公开(公告)号：US20110096739A1

公开(公告)日：2011-04-28

申请号：US12913200

申请日：2010-10-27

申请人： Sam Heidari ,  Kapil Gulati ,  Ali Rouhi ,  Ravi Narasimhan ,  Rajkumar Samuel

发明人： Sam Heidari ,  Kapil Gulati ,  Ali Rouhi ,  Ravi Narasimhan ,  Rajkumar Samuel

IPC分类号： H04W72/04

CPC分类号： H04W72/085 ,  H04W36/06 ,  H04W48/16

摘要： A method and apparatus to select the best channel of a wireless network for data communication at any given time, during normal operation of the network, is described. The network may be an IEEE standard 802.11 compliant network. Channel scanning may be performed in any station on the wireless network, such as an access point (AP) or a mobile station, or both. Channel scanning may be performed during data communication idle time, or simultaneously with data communication on the network. The technique can be implemented in a multiple-input multiple-output (MIMO) communication system, where the antenna or antennas used for channel scanning can be selected dynamically during operation, to optimize one or more performance characteristics.

摘要翻译： 描述了在网络的正常操作期间在任何给定时间选择用于数据通信的无线网络的最佳信道的方法和装置。 网络可以是IEEE标准的802.11兼容网络。 频道扫描可以在诸如接入点（AP）或移动台之类的无线网络上的任何站中执行，或者两者。 信道扫描可以在数据通信空闲时间期间执行，或者与网络上的数据通信同时进行。 该技术可以在多输入多输出（MIMO）通信系统中实现，其中可以在操作期间动态地选择用于信道扫描的天线或天线，以优化一个或多个性能特征。

公开(公告)号：US08432826B2

公开(公告)日：2013-04-30

申请号：US12913200

申请日：2010-10-27

申请人： Sam Heidari ,  Kapil Gulati ,  Ali Rouhi ,  Ravi Narasimhan ,  Rajkumar Samuel

发明人： Sam Heidari ,  Kapil Gulati ,  Ali Rouhi ,  Ravi Narasimhan ,  Rajkumar Samuel

IPC分类号： H04L12/28 ,  H04W4/00 ,  H04W72/00 ,  H04B7/212

CPC分类号： H04W72/085 ,  H04W36/06 ,  H04W48/16

摘要： A method and apparatus to select the best channel of a wireless network for data communication at any given time, during normal operation of the network, is described. The network may be an IEEE standard 802.11 compliant network. Channel scanning may be performed in any station on the wireless network, such as an access point (AP) or a mobile station, or both. Channel scanning may be performed during data communication idle time, or simultaneously with data communication on the network. The technique can be implemented in a multiple-input multiple-output (MIMO) communication system, where the antenna or antennas used for channel scanning can be selected dynamically during operation, to optimize one or more performance characteristics.

摘要翻译： 描述了在网络的正常操作期间在任何给定时间选择用于数据通信的无线网络的最佳信道的方法和装置。 网络可以是IEEE标准的802.11兼容网络。 频道扫描可以在诸如接入点（AP）或移动台之类的无线网络上的任何站中执行，或者两者。 信道扫描可以在数据通信空闲时间期间执行，或者与网络上的数据通信同时进行。 该技术可以在多输入多输出（MIMO）通信系统中实现，其中可以在操作期间动态地选择用于信道扫描的天线或天线，以优化一个或多个性能特征。

公开(公告)号：US08223802B2

公开(公告)日：2012-07-17

申请号：US12800309

申请日：2010-05-11

申请人： Amir Hadi Djahanshahi ,  Ravi Narasimhan ,  Jim Wood ,  Farrokh Farrokhi ,  Sam Heidari ,  Vahbod Pourahmad ,  Jihoon Yoon

发明人： Amir Hadi Djahanshahi ,  Ravi Narasimhan ,  Jim Wood ,  Farrokh Farrokhi ,  Sam Heidari ,  Vahbod Pourahmad ,  Jihoon Yoon

IPC分类号： H04J1/02

CPC分类号： G01S7/021 ,  H04L1/0071 ,  H04W16/14

摘要： A low complexity primary user detection system is disclosed. Signals are filtered to reduce the number of signals that must be processed. Width and PRI of the signals are used to match a constellation associated with a primary user. If the constellation is matched, communication parameters are adjusted to make way for the primary user.

摘要翻译： 公开了一种低复杂度的主用户检测系统。 信号被过滤以减少必须处理的信号数量。 信号的宽度和PRI用于匹配与主用户相关联的星座。 如果星座匹配，则调整通信参数以使主用户方便。

公开(公告)号：US08634434B2

公开(公告)日：2014-01-21

申请号：US12939023

申请日：2010-11-03

申请人： Sam Heidari ,  Sigurd Schelstraete ,  Ravi Narasimhan ,  Andrea Goldsmith

发明人： Sam Heidari ,  Sigurd Schelstraete ,  Ravi Narasimhan ,  Andrea Goldsmith

IPC分类号： H04L12/43

CPC分类号： H04W40/06

摘要： Disclosed are methods and apparatuses related to the routing of communications in a wireless mesh network so as to provide improved range, reliability and/or throughput. At least some aspects of the techniques and apparatuses can be implemented in an intermediary node (relay node) on a wireless mesh network. The relay node and other devices on the wireless network may implement a form of multiple-input multiple-output (MIMO) communication, such as multi-user MIMO (MU-MIMO). The devices on the network can communicate in accordance with IEEE standard 802.11.

摘要翻译： 公开了与无线网状网络中的通信路由相关的方法和装置，以便提供改进的范围，可靠性和/或吞吐量。 技术和装置的至少一些方面可以在无线网状网络上的中间节点（中继节点）中实现。 中继节点和无线网络上的其他设备可以实现诸如多用户MIMO（MU-MIMO）的多输入多输出（MIMO）通信的形式。 网络上的设备可以根据IEEE标准802.11进行通信。

公开(公告)号：US20110110345A1

公开(公告)日：2011-05-12

申请号：US12939023

申请日：2010-11-03

申请人： Sam Heidari ,  Sigurd Schelstraete ,  Ravi Narasimhan ,  Andrea Goldsmith

发明人： Sam Heidari ,  Sigurd Schelstraete ,  Ravi Narasimhan ,  Andrea Goldsmith

IPC分类号： H04W40/00

CPC分类号： H04W40/06

摘要： Disclosed are methods and apparatuses related to the routing of communications in a wireless mesh network so as to provide improved range, reliability and/or throughput. At least some aspects of the techniques and apparatuses can be implemented in an intermediary node (relay node) on a wireless mesh network. The relay node and other devices on the wireless network may implement a form of multiple-input multiple-output (MIMO) communication, such as multi-user MIMO (MU-MIMO). The devices on the network can communicate in accordance with IEEE standard 802.11.

摘要翻译： 公开了与无线网状网络中的通信路由相关的方法和装置，以便提供改进的范围，可靠性和/或吞吐量。 技术和装置的至少一些方面可以在无线网状网络上的中间节点（中继节点）中实现。 中继节点和无线网络上的其他设备可以实现诸如多用户MIMO（MU-MIMO）的多输入多输出（MIMO）通信的形式。 网络上的设备可以根据IEEE标准802.11进行通信。

公开(公告)号：US20110058535A1

公开(公告)日：2011-03-10

申请号：US12800309

申请日：2010-05-11

申请人： Amir Hadi Djahanshahi ,  Ravi Narasimhan ,  Jim Wood ,  Farrokh Farrokhi ,  Sam Heidari ,  Vahbod Pourahmad ,  Jihoon Yoon

发明人： Amir Hadi Djahanshahi ,  Ravi Narasimhan ,  Jim Wood ,  Farrokh Farrokhi ,  Sam Heidari ,  Vahbod Pourahmad ,  Jihoon Yoon

IPC分类号： H04W40/00

CPC分类号： G01S7/021 ,  H04L1/0071 ,  H04W16/14

摘要： A low complexity primary user detection system is disclosed. Signals are filtered to reduce the number of signals that must be processed. Width and PRI of the signals are used to match a constellation associated with a primary user. If the constellation is matched, communication parameters are adjusted to make way for the primary user.

摘要翻译： 公开了一种低复杂度的主用户检测系统。 信号被过滤以减少必须处理的信号数量。 信号的宽度和PRI用于匹配与主用户相关联的星座。 如果星座匹配，则调整通信参数以使主用户方便。

公开(公告)号：US09820696B1

公开(公告)日：2017-11-21

申请号：US14517559

申请日：2014-10-17

申请人： Ravi Narasimhan

发明人： Ravi Narasimhan

IPC分类号： A61B5/02 ,  A61B5/00 ,  A61B5/021 ,  A61B7/04

CPC分类号： A61B5/6898 ,  A61B5/0077 ,  A61B5/02125 ,  A61B5/7214 ,  A61B5/7278 ,  A61B7/00 ,  A61B7/045 ,  A61B2576/00

摘要： A method and system for determining blood pressure are disclosed. The method comprises determining a plurality of heart sounds using a microphone of a handheld device and determining a pulse wave using a camera of the handheld device, wherein the plurality of heart sounds and the pulse wave are utilized to determine the blood pressure. The system includes a processor, a memory device coupled to the processor, and an application coupled to the memory device. The system further comprises a microphone coupled to the processor, wherein the microphone is utilized to determine a plurality of heart sounds and a camera coupled to the processor, wherein the camera is utilized to determine a pulse wave, further wherein the application, when executed by the processor, causes the processor to determine the blood pressure using the plurality of heart sounds and the pulse wave.

公开(公告)号：US08897118B1

公开(公告)日：2014-11-25

申请号：US13023641

申请日：2011-02-09

申请人： Shi Cheng ,  Ravi Narasimhan

发明人： Shi Cheng ,  Ravi Narasimhan

IPC分类号： H04J11/00

CPC分类号： H04W56/0035

摘要： A method is provided for Single Carrier-Frequency-Division Multiple Access (SC-FDMA) Physical Uplink Control Channel (PUCCH) format 1/1a/1b detection in a wireless communications receiver. The receiver accepts a plurality of multicarrier signals transmitted simultaneously from a plurality of transmitters, with overlapping carrier frequencies. For each multicarrier signal, a single tap measurement of time delay is performed using a Direction of Arrival (DoA) technique. In response to the single tap measurements, PUCCH 1/1a/1b format signals are detected. Prior to performing the single tap measurements, the multicarrier signals are decorrelated in the time domain, using corresponding orthogonal code covers. Subsequent to the single tap measurements, each multicarrier signal is decorrelated in the frequency domain, using a corresponding cyclic shift. Subsequent to decorrelating the multicarrier signals in the frequency domain, a Generalized Likelihood Ratio Test (GLRT) is performed for each decorrelated multicarrier signal.

摘要翻译： 在无线通信接收机中提供用于单载波 - 频分多址（SC-FDMA）物理上行链路控制信道（PUCCH）格式1 / 1a / 1b检测的方法。 接收机接受多个发射机同时发射的多载波信号，具有重叠的载波频率。 对于每个多载波信号，使用到达方向（DoA）技术来执行时间延迟的单次测量。 响应于单抽头测量，检测PUCCH 1 / 1a / 1b格式信号。 在执行单抽头测量之前，多载波信号在时域中被解相关，使用对应的正交码覆盖。 在单抽头测量之后，使用相应的循环移位，在频域中将每个多载波信号解相关。 在对频域中的多载波信号进行去相关之后，对每个去相关的多载波信号执行广义似然比测试（GLRT）。

公开(公告)号：US07701975B1

公开(公告)日：2010-04-20

申请号：US10832711

申请日：2004-04-26

申请人： Hsiao-Cheng Tsang ,  Ravi Narasimhan ,  Hemanth Sampath

发明人： Hsiao-Cheng Tsang ,  Ravi Narasimhan ,  Hemanth Sampath

IPC分类号： H04L12/56 ,  H04J1/16

CPC分类号： H04L1/0079 ,  H04L1/0083 ,  H04L1/1607

摘要： A physical layer (PHY) packet aggregation technique may be used to reduce the percentage of PHY overhead in data transmission in order to achieve better PHY efficiency and higher throughput. Higher layer packets in an upper layer data queue may be fragmented into appropriate small-size sub-packets, which include a body encapsulated by a MAC header and an FCS field. The sub-packets are then concatenated to form the data field of an aggregated PHY packet. Since each of the sub-packets contains its own MAC (Media Access Control) header and FCS (Frame Check Sequence) field, the receiver can identify and flag erroneous sub-packets on an individual basis. The receiver may transmit a block ACK, which includes the acknowledgement status for each of the sub-packets in the aggregated PHY packet, to the transmitter. The transmitter may resend only the erroneous sub-packet(s).

摘要翻译： 可以使用物理层（PHY）分组聚合技术来减少数据传输中PHY开销的百分比，以便实现更好的PHY效率和更高的吞吐量。 上层数据队列中的较高层分组可能被分段成适当的小尺寸子分组，其包括由MAC头部和FCS字段封装的主体。 然后，子分组被级联以形成聚合的PHY分组的数据字段。 由于每个子分组包含其自身的MAC（媒体访问控制）报头和FCS（帧校验序列）字段，所以接收机可以单独地识别和标记错误的子分组。 接收机可以向发射机发送包括聚合PHY分组中的每个子分组的确认状态的块ACK。 发射机可以仅重新发送错误的子分组。

公开(公告)号：US07643405B1

公开(公告)日：2010-01-05

申请号：US12287199

申请日：2008-10-07

申请人： Ravi Narasimhan

发明人： Ravi Narasimhan

IPC分类号： H04J11/00

CPC分类号： H04L27/3863 ,  H04L25/022 ,  H04L25/0228 ,  H04L25/023 ,  H04L27/2665 ,  H04L27/2695

摘要： A signal processor includes an in-phase and quadrature (I/Q) detection module that generates I/Q components based on baseband signals. An analog to digital converter converts the I/Q components to digital I/Q components. An I/Q imbalance compensation module generates compensated I/Q components based on the digital I/Q components and maximum likelihood estimates of gain imbalance and phase imbalance. A frequency converting module converts the compensated I/Q components to first subcarrier signals. A channel estimating module generates initial channel estimates based on second subcarrier signals. The second subcarrier signals are based on the first subcarrier signals. A phase error and I/Q imbalance module generates the maximum likelihood estimates of the gain imbalance and the phase imbalance based on the initial channel estimates and the second subcarrier signals.

摘要翻译： 信号处理器包括基于基带信号产生I / Q分量的同相和正交（I / Q）检测模块。 模数转换器将I / Q组件转换为数字I / Q组件。 I / Q不平衡补偿模块基于数字I / Q分量和增益不平衡和相位不平衡的最大似然估计产生补偿I / Q分量。 频率转换模块将补偿的I / Q分量转换为第一副载波信号。 信道估计模块基于第二子载波信号产生初始信道估计。 第二副载波信号基于第一子载波信号。 相位误差和I / Q不平衡模块基于初始信道估计和第二子载波信号产生增益不平衡和相位不平衡的最大似然估计。