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：US20120054585A1

公开(公告)日：2012-03-01

申请号：US12869555

申请日：2010-08-26

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

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

IPC分类号： H03M13/19 ,  G06F11/10

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：US20060250937A1

公开(公告)日：2006-11-09

申请号：US11372930

申请日：2006-03-09

申请人： Michael Wang ,  Bojan Vrcelj ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

发明人： Michael Wang ,  Bojan Vrcelj ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

IPC分类号： H04J11/00

CPC分类号： H04L27/2613 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/023

摘要： Systems and methods are provided for the transmission of waveforms to aid channel estimation, timing synchronization, and AGC bootstrapping in a wireless network. The method includes inserting at least one TDM pilot symbol located at a transition between wide area and local area waveforms to facilitate decoding of the transmission block.

公开(公告)号：US20050163258A1

公开(公告)日：2005-07-28

申请号：US11022513

申请日：2004-12-22

申请人： Dhananjay Gore ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi

发明人： Dhananjay Gore ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi

IPC分类号： H04L25/02 ,  H04L27/26 ,  H04B1/10

CPC分类号： H04L25/0224 ,  H04L25/0212 ,  H04L25/022

摘要： Pilot transmission and channel estimation techniques for an OFDM system with excess delay spread are described. To mitigate the deleterious effects of excess delay spread, time filtering is utilized. Time filtering is utilized to combat excess delay spread effects in channel estimation. The time filtering is performed in the presence of staggered pilots and helps in improving the channel estimate in the presence of excess delay spread.

摘要翻译： 描述了具有超延迟扩展的OFDM系统的导频传输和信道估计技术。 为了减轻多余延迟扩展的有害影响，利用时间滤波。 利用时间滤波来对付信道估计中的多余延迟扩散效应。 在存在交错导频的情况下执行时间滤波，并有助于在存在超延迟扩展的情况下改善信道估计。

公开(公告)号：US20070211765A1

公开(公告)日：2007-09-13

申请号：US11373607

申请日：2006-03-09

申请人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi ,  Michael Wang

发明人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi ,  Michael Wang

IPC分类号： H04J3/06

CPC分类号： H04L27/2613 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/0216 ,  H04L25/0226 ,  H04L25/03866 ,  H04L27/2662 ,  H04L27/2675

摘要： Systems and methods are provided for channel estimation and timing synchronization in a wireless network. In an embodiment, a method is provided for time synchronization at a wireless receiver. The method includes decoding at least one TDM pilot symbol located at a transition between wide and local waveforms and processing the TDM pilot symbol to perform time synchronization for a wireless receiver. Methods for channel estimation at a wireless receiver are also provided. This includes decoding at least one TDM pilot symbol and receiving the TDM pilot symbol from an OFDM broadcast to facilitate channel estimation for a wireless receiver.

摘要翻译： 提供了系统和方法用于无线网络中的信道估计和定时同步。 在一个实施例中，提供了一种用于在无线接收机处进行时间同步的方法。 该方法包括解码位于宽和局部波形之间的转变处的至少一个TDM导频符号，并处理TDM导频符号以对无线接收机执行时间同步。 还提供了在无线接收机处进行信道估计的方法。 这包括解码至少一个TDM导频符号并从OFDM广播接收TDM导频符号以便于无线接收机的信道估计。

公开(公告)号：US08102756B2

公开(公告)日：2012-01-24

申请号：US11834669

申请日：2007-08-06

申请人： Krishna Kiran Mukkavilli ,  Ashok Mantravadi ,  Raghuraman Krishnamoorthi ,  Murali Ramaswamy Chari ,  Tao Tian

发明人： Krishna Kiran Mukkavilli ,  Ashok Mantravadi ,  Raghuraman Krishnamoorthi ,  Murali Ramaswamy Chari ,  Tao Tian

IPC分类号： H04J11/00 ,  H04Q7/00

CPC分类号： H04W48/16 ,  H04L27/2647

摘要： A method of acquiring a forward link only (FLO) network in a radio frequency (RF) in a wireless communication environment, includes selecting a RF from a first list; selecting a signal parameter (SP) from a second list; determining if a first parameter is found using the selected RF and SP; and, upon determination that the first parameter is found, enabling the use of the selected RF and SP to communicate in the FLO network. An apparatus for implementing the method is also disclosed.

摘要翻译： 一种在无线通信环境中在射频（RF）中获取前向链路（FLO）网络的方法，包括从第一列表中选择RF; 从第二列表中选择信号参数（SP）; 使用所选择的RF和SP确定是否发现第一参数; 并且在确定发现第一参数之后，使所选择的RF和SP能够在FLO网络中进行通信。 还公开了一种用于实现该方法的装置。

公开(公告)号：US20090028257A1

公开(公告)日：2009-01-29

申请号：US11834669

申请日：2007-08-06

申请人： Krishna Kiran Mukkavilli ,  Ashok Mantravadi ,  Raghuraman Krishnamoorthi ,  Murali Ramaswamy Chari ,  Tao Tian

发明人： Krishna Kiran Mukkavilli ,  Ashok Mantravadi ,  Raghuraman Krishnamoorthi ,  Murali Ramaswamy Chari ,  Tao Tian

IPC分类号： H04K1/10

CPC分类号： H04W48/16 ,  H04L27/2647

摘要： A method of acquiring a forward link only (FLO) network in a radio frequency (RF) in a wireless communication environment, includes selecting a RF from a first list; selecting a signal parameter (SP) from a second list; determining if a first parameter is found using the selected RF and SP; and, upon determination that the first parameter is found, enabling the use of the selected RF and SP to communicate in the FLO network. An apparatus for implementing the method is also disclosed.

摘要翻译： 一种在无线通信环境中在射频（RF）中获取前向链路（FLO）网络的方法，包括从第一列表中选择RF; 从第二列表中选择信号参数（SP）; 使用所选择的RF和SP确定是否发现第一参数; 并且在确定发现第一参数之后，使所选择的RF和SP能够在FLO网络中进行通信。 还公开了一种用于实现该方法的装置。

公开(公告)号：US09008198B2

公开(公告)日：2015-04-14

申请号：US11765428

申请日：2007-06-19

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

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

IPC分类号： H04K1/10 ,  H04L27/28 ,  H04L27/26 ,  H04L5/00 ,  H04L7/08 ,  H04L25/02

CPC分类号： H04L27/2662 ,  H04L5/0048 ,  H04L7/08 ,  H04L25/0216 ,  H04L25/023 ,  H04L27/2613 ,  H04L27/2675 ,  H04L27/2695

摘要： Methods and apparatus for timing synchronization based on transitional pilot symbols. In an aspect, a method is provided for time tracking synchronization in an OFDM system. The method includes receiving at least one TDM pilot symbol comprising a plurality of modulated sub-carriers that are configured to provide a channel estimate having a length that extends up to a duration of an FFT used for data transmission. The method also includes determining one or both of an instantaneous and averaged channel estimates from the plurality of modulated sub-carriers, and calculating a timing offset based on one or both of the channel estimates. An apparatus includes a receiver configured to receive the at least one TDM pilot symbol, a channel estimator configured to determine the instantaneous and averaged channel estimates, and a time synchronizer configured to calculate a timing offset based on the channel estimates.

摘要翻译： 基于过渡导频符号的定时同步的方法和装置。 在一方面，提供了一种用于OFDM系统中的时间跟踪同步的方法。 该方法包括：接收至少一个TDM导频符号，该TDM导频符号包括多个经调制的子载波，其被配置为提供具有延伸到用于数据传输的FFT的持续时间的长度的信道估计。 该方法还包括确定来自多个调制子载波的瞬时和平均信道估计中的一个或两个，以及基于信道估计中的一个或两个来计算定时偏移。 一种装置包括被配置为接收所述至少一个TDM导频符号的接收机，被配置为确定瞬时和平均信道估计的信道估计器，以及被配置为基于信道估计来计算定时偏移的时间同步器。

公开(公告)号：US08644214B2

公开(公告)日：2014-02-04

申请号：US12862740

申请日：2010-08-24

申请人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Michael Mao Wang

发明人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Michael Mao Wang

IPC分类号： H04B7/212

CPC分类号： H04L27/2613 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/0216 ,  H04L25/0226 ,  H04L25/03866 ,  H04L27/2662 ,  H04L27/2675

摘要： Systems and methods are provided for channel estimation and timing synchronization in a wireless network. In an embodiment, a method is provided for time synchronization at a wireless receiver. The method includes decoding at least one TDM pilot symbol located at a transition between wide and local waveforms and processing the TDM pilot symbol to perform time synchronization for a wireless receiver. Methods for channel estimation at a wireless receiver are also provided. This includes decoding at least one TDM pilot symbol and receiving the TDM pilot symbol from an OFDM broadcast to facilitate channel estimation for a wireless receiver.

摘要翻译： 提供了系统和方法用于无线网络中的信道估计和定时同步。 在一个实施例中，提供了一种用于在无线接收机处进行时间同步的方法。 该方法包括解码位于宽和局部波形之间的转变处的至少一个TDM导频符号，并处理TDM导频符号以对无线接收机执行时间同步。 还提供了在无线接收机处进行信道估计的方法。 这包括解码至少一个TDM导频符号并从OFDM广播接收TDM导频符号以便于无线接收机的信道估计。

公开(公告)号：US08432933B2

公开(公告)日：2013-04-30

申请号：US12896780

申请日：2010-10-01

申请人： Michael Mao Wang ,  Bojan Vrcelj ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

发明人： Michael Mao Wang ,  Bojan Vrcelj ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

IPC分类号： H04J3/00

CPC分类号： H04L27/2613 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/023

摘要： Systems and methods are provided for the transmission of waveforms to aid channel estimation, timing synchronization, and AGC bootstrapping in a wireless network. The method includes inserting at least one TDM pilot symbol located at a transition between wide area and local area waveforms to facilitate decoding of the transmission block.

摘要翻译： 提供了用于传输波形以辅助无线网络中的信道估计，定时同步和AGC自举的系统和方法。 该方法包括插入位于广域和局域波形之间的转变处的至少一个TDM导频符号，以便于传输块的解码。