grant
    Filed: February 22, 2016
    Date of Patent: December 8, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroshi Nishimoto, Hiroki Iura, Akinori Taira
  • Publication number: 20200351016
    Abstract: A reception device according to the present invention includes: a signal division unit; a maximum-likelihood point search unit; a maximum-likelihood point search unit; a replica-vector calculation unit; a replica-vector calculation unit; and a likelihood calculation unit. Wherein, the signal division unit divides a reception signal including a plurality of multiplexed signals respectively into a real component and an imaginary component; the maximum-likelihood point search unit narrows down candidate signal points; the maximum-likelihood point search unit to narrows down candidate signal points; the a replica-vector calculation unit calculates a first replica vector by using the first candidate signal point; the replica-vector calculation unit calculates a second replica vector by using the second candidate signal point; and the likelihood calculation unit calculates a likelihood of the modulation signal by using the first replica vector and the second replica vector.
    Type: Application
    Filed: July 17, 2020
    Publication date: November 5, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kanako YAMAGUCHI, Hiroshi NISHIMOTO, Koji TOMITSUKA
  • Patent number: 10819436
    Abstract: A base station apparatus includes a ground station device and a plurality of ground antenna devices coupled to the ground station device via an optical transmission path. The ground station device performs electrical-optical conversion on an analog electrical signal to be transmitted to a mobile station and a reference clock signal to generate optical signals, performs wavelength division multiplexing on the obtained optical signals to generate a multiplexed optical signal, and outputs the multiplexed optical signal to the optical transmission path.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: October 27, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroshi Nishimoto, Eisuke Haraguchi, Takashi Nishitani
  • Publication number: 20200322192
    Abstract: A reception device includes: a reception unit receiving transmission signals; a splitting unit splitting received signals into real component and imaginary component; a narrowing unit narrowing down possible signal point candidates of real component of the signal and imaginary component of the signal to signal point candidates based on the real component and the imaginary component of the split received signal; a signal point candidate hypothesizing unit hypothesizing one signal point candidate of real component from the signal point candidates of real component obtained by narrowing-down and hypothesizing one signal point candidate of imaginary component from the signal point candidates of imaginary component obtained by narrowing-down; and a signal estimation value calculating unit estimating real component of the signal based on the one hypothesized real component signal point candidate and estimating imaginary component of the signal based on the one hypothesized imaginary component signal point candidate
    Type: Application
    Filed: August 5, 2016
    Publication date: October 8, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kanako YAMAGUCHI, Hiroshi NISHIMOTO, Kaoru TSUKAMOTO, Shusaku UMEDA
  • Patent number: 10764764
    Abstract: A distributed antenna system includes a plurality of antenna groups which includes first antennas and second antennas. The first antennas form beams in a first direction along a mobile station track and transmit identical signals at identical frequencies. The second antennas form beams in a second direction opposite to the first direction and transmit identical signals at identical frequencies. The antenna groups are installed on one side of the mobile station track.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: September 1, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kaoru Tsukamoto, Naohiro Shinoda, Hiroshi Nishimoto
  • Publication number: 20200228378
    Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes: a data-symbol generation unit that generates a data symbol; a symbol arrangement unit that arranges the data symbol and a same-quadrant symbol such that one same-quadrant symbol that becomes a signal point in a same quadrant in a complex plane is inserted per block at a predetermined position in each block signal to generate a block symbol; a CP insertion unit that inserts a Cyclic Prefix into the block symbol; and an interpolation unit that performs interpolation processing on the block symbol on which CP insertion has been performed.
    Type: Application
    Filed: March 27, 2020
    Publication date: July 16, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Fumihiro HASEGAWA, Hiroshi NISHIMOTO, Akihiro OKAZAKI, Masatsugu HIGASHINAKA
  • Patent number: 10644920
    Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes: a data-symbol generation unit that generates a data symbol; a symbol arrangement unit that arranges the data symbol and a same-quadrant symbol such that one same-quadrant symbol that becomes a signal point in a same quadrant in a complex plane is inserted per block at a predetermined position in each block signal to generate a block symbol; a CP insertion unit that inserts a Cyclic Prefix into the block symbol; and an interpolation unit that performs interpolation processing on the block symbol on which CP insertion has been performed.
    Type: Grant
    Filed: February 1, 2018
    Date of Patent: May 5, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Fumihiro Hasegawa, Hiroshi Nishimoto, Akihiro Okazaki, Masatsugu Higashinaka
  • Patent number: 10623068
    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: Grant
    Filed: June 20, 2016
    Date of Patent: April 14, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Akinori Taira, Hiroshi Nishimoto
  • Publication number: 20200112372
    Abstract: A base station apparatus includes a ground station device and a plurality of ground antenna devices coupled to the ground station device via an optical transmission path. The ground station device performs electrical-optical conversion on an analog electrical signal to be transmitted to a mobile station and a reference clock signal to generate optical signals, performs wavelength division multiplexing on the obtained optical signals to generate a multiplexed optical signal, and outputs the multiplexed optical signal to the optical transmission path.
    Type: Application
    Filed: May 23, 2017
    Publication date: April 9, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hiroshi NISHIMOTO, Eisuke HARAGUCHI, Takashi NISHITANI
  • 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
  • Publication number: 20190286348
    Abstract: A storage device includes a storage unit, an interface that is physically connectable to a network, and a controller. The controller is configured to establish a first logical communication path via the interface in a first communication software layer, through which data is read from and stored in the storage unit, and a second logical communication path via the interface in a second communication software layer higher than the first communication software layer, through which meta information for controlling access to the storage unit is communicated.
    Type: Application
    Filed: February 28, 2019
    Publication date: September 19, 2019
    Inventors: Takeshi ISHIHARA, Yuichiro OYAMA, Hiroshi NISHIMOTO, Eimi MURAKAMI
  • Publication number: 20190289053
    Abstract: A management server includes a processor and a storage that stores correlation information in which a category into which content is classified, location information, and an access frequency are correlated with one another. The processor acquires access information on an access from a wireless terminal to a content server via an access point and a network, a content requested by the wireless terminal, and location information corresponding to the accessed access point, updates the correlation information by rewriting the access frequency corresponding to a category to which the requested content belongs and the acquired location information, according to the access information, specifies a category and location information such that an access frequency related to the category and location information in the updated correlation information satisfies a criterion, and stores a content belonging to the category in a cache area of an access point corresponding to the location information.
    Type: Application
    Filed: February 28, 2019
    Publication date: September 19, 2019
    Applicant: TOSHIBA MEMORY CORPORATION
    Inventors: Yuichiro OYAMA, Takeshi ISHIHARA, Hiroshi NISHIMOTO