Patents by Inventor Mizuki SUGA
Mizuki SUGA 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).
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Publication number: 20240413905Abstract: An aspect of the present invention is a wireless communication system including an accommodation station device and a base station device connected to the accommodation station device through an optical transmission path and having n (n is an integer of 2 or more) antenna elements, wherein a plurality of optical signals having different wavelengths propagate through the optical transmission path, the wireless communication system including a prior information acquisition unit configured to execute prior information acquisition processing for acquiring, as prior information, dispersion phase difference information that is information including a dispersion phase difference that is a phase rotation amount difference generated between adjacent optical signals on a wavelength axis due to propagation of the optical signals through the optical transmission path, and a compensation phase shift unit configured to execute compensation phase shift processing for reducing a difference from a phase difference reference tType: ApplicationFiled: February 12, 2021Publication date: December 12, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Mizuki SUGA, Kota ITO, Takuto ARAI, Yushi SHIRATO, Naoki KITA
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Publication number: 20240405910Abstract: A wireless communication method wherein among a signal processing function and a communication function provided by a wireless communication device, a centralized unit having a signal processing function transmits an optical signal having a form corresponding to a downstream radio signal to be a transmission target in the communication function, to a communication target radio unit which communicates with an external communication device among two or more radio units having a communication function connected to the centralized unit via an optical fiber, and performs beam forming control of the communication target radio unit, and the communication target radio unit, according to control of the centralized unit, communicates with the external communication device.Type: ApplicationFiled: January 27, 2021Publication date: December 5, 2024Applicants: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Takuto ARAI, Yushi SHIRATO, Daisei UCHIDA, Naoki KITA, Takeshi ONIZAWA
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Patent number: 12160268Abstract: A communication system includes a central station device and a base station device. The central station device includes: a plurality of signal processing units, each generating an electrical signal of a wireless signal by performing signal processing corresponding to a wireless system; a conversion unit that generates an optical signal by performing intensity modulation on the electrical signal; and a signal processing control unit that controls the conversion unit to generate an optical signal in which a plurality of the electrical signals are multiplexed. The base station device includes: an electrical signal generation unit that receives the optical signal generated in the central station device via an optical transmission path and converts the received optical signal into a plurality of electrical signals; and a plurality of antenna devices, each wirelessly transmitting the wireless signal according to the electrical signal generated by the electrical signal generation unit.Type: GrantFiled: June 25, 2020Date of Patent: December 3, 2024Assignee: Nippon Telegraph and Telephone CorporationInventors: Kota Ito, Mizuki Suga, Yushi Shirato, Naoki Kita
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Publication number: 20240372611Abstract: According to one aspect of the present invention, there is provided a radio communication device that performs communication with a terminal-side communication device having an antenna using an analog signal for transmitting information by a waveform of an amplitude or a phase of light to receive a signal received by the antenna and transmit a signal radiated by the antenna, the terminal-side communication device and the radio communication device being included in a radio communication system that performs radio communication with a communication target terminal via the antenna using time division duplex (TDD), the radio communication device including: an uplink delay adjustment unit configured to adjust a delay caused by propagation of an uplink signal that is a signal flowing from the terminal to the radio communication device via the antenna; and a downlink delay adjustment unit configured to adjust a delay caused by propagation of a downlink signal that is a signal flowing from the radio communication deType: ApplicationFiled: August 5, 2021Publication date: November 7, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Takuto ARAI, Hideki TOSHINAGA, Naoki KITA, Yushi SHIRATO, Daisei UCHIDA, Mizuki SUGA, Kota ITO
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Publication number: 20240275491Abstract: A wireless communication method in a wireless communication system including an exchange device and a base station device configured to perform beamforming according to the control of the exchange device, in which: the exchange device performs beamforming control of the base station device by transmitting an optically modulated signal to the base station device via an optical transmission line, the optically modulated signal being generated by modulating an intensity of an optical signal on a basis of a transmission signal to be transmitted by controlling any combination of an optical wavelength, a frequency, and an optical polarization or controlling the frequency; and the base station device inputs an electrical signal based on the optically modulated signal to a beamforming circuit having an input port corresponding to the number of combinations of the optical wavelength, the frequency, and the optical polarization or the number of frequencies to perform beamforming in a direction corresponding to the inpuType: ApplicationFiled: May 17, 2021Publication date: August 15, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Takuto ARAI, Yushi SHIRATO, Naoki KITA
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Publication number: 20240267122Abstract: A wireless communication method in a wireless communication system including an accommodation station device and a base station device that performs beam formation according to control of the accommodation station device, includes: transmitting an optical modulation signal generated by performing intensity modulation on an optical signal on the basis of a transmission signal to be transmitted to the base station device via an optical transmission line by the accommodation station device controlling any combination of a light wavelength, a frequency, or an optical polarized wave, or a plurality of frequencies or a plurality of light wavelengths, to perform beamforming control of the base station device; transmitting the optical modulation signal after dispersion compensation is performed in an electrical domain or an optical domain in the accommodation station device or performing dispersion compensation on the optical modulation signal on the optical transmission line; and inputting, by the base station devicType: ApplicationFiled: June 23, 2021Publication date: August 8, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Takuto ARAI, Yushi SHIRATO, Naoki KITA
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Publication number: 20240259098Abstract: A wireless communication method in a wireless communication system including an exchange device and a base station device that performs beamforming according to the control of the exchange device, in which: the exchange device performs beamforming control of the base station device by transmitting an optically modulated signal to the base station device via an optical transmission line, the optically modulated signal being generated by modulating an intensity of an optical signal on a basis of a transmission signal to be transmitted by controlling any combination of an optical wavelength, a frequency, and an optical polarization or controlling the frequency; and the base station device performs beamforming in a direction in which a wireless signal radiated from an antenna to which an electrical signal based on the optically modulated signal has been input is reflected by a reflector or is transmitted through a lens among antennas corresponding to the number of combinations of the optical wavelength, the frequType: ApplicationFiled: May 17, 2021Publication date: August 1, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Takuto ARAI, Yushi SHIRATO, Naoki KITA
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Patent number: 12052679Abstract: An AP 3 and STAs 5 acquire time information from an external device, and synchronize time. The AP 3 sets, in a first signal, a transmission start time of the first signal, and transmits the first signal to the STA 5. The STAs 5 transmit, to the AP 3, a second signal in which a delay time is set, the delay time being calculated from a difference between the transmission start time acquired from the first signal and a reception start time of the first signal at the own station. The AP 3 acquires delay time from the second signal of each STA 5, decides a timing for permitting transmission by each of the STAs 5 by time division, on the basis of the acquired delay time, and notifies the STAs 5 thereof. The STAs 5 each effect control to start transmission of signals to the AP 3 at the timing notified from the AP 3.Type: GrantFiled: December 12, 2019Date of Patent: July 30, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Mizuki Suga, Nobuaki Otsuki, Kota Ito, Naoki Kita
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Patent number: 12009862Abstract: An accommodation station transmission unit modulates light to generate an optical signal based on an RF signal and outputs the generated optical signal, a base station transmission unit obtains the optical signal from an input port, demultiplexes the obtained optical signal for each wavelength, outputs the demultiplexed optical signals from output ports of corresponding wavelengths from among a plurality of output ports allocated to each of the wavelengths of the light, and demodulates the RF signal by converting the optical signals output by the output ports into electrical signals, a plurality of transmission antennas emit the demodulated RF signal, and a reflect array or a transmit array receives the RF signal emitted by each of the transmission antennas and forms a transmission beam in a different direction for each position of the transmission antenna that is a transmission source of the RF signal for each RF signal.Type: GrantFiled: November 25, 2019Date of Patent: June 11, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota Ito, Mizuki Suga, Yushi Shirato, Naoki Kita
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Patent number: 11974312Abstract: An allocation method for allocating individual downlink data signals to positions on a time axis when a base station transmits the individual downlink data signals to a plurality of terminal stations. The allocation method includes provisionally allocating individual downlink data signals of the individual downlink data signals for terminal stations having long propagation delay times to positions of relatively early timings and provisionally allocating individual downlink data signals of the individual downlink data signal for terminal stations having short propagation delay times to positions of relatively late timings, changing the positions such that, when it is estimated that a collision will occur when receiving response signals transmitted from the terminal stations, it is estimated that a collision will not occur, in the provisionally allocating, and fixing, as the positions of the individual downlink data signals on the time axis, the positions changed in the changing of the positions.Type: GrantFiled: January 31, 2020Date of Patent: April 30, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kazuto Goto, Hideki Toshinaga, Yushi Shirato, Mizuki Suga, Kota Ito, Naoki Kita
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Patent number: 11936429Abstract: An accommodation station transmission unit modulates light based on an RF signal to generate an optical signal and outputs the generated optical signal, a base station transmission unit demultiplexes the output optical signal for each of wavelengths, outputs the demultiplexed optical signals, converts the demultiplexed optical signals into electrical signals to demodulate the RF signal, outputs the demodulated RF signal, and each of first ports of a matrix operation unit including the plurality of first ports and a plurality of second ports and configured to use each of the first ports as a reference port and perform, on signals obtained by the reference ports, a BFN matrix operation of performing phase changes that are different for each of positions of the reference ports and cause each of phases of signals output from the plurality of second ports to have a linear inclination receives the demodulated RF signal and forms transmission beams in different directions for each of wavelengths by a plurality of trType: GrantFiled: November 25, 2019Date of Patent: March 19, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota Ito, Mizuki Suga, Yushi Shirato, Naoki Kita
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Publication number: 20240063907Abstract: A radio communication method performed by a radio communication device includes an inverse fast Fourier transform step of performing inverse fast Fourier transform on a digital electric signal associated with a downlink radio signal, a digital-to-analogue conversion step of converting the digital electric signal subjected to the inverse fast Fourier transform into a first analogue electric signal, an electro-optic conversion step of converting the first analogue electric signal into an optical signal, a step of transmitting the optical signal, a photoelectric conversion step of converting the transmitted optical signal into a second analogue electric signal, and a step of transmitting the downlink radio signal corresponding to the second analogue electric signal.Type: ApplicationFiled: January 22, 2021Publication date: February 22, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Takuto ARAI, Yushi SHIRATO, Daisei UCHIDA, Naoki KITA, Takeshi ONIZAWA
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Patent number: 11804901Abstract: A derivation method includes: a transmission step of transmitting, to a wireless terminal, a first radio-wave signal according to an optical signal with a first wavelength and a second radio-wave signal according to an optical signal with a second wavelength; a communication start time information acquisition step of acquiring information on a first communication start time and information on a second communication start time; a reception time information acquisition step of acquiring information on a first reception time and information on a second reception time; a transmission time period derivation step of deriving a first round trip time and deriving a second round trip time; and an optical fiber length derivation step of deriving an optical fiber length, based on the first round trip time, the second round trip time, a group velocity or a group delay time of the optical signal with the first wavelength, and a group velocity or a group delay time of the optical signal with the second wavelength.Type: GrantFiled: January 31, 2020Date of Patent: October 31, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Mizuki Suga, Kota Ito, Yushi Shirato, Naoki Kita
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Patent number: 11736191Abstract: n wavelengths set such that delay differences between optical signals due to wavelength dispersion in an optical fiber between accommodation and base stations are at equal intervals are assigned to n antenna elements of the base station which are at predetermined intervals. The accommodation station adjusts the phases of optical signals of the wavelengths or modulated signals that modulate the optical signals such that the amounts of phase shift of their RF signals are at predetermined intervals. The accommodation station transmits beacon signals multiple times while varying a transmission phase shift interval ?1 and the terminal transmits beacon number information of a beacon signal selected based on received power multiple times.Type: GrantFiled: June 26, 2019Date of Patent: August 22, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota Ito, Mizuki Suga, Yushi Shirato, Naoki Kita
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Patent number: 11736190Abstract: A derivation method is a derivation method performed by a communication system, including: a transmission step of transmitting a first radio-wave signal according to an optical signal with a first wavelength and a second radio-wave signal according to an optical signal with a second wavelength; a communication start time information acquisition step of acquiring information on a first communication start time and information on a second communication start time; a reception time information acquisition step of acquiring information on a first reception time that is a reception time related to the first radio-wave signal, and information on a second reception time that is a reception time related to the second radio-wave signal; and an optical fiber length derivation step of deriving a length of the optical fiber, based on the first communication start time, the first reception time, the second communication start time, the second reception time, a group velocity or a group delay time of the optical signal witType: GrantFiled: January 31, 2020Date of Patent: August 22, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Mizuki Suga, Kota Ito, Yushi Shirato, Naoki Kita
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Publication number: 20230261746Abstract: A communication system includes a central station device and a base station device. The central station device includes: a plurality of signal processing units, each generating an electrical signal of a wireless signal by performing signal processing corresponding to a wireless system; a conversion unit that generates an optical signal by performing intensity modulation on the electrical signal; and a signal processing control unit that controls the conversion unit to generate an optical signal in which a plurality of the electrical signals are multiplexed. The base station device includes: an electrical signal generation unit that receives the optical signal generated in the central station device via an optical transmission path and converts the received optical signal into a plurality of electrical signals; and a plurality of antenna devices, each wirelessly transmitting the wireless signal according to the electrical signal generated by the electrical signal generation unit.Type: ApplicationFiled: June 25, 2020Publication date: August 17, 2023Inventors: Kota ITO, Mizuki SUGA, Yushi SHIRATO, Naoki KITA
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Publication number: 20220393764Abstract: An accommodation station transmission unit modulates light to generate an optical signal based on an RF signal and outputs the generated optical signal, a base station transmission unit obtains the optical signal from an input port, demultiplexes the obtained optical signal for each wavelength, outputs the demultiplexed optical signals from output ports of corresponding wavelengths from among a plurality of output ports allocated to each of the wavelengths of the light, and demodulates the RF signal by converting the optical signals output by the output ports into electrical signals, a plurality of transmission antennas emit the demodulated RF signal, and a reflect array or a transmit array receives the RF signal emitted by each of the transmission antennas and forms a transmission beam in a different direction for each position of the transmission antenna that is a transmission source of the RF signal for each RF signal.Type: ApplicationFiled: November 25, 2019Publication date: December 8, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Yushi SHIRATO, Naoki KITA
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Publication number: 20220385368Abstract: An accommodation station transmission unit modulates light based on an RF signal to generate an optical signal and outputs the generated optical signal, a base station transmission unit demultiplexes the output optical signal for each of wavelengths, outputs the demultiplexed optical signals, converts the demultiplexed optical signals into electrical signals to demodulate the RF signal, outputs the demodulated RF signal, and each of first ports of a matrix operation unit including the plurality of first ports and a plurality of second ports and configured to use each of the first ports as a reference port and perform, on signals obtained by the reference ports, a BFN matrix operation of performing phase changes that are different for each of positions of the reference ports and cause each of phases of signals output from the plurality of second ports to have a linear inclination receives the demodulated RF signal and forms transmission beams in different directions for each of wavelengths by a plurality of trType: ApplicationFiled: November 25, 2019Publication date: December 1, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Yushi SHIRATO, Naoki KITA
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Publication number: 20220368422Abstract: n wavelengths set such that delay differences between optical signals due to wavelength dispersion in an optical fiber between accommodation and base stations are at equal intervals are assigned to n antenna elements of the base station which are at predetermined intervals. The accommodation station adjusts the phases of optical signals of the wavelengths or modulated signals that modulate the optical signals such that the amounts of phase shift of their RF signals are at predetermined intervals. The accommodation station transmits beacon signals multiple times while varying a transmission phase shift interval ?1 and the terminal transmits beacon number information of a beacon signal selected based on received power multiple times.Type: ApplicationFiled: June 26, 2019Publication date: November 17, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Yushi SHIRATO, Naoki KITA
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Publication number: 20220290990Abstract: A measurement method includes: a data acquisition step of acquiring position data output from a measurement device configured to move round-trip on a movement route and measure a position of an object in a periphery of the movement route, the measurement device using a plane having a depression angle or an elevation angle with respect to a plane that is orthogonal to a forward direction as a measurement target; and a point group data generation step of generating point group data for an object in the periphery of the movement path using the position data obtained during movement of the measurement device on an outbound trip and position data obtained during movement of the measurement device on a return trip.Type: ApplicationFiled: July 10, 2019Publication date: September 15, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Hideyuki TSUBOI, Hideki TOSHINAGA, Kazuto GOTO, Satoshi KUROSAKI, Mizuki SUGA, Kota ITO, Naoki KITA