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公开(公告)号：US09551775B2
公开(公告)日：2017-01-24
申请号：US14476997
申请日：2014-09-04
Applicant: Cisco Technology, Inc.
Inventor： Raghuram Rangarajan , Brian D. Hart
CPC classification number: G01S1/08 , G01S5/0226 , G01S5/0252 , H04W4/02 , H04W4/80 , H04W84/12
Abstract: A computing entity, such as a server, obtains a first, second, and third set of measurements based on wireless transmissions between one or more beacon devices, a wireless client device, and one or more wireless access points in a wireless network. The first set of measurements is associated with wireless transmissions from the beacon device(s) received at the wireless access points. The second set of measurements is associated with wireless transmissions between the wireless client device and the wireless access points. The third set of measurements is associated with wireless transmissions from beacon devices received at the wireless client device. An estimated location of the wireless client device is generated based on the first set of measurement data, the second set of measurement data, and the third set of measurement data.
Abstract translation: 诸如服务器的计算实体基于无线网络中的一个或多个信标设备，无线客户端设备和一个或多个无线接入点之间的无线传输来获得第一，第二和第三测量集合。 第一组测量与来自在无线接入点处接收的信标设备的无线传输相关联。 第二组测量与无线客户端设备和无线接入点之间的无线传输相关联。 第三组测量与在无线客户端设备处接收的信标设备的无线传输相关联。 基于第一组测量数据，第二组测量数据和第三组测量数据来生成无线客户端设备的估计位置。
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公开(公告)号：US09408036B2
公开(公告)日：2016-08-02
申请号：US14278546
申请日：2014-05-15
Applicant: Cisco Technology, Inc.
Inventor： Brian D. Hart , Raghuram Rangarajan , Sujai Hajela , Gregory H. Yamanishi , Gracia Wang , Allen J. Huotari
Abstract: Wireless transmissions from beacon devices are received at a plurality of receiver devices. The wireless transmissions comprise packets that carry information used for location-based services for mobile wireless devices. Content of one or more fields of the beacon packets received by one or more of the plurality of receiver devices is obtained. Measurement data associated with the transmissions received at the plurality of receiver devices is generated. Locations of the respective beacon devices are computed from the measurement data obtained by the plurality of receiver devices. Information identifying detected beacon devices and their locations are stored to maintain a location history of beacon devices over time locations. Changes from information contained in the location history are detected based on the locations computed for respective beacon devices from the measurement data and content of one or more fields of detected beacon packets.
Abstract translation: 在多个接收机设备处接收来自信标设备的无线传输。 无线传输包括携带用于移动无线设备的基于位置的服务的信息的分组。 获得由多个接收机设备中的一个或多个接收的信标分组的一个或多个字段的内容。 产生与在多个接收机设备处接收的传输相关联的测量数据。 根据由多个接收机设备获得的测量数据计算各个信标设备的位置。 识别检测到的信标设备及其位置的信息被存储以维持随着时间位置的信标设备的位置历史。 基于从测量数据和检测到的信标分组的一个或多个字段的内容的各个信标设备计算的位置来检测位置历史中包含的信息的变化。
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公开(公告)号：US09143370B2
公开(公告)日：2015-09-22
申请号：US14037807
申请日：2013-09-26
Applicant: Cisco Technology, Inc.
Inventor： Zhigang Gao , Raghuram Rangarajan , David Kloper
CPC classification number: H04L25/063
Abstract: Techniques are presented herein for distinguishing between the DC component of a real signal and DC energy of a received signal due to the radio receiver circuitry. Samples are obtained of a received signal derived from output of a receiver of a communication device. A mean of the samples is computed over a sample window comprising a predetermined number of samples. First and second thresholds are provided, the first threshold being greater than the second threshold. An absolute value of the mean is compared with respect to the first threshold and the second threshold as samples are obtained in the sample window. A selection is made between the first threshold and the second threshold for purposes of comparison with the absolute value of the mean to determine whether energy at DC is a true/real DC component of the received signal or is due to circuitry of the receiver.
Abstract translation: 这里给出了用于区分由无线电接收器电路引起的实际信号的DC分量和接收信号的DC能量之间的技术。 获得从通信设备的接收机的输出得到的接收信号的样本。 在包含预定数量的样本的样本窗口上计算样本的平均值。 提供第一和第二阈值，第一阈值大于第二阈值。 将平均值的绝对值相对于第一阈值和第二阈值进行比较，因为样本窗口中获取样本。 在第一阈值和第二阈值之间进行选择，以便与平均值的绝对值进行比较，以确定DC处的能量是否是接收信号的真实/真实DC分量，或者是由于接收机的电路。
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公开(公告)号：US20150009947A1
公开(公告)日：2015-01-08
申请号：US13933456
申请日：2013-07-02
Applicant: Cisco Technology, Inc.
Inventor： Raghuram Rangarajan , Paul Stager , David S. Kloper
IPC: H04L5/00
CPC classification number: H04L5/0062 , H04L5/0037 , H04L5/0064 , H04L27/0006
Abstract: In an example embodiment, a channel that includes a plurality of sub-channels is sampled to detect pulses indicative of a presence of a radar signal. A frequency for the radar signal is determined. If the frequency of the radar signal maps to a selected subset of the plurality of sub-channels, the selected subset of the plurality of sub-channels are determined to be unavailable due to radar, while the remaining sub-channels remain available for use. The selected subset of the plurality of sub-channels determined to be unavailable due to radar may be selectively returned for use after the radar signal is no longer detected for a predetermined selected time period.
Abstract translation: 在示例实施例中，对包括多个子信道的信道进行采样以检测指示雷达信号的存在的脉冲。 确定雷达信号的频率。 如果雷达信号的频率映射到多个子信道的所选择的子集，则由于雷达，多个子信道的所选择的子集被确定为不可用，而其余子信道保持可用。 在预定的选定时间段内不再检测到雷达信号之后，由于雷达而被确定为不可用的多个子信道的所选子集可被选择返回使用。
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5.发明申请Concurrent On-Channel Servicing of Wireless Client Traffic and Off-Channel Pre-Scanning for Radar in a Wireless Access Point 有权无线接入点无线客户端流量和雷达无线通道预扫描的并发通道服务公开(公告)号：US20160073403A1
公开(公告)日：2016-03-10
申请号：US14479521
申请日：2014-09-08
Applicant: Cisco Technology, Inc.
Inventor： David Kloper , Raghuram Rangarajan , Greg Corsetto
Abstract: An access point (AP) includes a transceiver to service wireless client traffic on wireless channels within a channel bandwidth. The AP services wireless client traffic in a first channel bandwidth and sets a receiver bandwidth to include the first channel bandwidth and a second channel bandwidth initially not available for servicing wireless client traffic. Concurrent with servicing the wireless client traffic in the first channel bandwidth, the AP searches the second channel bandwidth for any interference signal. If no interference signal is found in the second channel bandwidth, the AP declares the second channel bandwidth free of interference.
Abstract translation: 接入点（AP）包括收发信机以在信道带宽内的无线信道上服务无线客户端业务。 AP服务无线客户端在第一信道带宽中的业务，并且设置接收机带宽以包括第一信道带宽和最初不可用于服务无线客户端业务的第二信道带宽。 与第一通道带宽中的无线客户端业务服务同时，AP在第二信道带宽上搜索任何干扰信号。 如果在第二信道带宽中没有发现干扰信号，则AP声明第二信道带宽没有干扰。
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Patent Agency Ranking
6.发明申请High Density Deployment Using Transmit or Transmit-Receive Interference Suppression with Selective Channel Dimension Reduction/Attenuation and Other Parameters 审中-公开使用发射或发射接收干扰抑制与选择性信道尺寸减小/衰减和其他参数的高密度部署公开(公告)号：US20150131593A1
公开(公告)日：2015-05-14
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。
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公开(公告)号：US09258713B2
公开(公告)日：2016-02-09
申请号：US14278555
申请日：2014-05-15
Applicant: Cisco Technology, Inc.
Inventor： Raghuram Rangarajan , Brian D. Hart , Sujai Hajela , Santosh Pandey , David Kloper , Greg Corsetto , Allen J. Huotari
CPC classification number: H04W12/08 , H04W4/80 , H04W12/12 , H04W64/003
Abstract: Techniques are presented for detecting rogue wireless beacon devices. Wireless transmissions from beacon devices are received at a plurality of receiver devices. The wireless transmissions of the beacon devices comprise packets that carry information used for location-based services for mobile wireless devices. Content of one or more fields of the packets transmitted by the beacon devices and received by one or more of the receiver devices is obtained. The content of one or more fields of the packets is analyzed to detect an unauthorized beacon device. The analyzing operation may involve comparing the content of the one or more fields of the packets against a list that contains one or more identifiers for authorized beacon devices. In another form, analyzing may involve analyzing the content of the one or more fields of the packets with pattern information related to advertising content or advertising source.
Abstract translation: 提供了用于检测流氓无线信标设备的技术。 在多个接收机设备处接收来自信标设备的无线传输。 信标设备的无线传输包括携带用于移动无线设备的基于位置的服务的信息的分组。 获得由信标设备发送并由一个或多个接收机设备接收的分组的一个或多个字段的内容。 分析分组的一个或多个字段的内容以检测未经授权的信标设备。 分析操作可以包括将分组的一个或多个字段的内容与包含用于授权信标设备的一个或多个标识符的列表进行比较。 在另一种形式中，分析可以包括利用与广告内容或广告源相关联的模式信息来分析分组的一个或多个字段的内容。
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8.发明申请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与选择性信道尺寸减小/衰减和其他参数的高密度部署公开(公告)号：US20140098681A1
公开(公告)日：2014-04-10
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
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。
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公开(公告)号：US20130177110A1
公开(公告)日：2013-07-11
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。
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10.发明授权Independent and concurrent automatic gain control for wireless communication and spectral intelligence 有权用于无线通信和光谱智能的独立并发自动增益控制公开(公告)号：US09544041B2
公开(公告)日：2017-01-10
申请号：US13973496
申请日：2013-08-22
Applicant: Cisco Technology, Inc.
Inventor： Raghuram Rangarajan , David Kloper , Paul J. Stager
CPC classification number: H04B7/0817 , H03G3/3078
Abstract: A set of receiver path circuits is allocated for processing a radio-frequency (RF) signal provided by receive antennas coupled to the receiver path circuits. The RF signal may belong to a first signal class, such as Wi-Fi. A first gain control signal is applied to each of the allocated receiver path circuits to condition a signal level of the RF signal for the first signal class. A second gain control signal is applied to another set of receiver path circuits coupled to the receive antennas to condition the RF signal of a second signal class. First receive gain control signals are generated from the RF signals of the first signal class by the allocated set of the receiver path circuits. The first receive gain control signals are configured to optimize the signal level for processing the first signal class. A second receive gain control signal is generated to optimize the signal level of the RF signal for the second signal class.
Abstract translation: 分配一组接收机路径电路来处理由耦合到接收机路径电路的接收天线提供的射频（RF）信号。 RF信号可以属于第一信号类，例如Wi-Fi。 对每个分配的接收机路径电路施加第一增益控制信号，以便调节第一信号类的RF信号的信号电平。 第二增益控制信号被施加到耦合到接收天线的另一组接收器路径电路以调节第二信号类的RF信号。 第一接收增益控制信号由所分配的一组接收机路径电路从第一信号类的RF信号产生。 第一接收增益控制信号被配置为优化用于处理第一信号类的信号电平。 生成第二接收增益控制信号以优化第二信号类的RF信号的信号电平。
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