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公开(公告)号：US20190158157A1
公开(公告)日：2019-05-23
申请号：US15819254
申请日：2017-11-21
Applicant: Cisco Technology, Inc.
Inventor： Xiaoli Ma , Hongyi Fu , Brian D. Hart , Matthew A. Silverman
IPC: H04B7/0452 , H04L25/02 , H04L27/26
Abstract: A wireless device, such as an wireless access point, receives signals detected by a plurality of antennas of a wireless device to produce a plurality of antenna-specific receive signals potentially representing a wireless transmission received from each of one or a plurality of devices. A signal processing component of the wireless device, such as a modem, performs several operations on the antenna-specific receive signals, including building a first space-time equalizer to be applied to the plurality of antenna-specific receive signals to recover a transmission from a first device by both equalizing channel effects and canceling out effects associated with transmissions from devices other than the first device, and building a second space-time equalizer to be applied to the plurality of antenna-specific receive signals to recover a transmission from a second device by both equalizing channel effects and canceling out effects associated with transmissions from devices other than the second device.
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92.发明授权公开(公告)号：US10285148B2
公开(公告)日：2019-05-07
申请号：US15582024
申请日：2017-04-28
Applicant: Cisco Technology, Inc.
Inventor： Paul J. Stager , David S. Kloper , Brian D. Hart , Matthew A. Silverman
IPC: H04W56/00
Abstract: Techniques are disclosed to synchronize wireless signal transmission by endpoints controlled by a central controller. For example, an example method of wireless communication includes receiving, at a first device, over a wired medium between the first device and a second device, a plurality of packets from the second device. Each of the plurality of packets comprises data representative of a portion of a signal corresponding to a wireless medium. The method further includes receiving, at the first device, from the second device over the wired medium a synchronization signal based on a common master clock at the second device. The method further includes synchronizing, at the first device, a local clock of the first device to the common master clock based on the synchronization signal. The method further includes reconstructing the signal corresponding to the wireless medium based on the plurality of packets and the synchronized local clock.
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公开(公告)号：US10277293B1
公开(公告)日：2019-04-30
申请号：US15819254
申请日：2017-11-21
Applicant: Cisco Technology, Inc.
Inventor： Xiaoli Ma , Hongyi Fu , Brian D. Hart , Matthew A. Silverman
IPC: H04B7/0452 , H04L25/02 , H04L27/26
Abstract: A wireless device, such as an wireless access point, receives signals detected by a plurality of antennas of a wireless device to produce a plurality of antenna-specific receive signals potentially representing a wireless transmission received from each of one or a plurality of devices. A signal processing component of the wireless device, such as a modem, performs several operations on the antenna-specific receive signals, including building a first space-time equalizer to be applied to the plurality of antenna-specific receive signals to recover a transmission from a first device by both equalizing channel effects and canceling out effects associated with transmissions from devices other than the first device, and building a second space-time equalizer to be applied to the plurality of antenna-specific receive signals to recover a transmission from a second device by both equalizing channel effects and canceling out effects associated with transmissions from devices other than the second device.
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公开(公告)号：US10243665B2
公开(公告)日：2019-03-26
申请号：US15722083
申请日：2017-10-02
Applicant: Cisco Technology, Inc.
Inventor： Fred J. Anderson , Oscar Bejarano Chavez , Matthew A. Silverman , Paul J. Stager
IPC: H04B10/564 , H04W52/02 , H04B7/024 , H04B10/079
Abstract: Presented herein are techniques to ensure power emitted by APs during a cooperative MIMO transmission is within certain limits. For a transmission to be made from two or more wireless access points using cooperative multiple-input multiple-output (MIMO) techniques, a measure of separation is determined between the two or more access points. Precoding of signals to be transmitted by the two or more access points is adjusted so as to derate the signals to be transmitted or disable the cooperative nature of the transmission from the two or more access point depending on the measure of separation so that a combined output power from the two or more access points is within a limit.
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95.发明申请公开(公告)号：US20180324858A1
公开(公告)日：2018-11-08
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
CPC classification number: H04W74/0816 , H04L1/0002 , H04L1/0007 , H04L2001/0092 , H04W74/004 , H04W74/006 , H04W88/085
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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Patent Agency Ranking
公开(公告)号：US10075976B2
公开(公告)日：2018-09-11
申请号：US15150708
申请日：2016-05-10
Applicant: Cisco Technology, Inc.
Inventor： Brian D Hart , David Kloper , Pooya Monajemi , Matthew A. Silverman
CPC classification number: H04W74/08 , H04L1/00 , H04L5/0055 , H04W52/228 , H04W52/245 , H04W52/367 , H04W52/46 , H04W72/0473 , H04W74/0808
Abstract: A third device stores a receive signal strength of a received response data unit transmitted by a second device in response to reception by the second device of a first data unit transmitted by a first device, obtains a clear channel access parameter included in a header of a second data unit transmitted by the first device to the second device. The clear channel access parameter is based on a sum of a transmit power used by the first device to transmit the second data unit to the second device and a receive signal strength of the response data unit at the first device. The third device determines a transmit power to be used by the third device to send a transmission to the fourth device based on transmission exchanges between devices in a particular service set.
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公开(公告)号：US20170346547A1
公开(公告)日：2017-11-30
申请号：US15496056
申请日：2017-04-25
Applicant: Cisco Technology, Inc.
Inventor： Paul J. Stager , Matthew A. Silverman , Brian D. Hart , David Kloper
IPC: H04B7/08 , H04B1/10 , H04B7/0452 , H04W88/08
CPC classification number: H04B7/0885 , H04B1/1036 , H04B7/024 , H04B7/0452 , H04L25/03 , H04L43/16 , H04W88/085
Abstract: A system and method are provided for performing stomp-and-restart techniques in distributed MU-MIMO system. A plurality of radio head devices are provided that are configured to be deployed separated from each other in a coverage region of interest of a wireless network. A central processor subsystem is provided that is in communication with the plurality of radio head devices. The central processor subsystem configured to perform several operations based on downconverted samples received from the plurality of radio head devices.
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公开(公告)号：US09655057B2
公开(公告)日：2017-05-16
申请号：US14446993
申请日：2014-07-30
Applicant: Cisco Technology, Inc.
Inventor： John Matthew Swartz , Joshua Suhr , Matthew A. Silverman , Paul J. Stager
CPC classification number: H04W52/241 , H04W52/143 , H04W52/223 , H04W52/242 , H04W52/245 , H04W52/40 , H04W52/50 , H04W84/12
Abstract: Apparatus and techniques are presented for estimating a noise floor experienced by a client device seeking to associate with an access point in a wireless network. A path loss between the client device and the access point may be estimated. A metric may then be generated, where the metric estimates a strength of a signal transmitted from the access point as received at the client device. The transmit power at the access point may then be adjusted, based on the metric.
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公开(公告)号：US20170135131A1
公开(公告)日：2017-05-11
申请号：US15150708
申请日：2016-05-10
Applicant: Cisco Technology, Inc.
Inventor： Brian D. Hart , David Kloper , Pooya Monajemi , Matthew A. Silverman
CPC classification number: H04W74/08 , H04L1/00 , H04L5/0055 , H04W52/228 , H04W52/245 , H04W52/367 , H04W52/46 , H04W72/0473 , H04W74/0808
Abstract: A third device stores a receive signal strength of a received response data unit transmitted by a second device in response to reception by the second device of a first data unit transmitted by a first device, obtains a clear channel access parameter included in a header of a second data unit transmitted by the first device to the second device. The clear channel access parameter is based on a sum of a transmit power used by the first device to transmit the second data unit to the second device and a receive signal strength of the response data unit at the first device. The third device determines a transmit power to be used by the third device to send a transmission to the fourth device based on transmission exchanges between devices in a particular service set.
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100.发明授权High density deployment using transmit or transmit-receive interference suppression with selective channel dimension reduction/attenuation and other parameters 有权使用发射或发射接收干扰抑制的高密度部署，具有选择性的信道尺寸减小/衰减和其他参数公开(公告)号：US09332557B2
公开(公告)日：2016-05-03
申请号：US14600300
申请日：2015-01-20
Applicant: Cisco Technology, Inc.
Inventor： Paul J. Stager , Matthew A. Silverman , Zhigang Gao , John Blosco , Raghuram Rangarajan
CPC classification number: H04W72/082 , H04L5/0073 , H04W24/02 , H04W72/0426 , H04W72/046 , H04W84/12 , H04W88/08
Abstract: In a wireless local area network, each of multiple access points, in a high density deployment, are configured to suppress co-channel interference. A first access point having a plurality of antennas beamforms a transmission to a wireless client device within a null-space or with the weakest singular eigenmodes of a wireless channel between the first access point and at least one co-channel second access point. Techniques are presented herein for situations in which any given access point has two or more co-channel access points. In addition, an access point may perform receive side suppression with respect to a transmission (made by a co-channel access point to one of its associated wireless client devices) that is received from that co-channel access point.
Abstract translation: 在无线局域网中，高密度部署中的多个接入点中的每一个被配置为抑制同信道干扰。 具有多个天线的第一接入点波束在零空间内或在第一接入点与至少一个同频道第二接入点之间的无线信道的最弱奇异本征模式中形成向无线客户端设备的传输。 本文给出了任何给定接入点具有两个或更多个同频道接入点的情况的技术。 此外，接入点可以对从该同频道接入点接收到的传输（由与其相关联的无线客户端设备之一的同频道接入点进行的）进行接收侧抑制。
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