Patents by Inventor Kazushi Muraoka

Kazushi Muraoka 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: 11309991
    Abstract: A BP detector of a wireless receiver apparatus reads a first parameter set or a second parameter set. The first parameter set includes a plurality of scaling factors and a plurality of damping factors learned together using a deep learning technique. The second parameter set includes a plurality of scaling factors and a plurality of node selection factors learned together using a deep learning technique from a memory. The BP detector executes an iterative BP algorithm that uses the first parameter set or the second parameter set in order to perform multi-user detection.
    Type: Grant
    Filed: April 14, 2021
    Date of Patent: April 19, 2022
    Assignees: NEC CORPORATION, OSAKA UNIVERSITY, THE DOSHISHA
    Inventors: Kazushi Muraoka, Naoto Ishii, Takumi Takahashi, Seiichi Sampei, Shinsuke Ibi
  • Publication number: 20210344524
    Abstract: A wireless apparatus includes a channel estimation part that acquires an estimated impulse response which is an estimate value of an impulse response of a channel between a wireless terminal and the wireless apparatus, a tap location error detection part that detects a tap location error between estimated impulse responses at different time points out of the estimated impulse responses, and a channel prediction part that calculates a predicted impulse response which is an impulse response of the channel at a future time point by using the estimated impulse responses and the tap location error.
    Type: Application
    Filed: March 8, 2019
    Publication date: November 4, 2021
    Applicant: NEC CORPORATION
    Inventors: Jun SHIKIDA, Kazushi MURAOKA, Naota ISHII
  • Publication number: 20210320750
    Abstract: A BP detector of a wireless receiver apparatus reads a first parameter set or a second parameter set. The first parameter set includes a plurality of scaling factors and a plurality of damping factors learned together using a deep learning technique. The second parameter set includes a plurality of scaling factors and a plurality of node selection factors learned together using a deep learning technique from a memory. The BP detector executes an iterative BP algorithm that uses the first parameter set or the second parameter set in order to perform multi-user detection.
    Type: Application
    Filed: April 14, 2021
    Publication date: October 14, 2021
    Applicants: NEC CORPORATION, OSAKA UNIVERSITY, THE DOSHISHA
    Inventors: Kazushi MURAOKA, Naoto ISHII, Takumi TAKAHASHI, Seiichi SAMPEI, Shinsuke IBI
  • Publication number: 20210321284
    Abstract: A computer system includes at least one memory and at least one processor coupled to the at least one memory and configured to execute one or more sets of instructions. The one or more sets of instructions, when executed by the at least one processor, cause the computer system to provide virtualized radio access network functions including executing a BP algorithm and provide controller functions including adjusting the total number of iterations of the BP algorithm depending on available computing resources of the computer system.
    Type: Application
    Filed: April 14, 2021
    Publication date: October 14, 2021
    Applicants: NEC CORPORATION, OSAKA UNIVERSITY, THE DOSHISHA
    Inventors: Kazushi Muraoka, Naoto Ishii, Takumi Takahashi, Shinsuke Ibi
  • Publication number: 20210235295
    Abstract: A radio terminal (2) is used in a radio communication system (100) and communicates with a radio station (1). The radio terminal (2) includes a measurement unit (20). The measurement unit (20) operates to perform, using a terminal measurement procedure for executing a first terminal measurement corresponding to radio access technology applied to the radio communication system (100), a second terminal measurement of a shared frequency shared by a plurality of radio systems including the radio communication system (100).
    Type: Application
    Filed: April 13, 2021
    Publication date: July 29, 2021
    Applicant: NEC Corporation
    Inventors: Hisashi FUTAKI, Hiroaki AMINAKA, Hiroto SUGAHARA, Yoshikazu KAKURA, Kazushi MURAOKA
  • Patent number: 11076131
    Abstract: A video collection system includes: a plurality of terminals; and a video collection server that requests at least one of the plurality of terminals to perform information provision. The video collection server includes a calculation part, a determination part, and a request part. The calculation part calculates, based on information acquired from a camera(s), a first area(s) imaged by the camera(s). The determination part determines a second area(s) as an information provision target(s) based on a location(s) of the first area(s). The request part selects, based on respective locations of the plurality of terminals and a location(s) of the second area(s), a terminal(s) to be requested to perform the information provision from the plurality of terminals and requests the selected terminal(s) to provide video data of the second area(s).
    Type: Grant
    Filed: February 22, 2017
    Date of Patent: July 27, 2021
    Assignee: NEC CORPORATION
    Inventors: Norio Yamagaki, Dai Kanetomo, Hiroaki Aminaka, Kazushi Muraoka, Taichi Ohtsuji, Takashi Yoshinaga
  • Patent number: 11071119
    Abstract: An apparatus (1 or 3) adjusts a bandwidth, throughput, or radio resource used for device-to-device (D2D) transmission from a remote terminal (1) to a relay terminal (2), based on an amount of pending uplink data in the relay terminal (2) to be transmitted from the relay terminal (2) to a base station (3). In this way, for example, it is possible to contribute to avoiding inconsistency of performance between sidelink transmission from the remote terminal to the relay terminal and uplink transmission from the relay terminal to the base station.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: July 20, 2021
    Assignee: NEC CORPORATION
    Inventors: Masaki Inokuchi, Kazushi Muraoka
  • Patent number: 11049374
    Abstract: A tracking support system includes a position calculating section connected with a plurality of cameras arranged in a predetermined monitoring area to transmit video images imaged by the plurality of cameras and configured to calculate a position of the tracking target based on the video images received from the plurality of cameras; a tracker selecting section configured to select a tracker to be instructed to track the tracking target, based on position information of the terminal received from the terminal and the calculated position of the tracking target; and an information transmitting section configured to transmit information of a distance between the tracking target and the terminal during the tracking of the tracking target to the terminal carried by the selected tracker.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: June 29, 2021
    Assignee: NEC CORPORATION
    Inventors: Taichi Ohtsuji, Kazushi Muraoka, Hiroaki Aminaka, Dai Kanetomo, Norio Yamagaki, Takashi Yoshinaga
  • Publication number: 20210166536
    Abstract: A tracking support system includes a position calculating section connected with a plurality of cameras arranged in a predetermined monitoring area to transmit video images imaged by the plurality of cameras and configured to calculate a position of the tracking target based on the video images received from the plurality of cameras; a tracker selecting section configured to select a tracker to be instructed to track the tracking target, based on position information of the terminal received from the terminal and the calculated position of the tracking target; and an information transmitting section configured to transmit information of a distance between the tracking target and the terminal during the tracking of the tracking target to the terminal carried by the selected tracker.
    Type: Application
    Filed: January 14, 2021
    Publication date: June 3, 2021
    Applicant: NEC CORPORATION
    Inventors: Taichi OHTSUJI, Kazushi Muraoka, Hiroaki Aminaka, Dai Kanetomo, Norio Yamagaki, Takashi Yoshinaga
  • Patent number: 11012168
    Abstract: A wireless terminal (1) includes at least one memory (706), at least one processor coupled to the at least one memory (706); and an RF transceiver (701) capable of performing device-to-device (D2D) communication. The wireless terminal (1) receives a discovery signal transmitted from another wireless terminal (1) by using the RF transceiver (701), estimates a transmission power value of a transmission terminal of the discovery signal in accordance with a type of the discovery signal, and determines an inter-terminal path loss between the wireless terminals by using the estimated transmission power value and the received power value of the discovery signal. In this way, the inter-terminal path loss is estimated without the need for receiving notification regarding a transmission power value from a base station (2) to the terminal (1) when ProSe direct discovery is used.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: May 18, 2021
    Assignee: NEC CORPORATION
    Inventor: Kazushi Muraoka
  • Patent number: 11012821
    Abstract: Radio terminals (1A, 1B, 1C) each receive a broadcast/multicast signal (220) from a cellular communication network (10). The representative terminal (1A) receives response messages from the respective neighboring radio terminals (1B, 1C) via D2D communication (231, 232). Each response message is generated based on reception of the broadcast/multicast signal (220) by each neighboring radio terminal (1B, 1C). The representative terminal (1A) generates a representative response message and transmits it to the cellular communication network (10) or another node (7) via uplink transmission (240). It is thus, for example, possible to contribute to improving efficiency of transmission by radio terminals of response messages related to a broadcast/multicast service.
    Type: Grant
    Filed: January 18, 2018
    Date of Patent: May 18, 2021
    Assignee: NEC CORPORATION
    Inventors: Taichi Ohtsuji, Kazushi Muraoka
  • Patent number: 11012876
    Abstract: A radio terminal (2) is used in a radio communication system (100) and communicates with a radio station (1). The radio terminal (2) includes a measurement unit (20). The measurement unit (20) operates to perform, using a terminal measurement procedure for executing a first terminal measurement corresponding to radio access technology applied to the radio communication system (100), a second terminal measurement of a shared frequency shared by a plurality of radio systems including the radio communication system (100).
    Type: Grant
    Filed: July 17, 2020
    Date of Patent: May 18, 2021
    Assignee: NEC CORPORATION
    Inventors: Hisashi Futaki, Hiroaki Aminaka, Hiroto Sugahara, Yoshikazu Kakura, Kazushi Muraoka
  • Patent number: 10993238
    Abstract: A processing apparatus (3A) acquires the number of one or more neighbor cells (31B) to which one or more neighbor-cell D2D radio terminals (2G), located in proximity to a first D2D communication pair (2E) belonging to a first cell (31A), belong. In addition, depending on the acquired number of the one or more neighbor cells (31B), the processing apparatus (3A) determines, from D2D radio resources that are shared among three or more cells (31A, 31B, 31E), a first part allocatable to the first D2D communication pair (2E). It is thus, for example, possible to contribute to efficient use of D2D radio resources shared among at least three cells adjacent to one another.
    Type: Grant
    Filed: January 18, 2018
    Date of Patent: April 27, 2021
    Assignee: NEC CORPORATION
    Inventor: Kazushi Muraoka
  • Patent number: 10992499
    Abstract: A radio apparatus (10) includes an estimation unit (2) configured to calculate an estimated value of a channel response for each of a plurality of antennas, a padding unit (3) configured to generate a first antenna-space channel vector having dimensions larger than the number of the antennas by combining the estimated value with a padding value, a spatial transformation unit (4) configured to calculate a first beam-space channel vector by spatial transforming the first antenna-space channel vector, a noise suppression unit (5) configured to generate a second beam-space channel vector by suppressing at least one element of the first beam-space channel vector, an inverse spatial transformation unit (6) configured to calculate a second antenna-space channel vector by inversely and spatial transforming the second beam-space channel vector, and an extraction unit (7) configured to determine an estimated value of each channel based on the second antenna-space channel vector.
    Type: Grant
    Filed: January 30, 2019
    Date of Patent: April 27, 2021
    Assignee: NEC CORPORATION
    Inventors: Jun Shikida, Kazushi Muraoka, Naoto Ishii
  • Publication number: 20210105584
    Abstract: Radio terminals (1A, 1B, 1C) each receive a broadcast/multicast signal (220) from a cellular communication network (10). The representative terminal (1A) receives response messages from the respective neighboring radio terminals (1B, 1C) via D2D communication (231, 232). Each response message is generated based on reception of the broadcast/multicast signal (220) by each neighboring radio terminal (1B, 1C). The representative terminal (1A) generates a representative response message and transmits it to the cellular communication network (10) or another node (7) via uplink transmission (240). It is thus, for example, possible to contribute to improving efficiency of transmission by radio terminals of response messages related to a broadcast/multicast service.
    Type: Application
    Filed: January 18, 2018
    Publication date: April 8, 2021
    Applicant: NEC Corporation
    Inventors: Taichi OHTSUJI, Kazushi MURAOKA
  • Patent number: 10911987
    Abstract: A radio base station (1) determines allocated radio resources and a Modulation and Coding Scheme (MCS) for each of a plurality of bandwidth-guaranteed radio terminals in a manner such that an amount of radio resources to be allocated to each bandwidth-guaranteed radio terminal is increased and the MCS to be set for each bandwidth-guaranteed radio terminal is reduced as far as possible within a range that allows a transmission rate of each bandwidth-guaranteed radio terminal obtained after the radio resources are allocated to the plurality of bandwidth-guaranteed radio terminals to achieve a desired transmission rate. Accordingly, for example, it is possible to provide adaptive modulation and coding that allows a bandwidth-guaranteed user to achieve a desired transmission rate (or that makes it possible to increase a probability of achieving a desired transmission rate).
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: February 2, 2021
    Assignee: NEC CORPORATION
    Inventor: Kazushi Muraoka
  • Publication number: 20210021446
    Abstract: A radio apparatus (10) includes an estimation unit (2) configured to calculate an estimated value of a channel response for each of a plurality of antennas, a padding unit (3) configured to generate a first antenna-space channel vector having dimensions larger than the number of the antennas by combining the estimated value with a padding value, a spatial transformation unit (4) configured to calculate a first beam-space channel vector by spatial transforming the first antenna-space channel vector, a noise suppression unit (5) configured to generate a second beam-space channel vector by suppressing at least one element of the first beam-space channel vector, an inverse spatial transformation unit (6) configured to calculate a second antenna-space channel vector by inversely and spatial transforming the second beam-space channel vector, and an extraction unit (7) configured to determine an estimated value of each channel based on the second antenna-space channel vector.
    Type: Application
    Filed: January 30, 2019
    Publication date: January 21, 2021
    Applicant: NEC CORPORATION
    Inventors: Jun SHIKIDA, Kazushi MURAOKA, Naoto ISHII
  • Patent number: 10897784
    Abstract: A base station (2) is configured to receive, from a first wireless terminal (1), a first group identifier indicating a first terminal group, and allocate, to the first wireless terminal (1), a second radio resource, rather than a first radio resource, for device-to-device (D2D) communication performed by the first wireless terminal (1). The first radio resource is a radio resource which has already been allocated to any other wireless terminal which has sent the first group identifier. Meanwhile, the second radio resource is a radio resource which has already been allocated to any other wireless terminal which has sent a second group identifier indicating a second terminal group different from the first terminal group. It is thus, for example, possible to preventing a plurality of D2D communication signals, which are transmitted from multiple wireless terminals to a single wireless terminal, from being transmitted on the same radio resource.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: January 19, 2021
    Assignee: NEC CORPORATION
    Inventors: Kazushi Muraoka, Hiroaki Aminaka
  • Patent number: 10897299
    Abstract: A wireless apparatus multiplies, by a first weight corresponding to each of a plurality of beams, a received signal corresponding to a reference signal transmitted from each of wireless terminals, estimates a channel response associated with each of the beams, computes a predetermined metric for each combination of beams to be used, selects the beams to be used when performing signal detection with respect to a received signal into which radio signals transmitted from the wireless terminals are spatially multiplexed based on the predetermined metric, determines a second weight to be used for the signal detection and multiplies, by the second weight, the received signal into which radio signals transmitted from the wireless terminals are spatially multiplexed to perform the signal detection.
    Type: Grant
    Filed: November 8, 2018
    Date of Patent: January 19, 2021
    Assignee: NEC Corporation
    Inventor: Kazushi Muraoka
  • Publication number: 20200351684
    Abstract: A radio terminal (2) is used in a radio communication system (100) and communicates with a radio station (1). The radio terminal (2) includes a measurement unit (20). The measurement unit (20) operates to perform, using a terminal measurement procedure for executing a first terminal measurement corresponding to radio access technology applied to the radio communication system (100), a second terminal measurement of a shared frequency shared by a plurality of radio systems including the radio communication system (100).
    Type: Application
    Filed: July 17, 2020
    Publication date: November 5, 2020
    Applicant: NEC Corporation
    Inventors: Hisashi FUTAKI, Hiroaki AMINAKA, Hiroto SUGAHARA, Yoshikazu KAKURA, Kazushi MURAOKA