公开(公告)号：US07231184B2

公开(公告)日：2007-06-12

申请号：US10730242

申请日：2003-12-05

申请人： Henry S. Eilts ,  Srinath Hosur ,  David P. Magee

发明人： Henry S. Eilts ,  Srinath Hosur ,  David P. Magee

IPC分类号： H04B17/00

CPC分类号： H04L25/0202

摘要： A transmit channel (gt1, h, gr2) through which a first wireless communication transceiver is to transmit to a second wireless communication transceiver can be estimated using information indicative of a relationship between the transmit channel and a receive channel (gt2, h, gr1) through which the first wireless communication transceiver receives communications from the second wireless communication transceiver. The relationship information (35) is combined (37) with further information (31) to produce an estimate of the transmit channel.

摘要翻译： 可以使用表示第一无线通信收发器的信息的信息来估计第一无线通信收发器要向第二无线通信收发器发送的发送信道（g t1，h，g t2，h，g ）。 关系信息（35）与另外的信息（31）组合（37）以产生发送信道的估计。

公开(公告)号：US07333788B2

公开(公告)日：2008-02-19

申请号：US10735380

申请日：2003-12-12

申请人： Henry S. Eilts ,  Srinath Hosur

发明人： Henry S. Eilts ,  Srinath Hosur

IPC分类号： H04B17/02 ,  H04B1/06

CPC分类号： H04W52/52

摘要： Disclosed herein is an iterative process for calibrating an AGC in a wireless system, wherein the iterative process includes transmitting a calibration signal, receiving the calibration signal, decoding the calibration signal to produce a measurement, storing the measurement and changing an AGC gain setting.

摘要翻译： 这里公开了一种用于校准无线系统中的AGC的迭代过程，其中迭代过程包括发送校准信号，接收校准信号，解码校准信号以产生测量值，存储测量值并改变AGC增益设置。

公开(公告)号：US07957713B2

公开(公告)日：2011-06-07

申请号：US11962389

申请日：2007-12-21

申请人： Henry S. Eilts ,  Srinath Hosur

发明人： Henry S. Eilts ,  Srinath Hosur

IPC分类号： H04B17/02

CPC分类号： H04W52/52

摘要： Disclosed herein is an iterative process for calibrating an AGC in a wireless system, wherein the iterative process comprises transmitting a calibration signal, receiving the calibration signal, decoding the calibration signal to produce a measurement, storing the measurement and changing an AGC gain setting.

摘要翻译： 这里公开了一种用于校准无线系统中的AGC的迭代过程，其中迭代过程包括发送校准信号，接收校准信号，解码校准信号以产生测量，存储测量并改变AGC增益设置。

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。

公开(公告)号：US07184499B2

公开(公告)日：2007-02-27

申请号：US10438242

申请日：2003-05-14

申请人： David P. Magee ,  Srinath Hosur ,  Manish Goel

发明人： David P. Magee ,  Srinath Hosur ,  Manish Goel

IPC分类号： H03D1/04

CPC分类号： H04L27/2662 ,  H04L27/2675

摘要： A method of determining CPS data in an OFDM-based, wireless communication system resolves the phase angle difference between training tones in a burst without CPS data and training tones in a burst with CPS data and then demodulates the resulting difference phase angles to determine the CPS data. The method achieves timing correction/compensation in CPS decode operations associated with OFDM-based, wireless communication systems.

摘要翻译： 一种在基于OFDM的无线通信系统中确定CPS数据的方法，用CPS数据解析突发中没有CPS数据和训练音调的脉冲串中的训练音之间的相位角差，然后解调得到的差相位角以确定CPS 数据。 该方法在与基于OFDM的无线通信系统相关联的CPS解码操作中实现定时校正/补偿。

公开(公告)号：US07382832B2

公开(公告)日：2008-06-03

申请号：US10903668

申请日：2004-07-30

申请人： David P. Magee ,  Srinath Hosur ,  Michael O. Polley ,  Srikanth Gummadi

发明人： David P. Magee ,  Srinath Hosur ,  Michael O. Polley ,  Srikanth Gummadi

IPC分类号： H04B7/02 ,  H04L1/02

CPC分类号： H04B7/04 ,  H04B7/0669 ,  H04B7/0671

摘要： The present invention provides a time-switched preamble supplement generator for use with a multiple-input, multiple-output (MIMO) transmitter employing N transmit antennas wherein N is at least two. In one embodiment, the time-switched preamble supplement generator includes an initial preamble supplement formatter configured to provide a first permutation of a set of preamble supplements to the N transmit antennas during an initial time interval. The first permutation includes a single first preamble supplement and at least one second preamble supplement. The time-switched preamble supplement generator also includes a subsequent preamble supplement formatter coupled to the initial preamble supplement formatter and configured to provide (N−1) mutually exclusive further permutations of the set to the N transmit antennas during (N−1) subsequent time intervals.

摘要翻译： 本发明提供了一种与使用N个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导码补充生成器，其中N是至少两个。 在一个实施例中，时间切换前导码补充生成器包括初始前导码补充格式化器，被配置为在初始时间间隔期间向N个发射天线提供一组前导码补充的第一置换。 第一排列包括单个第一前序补码和至少一个第二前序补码。 所述时间切换前导码补充生成器还包括后续前导码补充格式化器，其耦合到所述初始前导码补充格式器，并且被配置为在（N-1）个后续时间期间向所述N个发射天线提供所述集合的（N-1）个互斥另外的排列 间隔

公开(公告)号：US07187734B2

公开(公告)日：2007-03-06

申请号：US10438243

申请日：2003-05-14

申请人： David P. Magee ,  Srinath Hosur ,  Manish Goel

发明人： David P. Magee ,  Srinath Hosur ,  Manish Goel

IPC分类号： H03D1/04 ,  H04J1/00

CPC分类号： H04L27/2662 ,  H04L27/261 ,  H04L27/2659 ,  H04L27/2675

摘要： A method of correctly estimating the frequency offset when the CPE modem has already acquired and is tracking the OFDM burst boundaries in an OFDM-based, wireless communication system. CPS data in an OFDM-based, wireless communication system is modulated as QPSK data in the training tones of the data burst. As long as some bursts have the CPS data modulation and some bursts do not have the CPS data modulation, the CPS data can be recovered. A slip results when there is a linear phase difference across the tones (after the FFT) between the current and the previous burst. This linear phase difference is generally taken care of by the channel estimation obtained using the pilot tones. This phase difference is however, now compensated for correct frequency offset estimation which occurs before the channel estimation and CPS decoding steps.

摘要翻译： 一种在CPE调制解调器已经获取并正在跟踪基于OFDM的无线通信系统中的OFDM突发边界时正确估计频率偏移的方法。 基于OFDM的无线通信系统中的CPS数据被调制为数据突发的训练音调中的QPSK数据。 只要某些突发具有CPS数据调制，并且一些突发没有CPS数据调制，则可以恢复CPS数据。 当当前和前一个脉冲串之间的音调（在FFT之后）存在线性相位差时，会产生滑动。 这种线性相位差通常由使用导频音获得的信道估计来处理。 然而，该相位差现在被补偿在信道估计和CPS解码步骤之前发生的正确的频率偏移估计。

公开(公告)号：US07324602B2

公开(公告)日：2008-01-29

申请号：US10886480

申请日：2004-07-07

申请人： David P. Magee ,  Srinath Hosur

发明人： David P. Magee ,  Srinath Hosur

IPC分类号： H04L1/02

CPC分类号： H04B7/0413 ,  H04B7/10 ,  H04L25/0204 ,  H04L25/0226 ,  H04L27/2613

摘要： The present invention provides a time-orthogonal preamble supplement generator for use with a multiple-input, multiple-output (MIMO) transmitter employing N transmit antennas, where N is at least two. In one embodiment, the time-orthogonal preamble supplement generator includes an initial preamble supplement encoder configured to provide a preamble supplement to each of the N transmit antennas during an initial time interval. The time-orthogonal preamble supplement generator also includes a subsequent preamble supplement encoder coupled to the initial preamble supplement encoder and configured to provide the preamble supplement or a negation thereof to the N transmit antennas during (N−1) subsequent time intervals.

摘要翻译： 本发明提供了一种与采用N个发射天线的多输入多输出（MIMO）发射机一起使用的时间正交前导码补充生成器，其中N是至少两个。 在一个实施例中，时间正交前导码补充生成器包括初始前导码补充编码器，其被配置为在初始时间间隔期间向N个发射天线中的每一个提供前导码补充。 时间正交前导码补充生成器还包括耦合到初始前导码补充编码器并被配置为在（N-1）个后续时间间隔期间向N个发送天线提供前导补充或否定的后续前导码补充编码器。

公开(公告)号：US06917311B2

公开(公告)日：2005-07-12

申请号：US10639418

申请日：2003-08-11

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

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

IPC分类号： H03M7/00 ,  H04B7/04 ,  H04L1/00 ,  H04L1/06 ,  H04L25/02 ,  H04L27/26

CPC分类号： H04L1/0078 ,  H04B7/04 ,  H04L1/06 ,  H04L25/0204 ,  H04L25/022 ,  H04L25/0226 ,  H04L27/2613

摘要： For use with a multiple-input, multiple-output (MIMO) transmitter, an orthogonal preamble encoder, a method of encoding orthogonal preambles and a communication system incorporating the encoder or the method. In one embodiment, the encoder includes: (1) a preamble supplement generator configured to provide a first long sequence preamble supplement to a first transmit antenna of the MIMO transmitter and (2) a preamble supplement coordinator coupled to the preamble supplement generator and configured to provide a second long sequence preamble supplement to a second transmit antenna of the MIMO transmitter, at least a portion of the second long sequence preamble supplement being a negation of the first long sequence preamble supplement.

摘要翻译： 用于多输入多输出（MIMO）发射机，正交前导码编码器，对正交前导码进行编码的方法和结合编码器的通信系统或方法。 在一个实施例中，所述编码器包括：（1）前导码补充生成器，被配置为向所述MIMO发射机的第一发射天线提供第一长序列前导码补充，以及（2）前缀补充协调器，其耦合到所述前导码补充生成器， 向所述MIMO发射机的第二发射天线提供第二长序列前导码补充，所述第二长序列前同步码补码的至少一部分是所述第一长序列前同步码补码的否定。

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.