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公开(公告)号：US20220270460A1
公开(公告)日：2022-08-25
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：US20220264308A1
公开(公告)日：2022-08-18
申请号：US17625420
申请日：2020-07-10
Applicant: NEC Corporation
Inventor： Jun SAKAI , Masaki KITSUNEZUKA , Taichi OHTSUJI , Toshiki TAKEUCHI , Shoji NISHIMURA , Yasufumi HIRAKAWA
IPC: H04W12/122 , H04W12/63 , H04W24/10 , H04W12/69
Abstract: A wireless terminal detection system provided with a radio wave identification unit that extracts identification information in accordance with the wireless terminals that are transmission sources; a radio wave intensity measurement unit that measures radio wave intensities of the radio waves; a distance estimation unit that estimates an attenuation rate of the radio wave intensities with respect to distance based on a number of the wireless terminals, and that estimates distances to the individual wireless terminals based on the estimated attenuation rate; and a notification unit that notifies a user that a suspicious wireless terminal has been detected if, based on the identification information, a wireless terminal among the radio wave transmission sources is determined to be registered as a suspicious wireless terminal, and the estimated distance to the wireless terminal among the radio wave transmission sources is not more than a prescribed distance.
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公开(公告)号：US20220070046A1
公开(公告)日：2022-03-03
申请号：US17410064
申请日：2021-08-24
Applicant: NEC Corporation
Inventor： Kiyohiko TAKAHASHI , Kaoru KISHIMOTO , Toshiki TAKEUCHI , Taichi OHTSUJI
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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公开(公告)号：US20180184436A1
公开(公告)日：2018-06-28
申请号：US15579735
申请日：2016-01-28
Applicant: NEC CORPORATION
Inventor： Taichi OHTSUJI , Kazushi MURAOKA , Hiroaki AMINAKA
CPC classification number: H04W72/085 , H04B7/14 , H04B7/15507 , H04B7/2606 , H04W8/005 , H04W76/10 , H04W88/04 , H04W92/18
Abstract: A relay selecting apparatus (1, 3 or 5) is configured to select at least one specific relay terminal (2) suitable for a remote terminal (1) from among one or more relay terminals (2) based on a selection criterion that considers a time variation of a device-to-device (D2D) link quality between the remote terminal (1) and each of the one or more relay terminals (2). In this way, it is possible to contribute to improving a relay selection so as to provide a stable relay quality.
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