公开(公告)号：US20050153723A1

公开(公告)日：2005-07-14

申请号：US10755603

申请日：2004-01-12

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

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

IPC分类号： H04W88/08 ,  H04Q7/00

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：US20050035885A1

公开(公告)日：2005-02-17

申请号：US10639418

申请日：2003-08-11

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

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

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：US20050147022A1

公开(公告)日：2005-07-07

申请号：US10744147

申请日：2003-12-22

申请人： Srinath Hosur ,  Srikanth Gummadi ,  Anuj Batra ,  Michael Polley

发明人： Srinath Hosur ,  Srikanth Gummadi ,  Anuj Batra ,  Michael Polley

IPC分类号： H04B7/005 ,  H04J11/00 ,  H04L27/26

CPC分类号： H04W52/325 ,  H04L27/2614 ,  H04L27/2626 ,  H04W52/367 ,  H04W52/52

摘要： A preamble transmit power tailoring system for use with an Orthogonal Frequency Division Multiplexing (OFDM) transmitter, a method of tailoring preamble transmit power, and an OFDM transmitter. In one embodiment, the preamble transmit power tailoring system includes (1) a peak power estimator configured to calculate, based on a payload to be transmitted by the OFDM transmitter and an associated transmit power limitation value, an available power headroom and (2) a preamble power enhancer, associated with the peak power estimator, configured to increase transmit power of at least a portion of a preamble for the payload subject to the available power headroom.

摘要翻译： 一种与正交频分复用（OFDM）发射机一起使用的前导码发射功率调整系统，一种定制前导码发送功率的方法和一种OFDM发射机。 在一个实施例中，前导码发射功率调整系统包括：（1）峰值功率估计器，被配置为基于要由OFDM发射机发射的有效载荷和相关联的发射功率限制值，计算可用的功率余量，以及（2） 与峰值功率估计器相关联的前导码功率增强器被配置为增加对可用功率余量的有效载荷的前导码的至少一部分的发射功率。

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：US20050245199A1

公开(公告)日：2005-11-03

申请号：US11062729

申请日：2005-02-22

申请人： Anuj Batra ,  Nathan Belk ,  Anand Dabak ,  Michael DiRenzo ,  Manish Goel ,  Jin-Meng Ho ,  Srinath Hosur ,  Xiaolin Lu ,  David Magee ,  Donald Shaver ,  Hirohisa Yamaguchi

发明人： Anuj Batra ,  Nathan Belk ,  Anand Dabak ,  Michael DiRenzo ,  Manish Goel ,  Jin-Meng Ho ,  Srinath Hosur ,  Xiaolin Lu ,  David Magee ,  Donald Shaver ,  Hirohisa Yamaguchi

IPC分类号： H04B1/38

摘要： A wireless transceiver 10 is provided that includes a configurable analog component 14 and a controller portion 18. The configurable analog component 14 is operable to receive an input radio frequency signal and to transmit the output radio frequency signal. The controller portion 18 is operable to promote adjustment of a bandwidth of the configurable analog component 14 from at least a first bandwidth to a second bandwidth.

摘要翻译： 提供了一种无线收发机10，其包括可配置的模拟组件14和控制器部分18。 可配置模拟组件14可操作以接收输入射频信号并传输输出射频信号。 控制器部分18可操作以促进将可配置模拟组件14的带宽从至少第一带宽调整到第二带宽。

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：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：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：US20100180173A1

公开(公告)日：2010-07-15

申请号：US12686929

申请日：2010-01-13

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

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

IPC分类号： H04L1/18 ,  H03M13/05 ,  G06F11/10 ,  G06F11/14

CPC分类号： H04L1/1812 ,  H04L1/188 ,  H04L1/1893

摘要： Embodiments of the invention provide a system and method of hybrid automatic repeat-request (HARQ) processing. A viterbi decoder is coupled to and follows a descrambler. After the signal has been de-scrambled, it can be stored in a memory in case it needs to be recombined with another packet. This means that the log-likelihood ratios LLRs for each transmitted bit are stored in memory using a finite number of bits (for example, between 4 and 12 bits). If the packet that is currently being processed contains retransmitted information, then the de-scrambled output stored from a previous packet containing the same information can be loaded and combined with the current packet.

摘要翻译： 本发明的实施例提供了一种混合自动重传请求（HARQ）处理的系统和方法。 维特比解码器耦合到并跟随解扰器。 在信号被解除加扰之后，如果需要与另一个数据包重新组合，则可将其存储在存储器中。 这意味着每个发送的比特的对数似然比LLRs使用有限数量的比特（例如，在4比特和12比特之间）存储在存储器中。 如果当前处理的分组包含重发信息，则可以将包含相同信息的先前分组存储的去加扰输出加载并与当前分组组合。