公开(公告)号：US09055449B2

公开(公告)日：2015-06-09

申请号：US13691912

申请日：2012-12-03

Applicant: Cisco Technology, Inc.

Inventor： Matthew A. Silverman ,  Jeffrey R. Adams ,  David Kloper ,  Yanxin Na ,  Narayan Vishwanathan ,  Daniel Wee

IPC: H04B1/00 ,  H04B15/00 ,  H04W16/28

CPC classification number: H04W16/28 ,  H04B7/0626 ,  H04B7/0634

Abstract: A channel sounding scheme is presented herein that relies on a combination of a first channel sounding procedure and a second channel sounding procedure. The first channel sounding technique is one that involves an exchange of dedicated channel sounding related signals to determine channel conditions between the first wireless communication device and the particular second wireless communication device. The second channel sounding technique is one in which channel conditions are implicitly discovered from any signals transmitted by the particular second wireless communication device to the first wireless communication device. A first wireless communication device computes updates to steering matrix information used for beamforming one or more signal streams to a particular second wireless communication device based on a combination of the first channel sounding technique and the second channel sounding technique.

Abstract translation: 此处呈现依赖于第一声道探测程序和第二声道探测程序的组合的声道探测方案。 第一通道探测技术是涉及专用信道探测相关信号的交换以确定第一无线通信设备和特定第二无线通信设备之间的信道状况的技术。 第二信道探测技术是从特定的第二无线通信设备向第一无线通信设备发送的任何信号隐含地发现信道条件的方法。 第一无线通信设备基于第一信道探测技术和第二信道探测技术的组合，计算用于将一个或多个信号流波束成形到特定第二无线通信设备的导引矩阵信息的更新。

公开(公告)号：US08976761B2

公开(公告)日：2015-03-10

申请号：US13645565

申请日：2012-10-05

Applicant: Cisco Technology, Inc.

Inventor： Paul J. Stager ,  Matthew A. Silverman ,  Zhigang Gao ,  John Blosco ,  Raghuram Rangarajan

IPC: H04W4/00

CPC classification number: H04W72/082 ,  H04L5/0073 ,  H04W24/02 ,  H04W72/0426 ,  H04W72/046 ,  H04W84/12 ,  H04W88/08

Abstract: In a wireless local are 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: 在无线本地是网络中，以高密度部署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，接入点可以针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。

公开(公告)号：US20150003261A1

公开(公告)日：2015-01-01

申请号：US13928452

申请日：2013-06-27

Applicant: Cisco Technology, Inc.

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

IPC: H04W24/08 ,  H04B7/04

CPC classification number: H04W24/08 ,  H04B7/0452 ,  H04B7/0456 ,  H04L1/203 ,  H04L1/24 ,  H04L2025/03426 ,  H04W24/06

Abstract: A first device having a plurality of antennas wirelessly transmits multiple series of test packets to a second device having one or more antennas, each series of test packets being transmitted with a different level of interference imposed on the test packets. The first device determines a packet error rate for each series of test packets transmitted by the first device. The first device derives an estimate of an interference cancellation capability of the second device based on the packet error rate for different levels of interference.

Abstract translation: 具有多个天线的第一设备将具有一个或多个天线的第二设备无线地发射多个测试分组，每一组测试分组以不同的干扰等级施加在测试分组上。 第一设备确定由第一设备发送的每一系列测试分组的分组错误率。 第一设备基于不同级别的干扰的分组错误率导出第二设备的干扰消除能力的估计。

公开(公告)号：US20140328247A1

公开(公告)日：2014-11-06

申请号：US13874657

申请日：2013-05-01

Applicant: CISCO TECHNOLOGY, INC.

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

IPC: H04L25/02

CPC classification number: H04L25/0228 ,  H04L25/0204

Abstract: A first device explicitly sounds a wireless channel with respect to a second device even when the second device cannot sound all the antenna/transmit paths of the first device. The first device has a first plurality of antennas and corresponding transmitters and the second device has a second plurality antennas and corresponding receivers. The first device wirelessly transmits a plurality of sounding frames to the second device such that at least one of the first plurality of antennas is kept constant across the plurality of sounding frames. The first device receives from the second device at least one feedback message containing channel matrix information derived from reception of the sounding frames at the second plurality of antennas of the second device. The first device derives a full wireless channel estimate between the first plurality of antennas of the first device and the second plurality of antennas of the second device.

Abstract translation: 即使当第二设备不能听到第一设备的所有天线/发射路径时，第一设备也明确地听到关于第二设备的无线信道。 第一设备具有第一多个天线和对应的发射机，并且第二设备具有第二多个天线和对应的接收机。 第一设备将多个探测帧无线发射到第二设备，使得第一多个天线中的至少一个天线在多个探测帧之间保持恒定。 所述第一设备从所述第二设备接收包含从所述第二设备的第二多个天线处的所述探测帧的接收导出的信道矩阵信息的至少一个反馈消息。 第一设备在第一设备的第一多个天线和第二设备的第二多个天线之间导出完整的无线信道估计。

公开(公告)号：US20140327579A1

公开(公告)日：2014-11-06

申请号：US13886533

申请日：2013-05-03

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Brian Donald Hart ,  Paul J. Stager ,  Santosh Pandey ,  David Kloper ,  Dan Lyons ,  Matthew A. Silverman

IPC: G01S3/38

CPC classification number: G01S3/38 ,  G01S1/68 ,  G01S3/48 ,  H04W64/006

Abstract: In one embodiment, an apparatus includes a plurality of antennas, a receiver in communication with said plurality of antennas for receiving one or more packets in a block based modulation environment, a switch interposed between a portion of the antennas and the receiver for switching between the antennas, and a processor for calculating angle of arrival for use in identifying a location of a mobile device transmitting the one or more packets.

Abstract translation: 在一个实施例中，一种装置包括多个天线，与所述多个天线通信的接收机，用于在基于块的调制环境中接收一个或多个分组，插入在天线的一部分和接收机之间用于在 天线和用于计算到达角的处理器，用于识别发送一个或多个分组的移动设备的位置。