公开(公告)号：US20120063340A1

公开(公告)日：2012-03-15

申请号：US13230512

申请日：2011-09-12

Applicant: Deric W. WATERS ,  Sthanunathan RAMAKRISHNAN ,  Ariton E. XHAFA ,  Jaiganesh BALAKRISHNAN ,  Tarkesh PANDE ,  Sandeep KASARGOD ,  Saket THUKRAL

Inventor： Deric W. WATERS ,  Sthanunathan RAMAKRISHNAN ,  Ariton E. XHAFA ,  Jaiganesh BALAKRISHNAN ,  Tarkesh PANDE ,  Sandeep KASARGOD ,  Saket THUKRAL

IPC: H04W24/00 ,  H04W84/12 ,  H04W88/08

CPC classification number: G01S5/0242 ,  H04W64/00

Abstract: Apparatus and methods for scanning for access points (APs) for wireless local area network (WLAN) positioning. In one embodiment a wireless device includes a WLAN positioning system. The WLAN positioning system includes an AP scanner. The AP scanner is configured to determine which WLAN channels are being used by APs proximate to the wireless device. The AP scanner is also configured to scan for AP transmissions only the WLAN channels determined to be used by APs proximate to the wireless device. The AP scanner is further configured to extract signal strength and AP identification information for WLAN positioning from the AP transmissions on the scanned channels.

Abstract translation: 用于扫描用于无线局域网（WLAN）定位的接入点（AP）的装置和方法。 在一个实施例中，无线设备包括WLAN定位系统。 WLAN定位系统包括AP扫描器。 AP扫描器被配置为确定靠近无线设备的AP正在使用哪些WLAN信道。 AP扫描器还被配置为仅扫描AP传输，确定由接近无线设备的AP使用的WLAN信道。 AP扫描器还被配置为从扫描的信道上的AP传输中提取用于WLAN定位的信号强度和AP识别信息。

公开(公告)号：US20080187061A1

公开(公告)日：2008-08-07

申请号：US12024064

申请日：2008-01-31

Applicant: Tarkesh PANDE ,  Srinath HOSUR ,  Anuj BATRA ,  Deric W. WATERS

Inventor： Tarkesh PANDE ,  Srinath HOSUR ,  Anuj BATRA ,  Deric W. WATERS

IPC: H04L27/28

CPC classification number: H04B7/043 ,  H04L25/0204 ,  H04L27/2626

Abstract: Embodiments provide a system and method for reconstructing steering matrices in a MIMO-OFDM (multiple-input multiple-output orthogonal frequency division multiplexing) system by interpolating steering matrices in transmit beamforming. The reconstructed steering matrices provide a faithful representation to the actual steering matrices. Embodiments receive channel information for a subset of sub-carriers of a channel, interpolate the channel information for the subset of sub-carriers to obtain at least one Givens rotation angle for remaining sub-carriers of the channel which are not members of the subset, and reconstruct missing steering matrices from the interpolated angles.

Abstract translation: 实施例提供了一种通过在发射波束形成中内插导引矩阵来重构MIMO-OFDM（多输入多输出正交频分复用）系统中的导向矩阵的系统和方法。 重建的导向矩阵为实际的导向矩阵提供忠实的表示。 实施例接收信道的子载波的子集的信道信息，内插用于子载波子集的信道信息，以获得不是子集的成员的信道的剩余子载波的至少一个Givens旋转角， 并从内插角度重建失踪导向矩阵。

公开(公告)号：US20110202754A1

公开(公告)日：2011-08-18

申请号：US13027796

申请日：2011-02-15

Applicant: Deric W. WATERS ,  Tarkesh PANDE

Inventor： Deric W. WATERS ,  Tarkesh PANDE

IPC: G06F9/00

CPC classification number: B63J99/00 ,  B63J2099/008 ,  G01C21/20 ,  G01C21/3423

Abstract: A navigation system determines its usage mode. In some embodiments, a method comprises determining a usage mode of a navigation system based on at least one of an acceleration indicator, a speed indicator, and a magnet sensor. The usage mode is at least one of a pedestrian mode, a vehicular mode, an aerial mode, a train mode, and a marine mode. The method further comprises configuring a navigation subsystem based on the usage mode.

Abstract translation: 导航系统确定其使用模式。 在一些实施例中，一种方法包括基于加速度指示器，速度指示器和磁体传感器中的至少一个来确定导航系统的使用模式。 使用模式是行人模式，车辆模式，空中模式，列车模式和船用模式中的至少一种。 该方法还包括基于使用模式配置导航子系统。

公开(公告)号：US20120158296A1

公开(公告)日：2012-06-21

申请号：US13023987

申请日：2011-02-09

Applicant: Deric W. WATERS ,  Tarkesh PANDE

Inventor： Deric W. WATERS ,  Tarkesh PANDE

IPC: G01C21/12

CPC classification number: G01C21/16 ,  G01C19/04 ,  Y10T74/1229

Abstract: A system comprises a gyroscope configured to produce a gyroscope signal, an accelerometer configured to produce an accelerometer signal, and a filter unit coupled to the gyroscope and having a configurable bandwidth. The filter unit configured to filter the gyroscope signal. The system also comprises control logic that is configured to alter the bandwidth of the filter unit based on the accelerometer signal.

Abstract translation: 一种系统包括被配置为产生陀螺仪信号的陀螺仪，被配置为产生加速度计信号的加速度计和耦合到陀螺仪并具有可配置带宽的滤波器单元。 滤波器单元被配置为滤波陀螺仪信号。 该系统还包括控制逻辑，其被配置为基于加速度计信号来改变滤波器单元的带宽。

公开(公告)号：US20080187032A1

公开(公告)日：2008-08-07

申请号：US12024029

申请日：2008-01-31

Applicant: Tarkesh PANDE ,  Deric W. WATERS ,  Srinath HOSUR ,  Anuj BATRA

Inventor： Tarkesh PANDE ,  Deric W. WATERS ,  Srinath HOSUR ,  Anuj BATRA

IPC: H04B17/00 ,  H04B3/46 ,  H04Q1/20

CPC classification number: H04L25/0204 ,  H04B7/0417 ,  H04B7/066 ,  H04L2025/03426

Abstract: Embodiments provide a system and method for efficiently classifying different channel types in an orthogonal frequency division multiplexing (OFDM) system. Embodiments quantify the frequency selectivity in a channel by measuring the variation in a particular channel statistic across sub-carriers in an OFDM system, involve minimal complexity in implementation, and can be used in a variety of scenarios. One embodiment is a method for classifying channels in an OFDM system, comprising measuring variation of at least one channel statistic across sub-carriers, quantifying the variation to determine a measurement value, and applying the measurement value to at least one threshold to classify the channel.

Abstract translation: 实施例提供了一种用于在正交频分复用（OFDM）系统中有效地分类不同信道类型的系统和方法。 实施例通过测量OFDM系统中跨子载波的​​特定信道统计量的变化来量化信道中的频率选择性，涉及实现中的最小复杂度，并且可以用于各种情况。 一个实施例是一种用于对OFDM系统中的信道进行分类的方法，包括测量跨越子载波的至少一个信道统计量的变化，量化变化以确定测量值，以及将测量值应用于至少一个阈值以对信道进行分类 。

公开(公告)号：US20120172054A1

公开(公告)日：2012-07-05

申请号：US13327052

申请日：2011-12-15

Applicant: Deric W. WATERS ,  Tarkesh PANDE ,  Jaiganesh BALAKRISHNAN

Inventor： Deric W. WATERS ,  Tarkesh PANDE ,  Jaiganesh BALAKRISHNAN

IPC: H04W24/00

CPC classification number: G01S19/46 ,  H04W64/00

Abstract: Apparatus and method for cooperatively positioning a mobile wireless device. In one embodiment a mobile wireless device includes a navigation satellite receiver, a WLAN transceiver, and a cooperative positioning system. The navigation satellite receiver is configured to receive positioning signals from positioning satellites. The cooperative positioning system is configured to receive positioning measurements from a cooperating mobile wireless device via the WLAN transceiver. The received positioning measurements are derived from satellite positioning signals received by the cooperating mobile wireless device. The cooperative positioning system is also configured to determine a position of the mobile wireless device based on the positioning measurements received from the cooperating mobile wireless device, positioning measurements provided by the navigation satellite receiver, and a focal measurement that is a function of at least one of the position and the clock bias of both the mobile wireless device and the cooperating mobile wireless device.

Abstract translation: 用于协调地定位移动无线设备的装置和方法。 在一个实施例中，移动无线设备包括导航卫星接收机，WLAN收发器和协作定位系统。 导航卫星接收机被配置为从定位卫星接收定位信号。 协作定位系统被配置为经由WLAN收发器从协作的移动无线设备接收定位测量。 所接收的定位测量值来源于由协作的移动无线设备接收的卫星定位信号。 协作定位系统还被配置为基于从协作的移动无线设备接收的定位测量结果确定移动无线设备的位置，由导航卫星接收机提供的定位测量以及作为至少一个 移动无线设备和协作移动无线设备的位置和时钟偏差。

公开(公告)号：US20120106609A1

公开(公告)日：2012-05-03

申请号：US13284745

申请日：2011-10-28

Applicant: Taejoon KIM ,  Timothy M. SCHMIDL ,  Tarkesh PANDE ,  Anuj BATRA ,  June Chul ROH

Inventor： Taejoon KIM ,  Timothy M. SCHMIDL ,  Tarkesh PANDE ,  Anuj BATRA ,  June Chul ROH

IPC: H03D1/04 ,  H04B17/00 ,  H04L27/06

CPC classification number: H04L25/0212 ,  H04L25/0216 ,  H04L25/0222 ,  H04L27/2601

Abstract: A system and method for classifying a channel with regard to delay spread in a wireless network applying orthogonal frequency division multiplexing. In one embodiment, a wireless receiver includes a channel classifier. The channel classifier is configured to compute a channel estimate corresponding to a channel traversed by a packet received by the wireless receiver. The channel classifier is also configured to partition the channel estimate into a plurality of windows. Each window corresponds to a range of time of the channel estimate. The channel classifier is further configured to assign a delay spread classification to the channel based on a distribution of energy across the windows.

Abstract translation: 一种用于对采用正交频分复用的无线网络中的延迟扩展对信道进行分类的系统和方法。 在一个实施例中，无线接收机包括信道分类器。 信道分类器被配置为计算与由无线接收机接收的分组所经过的信道相对应的信道估计。 信道分类器还被配置为将信道估计分割成多个窗口。 每个窗口对应于信道估计的时间范围。 信道分类器还被配置为基于跨越窗口的能量分布向信道分配延迟扩展分类。

公开(公告)号：US20130070781A1

公开(公告)日：2013-03-21

申请号：US13609885

申请日：2012-09-11

Applicant: Ramanuja VEDANTHAM ,  Kumaran VIJAYASANKAR ,  Tarkesh PANDE ,  Anand DABAK

Inventor： Ramanuja VEDANTHAM ,  Kumaran VIJAYASANKAR ,  Tarkesh PANDE ,  Anand DABAK

IPC: H04L12/413

CPC classification number: H04L12/413

Abstract: Method and apparatus for communicating via a network. In one embodiment, a device for communicating via a network includes a medium access controller (MAC). The MAC is configured to apply a contention window for collision avoidance on the network, and to determine whether the network is free for use on expiration of a time value of the contention window. The MAC is also configured to initiate a transmission based on a determination that the network is free for use. The MAC is further configured to increase, in accordance with a predetermined probability value, the time value of the contention window based on: the transmission being successful; and the time value of the contention window being a minimum contention window time value. The probability value establishes the likelihood of the MAC increasing the time value of the contention window with respect to successful transmissions with the minimum contention window time value.

Abstract translation: 用于通过网络进行通信的方法和装置。 在一个实施例中，用于经由网络进行通信的设备包括介质访问控制器（MAC）。 MAC被配置为在网络上应用冲突避免的争用窗口，并且确定在竞争窗口的时间值到期时网络是否可用。 MAC还被配置为基于确定网络是免费的使用来发起传输。 MAC还被配置为基于：传输成功地根据预定概率值增加争用窗口的时间值; 并且争用窗口的时间值是最小竞争窗口时间值。 概率值建立MAC以相对于成功传输的最小竞争窗口时间值来增加竞争窗口的时间值的可能性。