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    System for in-situ detection of electrical faults
    3.
    发明授权
    System for in-situ detection of electrical faults 有权

    公开(公告)号：US11888306B1

    公开(公告)日：2024-01-30

    申请号：US17660366

    申请日：2022-04-22

    Applicant: AMAZON TECHNOLOGIES, INC.

    Inventor： Cyril Arokiaraj Arool Emmanuel ,  David Buuck ,  Behrad Aria ,  Mark Armin Patel

    IPC: H02H3/08 ,  H02H5/00 ,  G01J1/42

    CPC classification number: H02H3/08 ,  G01J1/429 ,  H02H5/00

    Abstract: Electrical faults pose a significant risk to people and property. A system is described that deploys instrument devices with sensors to detect faults within an alternating current (AC) electrical distribution system. These sensors may detect electrical, optical, thermal, acoustic, radio frequency, and other phenomena associated with a fault. Data from different sensors may also be used to distinguish fault and non-fault status. Users are notified if a fault status is detected. Mitigating actions may be automatically taken, such as de-energizing a branch circuit associated with the fault status. Information about non-fault status may also be used to mitigate nuisance circuit breaker interruptions. In some situations, a nuisance interruption of a breaker may be automatically reset if all instrument devices connected to the breaker reported non-fault status before the interruption.

    Band edge performance optimization technology for orthogonal frequency-division modulation (OFDM) based radios
    4.
    发明授权
    Band edge performance optimization technology for orthogonal frequency-division modulation (OFDM) based radios 有权

    公开(公告)号：US10785704B1

    公开(公告)日：2020-09-22

    申请号：US16212464

    申请日：2018-12-06

    Applicant: Amazon Technologies, Inc.

    Inventor： Cyril Arokiaraj Arool Emmanuel ,  Gokul Ramsubbaraj

    IPC: H04W48/06 ,  H04B17/382 ,  H04B17/336 ,  H04W48/16 ,  H04L27/26 ,  H04B17/327 ,  H04L5/00 ,  H04J11/00 ,  H04W72/04

    Abstract: Technologies to improve band edge channel performance for radios are described. One device includes a baseband processor with an Orthogonal Frequency Division Multiplexing (OFDM) physical layer (PHY) parameter structure. The OFDM PHY layer parameter structure includes first parameter information that controls operation of an OFDM PHY in a first mode. The baseband processor establishes a wireless communication link with a second device and transmits first data to the second device in the first mode using a transmit power level. The baseband processor determines that the device is connected with the second device on a band edge channel that is adjacent to a restricted frequency band. The baseband processor modifies the first parameter information to second parameter information, the second parameter information controls operation of the OFDM PHY in a second mode. The baseband processor transmits transmit second data to the second device in the second mode using the transmit power level.

    Calibrating radar systems for movement detection
    5.
    发明授权
    Calibrating radar systems for movement detection 有权

    公开(公告)号：US11841455B1

    公开(公告)日：2023-12-12

    申请号：US17150227

    申请日：2021-01-15

    Applicant: Amazon Technologies, Inc.

    Inventor： Cyril Arokiaraj Arool Emmanuel ,  Seyed Yahya Mortazavi

    IPC: G01S7/03 ,  G01S7/40

    CPC classification number: G01S7/038 ,  G01S7/40 ,  G01S7/4021

    Abstract: Techniques for calibrating radar systems to remove undesirable effects of mutual coupling where radar receivers absorb energy emitted from nearby transmitters (e.g., leakage). Electronic devices may have radar systems that have multiple transmit antennas and multiple receive antennas, or Multiple-Input Multiple-Output (MIMO) radar systems. Electronic devices with MIMO radar systems may have closely spaced transmitter and receiver arrays with poor radio frequency (RF) isolation. Poor RF isolation may lead non-linearities in the receiver chain, which in turn leads to an increase in receiver noise floor that degrades the radar performance. The calibration process(es) described herein include identifying the receiver noise floor for the environment of the electronic device. The transmitter and/or receiver gain may then be fine-tuned to account for the noise floor such that the effects of poor RF isolation are substantially removed from the representations of objects in the environment created using the radar systems.

    Adaptive guard interval using channel impulse response data
    6.
    发明授权
    Adaptive guard interval using channel impulse response data 有权

    公开(公告)号：US11652672B1

    公开(公告)日：2023-05-16

    申请号：US17206995

    申请日：2021-03-19

    Applicant: Amazon Technologies, Inc.

    Inventor： Cyril Arokiaraj Arool Emmanuel ,  Satyabh Mishra

    IPC: H04L25/02 ,  H04L27/26

    CPC classification number: H04L25/025 ,  H04L25/022 ,  H04L25/0212 ,  H04L27/2607

    Abstract: A method and system to determine an adjusted guard interval duration associated with a wireless signal transmitted via a wireless communication link between a first network device and a second network device in a wireless network. The second network device receives a first wireless signal including a first duration of a guard interval from the first network device at a first time. The second network device determines, in view of the set of pilot symbols, a channel impulse response. A channel parameter value is determined based on the channel impulse response. An adjusted guard interval duration corresponding to the channel parameter value is established and used to estimate a second physical rate of the link. The second network device provides a communication identifying the adjusted guard interval duration to the first network device in response to determining the second physical rate is greater than the first physical rate.

    System for limiting interference to a wireless radio of a computing device
    7.
    发明授权
    System for limiting interference to a wireless radio of a computing device 有权

    公开(公告)号：US10382075B1

    公开(公告)日：2019-08-13

    申请号：US15717584

    申请日：2017-09-27

    Applicant: AMAZON TECHNOLOGIES, INC.

    Inventor： Cyril Arokiaraj Arool Emmanuel ,  Gokul Ramsubbaraj

    IPC: H04B1/04 ,  H04B7/06 ,  H04B1/00

    Abstract: Described are techniques for reducing the effects of interference from one wireless radio on the operations of another wireless radio. A first wireless radio and a second wireless radio may transmit signals within frequency ranges that at least partially overlap. Signal quality values for the first wireless radio, at a time that the second wireless radio is transmitting signals, may be determined for at least a portion of the overlapping frequencies. For each frequency at which the determined signal quality value deviates from a threshold value, that frequency may be excluded from use for subsequent communications by the first wireless radio. Excluding certain frequencies from use may enable continuous use of the first wireless radio without experiencing the effects of interference from the second wireless radio.

    Interference mitigation in short-range wireless communication
    9.
    发明授权
    Interference mitigation in short-range wireless communication 有权

    公开(公告)号：US10218450B1

    公开(公告)日：2019-02-26

    申请号：US15949462

    申请日：2018-04-10

    Applicant: Amazon Technologies, Inc.

    Inventor： Gokul Ramsubbaraj ,  Cyril Arokiaraj Arool Emmanuel

    IPC: H04B5/00 ,  H04B17/00 ,  H04M1/00 ,  H04B15/00 ,  H04W4/80

    Abstract: Systems and techniques are described for mitigating interference in wireless communication devices. In various examples, a device may determine a first energy level of a first received wireless signal and may determine that the first energy level is above a first threshold. The device may attenuate the first received wireless signal by a first amount. The device may filter the first received wireless signal with a band pass filter with a first passband frequency range. The device may be effective to program the band pass filter with the first passband frequency range based on the detected first energy level exceeding the first threshold.

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