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：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：US07321564B2

公开(公告)日：2008-01-22

申请号：US10765009

申请日：2004-01-26

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

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

IPC分类号： H04J1/16

CPC分类号： H04B7/02 ,  H04B1/7105 ,  H04B1/7107 ,  H04L1/0631 ,  H04L1/0656 ,  H04L27/2647

摘要： A Hybrid IMMSE-LMMSE receiver processing technique predicts performance of and selects between iterative and non-iterative decoding of symbols based on an intelligent metric. Based on a pre-specified criterion, the receiver determines if a correct first-stage decision is made or not. If a correct decision is made, then it follows iterative processing like in BLAST. Alternatively, if a wrong decision is found to have occurred, the receiver resorts to LMMSE estimation processing.

摘要翻译： 混合IMMSE-LMMSE接收机处理技术基于智能度量预测符号的迭代和非迭代解码之间的性能并进行选择。 根据预先指定的标准，接收机确定是否做出正确的第一阶段决定。 如果做出正确的决定，那么它将像BLAST一样进行迭代处理。 或者，如果发现错误的决定已经发生，接收机将采用LMMSE估计处理。

公开(公告)号：US20070089042A1

公开(公告)日：2007-04-19

申请号：US11470916

申请日：2006-09-07

申请人： Xiaolin Lu ,  Srinath Hosur ,  Manish Goel ,  Michael Polley

发明人： Xiaolin Lu ,  Srinath Hosur ,  Manish Goel ,  Michael Polley

IPC分类号： H03M13/00

CPC分类号： H04W56/009 ,  H04L7/048 ,  H04L7/10 ,  H04W24/00 ,  H04W74/00

摘要： A resynchronization method for use in a data communication system having a first device configured to transmit data at a symbol rate to a second device. The second device includes a Reed Solomon (RS) decoder having a RS lock indicator and a Moving Picture Experts Group (MPEG) Protocol Interface (MPI) having a MPI lock indicator, wherein the RS and MPI lock indicators are monitored. Four different states, defined by the values of the RS and MPI lock indicators, determine whether the data communication system will wait for the RS decoded and the MPI hardware block to resynchronize, whether an intermediate-subset of the channel acquisition algorithm is performed or whether the entire channel acquisition algorithm is performed. The method of resynchronization described herein recovers synchronization within a predetermined time without the layers above the physical link layer having knowledge.

摘要翻译： 一种用于具有第一设备的数据通信系统中的再同步方法，该第一设备被配置为以符号速率向第二设备发送数据。 第二装置包括具有RS锁指示器的Reed Solomon（RS）解码器和具有MPI锁定指示器的运动图像专家组（MPEG）协议接口（MPI），其中监视RS和MPI锁定指示符。 由RS和MPI锁指示器的值定义的四种不同状态确定数据通信系统是否将等待RS解码和MPI硬件块重新同步，无论是执行信道获取算法的中间子集还是执行 执行整个信道获取算法。 本文所述的重新同步的方法在预定时间内恢复同步，而不具有具有知识的物理链路层之上的层。

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：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.