Patents by Inventor Kenji WAKAFUJI

Kenji WAKAFUJI 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: 20240429945
    Abstract: In one aspect of the present example embodiment, a modulation control apparatus includes at least one memory configured to store an instruction, and at least one processor configured to execute the instruction, wherein the processor, by executing the instruction, acquires data relating to a temperature during a predetermined period, and sets signal point arrangement used for modulation of a transmission signal in such a way that the signal point arrangement used for modulation of the transmission signal is switched to different signal point arrangement during the predetermined period, based on the data relating to the temperature.
    Type: Application
    Filed: June 5, 2024
    Publication date: December 26, 2024
    Applicant: NEC Corporation
    Inventors: Kenji WAKAFUJI, Kohei YOSHIDA
  • Publication number: 20240405429
    Abstract: An antenna element receives a first radio wave and outputs a transmission signal, and receives a second radio wave and outputs a reception signal. A phase conversion unit applies a predetermined phase shift amount to a signal to be input and then output the signal. A switch connects the antenna element to one of the phase conversion unit and external receiver. When the first radio wave enters the antenna, the switch connects the antenna element to the phase conversion unit, and the transmission signal to which the predetermined phase shift amount has been applied is radiated from the antenna element. A third radio wave radiated from each of a plurality of RIS elements is deflected in a predetermined direction. When the second radio wave enters the antenna, the switch connects the antenna element to the external receiver, and the external receiver receives the reception signal.
    Type: Application
    Filed: May 7, 2024
    Publication date: December 5, 2024
    Applicant: NEC Corporation
    Inventors: Shingo WATANABE, Masakazu ONO, Kenji WAKAFUJI, Kohei YOSHIDA
  • Publication number: 20240302539
    Abstract: A positioning method of the present disclosure includes: generating first observation data through observation of phases of a plurality of carrier waves transmitted from a plurality of transmitting stations in a first satellite; generating second observation data through observation of the phases of the plurality of the carrier waves in a second satellite; performing phase difference calculation to calculate a phase difference of the plurality of the carrier waves observed in the first satellite and the second satellite using the first observation data and the second observation data; performing base line vector calculation to calculate a base line vector indicating relative positions of the first satellite and the second satellite based on the phase difference calculated by performing the phase difference calculation; and performing the phase difference calculation and the base line vector calculation by either one of the second satellite or a positioning apparatus located on the ground.
    Type: Application
    Filed: January 14, 2022
    Publication date: September 12, 2024
    Inventors: Koya Takata, Kenji WAKAFUJI, Masahiro KAIDEN
  • Publication number: 20240214972
    Abstract: A communication control system includes at least one processor, and the at least one processor carries out: a predicting process of making predictions of a future status of communication of a communication system in a plurality of stages; and a controlling process of performing control of the communication system, the control being based on a result of a prediction in each of the plurality of stages, and in the controlling process, the at least one processor determines, in accordance with the result of the prediction in one of the plurality of stages, whether it is necessary to move the air vehicle and controls the air vehicle.
    Type: Application
    Filed: December 20, 2023
    Publication date: June 27, 2024
    Applicant: NEC Corporation
    Inventors: Kazuyuki HAYASHI, Masakazu Ono, Junichi Funada, Kenji Wakafuji, Kohei Yoshida
  • Publication number: 20240213671
    Abstract: A transmission apparatus according to one aspect of the present disclosure includes an antenna that emits a radio wave to space, a reflector that reflects a radio wave emitted from the antenna, and a reconfigurable intelligent surface (RIS) reflecting plate that reflects a radio wave from the reflector and thereby transmits the reflected radio wave to a transmission target.
    Type: Application
    Filed: December 14, 2023
    Publication date: June 27, 2024
    Applicant: NEC Corporation
    Inventors: Shingo Watanabe, Kenji Wakafuji, Masakazu Ono
  • Publication number: 20240214831
    Abstract: A communication control apparatus which controls communication between a plurality of communication terminals each located in any one of a plurality of areas and a plurality of base station includes at least one processor, the at least one processor carrying out a control process in which a directivity direction of each of antennas of the plurality of communication terminals is determined, on the basis of: terminal location prediction information in which locations of the plurality of communication terminals are predicted; and an electric wave environment database in which the plurality of base stations, beam directions of respective electric waves from the base stations, the plurality of areas, and reception powers of the respective electric waves in the plurality of areas are associated with each other.
    Type: Application
    Filed: December 19, 2023
    Publication date: June 27, 2024
    Applicant: NEC Corporation
    Inventors: Kohei Yoshida, Masakazu Ono, Junichi Funada, Kenji Wakafuji, Shingo Watanabe, Kazushi Sugyo, Kazuyuki Hayashi
  • Publication number: 20240210523
    Abstract: An amplifier amplifies an input signal. A radiation unit radiates a radio wave into space, based on the input signal amplified by the amplifier. A first reflection unit reflects the radio wave radiated from the radiation unit. A second reflection unit configured as a reconfigurable intelligent metasurface (RIS) reflecting plate reflects the radio wave from the first reflection unit and thereby transmits the radio wave to a transmission target. A control unit controls the second reflection unit. The second reflection unit reflects the radio wave at a target reflection angle that represents a reflection angle toward the transmission target, by reflecting the radio wave at a reflection angle acquired by adding an offset to a reflection angle specified by the control unit, based on the target reflection angle.
    Type: Application
    Filed: December 18, 2023
    Publication date: June 27, 2024
    Applicant: NEC Corporation
    Inventors: Shingo WATANABE, Masakazu Ono, Kenji Wakafuji
  • Publication number: 20240214045
    Abstract: To provide a communication terminal apparatus, a communication satellite apparatus, and a satellite communication system, capable of facilitating rapid determination of the direction of a beam. A communication terminal apparatus (10) is a communication terminal apparatus configured to communicate with a communication satellite apparatus (20) by means of a radio beam, the apparatus including: an antenna (11) configured to receive a plurality of beacons (Fa1 to Fa3) from at least one communication satellite apparatus, and to transmit and receive a directional radio beam; and at least one processor executing a control process of determining a plurality of candidate directions of the radio beam to be transmitted, on the basis of information included in the plurality of beacons.
    Type: Application
    Filed: December 20, 2023
    Publication date: June 27, 2024
    Applicant: NEC Corporation
    Inventors: Kazushi SUGYO, Shingo WATANABE, Kenji WAKAFUJI, Masakazu ONO
  • Publication number: 20240187171
    Abstract: A communication apparatus according to the present disclosure includes a receiver configured to receive upward data being transmitted from a terminal during an upward period from a terminal transmission start time to a terminal transmission end time in an upward slot, during an own apparatus reception period being equal in length to the upward period from an own apparatus reception start time being later than the terminal transmission start time by a propagation delay time; and a transmitter configured to transmit downward data during an own apparatus transmission period being equal in length to a downward period from an own apparatus transmission start time being earlier than a terminal reception start time by the propagation delay time, in such a way that the terminal receives the downward data during the downward period from the terminal reception start time to a terminal reception end time in a downward slot.
    Type: Application
    Filed: December 1, 2023
    Publication date: June 6, 2024
    Applicant: NEC Corporation
    Inventors: Shingo WATANABE, Kenji WAKAFUJI, Masakazu ONO
  • Publication number: 20240178576
    Abstract: Provided is an antenna device including an antenna array including a plurality of patch antennas arrayed in a grid, a first switch group including a first switch disposed on a wiring line connecting two adjacent patch antennas, and a second switch group including a second switch disposed on a wiring line between an antenna assembly formed by at least four adjacent patch antennas and a signal source connected to at least one patch antenna constituting the antenna assembly.
    Type: Application
    Filed: November 22, 2023
    Publication date: May 30, 2024
    Applicant: NEC Corporation
    Inventors: Ryota NIHEI, Junichi FUNADA, Kenji WAKAFUJI, Kazuyuki HAYASHI, Kohei YOSHIDA, Shingo WATANABE, Kazushi SUGYO, Masakazu ONO, FUJIO OKUMURA
  • Publication number: 20240176439
    Abstract: Provided is a display antenna including a display including a plurality of light emitters arranged in a grid, an antenna array having an antenna assembly in which a plurality of patch antennas through which light in a wavelength band of a visible region is transmitted is disposed in a grid, the antenna array being disposed to be superimposed on the display, and a phase shifter disposed in a gap region sandwiched between the plurality of light emitters, connected to at least one of the plurality of patch antennas, and configured to shift a signal to be transmitted and received.
    Type: Application
    Filed: November 22, 2023
    Publication date: May 30, 2024
    Applicant: NEC Corporation
    Inventors: Ryota NIHEI, Junichi FUNADA, Kenji WAKAFUJI, Kazuyuki HAYASHI, Kohei YOSHIDA, Shingo WATANABE, Kazushi SUGYO, Masakazu ONO, Fujio OKUMURA
  • Publication number: 20240146405
    Abstract: A control apparatus capable of exhibiting the diversity effect in a hybrid mobile communication system using a terrestrial communication apparatus and a non-terrestrial communication apparatus is provided.
    Type: Application
    Filed: October 13, 2023
    Publication date: May 2, 2024
    Applicant: NEC Corporation
    Inventors: Kenji WAKAFUJI, Junichi FUNADA, Kohei YOSHIDA, Masakazu ONO, Kazuyuki HAYASHI
  • Publication number: 20240145923
    Abstract: A display board (101) configured to include a first display element (102A) that displays a first pixel that is one pixel of a screen of the touch panel and a second display element (102B) that displays a second pixel that is other one pixel of the screen; a touch sensor (106, 201, 203) configured to detect contact with the screen; a planar antenna (105) configured to be provided at a position on a front surface side of the screen with respect to the display board and the touch sensor, the position not facing the first display element and the second display element when viewed from above the screen; and a control unit configured to communicate to the planar antenna via a space between the first display element and the second display element.
    Type: Application
    Filed: December 10, 2021
    Publication date: May 2, 2024
    Applicant: NEC Corporation
    Inventors: Koya Takata, Kenji Wakafuji, Fujio Okumura
  • Publication number: 20240146400
    Abstract: At least one processor included in a server carries out: an acquiring process of acquiring, from a communication terminal configured to communicate with low earth orbit satellite equipment, information which indicates a communication condition in the communication terminal regarding communication with the low earth orbit satellite equipment; and a controlling process of referring to a radio wave map of a region including a location of the communication terminal and the information, to control an air vehicle configured to measure an attenuation of a radio wave between the air vehicle and the communication terminal.
    Type: Application
    Filed: October 19, 2023
    Publication date: May 2, 2024
    Applicant: NEC Corporation
    Inventors: Kazuyuki HAYASHI, Masakazu Ono, Junichi Funada, Kenji Wakafuji, Kohei Yoshida
  • Publication number: 20240106109
    Abstract: Please delete the Abstract of the Disclosure, and replace it with the following: Provided are a liquid crystal antenna capable of adapting a transmission/reception direction of a radio wave to 360° in a horizontal direction and reducing a size, a weight, and cost, and a method for manufacturing the liquid crystal antenna. A liquid crystal antenna of the present example embodiment includes a curved liquid crystal panel and is a phased array type, and the liquid crystal panel includes a liquid crystal layer and a plurality of antenna elements that transmit and receive signals having phases modulated by a variable dielectric constant element including the liquid crystal layer. The liquid crystal layer may be curved.
    Type: Application
    Filed: December 10, 2021
    Publication date: March 28, 2024
    Applicant: NEC Corporation
    Inventors: Koya TAKATA, Kenji WAKAFUJI, Fujio OKUMURA
  • Publication number: 20240103169
    Abstract: an LEO satellite includes a light projecting element that emits emission light to another LEO satellite, an optical telescope, an optical phased array, a light receiving element that receives incident light from the other LEO satellite, a distance measurement unit that measures a distance to the other LEO satellite based on at least one of the emission light and the incident light, and a control unit. The control unit captures the other LEO satellites by scanning emission light using the optical telescope and receives incident light from the other LEO satellites for the other LEO satellites on the same orbital plane, and captures the other LEO satellites by scanning emission light using the optical phased array and receives incident light from the other LEO satellites for the other LEO satellites on different orbital planes.
    Type: Application
    Filed: January 13, 2022
    Publication date: March 28, 2024
    Applicant: NEC Corporation
    Inventors: Koya TAKATA, Masahiro KAIDEN, Kenji WAKAFUJI
  • Publication number: 20240088981
    Abstract: A ground base station (10) and a high-altitude base station (20) perform transmission beam sweeping in an orientation of a terminal (30). The terminal (30) performs reception beam sweeping in an orientation of the ground base station (10) only for a time determined in advance and, when the terminal (30) is able to find the ground base station (10), the terminal (30) connects to the ground base station (10). When the terminal (30) is unable to find the ground base station (10), the terminal (30) starts reception beam sweeping in an orientation of the high-altitude base station (20) and, when the terminal (30) is able to find the high-altitude base station (20), the terminal (30) connects to the high-altitude base station (20).
    Type: Application
    Filed: January 14, 2022
    Publication date: March 14, 2024
    Applicant: NEC Corporation
    Inventor: Kenji Wakafuji
  • Publication number: 20240088569
    Abstract: To provide an antenna capable of accelerating beamforming. The antenna includes a metasurface with an opening part that receives electromagnetic waves and a MEMS mechanism configured to change a shape of the opening part by operating a moveable member with respect to the opening part of the metasurface.
    Type: Application
    Filed: February 3, 2022
    Publication date: March 14, 2024
    Applicant: NEC Corporation
    Inventors: Koya TAKATA, Kenji WAKAFUJI, Fujio OKUMURA
  • Patent number: 10779132
    Abstract: A processor (103) in a wireless terminal (10) executes a communication service application to thereby perform an operation as a client for using a communication service. Further, in an abnormal situation where the wireless terminal (10) cannot access a server system (50) of an operator of the communication service, the processor (103) executes a predetermined activation procedure in the wireless terminal (10) without passing through the server system (50) to thereby activate a special account in the wireless terminal (10). This makes it possible, for example, to perform communication by the special account using an online service application installed in the wireless terminal during an abnormal situation where the wireless terminal cannot access the online service server.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: September 15, 2020
    Assignee: NEC CORPORATION
    Inventors: Shingo Watanabe, Shigeru Asai, Hideto Shibouta, Kenji Wakafuji, Masakazu Ono, Masato Kudou
  • Patent number: 10708820
    Abstract: A node in a DTN includes: a memory; and a processor coupled to the memory and configured to execute data transfer processing for the DTN, wherein the data transfer processing including: receiving a plurality of bundles to be transferred to a same destination node on the DTN, each of the plurality of bundles including any one of a plurality of data segments acquired by dividing data of a content; deleting a part of the bundles from among the plurality of bundles without transferring to any other node or compressing a data size of a payload of the part of the bundles in accordance with a communication status of the DTN; and transmitting either a rest of the bundles excluding the deleted part of the bundles or the plurality of bundles including the part of the bundles having the compressed payloads to the DTN for transmitting to the destination node.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: July 7, 2020
    Assignee: NEC CORPORATION
    Inventors: Masakazu Ono, Shigeru Asai, Kenji Wakafuji, Hideto Shibohta, Shingo Watanabe, Masato Kudou