Patents by Inventor Hiroyasu Sano

Hiroyasu Sano 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: 11336317
    Abstract: A radio communication system according to the present invention is a radio communication system including a transmission device and a reception device, the transmission device includes a first null insertion unit that inserts a first signal that is a signal having an electric power lower than an amplitude of the data symbols, in a time direction of data symbols, and the reception device includes a null extraction unit that extracts a first symbol that is a signal in a period corresponding to the first signal, from a received signal, a signal interpolation unit that interpolates the first symbol to reproduce interference components in periods corresponding to the data symbols, and a subtraction unit that subtracts the interference components from the received signal.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: May 17, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koji Tomitsuka, Masatsugu Higashinaka, Hiroyasu Sano
  • Patent number: 11329859
    Abstract: A transmitter includes: a phase rotation sequence generation unit that generates, on the basis of transmit bits being input, a phase rotation sequence in which a frequency response has a bandwidth; an up-sampling unit that changes a sample rate of the phase rotation sequence and further replicates the phase rotation sequence; and a frequency shift unit that shifts, by a specified amount of shift on a frequency axis, a frequency component of the phase rotation sequence acquired from the up-sampling unit.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: May 10, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masatsugu Higashinaka, Hiroyasu Sano
  • Patent number: 11032782
    Abstract: In a wireless communication system, SINR data are obtained from power measurements data, as follows: gathering first power measurements data of total power received during communications; gathering second power measurements data of in-transmission interference power; computing third power measurements data of useful power, from the first and second power measurements data; gathering fourth power measurements data of out-transmission interference power; merging the second and fourth power measurements data so as to form a set of fifth interference power data; computing a first characteristic function from the third power measurements data, and computing a second characteristic function from the fifth power measurements data; building a third characteristic function relating to the SINR data related to the transmission channel, by performing a term-by-term product of the first and second characteristic functions; computing a probability mass function from the third characteristic function.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: June 8, 2021
    Assignees: MITSUBISHI ELECTRIC CORPORATION, MITSUBISHI ELECTRIC R&D CENTRE EUROPE B.V
    Inventors: Nicolas Gresset, Hiroyasu Sano, Kazumasa Suzuki
  • Publication number: 20210135698
    Abstract: A radio communication system according to the present invention is a radio communication system including a transmission device and a reception device, the transmission device includes a first null insertion unit that inserts a first signal that is a signal having an electric power lower than an amplitude of the data symbols, in a time direction of data symbols, and the reception device includes a null extraction unit that extracts a first symbol that is a signal in a period corresponding to the first signal, from a received signal, a signal interpolation unit that interpolates the first symbol to reproduce interference components in periods corresponding to the data symbols, and a subtraction unit that subtracts the interference components from the received signal.
    Type: Application
    Filed: February 27, 2018
    Publication date: May 6, 2021
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Koji TOMITSUKA, Masatsugu HIGASHINAKA, Hiroyasu SANO
  • Patent number: 10938467
    Abstract: A transmitting station includes a transmitting antenna whose orientation direction is changeable, and a controller that controls the orientation direction of the transmitting antenna according to an orientation direction of the transmitting antenna determined together with receiving stations to receive data transmitted from the transmitting antenna based on estimate values of received signal quality at receiving stations that are candidates for receiving stations to receive data transmitted from the transmitting antenna. The transmitting station can maintain received signal quality at a plurality of receiving stations at a desired value or more in a data transmission system.
    Type: Grant
    Filed: April 30, 2015
    Date of Patent: March 2, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shigenori Tani, Hiroyasu Sano, Katsuyuki Motoyoshi, Akinori Fujimura, Futaba Ejima, Kyoichiro Izumi
  • Publication number: 20200403841
    Abstract: A transmitter includes: a phase rotation sequence generation unit that generates, on the basis of transmit bits being input, a phase rotation sequence in which a frequency response has a bandwidth; an up-sampling unit that changes a sample rate of the phase rotation sequence and further replicates the phase rotation sequence; and a frequency shift unit that shifts, by a specified amount of shift on a frequency axis, a frequency component of the phase rotation sequence acquired from the up-sampling unit.
    Type: Application
    Filed: February 27, 2018
    Publication date: December 24, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masatsugu HIGASHINAKA, Hiroyasu SANO
  • Publication number: 20200382168
    Abstract: A wireless communication system includes: base stations that are a plurality of transmission devices that transmits signals including different known sequences using a same frequency; and a mobile station that is a reception device that performs channel estimation using a reception signal received from at least one of the plurality of transmission devices, an average time parameter, and at least one of a plurality of the known sequences corresponding to the plurality of transmission devices, and removes an interference signal included in the reception signal using a result of the channel estimation, the average time parameter being a parameter related to channel estimation accuracy and determined based on a moving speed of a moving one of the reception device that receives the reception signal and the transmission devices that transmits the reception signal.
    Type: Application
    Filed: August 14, 2020
    Publication date: December 3, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Satoshi SASAKI, Akinori NAKAJIMA, Shinji MASUDA, Hiroyasu SANO
  • Patent number: 10812134
    Abstract: 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: Grant
    Filed: July 19, 2017
    Date of Patent: October 20, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazumasa Suzuki, Kazuaki Ishioka, Hiroyasu Sano
  • Patent number: 10686514
    Abstract: A wireless receiving device includes a signal measurement unit; a weighting factor generation unit that generates weighting factors each for suppression of the received signals, based on measurement results of the received signals; interference suppression units that each perform, in a parallel manner, interference suppression processing on the received signals, using, one of the weighting factors; arrival detection units that are connected in one-to-one to the interference suppression units, the arrival detection units each detecting arrival of a desired signal; an arrival determination unit that determines whether the desired signal has arrived; and a demodulation processing unit that demodulates the received signals when the arrival determination unit determines that the desired signal has arrived.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: June 16, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shusaku Umeda, Kazumasa Suzuki, Hiroyasu Sano
  • Publication number: 20200186187
    Abstract: 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: Application
    Filed: July 19, 2017
    Publication date: June 11, 2020
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazumasa SUZUKI, Kazuaki ISHIOKA, Hiroyasu SANO
  • Publication number: 20200127765
    Abstract: A transmitter according to the present invention includes: a mapping unit that generates modulation symbols by modulating a transmission bit sequence; a DSTBC coding unit that generates coded symbols by performing differential space-time block coding on the modulation symbols; a code conversion unit that performs, on the coded symbols, a conversion process selected from among a plurality of conversion processes; and an antenna that transmits the coded symbols after the conversion process.
    Type: Application
    Filed: May 10, 2017
    Publication date: April 23, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Satoshi SASAKI, Hiroyasu SANO, Shinji MASUDA
  • Publication number: 20200120614
    Abstract: In a wireless communication system, SINR data are obtained from power measurements data, as follows: gathering first power measurements data of total power received during communications; gathering second power measurements data of in-transmission interference power; computing third power measurements data of useful power, from the first and second power measurements data; gathering fourth power measurements data of out-transmission interference power; merging the second and fourth power measurements data so as to form a set of fifth interference power data; computing a first characteristic function from the third power measurements data, and computing a second characteristic function from the fifth power measurements data; building a third characteristic function relating to the SINR data related to the transmission channel, by performing a term-by-term product of the first and second characteristic functions; computing a probability mass function from the third characteristic function.
    Type: Application
    Filed: February 28, 2018
    Publication date: April 16, 2020
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Nicolas GRESSET, Hiroyasu SANO, Kazumasa SUZUKI
  • Patent number: 10498471
    Abstract: A radio wave monitoring apparatus includes a communication quality evaluation unit which notifies degradation of communication quality of wireless communication when a non-transmission probability exceeds a threshold, the non-transmission probability having been calculated based on measurement results of communication quality of wireless communication between an on-board station mounted on a train traveling on a track and ground stations installed along the track, and a condition by which it is determined that transmission information is unreachable in the wireless communication.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: December 3, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazumasa Suzuki, Hiroyasu Sano
  • Publication number: 20190229797
    Abstract: A wireless receiving device includes a signal measurement unit that measures received signals; a weighting factor generation unit that generates weighting factors each for suppression of the received signals, based on measurement results of the received signals; interference suppression units that each perform, in a parallel manner, interference suppression processing on the received signals, using one of the weighting factors, the one weighting factor used by one of the interference suppression units being different from weighting factors used by other interference suppression units, the plurality of weighting factors being generated at different points of time; arrival detection units that are connected in one-to-one to the interference suppression units, the arrival detection units each detecting arrival of a desired signal, using received signals that have been subjected to the interference suppression processing in the corresponding interference suppression unit connected thereto; an arrival determinatio
    Type: Application
    Filed: September 15, 2016
    Publication date: July 25, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shusaku UMEDA, Kazumasa SUZUKI, Hiroyasu SANO
  • Patent number: 10211912
    Abstract: In a satellite communication system to relay communication between a terminal and a gateway installed on the ground through a satellite repeater, the satellite repeater forms a user link beam for communicating with the terminal and a feeder link beam for communicating with the gateway in a same area, and changes frequency or polarization association with respect to each of the user link beam and the feeder link beam, based on a traffic situation. Thus, a capacity that can be communicated by the beam may be changed after satellite launching.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: February 19, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shigenori Tani, Katsuyuki Motoyoshi, Hiroyasu Sano
  • Publication number: 20190028214
    Abstract: A radio wave monitoring apparatus includes a communication quality evaluation unit which notifies degradation of communication quality of wireless communication when a non-transmission probability exceeds a threshold, the non-transmission probability having been calculated based on measurement results of communication quality of wireless communication between an on-board station mounted on a train traveling on a track and ground stations installed along the track, and a condition by which it is determined that transmission information is unreachable in the wireless communication.
    Type: Application
    Filed: January 27, 2016
    Publication date: January 24, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazumasa Suzuki, Hiroyasu Sano
  • Patent number: 10009155
    Abstract: For determining time and frequency resources, a first device performs: obtaining groups of time and frequency resources of the wireless communications network so as to form a redrawn grid; allocating time and frequency resources according to the redrawn grid and to a frequency hopping criteria; and providing signalling information representative of the time and frequency resources that have been allocated according to the redrawn grid. In order to determine which time and frequency resources of the initial grid to be used for performing said transmissions, a second device performs: obtaining the signalling information so as to determine the time and frequency resources that have been allocated according to the redrawn grid; and applying a predetermined pattern mask onto the determined time and frequency resources that have been allocated according to the redrawn grid.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: June 26, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Nicolas Gresset, Loic Brunel, Hiroyasu Sano, Kazumasa Suzuki
  • Publication number: 20180145740
    Abstract: A transmitting station includes a transmitting antenna whose orientation direction is changeable, and a controller that controls the orientation direction of the transmitting antenna according to an orientation direction of the transmitting antenna determined together with receiving stations to receive data transmitted from the transmitting antenna based on estimate values of received signal quality at receiving stations that are candidates for receiving stations to receive data transmitted from the transmitting antenna. The transmitting station can maintain received signal quality at a plurality of receiving stations at a desired value or more in a data transmission system.
    Type: Application
    Filed: April 30, 2015
    Publication date: May 24, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shigenori TANI, Hiroyasu SANO, Katsuyuki MOTOYOSHI, Akinori FUJIMURA, Futaba EJIMA, Kyoichiro IZUMI
  • Publication number: 20170026153
    Abstract: For determining time and frequency resources, a first device performs: obtaining groups of time and frequency resources of the wireless communications network so as to form a redrawn grid; allocating time and frequency resources according to the redrawn grid and to a frequency hopping criteria; and providing signalling information representative of the time and frequency resources that have been allocated according to the redrawn grid. In order to determine which time and frequency resources of the initial grid to be used for performing said transmissions, a second device performs: obtaining the signalling information so as to determine the time and frequency resources that have been allocated according to the redrawn grid; and applying a predetermined pattern mask onto the determined time and frequency resources that have been allocated according to the redrawn grid.
    Type: Application
    Filed: December 19, 2014
    Publication date: January 26, 2017
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Nicolas GRESSET, Loic BRUNEL, Hiroyasu SANO, Kazumasa SUZUKI
  • Publication number: 20160352413
    Abstract: In a satellite communication system to relay communication between a terminal and a gateway installed on the ground through a satellite repeater, the satellite repeater forms a user link beam for communicating with the terminal and a feeder link beam for communicating with the gateway in a same area, and changes frequency or polarization association with respect to each of the user link beam and the feeder link beam, based on a traffic situation. Thus, a capacity that can be communicated by the beam may be changed after satellite launching.
    Type: Application
    Filed: December 17, 2014
    Publication date: December 1, 2016
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shigenori TANI, Katsuyuki MOTOYOSHI, Hiroyasu SANO