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公开(公告)号：US11700163B2
公开(公告)日：2023-07-11
申请号：US17410064
申请日：2021-08-24
Applicant: NEC Corporation
Inventor： Kiyohiko Takahashi , Kaoru Kishimoto , Toshiki Takeuchi , Taichi Ohtsuji
CPC classification number: H04L27/364 , G06N20/00 , H04L27/0012 , H04L27/0014 , H04L27/3854 , H04L2027/0065
Abstract: A modulation format estimation device 100 includes: a frequency shift correction unit 112 configured to estimate the amount of a frequency shift using a baseband signal acquired from a received signal and correct the baseband signal based on an estimation result; a frequency error generation unit 122 configured to generate a plurality of frequency errors from a range set based on an error occurring in the estimation of the frequency shift amount; a frequency error introduction unit 123 configured to acquire learning baseband signals in which each of a plurality of source signals modulated by different modulation formats is frequency-shifted by each frequency error; and a modulation format estimation unit 113 configured to input a corrected baseband signal to a first machine learning model created by machine learning using learning data including the plurality of learning baseband signals and a label, and estimate a modulation format of the received signal.
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2.发明公开公开(公告)号：US20230171131A1
公开(公告)日：2023-06-01
申请号：US17988951
申请日：2022-11-17
Applicant: NEC Corporation
Inventor： Kiyohiko Takahashi , Toshiki Takeuchi , Naoto Ishii
CPC classification number: H04L25/03019 , H04L27/265
Abstract: A signal detection unit detects, from a baseband signal of a received radio wave, two types of fixed signal sections that have different communication information and are present in sufficiently shorter time than a time period in which influence of fading fluctuates, and designate the detected two types of fixed signal sections as an information-1 section and an information-2 section. An information-1 section signal processing unit clips the information-1 section from the baseband signal, and performs Fourier transform on the clipped information-1 section. An information-2 section signal processing unit clips the information-2 section from the baseband signal, and performs Fourier transform on the clipped information-2 section. A feature value computation unit computes a feature value, based on an output of the information-1 section signal processing unit and an output of the information-2 section signal processing unit.
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公开(公告)号：US11523366B2
公开(公告)日：2022-12-06
申请号：US16973614
申请日：2019-06-12
Applicant: NEC Corporation
Inventor： Taichi Ohtsuji , Toshiki Takeuchi , Masaki Kitsunezuka
Abstract: A terminal number estimating system includes: a plurality of receivers that receive a wireless signal transmitted from a plurality of terminal devices by frequency-division multiple access; a Fourier transform unit that performs a discrete Fourier transform on each wireless signal received by the plurality of reception means and outputs a discrete Fourier coefficient; and a terminal number estimation unit that estimates a position of each terminal device by clustering a resource block of each wireless signal based on each discrete Fourier coefficient.
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4.发明授权公开(公告)号：US11308346B2
公开(公告)日：2022-04-19
申请号：US16964886
申请日：2019-02-01
Applicant: NEC Corporation
Inventor： Toshiki Takeuchi
IPC: G06K9/62
Abstract: A system includes a first analysis apparatus, a second analysis apparatus, and a sensor fusion apparatus. The individual analysis apparatuses analyze outputs of their respective sensors and generate preciseness information about preciseness of the positions of their respective objects. The sensor fusion apparatus calculates the distance between a determination target object and an association candidate object per directional axis that is determined from a position of a sensor corresponding to the determination target object. The sensor fusion apparatus normalizes the distance calculated per directional axis by using the preciseness information corresponding to the determination target object. The sensor fusion apparatus calculates the distance between the determination target object and the association candidate object by using the distance normalized per directional axis as a post-normalization distance. The sensor fusion apparatus determines whether the association candidate object matches the determination target object by using the post-normalization distance.
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公开(公告)号：US10459062B2
公开(公告)日：2019-10-29
申请号：US15765859
申请日：2016-10-04
Applicant: NEC CORPORATION
Inventor： Toshiki Takeuchi
Abstract: An antenna directivity control parameter generating apparatus includes a memory that stores image processing data generated by image processing and a processor that calculates an antenna directivity control parameter for a base station based on the image processing data.
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Patent Agency Ranking
公开(公告)号：US12217587B2
公开(公告)日：2025-02-04
申请号：US17625412
申请日：2020-07-10
Applicant: NEC Corporation
Inventor： Jun Sakai , Masaki Kitsunezuka , Toshiki Takeuchi , Taichi Ohtsuji , Shoji Nishimura , Yasufumi Hirakawa
Abstract: A wireless terminal detection system provided with user position information acquisition means for measuring a position of a reception-side wireless terminal; pattern classification means for classifying movement patterns extracted from position history information of the reception-side wireless terminal into ordinary patterns and non-ordinary patterns based on classification results in which the movement patterns are classified in accordance with times and positions; and determination means for determining whether a transmission-side wireless terminal, which is a transmission source of radio waves received by the reception-side wireless terminal, is a suspicious terminal based on a reception history of radio waves from the transmission-side wireless terminal in time intervals classified as the non-ordinary patterns.
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公开(公告)号：US20220386153A1
公开(公告)日：2022-12-01
申请号：US17748240
申请日：2022-05-19
Applicant: NEC Corporation
Inventor： Toshiki Takeuchi
IPC: H04W24/08 , H04B17/345
Abstract: A radio wave anomaly detection system outputs a detection result about a radio wave anomaly that is included in received data and has been detected using a first feature that is a feature extracted from the received data every first predetermined time period, and a second feature that is a feature extracted from the received data every second predetermined time period longer than the first predetermined time period.
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8.发明授权公开(公告)号：US11546873B2
公开(公告)日：2023-01-03
申请号：US16972786
申请日：2019-05-10
Applicant: NEC Corporation
Inventor： Toshiki Takeuchi
IPC: H04W64/00
Abstract: An object quantity estimation system 100 includes: a terminal path estimation unit 20 configured to estimate the traveling paths of wireless terminals; an actual quantity-of-people counting unit 30 configured to count the actual quantity of people that are located in each of the fixed points; a terminal detection rate calculation unit 40 configured to calculate the terminal detection rate that indicates a relationship between the quantity of the wireless terminals and the actual quantity of people, for each of the fixed points; and an actual quantity-of-people estimation unit 50 configured to determine priorities of the traveling paths, each of which passes at least one of the fixed points, and sequentially estimate the actual quantity of people having traveled on each traveling path, in descending order of the priorities of the traveling paths, based on the terminal detection rates.
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公开(公告)号：US20200314597A1
公开(公告)日：2020-10-01
申请号：US16828540
申请日：2020-03-24
Applicant: NEC Corporation
Inventor： Kenji ADACHI , Kazuya Tsujimoto , Ryuichiro Matsuoka , Taichi Ohtsuji , Toshiki Takeuchi
Abstract: A moving body tracking system more efficiently identifies a moving body sending a particular radio wave, by including a memory that stores a set of instructions; and at least one processor configured to execute the set of instructions to identify, when a feature value of a radio wave received by a terminal is registered in a database, a moving body sending the radio wave, based on a plurality of images captured by the terminal and associated with the feature value of the radio wave.
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公开(公告)号：US10271339B2
公开(公告)日：2019-04-23
申请号：US15023495
申请日：2014-03-14
Applicant: NEC CORPORATION
Inventor： Toshiki Takeuchi
Abstract: Traffic history storage unit (130) stores, as traffic history, traffic results at base station cell radio units (200-1 to 200-n). Traffic database (140) stores traffic data learned on the basis of the traffic history. Traffic prediction unit (150) predicts, on the basis of the traffic data and the traffic history, traffic fluctuation that may occur after a predetermined time interval. Process resource control unit (160) controls, on the basis of the predicted traffic fluctuation, the allocation of process resources in signal processing cards (121-1 to 121-m) at every predetermined time intervals.
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