公开(公告)号：US07218604B2

公开(公告)日：2007-05-15

申请号：US10060502

申请日：2002-01-30

申请人： Srinath Hosur ,  Dennis Rauschmayer

发明人： Srinath Hosur ,  Dennis Rauschmayer

IPC分类号： H04J11/00

CPC分类号： H04L27/2602

摘要： A wireless transmitter (TX1). The transmitter comprises circuitry for providing a plurality of control (CONTROL) bits and circuitry for providing a plurality of user (USER) bits. The transmitter also comprises circuitry for modulating (16) the plurality of control bits and the plurality of user bits into a stream of complex symbols and circuitry (18) for converting the stream of complex symbols into a parallel plurality of complex symbol streams. The transmitter also comprises circuitry (20) for performing an inverse fast Fourier transform on the parallel plurality of complex symbol streams to form a parallel plurality of OFDM symbols and circuitry (22) for converting the parallel plurality of OFDM symbols into a serial stream of OFDM symbols. Each OFDM symbol in the serial stream of OFDM symbols comprises a plurality of data points, and selected (SF2.x) OFDM symbols in the serial stream of OFDM symbols carry modulation information (AMOD). The modulation information in one or more of the selected OFDM symbols comprises a plurality of modulation groups, and the plurality of modulation groups comprises a number of modulation parameters that describe modulation of a corresponding set of data points in a subsequent OFDM symbol in the serial stream of OFDM symbols.

摘要翻译： 无线发射机（TX <1> ）。 发射机包括用于提供多个控制（CONTROL）比特和用于提供多个用户（USER）比特）的电路的电路。 所述发射机还包括用于将所述多个控制比特和所述多个用户比特调制（16）为复数符号流和电路（18）的电路，用于将复符号流转换为并行多个复符号流。 发射机还包括用于对并行多个复符号流执行快速傅立叶逆变换的电路（20），以形成并行多个OFDM符号和电路（22），用于将并行多个OFDM符号转换成OFDM的串行流 符号。 OFDM符号的串行流中的每个OFDM符号包括多个数据点，并且在OFDM符号的串行流中选择的（SF×2.×N）个OFDM符号携带调制信息（AMOD）。 所选择的OFDM符号中的一个或多个中的调制信息包括多个调制组，并且所述多个调制组包括多个调制参数，所述调制参数描述在串行流中随后的OFDM符号中对应的一组数据点的调制 的OFDM符号。

公开(公告)号：US07324606B2

公开(公告)日：2008-01-29

申请号：US10001986

申请日：2001-10-31

申请人： Henry Stephen Eilts ,  Srinath Hosur ,  David Patrick Magee ,  Dennis Rauschmayer

发明人： Henry Stephen Eilts ,  Srinath Hosur ,  David Patrick Magee ,  Dennis Rauschmayer

IPC分类号： H03K9/00 ,  H04L27/00

CPC分类号： H04L25/0204 ,  H04L25/022 ,  H04L25/0232 ,  H04L27/2647

摘要： A system and method is provided for determining a channel estimate utilizing partial channel estimates to provide an aggregated channel estimate. A partial channel estimate is determined upon receipt of a data burst, such that a different subset of the channel estimate is updated every data burst. As a result, Fast Fourier Transform computations can be reduced by determining a portion of the channel estimate each data burst as opposed to determining a full channel estimate every data burst.

摘要翻译： 提供了一种用于使用部分信道估计来确定信道估计以提供聚合信道估计的系统和方法。 在接收到数据脉冲串时确定部分信道估计，使得每个数据突发更新信道估计的不同子集。 结果，通过确定每个数据脉冲串的信道估计的一部分，可以减少快速傅里叶变换计算，而不是确定每个数据脉冲串的全频道估计。

公开(公告)号：US09900193B2

公开(公告)日：2018-02-20

申请号：US13566639

申请日：2012-08-03

申请人： Timothy Mark Schmidl ,  Srinath Hosur ,  Anuj Batra

发明人： Timothy Mark Schmidl ,  Srinath Hosur ,  Anuj Batra

IPC分类号： H04L27/00 ,  H04L27/26

CPC分类号： H04L27/0012 ,  H04L27/2613

摘要： A method of communicating in a wireless network including a plurality of nodes having communications devices including a first node, wherein at least one node utilizes a first physical layer (PHY) modulation, and at least one other node utilizes a second PHY modulation different from the first PHY modulation. The first node receives a PHY frame transmitted by one of the plurality of nodes, and identifies a PHY modulation type selected from the first PHY modulation and the second PHY modulation used in the PHY frame or to be used in a subsequently to be received PHY frame or frame portion. The first node decodes the PHY frame or the subsequently to be received PHY frame or frame portion using the PHY modulation type identified in the identifying step.

公开(公告)号：US09240900B2

公开(公告)日：2016-01-19

申请号：US13226133

申请日：2011-09-06

申请人： Nirmal C. Warke ,  Brad Kramer ,  Hassan Ali ,  Swaminathan Sankaran ,  Baher Haroun ,  Srinath Hosur ,  Martin J. Izzard

发明人： Nirmal C. Warke ,  Brad Kramer ,  Hassan Ali ,  Swaminathan Sankaran ,  Baher Haroun ,  Srinath Hosur ,  Martin J. Izzard

IPC分类号： H04L12/50

CPC分类号： H04L12/50 ,  G06F13/4022 ,  Y02D10/14 ,  Y02D10/151

摘要： Conventional routers employ a wired backplane that employs “long reach” serializer/deserializer (SerDes) links, but this type of architecture is complicated, costly, and uses a considerable amount of power. To address some of these issues, a new wireless backplane architecture is provided here. This wireless backplane employs direct millimeter wave links between line cards that replaces the convention, wired switching fabric.

摘要翻译： 常规路由器采用采用“长距离”串行器/解串器（SerDes）链路的有线背板，但是这种类型的架构是复杂的，昂贵的并且使用相当大的功率。 为了解决其中的一些问题，这里提供了一种新的无线背板架构。 该无线背板在线路卡之间采用直接毫米波链接，取代了常规，有线交换结构。

公开(公告)号：US08380433B2

公开(公告)日：2013-02-19

申请号：US12568084

申请日：2009-09-28

申请人： June Chul Roh ,  Deric W. Waters ,  Srinath Hosur ,  Goutam Dutta

发明人： June Chul Roh ,  Deric W. Waters ,  Srinath Hosur ,  Goutam Dutta

IPC分类号： G01C21/10 ,  H04B7/185

CPC分类号： G01S19/47 ,  G01C21/165 ,  G01C21/28 ,  G01C22/006 ,  G06F17/16

摘要： Embodiments of the invention provide a blending filter based on extended Kalman filter (EKF), which optimally integrates the IMU navigation data with all other satellite measurements tightly-coupled integration filter. This blending filter can be easily implemented with minor modification to the position engine of stand-alone GNSS receiver. Provided is a low-complexity tightly-coupled integration filter for sensor-assisted global navigation satellite system (GNSS) receiver. The inertial measurement unit (IMU) contains inertial sensors such as accelerometer, magnetometer, and/or gyroscopes Embodiments also include method for pedestrian dead reckoning (PDR) data conversion for ease of GNSS/PDR integration. The PDR position data is converted to user velocity measured at the time instances where GNSS position/velocity estimates are available.

摘要翻译： 本发明的实施例提供了一种基于扩展卡尔曼滤波器（EKF）的混合滤波器，其将IMU导航数据与所有其他卫星测量紧密耦合的积分滤波器进行最佳集成。 这种混合滤波器可以通过对独立GNSS接收机的位置引擎的微小修改来轻松实现。 提供了用于传感器辅助的全球导航卫星系统（GNSS）接收机的低复杂度紧耦合集成滤波器。 惯性测量单元（IMU）包含诸如加速度计，磁力计和/或陀螺仪的惯性传感器。实施例还包括用于容易进行GNSS / PDR集成的行人航位推算（PDR）数据转换的方法。 PDR位置数据被转换成在GNSS位置/速度估计可用的时间点测量的用户速度。

公开(公告)号：US20120154184A1

公开(公告)日：2012-06-21

申请号：US13403223

申请日：2012-02-23

申请人： Anand G. Dabak ,  Sundararajan Srinun ,  Srinath Hosur

发明人： Anand G. Dabak ,  Sundararajan Srinun ,  Srinath Hosur

IPC分类号： H03M7/00

CPC分类号： H04B1/7083 ,  H04B1/70735 ,  H04J13/00 ,  H04J13/12

摘要： A wireless communication system. The system comprises transmitter circuitry (BST1), the transmitter circuitry comprising encoder circuitry (50) for transmitting a plurality of frames (FR). Each of the plurality of frames comprises a primary synchronization code (PCS) and a second synchronization code (SSC). The encoder circuitry comprises of circuitry (501) for providing the primary synchronization code in response to a first sequence (32). The encoder circuitry further comprises circuitry (502) for providing the secondary synchronization code in response to a second sequence (54) and a third sequence (56). The second sequence is selected from a plurality of sequences. Each of the plurality of sequences is orthogonal with respect to all other sequences. The third sequence is a subset of bits from the first sequence.

摘要翻译： 无线通信系统。 该系统包括发射机电路（BST1），该发射机电路包括用于传输多个帧（FR）的编码器电路（50）。 多个帧中的每一个包括主同步码（PCS）和第二同步码（SSC）。 编码器电路包括用于响应于第一序列（32）提供主同步码的电路（501）。 编码器电路还包括用于响应于第二序列（54）和第三序列（56）提供辅助同步码的电路（502）。 第二序列从多个序列中选择。 多个序列中的每一个相对于所有其他序列是正交的。 第三个序列是来自第一个序列的比特的子集。

公开(公告)号：US08054914B2

公开(公告)日：2011-11-08

申请号：US12022461

申请日：2008-01-30

申请人： Deric W. Waters ,  Anuj Batra ,  Srinath Hosur

发明人： Deric W. Waters ,  Anuj Batra ,  Srinath Hosur

IPC分类号： H03K9/00 ,  H04L27/00

CPC分类号： H04L27/2647 ,  H04L1/206

摘要： A method and system for estimating noise variance. A method for noise variance estimation comprises receiving a first multi-sample symbol and receiving a second multi-sample symbol. The first multi-sample symbol is subtracted from the second multi-sample symbol to produce a set of noise samples. The set of noise samples is used to produce a noise variance estimate. The noise variance estimate is applied in various tasks (e.g. channel estimation, log-likelihood ratio computation, and/or minimum mean squared error equalization) to process data provided to a user.

摘要翻译： 一种用于估计噪声方差的方法和系统。 一种用于噪声方差估计的方法包括接收第一多样本符号并接收第二多样本符号。 从第二多样本符号中减去第一多样本符号以产生一组噪声样本。 噪声样本集用于产生噪声方差估计。 在各种任务（例如信道估计，对数似然比计算和/或最小均方误差均衡）中应用噪声方差估计以处理提供给用户的数据。

公开(公告)号：US08040986B2

公开(公告)日：2011-10-18

申请号：US10723215

申请日：2003-11-26

申请人： Michael O. Polley ,  Donald P. Shaver ,  Srinath Hosur ,  Eko Onggosanusi ,  Muhammad Z. Ikram ,  Anand Dabak

发明人： Michael O. Polley ,  Donald P. Shaver ,  Srinath Hosur ,  Eko Onggosanusi ,  Muhammad Z. Ikram ,  Anand Dabak

IPC分类号： H04B7/10 ,  H04L1/02

CPC分类号： H04W52/42

摘要： A system comprises a wireless device that communicates across a spectrum having a plurality of sub-channels. The wireless device comprises a plurality of antennas through which the wireless device communicates with another wireless device, wherein each antenna communicates with the other wireless device via an associated communication pathway. The wireless device further comprises sub-channel power analysis logic coupled to the antennas and adapted to determine which communication pathway has the highest communication quality on a sub-channel by sub-channel basis. The wireless device still further comprises diversity selection logic coupled to the sub-channel power analysis logic and adapted to determine a weighting vector for an associated antenna based on the communication quality, wherein the weighting vector specifies a relative transmission power for each sub-channel for the associated antenna.

摘要翻译： 系统包括在具有多个子信道的频谱上进行通信的无线设备。 无线设备包括多个天线，无线设备通过该天线与另一无线设备通信，其中每个天线经由相关联的通信路径与另一无线设备通信。 无线设备还包括耦合到天线的子信道功率分析逻辑，并且适于通过子信道来确定子信道上哪个通信路径具有最高通信质量。 无线设备还包括耦合到子信道功率分析逻辑的分集选择逻辑，并且适于基于通信质量来确定相关天线的加权向量，其中加权向量规定每个子信道的相对发射功率，用于 相关天线。

公开(公告)号：US07957474B2

公开(公告)日：2011-06-07

申请号：US11618432

申请日：2006-12-29

申请人： Deric Wayne Waters ,  Srinath Hosur ,  Anuj Batra

发明人： Deric Wayne Waters ,  Srinath Hosur ,  Anuj Batra

IPC分类号： H04K1/10

CPC分类号： H04L27/0012 ,  H04L27/22 ,  H04L27/2647

摘要： Disclosed herein is a system and method for determining the presence of rotated-BPSK modulation. In addition, disclosed herein is a system and method for determining if a received packet is a Legacy, Mixed-Mode, or Green-Field packet in accordance with the determination of the presence of rotated-BPSK modulation. The presence of a Green-Field packet may be determined by detecting if additional tones are being excited in an LTF symbol of the received packet and/or if a SIG field symbol following the LTF symbol is modulated by rotated-BPSK. The presence of a Mixed-Mode packet may be determined by detecting if the first four bits of the SIG field symbol following the LTF symbol are [1 1 0 1] and/or detecting if a symbol following an L-SIG symbol is modulated by rotated-BPSK. The presence of a Legacy packet may be determined by detecting if the symbol following the L-SIG symbol is modulated by BPSK.

摘要翻译： 本文公开了一种用于确定旋转BPSK调制的存在的系统和方法。 此外，本文所公开的是根据确定旋转BPSK调制的确定来确定接收的分组是传统的，混合模式的还是绿色场分组的系统和方法。 可以通过检测在接收到的分组的LTF符号中是否激励附加音调和/或如果通过旋转BPSK调制LTF符号之后的SIG字段符号，则可以确定绿场分组的存在。 混合模式分组的存在可以通过检测LTF符号之后的SIG字段符号的前四位是否为[1×10 1]和/或检测在L-SIG符号之后的符号是否被 旋转BPSK。 可以通过检测L-SIG符号之后的符号是否被BPSK调制来确定遗留分组的存在。

公开(公告)号：US07864661B2

公开(公告)日：2011-01-04

申请号：US10755603

申请日：2004-01-12

申请人： Srinath Hosur ,  Srikanth Gummadi ,  Anuj Batra ,  David P. Magee

发明人： Srinath Hosur ,  Srikanth Gummadi ,  Anuj Batra ,  David P. Magee

IPC分类号： H04J11/00

CPC分类号： H04W88/08

摘要： The present invention is directed to a time-switched preamble generator and method of generating a time-switched preamble for use with a multiple-input, multiple-output (MIMO) transmitter employing first and second transmit antennas. In one embodiment, the time-switched preamble generator includes an initial preamble formatter configured to provide a first preamble to the first transmit antenna and a second preamble to the second transmit antenna during an initial time interval. The time-switched preamble generator also includes a subsequent preamble formatter coupled to the initial preamble formatter and configured to provide the second preamble to the first transmit antenna and the first preamble to the second transmit antenna during a subsequent time interval.

摘要翻译： 本发明涉及一种时间切换前导码生成器和用于与采用第一和第二发射天线的多输入多输出（MIMO）发射机一起使用的时间切换前同步码的方法。 在一个实施例中，时间切换前导码生成器包括初始前同步码格式器，其被配置为在初始时间间隔期间向第一发射天线提供第一前同步码和第二前导码到第二发射天线。 时间切换前导码生成器还包括后续前导码格式器，其耦合到初始前导码格式化器并且被配置为在随后的时间间隔期间向第一发射天线提供第二前同步码和第一前导码到第二发射天线。