Patents by Inventor Hiroyuki Shiba

Hiroyuki Shiba 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: 11905425
    Abstract: Provided is an inkjet active-energy-ray-curable composition including a bisphenol-type methacrylate, a low-viscosity monomer, and an inorganic filler.
    Type: Grant
    Filed: March 12, 2022
    Date of Patent: February 20, 2024
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuki Shingai, Hiroyuki Naito, Keisuke Shiba
  • Patent number: 11811143
    Abstract: An OAM multiplexing communication system uses one or more OAM modes and multiplexes signals of one or more sequences for each OAM mode. A transmitting station includes a transmitting antenna using an M-UCA, and an OAM mode generation unit that simultaneously generates one or more OAM modes from each UCA. A receiving station includes a receiving antenna equivalent to the M-UCA, an OAM mode separation unit that separates signals received by each UCA for each OAM mode, and a received signal processing unit that estimates channel information for each OAM mode and performs an equalization process for each OAM mode by using a receiving weight calculated from the channel information. The received signal processing unit is configured to estimate, for each OAM mode, channel information of another OAM mode causing interference and calculate the receiving weight of a subject OAM mode by using the channel information of the subject OAM mode and said another OAM mode.
    Type: Grant
    Filed: March 28, 2019
    Date of Patent: November 7, 2023
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirofumi Sasaki, Doohwan Lee, Hiroyuki Fukumoto, Hiroyuki Shiba
  • Patent number: 11757525
    Abstract: A communication system including a mobile station that communicates with a wireless station and moves toward a predetermined destination, and a relay station that relays communication between the mobile station and the wireless station, includes: the mobile station that pauses movement when sensing an obstacle present on a first moving route toward the destination in a case of moving along the first moving route, and moves along a second moving route headed to the destination while avoiding the obstacle when establishing communication between the mobile station and the wireless station via the relay station in a case where the movement is paused; and the relay station that moves so as to keep a position where communication between the mobile station and the wireless station can be relayed according to movement of the mobile station when the mobile station moves along the second moving route.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: September 12, 2023
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kohei Suzaki, Yusuke Asai, Hiroyuki Shiba
  • Patent number: 11733344
    Abstract: An interference source hunting method of hunting for an interference source of electromagnetic waves while moving between multiple measurement points, includes the steps of acquiring strength information of electromagnetic waves, estimating a distance from the measurement point to the location of the interference source, based on the strength information, calculating a first presence probability that the interference source is present at each position, based on whether a distance from the measurement point to the position is within the distance, updating second presence probabilities acquired in hunting in the past, based on the first presence probabilities, determining a position obtained by moving, by a predetermined distance, the measurement point toward a position with the second presence probability higher than the second presence probability at the measurement point, as a new measurement point, and determining, in a case where a size of an area in which each of the second presence probabilities is great
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: August 22, 2023
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kohei Suzaki, Ryo Miyatake, Yusuke Asai, Hiroyuki Shiba
  • Patent number: 11605181
    Abstract: A control device mounted in a first mobile body that includes a camera and an antenna includes: the camera configured to operate such that a direction of an optical axis of the camera and an oriented direction of the antenna are linked to each other; an identification unit configured to identify a second mobile body through image recognition from a captured image captured by the camera operating; and an antenna control unit configured to control the oriented direction of the antenna such that a position of the identified second mobile body in the captured image is a predetermined position.
    Type: Grant
    Filed: June 5, 2019
    Date of Patent: March 14, 2023
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kohei Suzaki, Yusuke Asai, Hiroyuki Shiba
  • Patent number: 11601823
    Abstract: A mobile station control method by a computer for controlling a first mobile station for communicating with a second mobile station includes: distance detecting of detecting a distance between the first mobile station and the second mobile station; and first switching of switching a beam width of an electromagnetic wave emitted from the first mobile station to the second mobile station switching a beam width of an electromagnetic wave emitted from the first mobile station to the second mobile station the distance.
    Type: Grant
    Filed: June 11, 2019
    Date of Patent: March 7, 2023
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kohei Suzaki, Yusuke Asai, Hiroyuki Shiba
  • Patent number: 11411325
    Abstract: In an OAM multiplexing communication system in which an M-UCA is provided in each of a transmitting station and a receiving station, signals in a plurality of OAM modes are generated and transmitted from each UCA of the transmitting station, signals in the plurality of OAM modes are received and demultiplexed by each UCA of the transmitting station, and streams of the number of UCAs×the number of OAM modes are subjected to spatial multiplex transmission, in which the transmitting station includes a signal processing unit generating the streams to be transmitted in the plurality of OAM modes from each of the UCAs of the M-UCA, and the receiving station includes a signal processing unit receiving the signals in the plurality of OAM modes demultiplexed by each of the UCAs of the M-UCA, and demultiplexes the received signals for each stream from signals in an identical OAM mode.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: August 9, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Doohwan Lee, Hirofumi Sasaki, Hiroyuki Fukumoto, Hiroyuki Shiba
  • Patent number: 11399376
    Abstract: A disclosure relates to a wireless communication system for instructing terminals to control resources based on radio wave conditions. The system comprises: generating, by a base station, information on radio wave conditions based on an uplink wireless signal from terminals, storing learning model data for generating the information on quality of communications with an amount of processing that is equal to or less than a threshold value, selecting learning model data on the basis of known information, and transmitting the learning model data and a downlink wireless signal, receiving, by the terminal, the learning model data, generating information representing the radio wave environment based on the downlink wireless signal, generating information representing quality of communication based on the learning model data and the information representing the radio wave condition, and controlling the communication resource for the wireless signal based on the information representing quality of communication.
    Type: Grant
    Filed: February 13, 2019
    Date of Patent: July 26, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kohei Suzaki, Ryo Miyatake, Yusuke Asai, Hiroyuki Shiba
  • Patent number: 11349583
    Abstract: A measuring robot (1) measures radio waves using a radio wave measuring unit (11) at a measurement point. A self-propelled route control unit (14) controls, in a case that reliability of communication using the radio wave at the measurement point is determined to be low based on one or more of a measurement result by the radio wave measuring unit (11) and information on an obstacle detected by a terrain/obstacle/position detection sensor unit (12), a radio wave measuring unit (11) to measure the radio wave more precisely compared to the measurement of the electromagnetic wave in a case that the reliability of the communication using the radio wave is determined to be high.
    Type: Grant
    Filed: June 5, 2019
    Date of Patent: May 31, 2022
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Ryo Miyatake, Kohei Suzaki, Yusuke Asai, Hiroyuki Shiba
  • Patent number: 11323165
    Abstract: A wireless communication device includes a plurality of antenna elements; a modulation unit modulating signals including data in a plurality of first OAM modes having different real number values; a calculation unit calculating factors indicating weights corresponding to each of the signals in the plurality of first OAM modes modulated by the modulation unit for each of the plurality of antenna elements, based on information indicating a wireless environment of a counter wireless communication device that is a transmission destination of the data; and a transmission processing unit multiplexing each of the signals in the plurality of first OAM modes for each of the plurality of antenna elements by using the factors, and outputting the signals obtained through multiplexing for each of the plurality of antenna elements to each of the plurality of antenna elements.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: May 3, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirofumi Sasaki, Hiroyuki Fukumoto, Doohwan Lee, Hiroyuki Shiba
  • Patent number: 11277214
    Abstract: A synthetic reception strength value in a case of synthesizing indirect waves of radio waves generated due to an obstruction is calculated for each piece of receive antenna coordinate information in consideration of a phase of each indirect wave. Relation information indicating relation between input information and teaching information is generated. The input information is the synthetic reception strength value for each piece of the receive antenna coordinate information corresponding to transmit antenna coordinate information. The teaching information is information indicating a reception state of the radio waves being calculated using a method of actually measuring the radio waves output by the transmit antenna at a position of a receive antenna or a method other than the method of the actual measurement.
    Type: Grant
    Filed: February 13, 2019
    Date of Patent: March 15, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryo Miyatake, Hiroyuki Shiba, Yusuke Asai, Kohei Suzaki
  • Patent number: 11228363
    Abstract: A transmitting station includes a plurality of transmitting weight multiplication units multiplying each of the transmission signal sequences by a transmitting weight, to be converted into MTX signals corresponding to UCAs forming an M-UCA so as to output the converted signals, and MTX transmitting OAM mode generation units inputting the signals corresponding to the UCAs and performing DFT on the input signals, so as to output to the corresponding UCA; and a receiving station includes MRX receiving OAM mode demultiplex units inputting signals from each of the UCAs forming the M-UCA and performing IDFT on the input signals, so as to output by each of received signal sequences, and a plurality of receiving weight multiplication units multiplying for each of them by a receiving weight, so as to demultiplex the spatially multiplexed received signal sequences and to output them in which interference between spatially multiplexed OAM modes is suppressed.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: January 18, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirofumi Sasaki, Hiroyuki Fukumoto, Doohwan Lee, Hiroyuki Shiba
  • Patent number: 11202211
    Abstract: In an OAM multiplexing communication system that subjects a plurality of signal sequences to multiplex transmission by using an OAM mode, a transmitting station includes a transmitting antenna using an M-UCA formed of a plurality of UCAs, and a unit performing basis transformation in each of the rotational direction dimension and a diameter direction dimension in a polar coordinate system having a center of UCAs as an origin, and subjecting the plurality of signal sequences to multiplex transmission for each complex mode formed by a combination of different bases in each dimension. A receiving station includes a receiving antenna using an M-UCA, and a unit receiving a signal subjected to multiplex transmission from the transmitting station, performing basis transformation in each of the rotational direction dimension and the diameter direction dimension by using the received signal, and demultiplexing the plurality of signal sequences subjected to the multiplex transmission.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: December 14, 2021
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirofumi Sasaki, Doohwan Lee, Hiroyuki Fukumoto, Hiroyuki Shiba
  • Publication number: 20210367691
    Abstract: A synthetic reception strength value in a case of synthesizing indirect waves of radio waves generated due to an obstruction is calculated for each piece of receive antenna coordinate information in consideration of a phase of each indirect wave. Relation information indicating relation between input information and teaching information is generated. The input information is the synthetic reception strength value for each piece of the receive antenna coordinate information corresponding to transmit antenna coordinate information. The teaching information is information indicating a reception state of the radio waves being calculated using a method of actually measuring the radio waves output by the transmit antenna at a position of a receive antenna or a method other than the method of the actual measurement.
    Type: Application
    Filed: February 13, 2019
    Publication date: November 25, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryo MIYATAKE, Hiroyuki SHIBA, Yusuke ASAI, Kohei SUZAKI
  • Publication number: 20210328658
    Abstract: A communication system including a mobile station that communicates with a wireless station and moves toward a predetermined destination, and a relay station that relays communication between the mobile station and the wireless station, includes: the mobile station that pauses movement when sensing an obstacle present on a first moving route toward the destination in a case of moving along the first moving route, and moves along a second moving route headed to the destination while avoiding the obstacle when establishing communication between the mobile station and the wireless station via the relay station in a case where the movement is paused; and the relay station that moves so as to keep a position where communication between the mobile station and the wireless station can be relayed according to movement of the mobile station when the mobile station moves along the second moving route.
    Type: Application
    Filed: June 27, 2019
    Publication date: October 21, 2021
    Inventors: Kohei Suzaki, Yusuke Asai, Hiroyuki Shiba
  • Patent number: 11139867
    Abstract: An antenna displacement correction method for an OAM multiplexing communication system includes: a step of estimating a displacement amount by evaluating an evaluation function defined such that a theoretical channel response between a transmitting antenna and a receiving antenna matches a measured channel response estimated in a receiving station by using a known signal transmitted from a transmitting station, wherein the theoretical channel response has, as a parameter, the displacement amount indicating an amount of displacement of a reference axis predefined for each of the transmitting antenna and the receiving antenna from a predetermined position with respect to a desired relative positional relationship between the transmitting antenna and the receiving antenna; and a step of correcting a displacement of each of the transmitting antenna and the receiving antenna according to the estimated displacement amount.
    Type: Grant
    Filed: March 28, 2019
    Date of Patent: October 5, 2021
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirofumi Sasaki, Doohwan Lee, Hiroyuki Fukumoto, Hiroyuki Shiba
  • Publication number: 20210250110
    Abstract: A measuring robot (1) measures radio waves using a radio wave measuring unit (11) at a measurement point.
    Type: Application
    Filed: June 5, 2019
    Publication date: August 12, 2021
    Inventors: Ryo Miyatake, Kohei Suzaki, Yusuke Asai, Hiroyuki Shiba
  • Publication number: 20210239785
    Abstract: An interference source hunting method of hunting for an interference source of electromagnetic waves while moving between multiple measurement points, includes the steps of acquiring strength information of electromagnetic waves, estimating a distance from the measurement point to the location of the interference source, based on the strength information, calculating a first presence probability that the interference source is present at each position, based on whether a distance from the measurement point to the position is within the distance, updating second presence probabilities acquired in hunting in the past, based on the first presence probabilities, determining a position obtained by moving, by a predetermined distance, the measurement point toward a position with the second presence probability higher than the second presence probability at the measurement point, as a new measurement point, and determining, in a case where a size of an area in which each of the second presence probabilities is great
    Type: Application
    Filed: May 21, 2019
    Publication date: August 5, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kohei SUZAKI, Ryo MIYATAKE, Yusuke ASAI, Hiroyuki SHIBA
  • Publication number: 20210211168
    Abstract: A wireless communication device includes a plurality of antenna elements; a modulation unit modulating signals including data in a plurality of first OAM modes having different real number values; a calculation unit calculating factors indicating weights corresponding to each of the signals in the plurality of first OAM modes modulated by the modulation unit for each of the plurality of antenna elements, based on information indicating a wireless environment of a counter wireless communication device that is a transmission destination of the data; and a transmission processing unit multiplexing each of the signals in the plurality of first OAM modes for each of the plurality of antenna elements by using the factors, and outputting the signals obtained through multiplexing for each of the plurality of antenna elements to each of the plurality of antenna elements.
    Type: Application
    Filed: September 25, 2018
    Publication date: July 8, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirofumi SASAKI, Hiroyuki FUKUMOTO, Doohwan LEE, Hiroyuki SHIBA
  • Publication number: 20210160707
    Abstract: A mobile station control method by a computer for controlling a first mobile station for communicating with a second mobile station includes: distance detecting of detecting a distance between the first mobile station and the second mobile station; and first switching of switching a beam width of an electromagnetic wave emitted from the first mobile station to the second mobile station switching a beam width of an electromagnetic wave emitted from the first mobile station to the second mobile station the distance.
    Type: Application
    Filed: June 11, 2019
    Publication date: May 27, 2021
    Inventors: Kohei Suzaki, Yusuke Asai, Hiroyuki Shiba