公开(公告)号：US08325856B2

公开(公告)日：2012-12-04

申请号：US11860505

申请日：2007-09-24

申请人： Raghuraman Krishnamoorthi ,  Tao Tian ,  Fuyun Ling ,  Yuheng Huang

发明人： Raghuraman Krishnamoorthi ,  Tao Tian ,  Fuyun Ling ,  Yuheng Huang

IPC分类号： H04L27/06

CPC分类号： H04L27/2675 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/261 ,  H04L27/2655

摘要： An acquisition module includes a coherent correlator configured to receive a transmission having a pilot signal and correlate the received transmission with a local copy of the pilot signal to produce a first output, a delayed correlator configured to delay the first output and correlate the first output with the delayed first output to produce a second output, and a detector configured to detect the pilot signal in the transmission based on the second output.

摘要翻译： 获取模块包括相干相关器，其被配置为接收具有导频信号的传输并将接收到的传输与导频信号的本地副本相关联以产生第一输出，延迟相关器被配置为延迟第一输出并将第一输出与 延迟的第一输出以产生第二输出;以及检测器，被配置为基于所述第二输出来检测所述传输中的导频信号。

公开(公告)号：US07991040B2

公开(公告)日：2011-08-02

申请号：US11519256

申请日：2006-09-11

申请人： Durk L. van Veen ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

发明人： Durk L. van Veen ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

IPC分类号： H04B1/00

CPC分类号： H04L27/2614 ,  H04L27/2615

摘要： Methods and apparatus for reduction of a peak to average ratio for an OFDM transmit signal. In an aspect, a method is provided for reducing a peak to average ratio of a transmit waveform. The method includes obtaining a primary scrambler sequence, generating a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining the primary and secondary scrambler sequences to produce a PAR reduction sequence. In another aspect, an apparatus is provided for reducing a peak to average ratio of a transmit waveform. The apparatus includes a secondary generator configured to generate a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining logic configured to combine a primary scrambler sequence and the secondary scrambler sequences to produce a PAR reduction sequence.

摘要翻译： 降低OFDM发射信号的峰均比的方法和装置。 在一方面，提供了一种降低发射波形的峰均比的方法。 该方法包括：获得主加扰器序列，产生具有基于要加扰的数据的长度特性的次扰频序列，以及组合所述主加扰序列和次加扰序列以产生PAR减少序列。 在另一方面，提供一种用于减小发射波形的峰均比的装置。 该装置包括辅助发生器，其被配置为产生具有基于要加扰的数据的长度特性的二次扰频器序列，以及被配置为组合主加扰器序列和次加扰器序列以产生PAR减少序列的组合逻辑。

公开(公告)号：US20110002413A1

公开(公告)日：2011-01-06

申请号：US12496473

申请日：2009-07-01

申请人： Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Fuyun Ling ,  Ben A. Saidi ,  William A. Drennen

发明人： Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Fuyun Ling ,  Ben A. Saidi ,  William A. Drennen

IPC分类号： H04L27/00

CPC分类号： H04L5/0053 ,  H04L5/0073

摘要： A methodology for transmitter identification for a single frequency network is provided using a single CW tone. The tone can be transmitted outside the transmitter's active band. It is possible to arrive at significant overlap between the tone coverage area and the coverage area of a neighboring transmitter without disturbing the operations by picking the tone location and power appropriately.

摘要翻译： 使用单个CW音调提供用于单频网络的发射机识别的方法。 音调可以在发射器的有源频带外传输。 可以通过适当地选择音调位置和功率来抵消音调覆盖区域和相邻发射机的覆盖区域之间的重大重叠，而不会干扰操作。

公开(公告)号：US20060215793A1

公开(公告)日：2006-09-28

申请号：US11373369

申请日：2006-03-10

申请人： Linbo Li ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

发明人： Linbo Li ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

IPC分类号： H04L27/08

CPC分类号： H03G3/3052 ,  H03F1/0205 ,  H03F3/24 ,  H03F2200/294 ,  H03F2200/372 ,  H03G1/0088 ,  H03G3/3068 ,  H04B1/109

摘要： Systems and methods are provided for tracking and compensating for analog gain mismatches or changes in a receiver. In an embodiment, a method is provided to track analog gain step magnitudes during operation of a device. The method includes employing an error signal between an automatic gain control (AGC) output and a reference level as input to a gain step magnitude tracking component. This also includes determining at least one compensation value from the AGC output to update a nominal gain step magnitude that tracks an actual gain step magnitude.

摘要翻译： 提供系统和方法来跟踪和补偿接收机中的模拟增益失配或变化。 在一个实施例中，提供了一种用于在设备操作期间追踪模拟增益步幅的方法。 该方法包括采用自动增益控制（AGC）输出和参考电平之间的误差信号作为增益步长跟踪分量的输入。 这还包括从AGC输出确定至少一个补偿值以更新追踪实际增益步幅的标称增益步幅。

公开(公告)号：US08250428B2

公开(公告)日：2012-08-21

申请号：US12276313

申请日：2008-11-22

申请人： Thomas Sun ,  Fuyun Ling ,  Jing Jiang ,  Raghuraman Krishnamoorthi ,  Tao Tian ,  Kent Walker

发明人： Thomas Sun ,  Fuyun Ling ,  Jing Jiang ,  Raghuraman Krishnamoorthi ,  Tao Tian ,  Kent Walker

IPC分类号： H03M13/00

CPC分类号： H04L1/0071 ,  H03M13/27 ,  H03M13/2957 ,  H04L1/0041 ,  H04L2001/0098

摘要： Methods and systems are described for scheduling data in an FLO system. The method may include turbo encoding the data, and dividing a packet of the turbo-coded data into a plurality of subpackets. The method may include scheduling the turbo-coded packet of data so as to distribute the data across multiple frames of a superframe, by transmitting each one of the subpackets during a different frame of the superframe to increase time diversity. The turbo-coded packet of data may comprise systematic bits and parity bits. The method may include separately scheduling the systematic bits and the parity bits during different frames of the superframe.

摘要翻译： 描述了用于在FLO系统中调度数据的方法和系统。 该方法可以包括对数据进行turbo编码，并将turbo编码数据的分组划分成多个子分组。 该方法可以包括通过在超帧的不同帧期间发送每个子分组以增加时间分集来调度数据的turbo编码分组以便分布跨超帧的多个帧的数据。 turbo编码的数据分组可以包括系统比特和奇偶校验比特。 该方法可以包括在超帧的不同帧期间单独地调度系统比特和奇偶校验比特。

公开(公告)号：US20070230596A1

公开(公告)日：2007-10-04

申请号：US11519256

申请日：2006-09-11

申请人： Durk L. van Veen ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

发明人： Durk L. van Veen ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

IPC分类号： H04K1/10

CPC分类号： H04L27/2614 ,  H04L27/2615

摘要： Methods and apparatus for reduction of a peak to average ratio for an OFDM transmit signal. In an aspect, a method is provided for reducing a peak to average ratio of a transmit waveform. The method includes obtaining a primary scrambler sequence, generating a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining the primary and secondary scrambler sequences to produce a PAR reduction sequence. In another aspect, an apparatus is provided for reducing a peak to average ratio of a transmit waveform. The apparatus includes a secondary generator configured to generate a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining logic configured to combine a primary scrambler sequence and the secondary scrambler sequences to produce a PAR reduction sequence.

摘要翻译： 降低OFDM发射信号的峰均比的方法和装置。 在一方面，提供了一种降低发射波形的峰均比的方法。 该方法包括：获得主加扰器序列，产生具有基于要加扰的数据的长度特性的次扰频序列，以及组合所述主加扰序列和次加扰序列以产生PAR减少序列。 在另一方面，提供一种用于减小发射波形的峰均比的装置。 该装置包括辅助发生器，其被配置为产生具有基于要加扰的数据的长度特性的二次扰频器序列，以及被配置为组合主加扰器序列和次加扰器序列以产生PAR减少序列的组合逻辑。

公开(公告)号：US20070217525A1

公开(公告)日：2007-09-20

申请号：US11376986

申请日：2006-03-15

申请人： Bojan Vrcelj ,  Raghuraman Krishnamoorthi ,  Seong Chung ,  Fuyun Ling

发明人： Bojan Vrcelj ,  Raghuraman Krishnamoorthi ,  Seong Chung ,  Fuyun Ling

IPC分类号： H04K1/10 ,  H04L27/06

CPC分类号： H04L27/2657 ,  H04L27/2607 ,  H04L27/2665 ,  H04L27/2678 ,  H04L27/2695

摘要： A frequency tracking method and apparatus is provided. A receiver receives OFDM symbols and determines associated frequency offset. A frequency error estimator selects a cross correlation window for determining frequency offset based on timing offset. A symbol timing estimator is used to determine the timing offset.

摘要翻译： 提供了一种频率跟踪方法和装置。 接收机接收OFDM符号并确定相关的频率偏移。 频率误差估计器基于定时偏移来选择用于确定频率偏移的互相关窗口。 使用符号定时估计器来确定定时偏移。

公开(公告)号：US20060215540A1

公开(公告)日：2006-09-28

申请号：US11373001

申请日：2006-03-09

申请人： Raghuraman Krishnamoorthi ,  Fuyun Ling ,  Rajiv Vijayan

发明人： Raghuraman Krishnamoorthi ,  Fuyun Ling ,  Rajiv Vijayan

IPC分类号： H04J11/00

CPC分类号： H04L27/2644

摘要： Systems and methods are provided for transmitting OFDM information via IFFT up-sampling components that transmit data at a higher sampling rate than conventional systems to simplify filter requirements and mitigate leakage between symbols. In one embodiment, an NL point IFFT is performed on a zero inserted set of frequency domain symbols. In another embodiment, the NL point IFFT is further optimized by exploiting the fact that (N−1) L of the frequency domain symbols are zero. This enables an embodiment that consists of a pre-processor that multiplies the input samples by complex phase factors, followed by L point IFFTs.

摘要翻译： 提供了系统和方法，用于通过IFFT上采样组件传输OFDM信息，该组件以比常规系统更高的采样速率传输数据，以简化滤波器要求并减轻符号之间的泄漏。 在一个实施例中，对零插入的频域符号组执行NL点IFFT。 在另一个实施例中，通过利用频域符号的（N-1）L为零的事实进一步优化NL点IFFT。 这使得能够由预处理器组成的实施例，该预处理器将输入样本乘以复相位因子，随后是L点IFFT。

公开(公告)号：US20050063298A1

公开(公告)日：2005-03-24

申请号：US10931324

申请日：2004-08-31

申请人： Fuyun Ling ,  Alok Gupta ,  Raghuraman Krishnamoorthi ,  Ramaswamy Murali ,  Rajiv Vijayan ,  Bojan Vrcelj

发明人： Fuyun Ling ,  Alok Gupta ,  Raghuraman Krishnamoorthi ,  Ramaswamy Murali ,  Rajiv Vijayan ,  Bojan Vrcelj

IPC分类号： H04B3/10 ,  H04J20060101 ,  H04J1/16 ,  H04J11/00

CPC分类号： H04L27/2657 ,  H04L5/005 ,  H04L25/022 ,  H04L27/2613 ,  H04L27/2662 ,  H04L27/2665 ,  H04L2027/003

摘要： In an OFDM system, a transmitter broadcasts a first TDM pilot on a first set of subbands followed by a second TDM pilot on a second set of subbands in each frame. The subbands in each set are selected from among N total subbands such that (1) an OFDM symbol for the first TDM pilot contains at least S1 identical pilot-1 sequences of length L1 and (2) an OFDM symbol for the second TDM pilot contains at least S2 identical pilot-2 sequences of length L2, where L2>L1, S1·L1=N, and S2·L2=N. The transmitter may also broadcast an FDM pilot. A receiver processes the first TDM pilot to obtain frame timing (e.g., by performing correlation between different pilot-1 sequences) and further processes the second TDM pilot to obtain symbol timing (e.g., by detecting for the start of a channel impulse response estimate derived from the second TDM pilot).

摘要翻译： 在OFDM系统中，发射机在第一组子带上广播第一TDM导频，随后在每帧中的第二组子带上接收第二TDM导频。 每个组中的子带从N个总子带中选出，使得（1）第一TDM导频的OFDM符号包含长度为L1的至少S1个相同的导频1序列，以及（2）第二TDM导频的OFDM符号包含 至少S2个长度为L2的导频-2序列，其中L2> L1，S1.L1 = N，S2.L2 = N。 发射机还可以广播FDM导频。 接收机处理第一TDM导频以获得帧定时（例如，通过执行不同导频-1序列之间的相关）并且进一步处理第二TDM导频以获得符号定时（例如，通过检测导出的信道脉冲响应估计的开始 从第二TDM导频）。

公开(公告)号：US09036567B2

公开(公告)日：2015-05-19

申请号：US12699596

申请日：2010-02-03

申请人： Raghuraman Krishnamoorthi ,  Gordon Kent Walker ,  Fuyun Ling

发明人： Raghuraman Krishnamoorthi ,  Gordon Kent Walker ,  Fuyun Ling

IPC分类号： H04W72/04 ,  H04N21/63 ,  H04N21/2383 ,  H04N21/2385 ,  H04N21/438

CPC分类号： H04N21/631 ,  H04N21/2383 ,  H04N21/2385 ,  H04N21/4382

摘要： Methods, systems, and apparatus, including computer programs encoded on computer readable storage media, for increasing utilization of transmission resources by mapping data from a block of layered codec data onto a plurality of logical channels for transmission of the mapped data. Resource utilization may also be improved by mapping data from at least two layers of a block of layered of codec data onto a logical channel that supports only a single data channel carried by a transmit modulation scheme.

摘要翻译： 方法，系统和装置，包括在计算机可读存储介质上编码的计算机程序，用于通过将来自分层编解码器数据块的数据映射到用于传输映射数据的多个逻辑信道上的数据来增加传输资源的利用。 也可以通过将来自编解码器数据分层的至少两层的数据映射到仅支持由发送调制方案承载的单个数据信道的逻辑信道上来提高资源利用。