公开(公告)号：US08571066B2

公开(公告)日：2013-10-29

申请号：US12051209

申请日：2008-03-19

申请人： Binita Gupta ,  An Mei Chen ,  Devarshi Shah ,  Linbo Li ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi ,  Taoufik Tani

发明人： Binita Gupta ,  An Mei Chen ,  Devarshi Shah ,  Linbo Li ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi ,  Taoufik Tani

IPC分类号： H04J1/00

CPC分类号： H04W76/11 ,  H04W48/12 ,  H04W72/02 ,  H04W76/15

摘要： Methods and apparatus for RF channel switching in a multi-frequency network. In an aspect, a method includes identifying a multiplex set that comprises one or more content flows, wherein the multiplex set is one of a vertical multiplex (VM) set and a unified multiplex (UM) set, generating an overhead message that associates one or more RF carrier frequencies with the one or more content flows, and transmitting the overhead message over the multi-frequency network. An apparatus includes input logic configured to receive an overhead message that associates one or more content flows with one or more RF carrier frequencies, and processing logic configured to detect a channel switch event that identifies a selected content flow, determine a selected RF carrier frequency associated with the selected content flow based on the overhead message, and switch to the selected RF carrier frequency to receive the selected content flow.

摘要翻译： 多频网络中RF信道切换的方法和装置。 一方面，一种方法包括识别包括一个或多个内容流的多路复用集合，其中多路复用集合是垂直多路复用（VM）集合和统一多路复用（UM）集合之一，生成将开销消息与一个或多个内容流相关联的开销消息， 具有一个或多个内容流的更多RF载波频率，以及通过多频网络发送开销消息。 一种装置包括输入逻辑，其被配置为接收将一个或多个内容流与一个或多个RF载波频率相关联的开销消息，以及被配置为检测识别所选内容流的信道切换事件的处理逻辑，确定所选择的RF载波频率相关联 所选择的内容流程基于开销消息，并且切换到所选择的RF载波频率以接收所选择的内容流。

公开(公告)号：US08443255B2

公开(公告)日：2013-05-14

申请号：US12869555

申请日：2010-08-26

申请人： Jing Jiang ,  Tao Tian ,  Raghuraman Krishnamoorthi ,  Xinmiao Zhang ,  Ashok Mantravadi ,  Krishna Mukkavilli

发明人： Jing Jiang ,  Tao Tian ,  Raghuraman Krishnamoorthi ,  Xinmiao Zhang ,  Ashok Mantravadi ,  Krishna Mukkavilli

IPC分类号： H03M13/00

CPC分类号： H03M13/1111 ,  H03M13/1191 ,  H03M13/1515 ,  H03M13/2966 ,  H03M13/616 ,  H04L1/005 ,  H04L1/0057

摘要： A method of generating a parity check matrix for iterative decoding of a linear block code includes: determining a set of parity check vectors for the linear block code; ordering according to Hamming weight non-zero parity check vectors of the set; selecting a criterion for generating the parity check matrix; and building the parity check matrix by incrementally selecting according to the criterion a parity check vector for each consecutive row of the parity check matrix, wherein the parity check vector is selected from the ordered non-zero parity check vectors remaining in the set.

摘要翻译： 一种生成用于线性块码的迭代解码的奇偶校验矩阵的方法包括：确定用于线性块码的一组奇偶校验向量; 根据汉明重量非零奇偶校验向量进行排序; 选择用于生成奇偶校验矩阵的标准; 以及通过根据所述标准逐渐选择所述奇偶校验矩阵的每个连续行的奇偶校验向量来构建所述奇偶校验矩阵，其中所述奇偶校验向量是从所述组中剩余的有序非零奇偶校验向量中选择的。

公开(公告)号：US08358986B2

公开(公告)日：2013-01-22

申请号：US12051224

申请日：2008-03-19

申请人： Binita Gupta ,  Linbo Li ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

发明人： Binita Gupta ,  Linbo Li ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

IPC分类号： H04B1/18

CPC分类号： H04W72/04 ,  H04W72/005

摘要： Methods and apparatus for RF channel selection in a multi-frequency network. A method includes identifying selected local operations infrastructures (LOIs) and their neighboring LOIs, generating a neighbor description message (NDM) that identifies the selected LOIs and their neighboring LOIs and associates a descrambling sequence identifier with each RF channel of the selected LOIs and their neighboring LOIs, and distributing the NDM over the selected LOIs. An apparatus includes a message decoder to receive an NDM that identifies RF channels of a first LOI and neighboring LOIs, and wherein each RF channel is associated with a descrambling sequence identifier, and processing logic to detect content acquisition failures, determine a list of RF channels and their associated LOIs that carry desired content, and select a selected RF channel that is associated with a selected LOI that carries the most additional content among the associated LOIs.

摘要翻译： 用于多频网络中RF信道选择的方法和装置。 一种方法包括识别所选择的本地操作基础设施（LOI）及其相邻的LOI，生成识别所选择的LOI及其邻近LOI的邻居描述消息（NDM），并将解扰序列标识符与所选择的LOI的每个RF信道及其相邻的 LOI，并在所选LOI上分发NDM。 一种装置包括：消息解码器，用于接收标识第一LOI和相邻LOI的RF信道的NDM，并且其中每个RF信道与解扰序列标识符相关联，以及用于检测内容获取失败的处理逻辑，确定RF信道列表 以及它们相关联的LOI，其携带期望的内容，并且选择与所关联的LOI中携带最多附加内容的所选LOI相关联的所选RF信道。

公开(公告)号：US20100246564A1

公开(公告)日：2010-09-30

申请号：US12644856

申请日：2009-12-22

申请人： Bojan Vrcelj ,  Krishna K. Mukkavilli ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

发明人： Bojan Vrcelj ,  Krishna K. Mukkavilli ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

IPC分类号： H04J3/06 ,  H04L27/28

CPC分类号： H04L27/2662 ,  H04L25/0212 ,  H04L25/0216 ,  H04L27/2695

摘要： The embodiments provide mechanisms for synchronizing a receiver with OFDM pilots that are robust in the presence of channel fading conditions. In addition to using instantaneous channel estimate values to locate the first arriving path and last arriving path, the methods calculate time-domain averaged channel estimate values and use those averaged values to determine an average first arriving path and last arriving path. A combination of the instantaneous first arriving path and last arriving path and the average first arriving path and last arriving path may then be used to determine the delay spread and calculate a timing offset to be applied in timing synchronization. The various embodiments introduce improvements under channel fading conditions. Time-domain averaging may be embodied in a flexible DSP processor, or implemented in hardware and/or software. Using both instantaneous and time-averaged channel estimates greatly improves the robustness of time synchronization under channel fading conditions.

摘要翻译： 实施例提供了用于使接收机与存在信道衰落条件时鲁棒的OFDM导频同步的机制。 除了使用瞬时信道估计值来定位第一到达路径和最后到达路径之外，该方法还计算时域平均信道估计值，并使用这些平均值来确定平均第一到达路径和最后到达路径。 然后可以使用瞬时第一到达路径和最后到达路径以及平均第一到达路径和最后到达路径的组合来确定延迟扩展，并计算要在定时同步中应用的定时偏移。 各种实施例在信道衰落条件下引入改进。 时域平均可以体现在灵活的DSP处理器中，或者在硬件和/或软件中实现。 使用瞬时和时间平均信道估计大大提高了信道衰落条件下时间同步的鲁棒性。

公开(公告)号：US20080261547A1

公开(公告)日：2008-10-23

申请号：US12051224

申请日：2008-03-19

申请人： Binita Gupta ,  Linbo Li ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

发明人： Binita Gupta ,  Linbo Li ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

IPC分类号： H04B1/18

CPC分类号： H04W72/04 ,  H04W72/005

摘要： Methods and apparatus for RF channel selection in a multi-frequency network. A method includes identifying selected local operations infrastructures (LOIs) and their neighboring LOIs, generating a neighbor description message (NDM) that identifies the selected LOIs and their neighboring LOIs and associates a descrambling sequence identifier with each RF channel of the selected LOIs and their neighboring LOIs, and distributing the NDM over the selected LOIs. An apparatus includes a message decoder to receive an NDM that identifies RF channels of a first LOI and neighboring LOIs, and wherein each RF channel is associated with a descrambling sequence identifier, and processing logic to detect content acquisition failures, determine a list of RF channels and their associated LOIs that carry desired content, and select a selected RF channel that is associated with a selected LOI that carries the most additional content among the associated LOIs.

摘要翻译： 用于多频网络中RF信道选择的方法和装置。 一种方法包括识别所选择的本地操作基础设施（LOI）及其相邻的LOI，生成识别所选择的LOI及其邻近LOI的邻居描述消息（NDM），并将解扰序列标识符与所选择的LOI的每个RF信道及其相邻的 LOI，并在所选LOI上分发NDM。 一种装置包括：消息解码器，用于接收标识第一LOI和相邻LOI的RF信道的NDM，并且其中每个RF信道与解扰序列标识符相关联，以及用于检测内容获取失败的处理逻辑，确定RF信道列表 以及它们相关联的LOI，其携带期望的内容，并且选择与所关联的LOI中携带最多附加内容的所选LOI相关联的所选RF信道。

公开(公告)号：US20080253331A1

公开(公告)日：2008-10-16

申请号：US12051758

申请日：2008-03-19

申请人： Binita Gupta ,  Linbo Li ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

发明人： Binita Gupta ,  Linbo Li ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

IPC分类号： H04Q7/00

CPC分类号： H04W36/30 ,  H04W36/0055 ,  H04W72/005

摘要： Methods and apparatus for RF handoff in a multi-frequency network. A method includes generating seamless and partially seamless handoff tables for multiplexes carried in a current LOI, wherein the seamless and partially seamless handoff tables comprise neighboring RF channels carrying one or more of the multiplexes in the current LOI, detecting a handoff event initiated by acquisition failures on a current RF, selecting a selected RF channel from the seamless and partially seamless handoff tables, and performing a handoff to the selected RF channel. An apparatus includes processing logic configured to generate the seamless and partially seamless handoff tables, detect a handoff event initiated by acquisition failures on a current RF, and select a selected RF channel from the seamless and partially seamless handoff tables. The apparatus also includes channel switch logic configured to perform a handoff to the selected RF channel.

摘要翻译： 多频网络中RF切换的方法和装置。 一种方法包括为当前LOI中携带的多路复用产生无缝和部分无缝切换表，其中无缝和部分无缝切换表包括在当前LOI中携带一个或多个多路复用的相邻RF信道，检测由采集失败发起的切换事件 在当前RF上，从无缝和部分无缝切换表中选择所选择的RF信道，以及对所选择的RF信道执行切换。 一种装置包括处理逻辑，其被配置为生成无缝和部分无缝切换表，检测由当前RF获取故障引发的切换事件，以及从无缝和部分无缝切换表中选择所选择的RF信道。 该装置还包括被配置为执行到所选择的RF信道的切换的信道切换逻辑。

公开(公告)号：US09042461B2

公开(公告)日：2015-05-26

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： H04N7/18 ,  H04L27/26

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：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：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。