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公开(公告)号：US11757548B2
公开(公告)日：2023-09-12
申请号：US17316844
申请日：2021-05-11
申请人： NEC Corporation
发明人： Taichi Ohtsuji , Jun Sakai
IPC分类号： H04B17/391 , H04W16/18
CPC分类号： H04B17/391 , H04W16/18
摘要： A transmission apparatus recognition apparatus includes a receiver configured to receives a signal wirelessly transmitted from a transmission apparatus, a signal region detector, a feature extractor, and a recognizer. The signal region detector generates a spectrogram from a received signal received by the receiver, and detects a signal region parameter indicating a specific signal region based on the spectrogram. The feature extractor converts the received signal based on a signal conversion parameter according to the signal region parameter, and extracts a feature from the converted signal. The recognizer calculates a degree of similarity based on the extracted feature and a feature stored in advance, and recognizes the transmission apparatus based on the degree of similarity. The transmission apparatus recognition apparatus adjusts the signal region parameter based on a recognition accuracy of the recognizer.
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2.发明授权公开(公告)号：US11727775B2
公开(公告)日：2023-08-15
申请号：US17148747
申请日：2021-01-14
申请人： NEC CORPORATION
发明人： Taichi Ohtsuji , Kazushi Muraoka , Hiroaki Aminaka , Dai Kanetomo , Norio Yamagaki , Takashi Yoshinaga
IPC分类号： G06V20/52 , G08B13/196 , G06T7/292 , G08B25/00
CPC分类号： G08B13/19608 , G06T7/292 , G06V20/52 , G08B13/19613 , G08B13/19645 , G08B25/009 , G06T2207/30232
摘要： 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.
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公开(公告)号：US10511976B2
公开(公告)日：2019-12-17
申请号：US15740676
申请日：2016-03-11
申请人： NEC Corporation
发明人： Kazushi Muraoka , Taichi Ohtsuji
摘要： A radio terminal (1) selects, from a resource pool in a discovery period, NTX sets of resource blocks for NTX transmissions of a discovery signal based on a first value n1 that is a resource value autonomously selected by the radio terminal (1) or is a parameter received from a base station (2). A frequency domain shift from a second resource block set used in (j−1)th transmission (j is an integer no less than 2) to a first resource block set used in j-th transmission of the discovery signal in the discovery period depends on at least one of the first value n1 and a frequency domain position of the second resource block set in the resource pool. It is thus, for example, possible to attenuate decline in reception quality of a discovery signal due to interference resulting from In-Band Emissions (IBE) when direct discovery of D2D communication is performed.
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公开(公告)号：US12058527B2
公开(公告)日：2024-08-06
申请号：US17542665
申请日：2021-12-06
申请人： NEC Corporation
发明人： Taichi Ohtsuji , Toshiki Takeuchi , Hiroyuki Akiba
摘要： A transmission apparatus recognition apparatus includes a storage unit that stores K sets of template feature groups for estimating K (an integer of 2 or more) kinds of information indicative of a transmission apparatus, a degree-of-similarity calculation unit that generates an i (an integer of 1 to K)-th sample feature from a radio feature, and calculates an i-th degree-of-similarity group, based on the i-th sample feature and an i-th set of the template feature group, a summed degree-of-similarity calculation unit that calculates a summed degree of similarity by summing K degrees of similarity by using an i-th weighting factor with respect to 1 to K of i, and an estimation unit that estimates that K information pieces, which are correlated in advance with calculation sources of K degrees of similarity having the summed degree of similarity that is highest, are information indicative of the transmission apparatus.
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公开(公告)号：US12052062B2
公开(公告)日：2024-07-30
申请号：US17637116
申请日：2019-10-08
申请人： NEC Corporation
发明人： Taichi Ohtsuji
摘要： The present invention improves efficiency of operator's work by automating template registration of an unregistered transmission apparatus. A transmission apparatus recognition apparatus includes a receiving unit, a recognition unit, and a template feature registration unit. The receiving unit receives a signal wirelessly transmitted from a transmission apparatus. The recognition unit calculates a degree of similarity between a sample feature generated from a received signal received by the receiving unit and template features registered in advance, compares the degree of similarity with recognition threshold value, and thereby recognizes the transmission apparatus. The template feature registration unit generates a template feature from a sample feature that failed to be recognized by the recognition unit.
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6.发明授权公开(公告)号：US11049374B2
公开(公告)日：2021-06-29
申请号：US16472688
申请日：2017-03-02
申请人： NEC CORPORATION
发明人： Taichi Ohtsuji , Kazushi Muraoka , Hiroaki Aminaka , Dai Kanetomo , Norio Yamagaki , Takashi Yoshinaga
IPC分类号： G08B13/196 , G06T7/292 , G06K9/00 , G08B25/00
摘要： 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.
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公开(公告)号：US11122493B2
公开(公告)日：2021-09-14
申请号：US16465420
申请日：2017-06-27
申请人： NEC CORPORATION
发明人： Taichi Ohtsuji
摘要： A relay terminal (2) transmits selection assistance information to a remote terminal (1). The selection assistance information includes a first information element transmitted from a base station (3) and received by the relay terminal (2). The first information element indicates at least one of: (a) a frequency band of the base station (3); a system bandwidth; downlink transmission power; UL/DL configuration; the number of cells provided to the relay terminal; a type of a cell; a RAT or a communication scheme used between the base station (3) and the relay terminal (2); and a name or identifier of a mobile operator providing the base station. This is thus, for example, possible to contribute to improving appropriateness of a relay selection.
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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
申请人： NEC Corporation
摘要： 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：US10778324B2
公开(公告)日：2020-09-15
申请号：US15736165
申请日：2016-02-10
申请人： NEC Corporation
发明人： Hiroaki Aminaka , Kazushi Muraoka , Taichi Ohtsuji
摘要： A D2D communication control apparatus (10) according to the present invention includes: a communication unit (11) configured to receive determination information that can be used to determine whether each of a plurality of radio terminals is capable of performing device-to-device (D2D) communication with another radio terminal; and a selection unit (12) configured to select, using the determination information between radio terminals that may operate as relay radio terminals, a candidate for a relay radio terminal that relays the communication between one of the plurality of radio terminals and a network, the relay radio terminal candidate transmitting a response signal in response to a first discovery signal transmitted from one of the radio terminals by performing D2D communication with the one of the plurality of radio terminals and performing cellular communication with the network.
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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
申请人： NEC Corporation
CPC分类号： H04L27/364 , G06N20/00 , H04L27/0012 , H04L27/0014 , H04L27/3854 , H04L2027/0065
摘要： 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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