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    Mid-packet clear channel assessment
    11.
    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。

    Cooperative sounding based on coherent subcarrier assignments
    14.
    发明授权
    Cooperative sounding based on coherent subcarrier assignments 有权

    公开(公告)号：US11412502B2

    公开(公告)日：2022-08-09

    申请号：US16810671

    申请日：2020-03-05

    Applicant: Cisco Technology, Inc.

    Inventor： Pooya Monajemi ,  Matthew A. Silverman ,  Gautam D. Bhanage ,  Paul J. Stager ,  Fred J. Anderson

    IPC: H04W72/04

    Abstract: Techniques for efficient network probing are provided. Coherence data is received from a plurality of access points (APs), where the coherence data indicates, for each respective AP of the plurality of APs, coherence bandwidth for a plurality of subcarriers. A mapping is generated indicating, for each of the plurality of APs, sets of subcarriers that can be interchangeably sounded. Two or more APs of the plurality of APs that can jointly sound a first subcarrier of the plurality of subcarriers are then identified based on the mapping, and the first subcarrier is allocated to the identified two or more APs for future sounding.

    Enabling distributed access points on high bandwidth cables for band and antenna splitting
    16.
    发明授权
    Enabling distributed access points on high bandwidth cables for band and antenna splitting 有权

    公开(公告)号：US10601475B2

    公开(公告)日：2020-03-24

    申请号：US16383915

    申请日：2019-04-15

    Applicant: Cisco Technology, Inc.

    Inventor： Brian D. Hart ,  Paul J. Stager ,  David Kloper ,  Jie Cheng Jiang

    IPC: H04W72/04 ,  H04B7/0452 ,  H04B7/024 ,  H04W84/12 ,  H04W88/08

    Abstract: A wireless access point device wirelessly communicates with a plurality of wireless client devices. The wireless access point includes a central processor subsystem and a plurality of transceiver devices each including a plurality of antennas, and a plurality of radio transceivers, each of the plurality of transceiver devices configured for deployment throughout a coverage area, each transceiver device being connected to the central processor subsystem via a respective cable. The central processor subsystem distributes in-phase and quadrature baseband samples across the plurality of transceiver devices associated with traffic to be transmitted and received via the plurality of transceiver devices in one or more frequency bands so as to synthesize a wideband multiple-input multiple-output transmission channel and a wideband multiple-input multiple-output reception channel. The access point transmit and receive functions are “split” or partitioned across the plurality of transceivers devices.

    Filter design for access points
    17.
    发明授权
    Filter design for access points 有权

    公开(公告)号：US10340975B2

    公开(公告)日：2019-07-02

    申请号：US15379726

    申请日：2016-12-15

    Applicant: Cisco Technology, Inc.

    Inventor： Matthew A. Silverman ,  Paul J. Stager ,  John Blosco ,  Corey D. Metsker

    IPC: H04W88/08 ,  H04B1/525 ,  H04B1/10 ,  H04W84/12

    Abstract: Receiving filter design that reduces out-of-channel interference for APs is disclosed. An AP includes a first radio and a second radio disposed in a body of the AP. The first radio transmits first signals in a frequency band while the second radio receives second signals in the same frequency band. The AP includes an interference mitigation controller that determines a receiving filter for the second radio to mitigate interference between the first radio and the second radio based on the second signals received by the second radio when the first radio transmits the first signals in the frequency band. The interference mitigation controller applies the receiving filter to signals received by the second radio during a time period that the first radio is transmitting signals in the frequency band while the second radio is receiving signals in the frequency band.

    Collision detection and avoidance mechanism using distributed radio heads in a wireless network
    18.
    发明授权
    Collision detection and avoidance mechanism using distributed radio heads in a wireless network 有权

    公开(公告)号：US10306675B2

    公开(公告)日：2019-05-28

    申请号：US15585400

    申请日：2017-05-03

    Applicant: Cisco Technology, Inc.

    Inventor： David Kloper ,  Brian D. Hart ,  Matthew A. Silverman ,  Paul J. Stager

    IPC: H04W74/08 ,  H04W74/00 ,  H04L1/00 ,  H04W88/08

    Abstract: A central processor subsystem controls multiple transceivers. Each transceiver transmits protocol data units from antennas of that transceiver and produces receive waveforms from wirelessly received signals at the one or more antennas. A transmit waveform, including a frame addressed to one or more wireless client devices, is sent through a first transceiver to be transmitted wirelessly by the first transceiver on a frequency channel. A receive waveform, representative of the transmission by the first transceiver and wirelessly received at a second transceiver, is received from the second transceiver. While the transmit waveform is being sent to the first transceiver: a level of collision between the receive waveform and another transmission on the frequency channel is detected; and if the level of collision exceeds a threshold prior to an end of the receive waveform, the transmit waveform being sent to the first transceiver is modified to reduce the collision.

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