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    SIGNATURE-BASED RFID LOCALIZATION
    61.
    发明申请
    SIGNATURE-BASED RFID LOCALIZATION 审中-公开

    公开(公告)号：US20190311162A1

    公开(公告)日：2019-10-10

    申请号：US16376039

    申请日：2019-04-05

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Mustafa Arslan ,  Sampath Rangarajan

    IPC: G06K7/10

    Abstract: A Radio Frequency Identification (RFID) localization system is provided. The system includes a set of passive RFID tags, each for reflecting transmitted signals. The system further includes an RFID reader for detecting the reflected signals by the passive RFID tags. The system also includes a processor for localizing an object in an area based on the reflected signals by computing signatures using probabilistic macro-channels between the RFID reader and locations of the passive RFID tags. The transmitted signals form inputs to the probabilistic macro-channels, and the signatures form outputs from the probabilistic macro-channels.

    Blue-printing interference for LTE access in unlicensed spectrum
    62.
    发明授权
    Blue-printing interference for LTE access in unlicensed spectrum 有权

    公开(公告)号：US10405209B2

    公开(公告)日：2019-09-03

    申请号：US15915436

    申请日：2018-03-08

    Applicant: NEC Laboratories America, Inc.

    Inventor： Karthikeyan Sundaresan ,  Eugene Chai ,  Mohammad Khojastepour ,  Sampath Rangarajan

    IPC: H04W24/02 ,  H04W72/08 ,  H04W24/10 ,  H04W16/22 ,  H04W16/14

    Abstract: A system, method, and computer program product are provided for blue-printing interference for mobile access in an unlicensed spectrum of a synchronous scheduled cellular access system. The system includes a cellular base station having a processor. The processor constructs and executes an intelligent measurement schedule of clients for uplink transmissions to obtain access measurements for the uplink transmissions. The intelligent measurement schedule is constructed for scalable access measurement overhead. The access measurements indicate interference dependencies between the clients. The processor estimates an interference topology and statistics of the interference topology, from the access measurements to form an interference blueprint. The processor adjusts the intelligent measurement schedule to overschedule the clients for the uplink transmissions to reduce spectrum utilization loss while minimizing client transmission collisions, based on the interference blueprint. The processor initiates the uplink transmissions for the clients in accordance with the adjusted intelligent measurement schedule.

    Battery-free touch-aware user input using RFID tags
    63.
    发明授权
    Battery-free touch-aware user input using RFID tags 有权

    公开(公告)号：US10346655B2

    公开(公告)日：2019-07-09

    申请号：US15833995

    申请日：2017-12-06

    Applicant: NEC Laboratories America, Inc.

    Inventor： Eugene Chai ,  Swadhin Pradhan ,  Sampath Rangarajan ,  Mohammad Khojastepour ,  Karthikeyan Sundaresan

    IPC: G06K7/10 ,  G06K19/07 ,  G06N20/00

    Abstract: Aspects of the present disclosure describe a battery-free touch sensing user interface (UI) for Internet of Things (IoT) and other smart spaces employing Radio Frequency Identification (RFID) readers and tags that we call RIO. With RIO, any surface may be a touch-aware surface by attaching RFID tag(s) thereto. RIO advantageously supports custom-designed RFID tags and therefore facilitates customized UIs to be easily deployed in a real-world environment. RIO employs impedance tracking that results from a human finger—or other appendage—touching a surface of an RFID tag, thereby changing a characteristic impedance of the RFID tag antenna. This change manifests as a change in the phase of the RFID backscattered signal and is advantageously used by RIO to track fine-grained touch movement over the RFID tag. Disclosed further are multi-tag environments in which RIO operates and demonstrations including continuous tracking of finger movement during a swipe to within 3 mm of its actual position.

    Managing analog beams in mmWave networks
    64.
    发明授权
    Managing analog beams in mmWave networks 有权

    公开(公告)号：US10292059B2

    公开(公告)日：2019-05-14

    申请号：US15874016

    申请日：2018-01-18

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Narayan Prasad ,  Sampath Rangarajan ,  Yasaman Ghasempour

    IPC: H04W24/02 ,  H04W72/04 ,  H04W16/28 ,  H04B7/02

    Abstract: A computer-implemented method executed in a wireless communication system for establishing communication links in a millimeter wave network is presented. The method includes determining active communication links between a plurality of transmitters and a plurality of receivers operated by a plurality of users and formulating a quality of service (QoS) proportional fairness (PF) network utility as a constrained submodular set function maximization problem. The method further includes performing an optimization framework by optimizing, based on the active communication links, user association for fixed transmit beam patterns and optimizing, based on the active communication links, the fixed transmit beam patterns and corresponding beam attributes for a fixed set of user associations. The method also includes iteratively performing the optimizing steps in an alternating manner to determine a user from the plurality of users that optimizes the constrained submodular set function maximization problem and assigning the determined user to a cell.

    Distance estimation between an RFID tag and an RFID reader
    65.
    发明授权
    Distance estimation between an RFID tag and an RFID reader 有权

    公开(公告)号：US10234550B2

    公开(公告)日：2019-03-19

    申请号：US15891994

    申请日：2018-02-08

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Mustafa Arslan

    IPC: G01S5/02 ,  G01S7/41 ,  G01S13/26 ,  G01S13/34 ,  G01S13/36 ,  G01S7/292 ,  G01S5/12 ,  G01S5/14 ,  G01S11/02 ,  G01S11/06 ,  G01S7/35 ,  G06K7/10 ,  G06K19/07

    Abstract: A system, method, and computer program product are provided for estimating a distance. The system includes a Radio Frequency Identifier (RFID) reader. The system further includes an RFID tag. The system also includes measurement equipment for measuring a plurality of phase differences at different frequencies between transmitted Radio Frequency (RF) signals from the RFID reader and corresponding received RF signals at the RFID tag. The system additionally includes a processor. The processor is configured to calculate normalized phases from the plurality of phase differences. The processor is further configured to calculate corrected phases by resolving one or more ambiguities from the normalized phases. The processor is also configured to obtain a characteristic curve using the corrected phases. The processor is additionally configured to provide an estimate of the distance based on the characteristic curve and the corrected phases.

    RFID CHECKOUT STATION USING VIRTUAL SHIELDING
    66.
    发明申请
    RFID CHECKOUT STATION USING VIRTUAL SHIELDING 审中-公开

    公开(公告)号：US20180247092A1

    公开(公告)日：2018-08-30

    申请号：US15903857

    申请日：2018-02-23

    Applicant: NEC Laboratories America, Inc.

    Inventor： Mohammad Khojastepour ,  Mustafa Arslan ,  Sampath Rangarajan

    IPC: G06K7/10 ,  G07G1/00 ,  G01S11/06

    CPC classification number: G06K7/10079 ,  G01S11/06 ,  G06K7/10069 ,  G06K7/10118 ,  G07G1/009

    Abstract: A method for detecting RFID tags attached to items positioned at a radio frequency identification (RFID) self-service checkout station is presented. The method includes creating one or more virtual shields at the RFID self-service checkout station, the one or more virtual shields defining checkout bins, associating RFID readers to the checkout bins, and enabling an RFID reader associated with the checkout bins to differentiate between RFID tags attached to items positioned inside a checkout bin and RFID tags attached to items positioned outside the checkout bin by at least determining a signal strength of each RFID tag detected by the RFID reader and estimating, based on an outcome of the signal strength of each RFID tag, a distance between each RFID reader and each RFID tag.

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