公开(公告)号：US20120045017A1

公开(公告)日：2012-02-23

申请号：US13286405

申请日：2011-11-01

申请人： Tarkesh Pande ,  Srinath Hosur ,  Anuj Batra

发明人： Tarkesh Pande ,  Srinath Hosur ,  Anuj Batra

IPC分类号： H04L27/00

CPC分类号： H04B7/0417 ,  H04B7/0626 ,  H04B7/0634 ,  H04B7/0639 ,  H04B7/066 ,  H04L5/0023 ,  H04L25/0248 ,  H04L25/03343 ,  H04L2025/03426 ,  H04L2025/03802

摘要： Embodiments provide a transform-based method for representing steering matrices in transmit beamforming for a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system. Beamforming embodiments generate a transform-based representation of steering matrices for at least a subset of sub-carriers for which channel information is known. In some embodiments, a beamformer is able to receive transform matrices information for at least a subset of channel sub-carriers, and generate corresponding channel sub-carrier steering matrices. Some embodiments of a beamformee are able to map at least a subset of channel sub-carrier steering matrices to corresponding transform matrices information prior to transmitting the transform matrix information to a beamformer. Other embodiments of a beamformer are able to receive channel information for at least a subset of sub-carriers of a channel, and compute a transform-based representation of a steering matrix for each sub-carrier for which channel information is known.

摘要翻译： 实施例提供了一种用于表示多输入多输出正交频分复用（MIMO-OFDM）系统的发射波束成形中的导引矩阵的基于变换的方法。 波束形成实施例为已知信道信息的子载波的至少一个子集生成导向矩阵的基于变换的表示。 在一些实施例中，波束形成器能够接收用于信道子载波的至少子集的变换矩阵信息，并且生成相应的信道子载波导引矩阵。 在将变换矩阵信息发送到波束形成器之前，波束形成器的一些实施例能够将信道子载波导引矩阵的至少一个子集映射到对应的变换矩阵信息。 波束形成器的其他实施例能够接收信道的子载波的至少一个子集的信道信息，并且为已知信道信息的每个子载波计算导频矩阵的基于变换的表示。

公开(公告)号：USRE42681E1

公开(公告)日：2011-09-06

申请号：US11124595

申请日：2005-05-05

申请人： Anand G. Dabak ,  Srinath Hosur

发明人： Anand G. Dabak ,  Srinath Hosur

IPC分类号： H03C7/02 ,  H04B1/02 ,  H04B7/02

CPC分类号： H04B7/0634 ,  H04B7/061 ,  H04B7/0669 ,  H04B7/0673 ,  H04L1/0618

摘要： A wireless communication system (40). The system comprises transmitter circuitry (42) comprising encoder circuitry (44) for receiving a plurality of symbols (Si). The system further comprises a plurality of antennas (AT1-AT4) coupled to the transmitter circuitry and for transmitting signals from the transmitter circuitry to a receiver (UST), wherein the signals are responsive to the plurality of symbols. Further, the encoder circuitry is for applying open loop diversity and closed loop diversity to the plurality of symbols to form the signals.

摘要翻译： 一种无线通信系统（40）。 该系统包括发射机电路（42），包括用于接收多个符号（Si）的编码器电路（44）。 该系统还包括耦合到发射机电路的多个天线（AT1-AT4），并用于将信号从发射机电路传输到接收机（UST），其中信号响应于多个符号。 此外，编码器电路用于向多个符号施加开环分集和闭环分集以形成信号。

公开(公告)号：US07961826B2

公开(公告)日：2011-06-14

申请号：US11928863

申请日：2007-10-30

申请人： Deric W. Waters ,  Oren Peles ,  Anuj Batra ,  Srinath Hosur ,  Doron Burshtein

发明人： Deric W. Waters ,  Oren Peles ,  Anuj Batra ,  Srinath Hosur ,  Doron Burshtein

IPC分类号： H04B7/10 ,  H04L1/02

CPC分类号： H04L25/03242 ,  H04L2025/03414 ,  H04L2025/03426

摘要： A Multiple-input Multiple-Output (MIMO) receiver is provided. The MIMO receiver comprises a parameterized sphere detector having two search modes. During a first search mode, the parameterized sphere detector enumerates a number of best candidate vectors up to a fixed parameter value. During a second search mode, the parameterized sphere detector enumerates additional candidate vectors using a greedy search until a predetermined number of candidate vectors have been enumerated.

摘要翻译： 提供多输入多输出（MIMO）接收机。 MIMO接收机包括具有两个搜索模式的参数化球体检测器。 在第一搜索模式期间，参数化球体检测器枚举多达一个固定参数值的最佳候选向量。 在第二搜索模式期间，参数化球体检测器使用贪婪搜索枚举附加候选向量，直到已经列举了预定数量的候选向量。

公开(公告)号：US07450672B2

公开(公告)日：2008-11-11

申请号：US11246618

申请日：2005-10-07

申请人： Alan Gatherer ,  Tarik Muharemovic ,  Everest W. Huang ,  Srinath Hosur

发明人： Alan Gatherer ,  Tarik Muharemovic ,  Everest W. Huang ,  Srinath Hosur

IPC分类号： H04B7/10

CPC分类号： H04L1/06 ,  H04L1/005 ,  H04L1/0066 ,  H04L1/0071 ,  H04L1/0618

摘要： An apparatus and method for transmitting and receiving a bit stream. On the transmission side, coded bits (Y.sub.t) and an interleaved version of the coded bits (X.sub.t) are separately modulated and transmitted. On the reception side, a priori output probabilities produced by a probability generator (34) are combined (112) and then input to a SISO decoder (111). Combined a posteriori output probabilities (115) produced by the SISO decoder are split (113) and then fed back to the probability generator.

摘要翻译： 一种用于发送和接收比特流的装置和方法。 在发送侧，分别调制和发送编码比特（Y.sub.t）和编码比特（X.sub.t）的交织版本。 在接收侧，组合由概率发生器（34）产生的先验输出概率（112），然后输入到SISO解码器（111）。 组合由SISO解码器产生的后验输出概率（115）被分离（113），然后反馈给概率发生器。

公开(公告)号：US20080273497A1

公开(公告)日：2008-11-06

申请号：US11800703

申请日：2007-05-04

申请人： Xiaolin Lu ,  Rao Venkatasadasiva ,  Zigang Yang ,  Anand G. Dabak ,  Srinath Hosur ,  Badri Varadarajan ,  Susan Yim

发明人： Xiaolin Lu ,  Rao Venkatasadasiva ,  Zigang Yang ,  Anand G. Dabak ,  Srinath Hosur ,  Badri Varadarajan ,  Susan Yim

IPC分类号： H04Q7/00

CPC分类号： H04H20/26 ,  H04H20/67 ,  H04W36/08 ,  H04W36/30 ,  H04W36/36

摘要： A method of wireless handover in a broadcast network (FIGS. 5 and 8) is disclosed. A wireless receiver (FIG. 4) receives a first signal (N) from a first transmitter (f1). The receiver measures a signal strength (RSSI) of the first signal. The strength of the first signal is compared to a first threshold (T0). The receiver receives a second signal (N+3) from a second transmitter (f3) in response to the step of comparing. The first and the second signals are sent to an application processor (120). The wireless receiver continues to receive the first and second signals until the application processor terminates receiving one of the first and second signals.

摘要翻译： 公开了广播网络中的无线切换的方法（图5和图8）。 无线接收器（图4）从第一发射机（f 1> 1）接收第一信号（N）。 接收机测量第一信号的信号强度（RSSI）。 将第一信号的强度与第一阈值（T 0> 0）进行比较。 响应于比较步骤，接收机从第二发射机（f 3> 3）接收第二信号（N + 3）。 第一和第二信号被发送到应用处理器（120）。 无线接收机继续接收第一和第二信号，直到应用处理器终止接收第一和第二信号之一。

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：US20070253499A1

公开(公告)日：2007-11-01

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：US07180965B2

公开(公告)日：2007-02-20

申请号：US10172557

申请日：2002-06-14

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

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

IPC分类号： H03D1/00 ,  H04B3/46 ,  H04L27/08

CPC分类号： H04L27/2657 ,  H04L25/0212 ,  H04L25/0236 ,  H04L27/2675

摘要： Methods are presented for phase estimation and compensation in Orthogonal Frequency Division Multiplex systems. The methods include the step of extracting training tones from a received digitized data burst. Some of the methods further include the steps of determining a channel impulse response based on the extracted tones; estimating phase shift caused by common phase noise; correcting the impulse response and performing a Fast Fourier transform to provide a channel estimate. Some of the methods include estimating the phase shift caused by common phase noise before an average impulse response is updated with the current impulse impulse. Some of the methods include frequency shifting the spectrum of the channel impulse response and providing partial estimates.

摘要翻译： 在正交频分复用系统中提出了相位估计和补偿的方法。 所述方法包括从接收到的数字化数据脉冲串中提取训练音调的步骤。 一些方法还包括基于提取的音调确定信道脉冲响应的步骤; 估计由公共相位噪声引起的相移; 校正脉冲响应并执行快速傅里叶变换以提供信道估计。 一些方法包括在用当前脉冲脉冲更新平均脉冲响应之前估计由公共相位噪声引起的相移。 一些方法包括频移信道脉冲响应的频谱并提供部分估计。

公开(公告)号：US20060280230A1

公开(公告)日：2006-12-14

申请号：US11438149

申请日：2006-05-22

申请人： Anand Dabak ,  Sundararajan Sriram ,  Srinath Hosur

发明人： Anand Dabak ,  Sundararajan Sriram ,  Srinath Hosur

IPC分类号： H04B1/00

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 secondary 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 in the plurality of sequences. The third sequence comprises 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）和辅同步码（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（50 1）。 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（50）。 第二序列从多个序列中选择。 多个序列中的每一个相对于多个序列中的所有其他序列是正交的。 第三序列包括来自第一序列的比特的子集。

公开(公告)号：US07120213B2

公开(公告)日：2006-10-10

申请号：US10037179

申请日：2001-10-23

申请人： Alan Gatherer ,  Tarik Muharemovic ,  Everest W. Huang ,  Srinath Hosur

发明人： Alan Gatherer ,  Tarik Muharemovic ,  Everest W. Huang ,  Srinath Hosur

IPC分类号： H04B7/10

CPC分类号： H04L1/06 ,  H04L1/005 ,  H04L1/0066 ,  H04L1/0071 ,  H04L1/0618

摘要： An apparatus and method for transmitting and receiving a bit stream. On the transmission side, coded bits (Y.sub.t) and an interleaved version of the coded bits (X.sub.t) are separately modulated and transmitted. On the reception side, a priori output probabilities produced by a probability generator (34) are combined (112) and then input to a SISO decoder (111). Combined a posteriori output probabilities (115) produced by the SISO decoder are split (113) and then fed back to the probability generator.