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    Location estimation for wireless devices
    21.
    发明授权
    Location estimation for wireless devices 有权

    公开(公告)号：US09658315B2

    公开(公告)日：2017-05-23

    申请号：US14076531

    申请日：2013-11-11

    Applicant: Cisco Technology, Inc.

    Inventor： Santosh Pandey ,  Brian Donald Hart ,  Ilya Khasin

    IPC: G01S1/00 ,  G01S5/04 ,  G01S5/02 ,  G01S5/14 ,  H04W52/28 ,  H04W52/14 ,  H04W52/24

    CPC classification number: G01S5/04 ,  G01S5/021 ,  G01S5/0252 ,  G01S5/14 ,  H04W52/146 ,  H04W52/245 ,  H04W52/283

    Abstract: In an example embodiment, there is disclosed herein, an apparatus comprising an interface and location determination logic coupled with the interface. The location determination logic receives data representative of measured signal strengths for a wireless device from a plurality of receiving devices at known locations via the interface. The location determination logic determines an estimated location based on the measured signal strengths and a first transmit power for the wireless device. The location determination logic determines a revised transmit power for the wireless device based on the measured signal strengths from the plurality of devices at known locations and the estimated location. The location determination logic determines a revised estimated location based on the measured signal strengths and the revised transmit power for the wireless device.

    Mid-packet clear channel assessment
    22.
    发明授权
    Mid-packet clear channel assessment 有权
    中包清晰通道评估

    公开(公告)号：US08781040B2

    公开(公告)日：2014-07-15

    申请号：US13781822

    申请日：2013-03-01

    Applicant: Cisco Technology, Inc.

    Inventor： Raghuram Rangarajan ,  Brian Donald Hart ,  Paul J. Stager

    IPC: H04L29/06

    CPC classification number: H04L69/22 ,  H04L1/08 ,  H04L7/08 ,  H04L27/2607 ,  H04L27/2647 ,  H04L27/2656 ,  H04L27/2671 ,  H04L27/2679

    Abstract: A mid-packet detection technique is provided that detects a packet with periodic repetitions of a fixed duration at a point in time of the packet other than a start-of-packet pattern, e.g., a preamble, associated with the packet. The process performs packet detection without detecting a preamble and does not require carrier frequency recovery, timing recovery (synchronization) or channel estimation. In one embodiment, a doubly differential matched filter autocorrelation of the received signal is computed and used as a metric for packet detection when the preamble is not observed or to complement preamble detection. The metric is compared to a threshold to indicate detection of a packet.

    Abstract translation: 提供了一种中间包检测技术，其检测分组的周期性重复，该分组在分组的时间点不同于与分组相关联的分组开始模式（例如，前导码）。 该过程执行分组检​​测而不检测前导码，并且不需要载波频率恢复，定时恢复（同步）或信道估计。 在一个实施例中，计算接收信号的双差分匹配滤波器自相关，并将其用作当没有观察到前同步码时的分组检测的度量或用于对前导码检测进行补码。 将度量与阈值进行比较以指示分组的检测。

    Phase lock loop phase ambiguity mitigation for multi-link operation extrapolated sounding
    23.
    发明授权
    Phase lock loop phase ambiguity mitigation for multi-link operation extrapolated sounding 有权

    公开(公告)号：US12301385B2

    公开(公告)日：2025-05-13

    申请号：US18356550

    申请日：2023-07-21

    Applicant: Cisco Technology, Inc.

    Inventor： Matthew Aaron Silverman ,  Malcolm Muir Smith ,  Brian Donald Hart ,  Indermeet Singh Gandhi ,  John Matthew Swartz

    IPC: H04L25/02 ,  H04W88/08

    Abstract: The present disclosure is directed to simultaneous channel sounding on multiple MLO channels followed by determining phase and amplitude corrections based on channel impulse responses obtained on each MLO channel. The corrections are then used in subsequent extrapolation of channel sounding on one channel to another. In one aspect, a method includes transmitting, on each radio interface of a first multi-link device, a corresponding sounding probe to a second multi-link device; determining, by each radio interface of the first multi-link device, a corresponding channel impulse response based on the corresponding sound probe to yield a plurality of channel impulse responses; determining an offset between the plurality of channel impulse responses; and using the offset during a subsequent extrapolation of a sounding probe on one radio interface to a second radio interface of the first multi-link device.

    DETERMINING LOCATION VIA WIRELESS SIGNAL ATTRIBUTES
    30.
    发明申请
    DETERMINING LOCATION VIA WIRELESS SIGNAL ATTRIBUTES 审中-公开

    公开(公告)号：US20170325061A1

    公开(公告)日：2017-11-09

    申请号：US15662111

    申请日：2017-07-27

    Applicant: Cisco Technology, Inc.

    Inventor： Santosh Pandey ,  Rong Peng ,  Brian Donald Hart

    IPC: H04W4/02 ,  G01C21/26 ,  H04B17/318

    CPC classification number: H04W4/02 ,  G01C21/20 ,  H04B17/21 ,  H04B17/27 ,  H04B17/318 ,  H04B17/3913

    Abstract: Determining a location of a user device comprises a wireless system supported by wireless access points receiving signals from a user device. The wireless system estimates a location of the user device based on a coarse calculation based on an angle of arrival of the received signal and determines if the user device is in an area under a access point. If so, the wireless system performs a fine location calculation. The wireless system identifies received signal strength indicator values for the user device and uses the values and the calculated location of the user device to improve calibration of a received signal strength location model. If the system determines that the user is not in the area under the access point, the wireless system combines the coarse calculation location and a received signal strength determined location and estimates a location based on the combined calculations.

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