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。

公开(公告)号：US20090279634A1

公开(公告)日：2009-11-12

申请号：US12470241

申请日：2009-05-21

申请人： Anand Ganesh Dabak ,  Timothy M. Schmidl ,  Srinath Hosur

发明人： Anand Ganesh Dabak ,  Timothy M. Schmidl ,  Srinath Hosur

IPC分类号： H04B7/02

CPC分类号： H04L1/06

摘要： A circuit is designed with a measurement circuit (746) coupled to receive an input signal from at least one of a first antenna and a second antenna of a transmitter. The measurement circuit produces an output signal corresponding to a magnitude of the input signal. A control circuit (726) is coupled to receive the output signal, a first reference signal (.eta..sub.1) and a second reference signal (.eta..sub.2). The control circuit is arranged to produce a control signal in response to a comparison of the output signal, the first reference signal and the second reference signal.

摘要翻译： 电路设计有测量电路（746），耦合到接收来自发射机的第一天线和第二天线中的至少一个的输入信号。 测量电路产生对应于输入信号幅度的输出信号。 控制电路（726）被耦合以接收输出信号，第一参考信号（...）和第二参考信号（...）。 控制电路被配置为响应于输出信号，第一参考信号和第二参考信号的比较而产生控制信号。

公开(公告)号：US07522674B2

公开(公告)日：2009-04-21

申请号：US10884363

申请日：2004-07-02

申请人： Srinath Hosur ,  Michael O. Polley ,  Manish Goel

发明人： Srinath Hosur ,  Michael O. Polley ,  Manish Goel

IPC分类号： H04B7/04 ,  H04L27/28

CPC分类号： H04L1/0083 ,  H04B7/0678 ,  H04L7/041 ,  H04L7/06 ,  H04L27/2613

摘要： A device and a method of characterizing a communications channel. The method includes transmitting a first part of a packet preamble using two or more antennas and transmitting a second part of the packet preamble using the two or more antennas. Each antenna transmits an orthogonal encoding of the second part of the packet preamble. The method also includes transmitting a packet header using the two or more antennas and transmitting a packet payload using the two or more antennas. Each antenna transmits an orthogonal encoding of the packet header. The packet payload may be encoded across the transmissions of the two or more antennas.

摘要翻译： 一种表征通信信道的设备和方法。 该方法包括使用两个或多个天线发送分组前导码的第一部分，并使用两个或更多个天线发送分组前导码的第二部分。 每个天线发送分组前同步码的第二部分的正交编码。 该方法还包括使用两个或多个天线发送分组报头，并使用两个或更多个天线发送分组有效载荷。 每个天线发送分组报头的正交编码。 分组有效载荷可以跨越两个或更多个天线的传输进行编码。

公开(公告)号：US07382719B2

公开(公告)日：2008-06-03

申请号：US10811519

申请日：2004-03-29

申请人： Srikanth Gummadi ,  Srinath Hosur ,  Peter Murphy

发明人： Srikanth Gummadi ,  Srinath Hosur ,  Peter Murphy

IPC分类号： H04J11/00 ,  H04B1/00

CPC分类号： H04B7/028 ,  H04B17/20

摘要： A method comprising encoding a plurality of signals according to a predetermined negation scheme and transmitting the plurality of signals, wherein each signal is transmitted by way of a wireless channel. The method further comprises receiving a signal, wherein the received signal is a combination of the plurality of transmitted signals, and interpolating between data in the received signal to generate a plurality of systems of equations. The method further comprises solving the plurality of systems of equations to determine a gain and phase shift applied to each of the plurality of transmitted signals by a corresponding wireless channel.

摘要翻译： 一种方法，包括根据预定的否定方案对多个信号进行编码并发送多个信号，其中每个信号通过无线信道发送。 该方法还包括接收信号，其中所接收的信号是多个发射信号的组合，并且在接收信号中的数据之间进行内插以产生多个方程组。 该方法还包括解决多个等式系统以通过相应的无线信道确定应用于多个发射信号中的每一个的增益和相移。

公开(公告)号：US07349667B2

公开(公告)日：2008-03-25

申请号：US10044638

申请日：2001-10-19

申请人： David Patrick Magee ,  Srinath Hosur

发明人： David Patrick Magee ,  Srinath Hosur

IPC分类号： H04B1/00 ,  H04B15/00

CPC分类号： H04L27/2647

摘要： A system and method facilitate estimating noise in a received signal. The received signal is formed of a plurality of tones, such as training tones and data tones. Noise is estimated at the training tones, which generally comprise a lesser number of the tones in the received signal than the data tones. The estimated noise at the training tones can be employed to facilitate demodulating and/or decoding data tones in the received signal. In one aspect, the estimated training tone noise can be utilized by a beamformer.

摘要翻译： 一种系统和方法便于估计接收信号中的噪声。 所接收的信号由多个音调形成，诸如训练音调和数据音调。 在训练音调下估计噪声，训练音通常包括比数据音调更少的接收信号中的音调。 可以采用训练音调下的估计噪声来促进在接收信号中解调和/或解码数据音调。 在一个方面，估计的训练音噪声可以被波束形成器利用。

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：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：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：US20060008023A1

公开(公告)日：2006-01-12

申请号：US10886480

申请日：2004-07-07

申请人： David Magee ,  Srinath Hosur

发明人： David Magee ,  Srinath Hosur

IPC分类号： H04B7/02

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。