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公开(公告)号：US20210328658A1
公开(公告)日：2021-10-21
申请号：US17260610
申请日：2019-06-27
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Kohei Suzaki , Yusuke Asai , Hiroyuki Shiba
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.
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公开(公告)号：US11411325B2
公开(公告)日：2022-08-09
申请号：US16649910
申请日：2018-09-25
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Doohwan Lee , Hirofumi Sasaki , Hiroyuki Fukumoto , Hiroyuki Shiba
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.
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公开(公告)号：US11202211B2
公开(公告)日：2021-12-14
申请号：US16650370
申请日：2018-09-25
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Hirofumi Sasaki , Doohwan Lee , Hiroyuki Fukumoto , Hiroyuki Shiba
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.
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公开(公告)号：US11018749B2
公开(公告)日：2021-05-25
申请号：US17043492
申请日：2019-03-28
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Hirofumi Sasaki , Doohwan Lee , Hiroyuki Fukumoto , Hiroyuki Shiba
Abstract: An OAM multiplexing communication system 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 channel estimation/interference compensation unit that compensates for inter-mode interference between the OAM modes by using a weight. The channel estimation/interference compensation unit selects, for each OAM mode, signals of a subject mode and an adjacent mode from among the signals of the OAM modes separated by the OAM mode separation unit, and compensates for the inter-mode interference by multiplying an approximate weight calculated by using channel matrixes of the subject mode and the adjacent mode.
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公开(公告)号：US11757525B2
公开(公告)日：2023-09-12
申请号：US17260610
申请日：2019-06-27
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Kohei Suzaki , Yusuke Asai , Hiroyuki Shiba
CPC classification number: H04B7/18508 , H04W16/26 , H04W16/28 , H04W88/04
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.
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Patent Agency Ranking
公开(公告)号：US11601823B2
公开(公告)日：2023-03-07
申请号：US17256401
申请日：2019-06-11
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Kohei Suzaki , Yusuke Asai , Hiroyuki Shiba
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.
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7.发明授权公开(公告)号：US11349583B2
公开(公告)日：2022-05-31
申请号：US16973631
申请日：2019-06-05
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Ryo Miyatake , Kohei Suzaki , Yusuke Asai , Hiroyuki Shiba
IPC: H04B17/391 , H04B17/309 , G01S13/89
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.
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公开(公告)号：US11323165B2
公开(公告)日：2022-05-03
申请号：US16650332
申请日：2018-09-25
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Hirofumi Sasaki , Hiroyuki Fukumoto , Doohwan Lee , Hiroyuki Shiba
IPC: H04B7/06 , H04B7/0456 , H04L27/20
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.
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公开(公告)号：US11811143B2
公开(公告)日：2023-11-07
申请号：US17043133
申请日：2019-03-28
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Hirofumi Sasaki , Doohwan Lee , Hiroyuki Fukumoto , Hiroyuki Shiba
IPC: H01Q21/20 , H04B7/0456 , H04L27/36 , H04J99/00
CPC classification number: H01Q21/20 , H04B7/0456 , H04J99/00 , H04L27/366
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.
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公开(公告)号：US11733344B2
公开(公告)日：2023-08-22
申请号：US16973408
申请日：2019-05-21
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Kohei Suzaki , Ryo Miyatake , Yusuke Asai , Hiroyuki Shiba
IPC: G01S5/02 , H04B17/27 , H04B17/345 , G06T7/246 , G01S5/00
CPC classification number: G01S5/0278 , G01S5/02 , G01S5/0215 , G06T7/246 , H04B17/27 , H04B17/345 , G01S5/011 , G06T2207/30192
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 greater than or equal to a predetermined value is less than a predetermined value, that the location of the interference source is within the area.
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