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公开(公告)号：US10997488B2
公开(公告)日：2021-05-04
申请号：US16825395
申请日：2020-03-20
IPC分类号： H04Q5/22 , G06K19/077 , G06K7/10 , H01Q1/22 , H04W4/35 , G06K19/067
摘要： A product tagging system is provided. The product tagging system includes at least one RF backscatter transmitter configured to emit a Radio Frequency (RF) signal on a frequency. The product tagging system further includes a plurality of passive RF backscatter tags, each associated with a respective product and configured to reflect and frequency shift the RF signal to a respective different frequency. The product tagging system also includes at least one RF backscatter receiver configured to read the respective product on the respective different frequency by detecting a distributed ambient backscatter signal generated by a reflection and frequency shifting of the RF signal by a corresponding one of the plurality of passive RF backscatter tags.
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公开(公告)号：US10943419B2
公开(公告)日：2021-03-09
申请号：US16689663
申请日：2019-11-20
IPC分类号： G07C9/00 , G07C9/28 , H01Q1/12 , E06B11/02 , G06K7/10 , H04W4/80 , E06B11/08 , G07C9/15 , G07C9/27
摘要： A walk-though gate (WTG) is presented. The WTG includes a WTG structure including a first wall and a second wall, the first and second walls defining a walk though pass way between an entrance and exit, at least one sensor located at the entrance and the exit of a cavity defined by the walk though pass way, at least one first antenna facing toward an inside region of the WTG structure, at least one second antenna facing away from the inside region of the WTG structure, an RFID reader connected to the at least one first and second antennas, and a judgement module to judge if an RFID tag is located inside or outside the walk though gate structure.
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公开(公告)号：US10931352B2
公开(公告)日：2021-02-23
申请号：US16591070
申请日：2019-10-02
IPC分类号： H04B7/06
摘要： A method for establishing communication links in a millimeter wave network is presented. The method includes determining an active communication link between first and second devices, the first device transmitting probing packets to the second device, employing a beam search technique to locate narrow beams by triggering the first device to adjust its transmission pattern to cover a fraction of an angular uncertainty region (AUR) at a beginning of a time-slot, and adjusting transmission coefficients of the first device based on a response received from the second device such that if the second device receives a probing packet, the second device sends an acknowledgment packet to the first device and the first device updates the AUR such that the AUR is set to a probed angular interval, and if the second device does not receive the probing packet, the first device updates the AUR to a complementary part of the probed interval.
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公开(公告)号：US10739452B2
公开(公告)日：2020-08-11
申请号：US15891906
申请日：2018-02-08
IPC分类号： G01S13/26 , G01S7/292 , G01S13/38 , G01S13/75 , G01S11/02 , G01S5/02 , G01S5/12 , G01S5/14 , G01S11/06 , G01S7/35 , G01S7/41 , G01S13/34 , G01S13/36 , G06K7/10 , G06K19/07
摘要： A system, method, and computer program product are provided for estimating a distance to an object. The system includes a transmitter for transmitting RF signals from a location of an object. The system further includes measurement equipment, including a receiver, for receiving the transmitted RF signals as corresponding received RF signals and measuring a plurality of phase differences at different frequencies between the transmitted RF signals and the corresponding received RF signals. The system also includes a processor. The processor is configured to calculate corrected phases by resolving one or more ambiguities from the plurality of phase differences. The processor is further configured to obtain a characteristic curve using the corrected phases. The processor is also configured to provide an estimate of the distance based on the characteristic curve and the corrected phases.
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公开(公告)号：US10582529B2
公开(公告)日：2020-03-03
申请号：US15915491
申请日：2018-03-08
摘要： A system is provided for speculative scheduling that includes a base station having a processor. The processor computes an overall schedule for a set of clients. The overall schedule is formed from a set of speculative schedules, is configured to maximize unlicensed spectrum usage, and is computed by (a) determining a speculative schedule for each resource block from a set of resource blocks in a given sub-frame based on statistics determined for the clients individually and jointly, and (b) selecting, for formation into the overall schedule, (i) a particular resource block and (ii) the speculative schedule for the particular resource block, that yield the maximum incremental utility relative to already determined speculative schedules for other resource blocks in the set, based on criteria including uplink access statistics. The processor executes the overall schedule responsive to a completion of the speculative schedule determination for each resource block in the given sub-frame.
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公开(公告)号：US20200050807A1
公开(公告)日：2020-02-13
申请号：US16517941
申请日：2019-07-22
IPC分类号： G06K7/10
摘要： Systems and methods for sequential detection-based classifications of radio-frequency identification (RFID) tags in three-dimensional space are provided. The methods include modeling a response from RFID tags as a probabilistic macro-channel and interrogating an RFID tag by transmitting a series of packets. Each packet is a transmit symbol and a first series of packet is a transmitted codeword. The method includes receiving, from the RFID tag, a second series of packets that is a received codeword in response to the transmitted codeword and finding a jointly typical transmit and receive codeword across all classes of macro-channels. The method also includes declaring a class of the RFID tag based on a largest likelihood between the transmitted codeword and the received codeword.
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公开(公告)号：US20190311162A1
公开(公告)日：2019-10-10
申请号：US16376039
申请日：2019-04-05
IPC分类号： G06K7/10
摘要： 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.
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公开(公告)号：US10405209B2
公开(公告)日：2019-09-03
申请号：US15915436
申请日：2018-03-08
摘要： 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.
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公开(公告)号：US10346655B2
公开(公告)日：2019-07-09
申请号：US15833995
申请日：2017-12-06
发明人： Eugene Chai , Swadhin Pradhan , Sampath Rangarajan , Mohammad Khojastepour , Karthikeyan Sundaresan
摘要： 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.
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公开(公告)号：US10292059B2
公开(公告)日：2019-05-14
申请号：US15874016
申请日：2018-01-18
摘要： 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.
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