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    Timing corrections in a multi carrier system and propagation to a channel estimation time filter
    2.
    发明授权
    Timing corrections in a multi carrier system and propagation to a channel estimation time filter 有权
    多载波系统中的定时校正和传播到信道估计时间滤波器

    公开(公告)号：US08428001B2

    公开(公告)日：2013-04-23

    申请号：US11373764

    申请日：2006-03-09

    申请人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli

    发明人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli

    IPC分类号： H04B7/212

    CPC分类号： H04L25/0232 ,  H04L25/0212 ,  H04L25/0224 ,  H04L25/025 ,  H04L27/2662 ,  H04L27/2665

    摘要： Systems and methods are provided for determining and applying timing corrections in a digital communications system. In an aspect, a timing correction method is provided for a multi-carrier system. This includes aligning two or more symbols with respect to each other from a symbol subset in order to account for timing differences between the symbols. The symbol alignment is first carried out to generate channel estimates for data demodulation. The channel estimates, thus generated, along with the timing alignment information are in turn used for determining timing corrections-to be applied to future symbols.

    摘要翻译： 提供了用于在数字通信系统中确定和应用定时校正的系统和方法。 在一方面，为多载波系统提供定时校正方法。 这包括从符号子集彼此对准两个或更多个符号，以便考虑符号之间的时序差异。 首先执行符号对齐以产生用于数据解调的信道估计。 由此生成的信道估计以及定时对准信息又用于确定定时校正，以应用于将来的符号。

    METHODS AND APPARATUS FOR TIME TRACKING USING ASSITANCE FROM TDM PILOTS IN A COMMUNICATION NETWORK
    4.
    发明申请
    METHODS AND APPARATUS FOR TIME TRACKING USING ASSITANCE FROM TDM PILOTS IN A COMMUNICATION NETWORK 有权
    在通信网络中使用TDM PILOTS的资产进行时间跟踪的方法和装置

    公开(公告)号：US20110116396A1

    公开(公告)日：2011-05-19

    申请号：US12917789

    申请日：2010-11-02

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

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

    IPC分类号： H04J3/14 ,  H04L12/26

    CPC分类号： H04L27/2662 ,  H04L25/0216 ,  H04L25/0224 ,  H04L27/2675 ,  H04L27/2695

    摘要： Methods and apparatus for time tracking using assistance from TDM pilots in a communication network. In an aspect, a method is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The method includes determining a delay spread, and modifying at least one parameter used by the time tracking algorithm based on the delay spread. In another aspect, an apparatus is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The apparatus includes computation logic for determining a delay spread, and control logic for modifying at least one parameter used by the time tracking algorithm based on the delay spread.

    摘要翻译： 在通信网络中使用TDM导频协助进行时间跟踪的方法和装置。 在一方面，提供了一种用于在通信网络上操作的设备中进行时间跟踪的方法，其中该设备执行时间跟踪算法。 该方法包括确定延迟扩展，以及基于延迟扩展修改由时间跟踪算法使用的至少一个参数。 在另一方面，提供了一种用于在通信网络上操作的设备中进行时间跟踪的设备，其中该设备执行时间跟踪算法。 该装置包括用于确定延迟扩展的计算逻辑，以及用于基于延迟扩展修改由时间跟踪算法使用的至少一个参数的控制逻辑。

    METHODS AND APPARATUS FOR DETERMINING TIMING IN A WIRELESS COMMUNICATION SYSTEM
    7.
    发明申请
    METHODS AND APPARATUS FOR DETERMINING TIMING IN A WIRELESS COMMUNICATION SYSTEM 失效
    用于确定无线通信系统中的时序的方法和装置

    公开(公告)号：US20100034242A1

    公开(公告)日：2010-02-11

    申请号：US12579131

    申请日：2009-10-14

    申请人： BOJAN VRCELJ ,  Fuyun Ling ,  Michael Mao Wang

    发明人： BOJAN VRCELJ ,  Fuyun Ling ,  Michael Mao Wang

    IPC分类号： H04B1/38 ,  H04L7/00

    CPC分类号： H04L27/2662 ,  H04L27/2676

    摘要： Methods and apparatus for setting timing of sampling of one or more symbols. The disclosed methods account for at least three types of effective interference (EI) and are used to set the timing of a sampling window for sampling received symbols. The methods includes setting timing based on determining an energy density function accounting for both static and dynamic EI, determining the minimum of a total energy profile and sliding the sampling window to ensure that the minimum point is at a predetermined point, and determining and using a composite energy profile accounting for short term and long term fading effects. The disclosed apparatus include a transceiver employing one or more of the disclosed methods for setting timing when receiving the symbols.

    摘要翻译： 用于设置一个或多个符号的采样定时的方法和装置。 所公开的方法至少有三种类型的有效干扰（EI），并且用于设置用于采样接收符号的采样窗口的定时。 所述方法包括基于确定静态和动态EI两者的能量密度函数来设定定时，确定总能量分布的最小值，并滑动采样窗口以确保最小点在预定点，以及确定和使用 复合能量曲线描述短期和长期衰落影响。 所公开的装置包括采用一种或多种所述方法的收发机，用于在接收符号时设置定时。

    METHODS AND APPARATUS FOR TIMING SYNCHRONIZATION BASED ON TRANSITIONAL PILOT SYMBOLS
    8.
    发明申请
    METHODS AND APPARATUS FOR TIMING SYNCHRONIZATION BASED ON TRANSITIONAL PILOT SYMBOLS 有权
    基于过渡引导符号的时序同步的方法与装置

    公开(公告)号：US20080165908A1

    公开(公告)日：2008-07-10

    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： H04L7/00

    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。

    Wide area and local network ID transmission for communication systems
    9.
    发明申请
    Wide area and local network ID transmission for communication systems 有权
    通信系统的广域和本地网络ID传输

    公开(公告)号：US20060133388A1

    公开(公告)日：2006-06-22

    申请号：US11021310

    申请日：2004-12-22

    申请人： Michael Wang ,  Bojan Vrcelj ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

    发明人： Michael Wang ,  Bojan Vrcelj ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

    IPC分类号： H04L12/56

    CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0083 ,  H04L27/261

    摘要： The embodiments utilize OFDM symbols to communicate network IDs. The IDs are encoded into symbols utilizing the network IDs as seeds to scramble respective pilots that are then transmitted by utilizing the symbols. The pilots can be structured into a single OFDM symbol and/or multiple OFDM symbols. The single symbol structure for transmitting the network IDs is independent of the number of network ID bits and minimizes frequency offset and Doppler effects. The multiple symbol structure allows a much coarser timing accuracy to be employed at the expense of transmitting additional symbols. Several embodiments employ a search function to find possible network ID candidates from a transmitted symbol and a selection function to find an optimum candidate from a network ID candidate list.

    摘要翻译： 这些实施例利用OFDM符号来传送网络ID。 ID被编码成使用网络ID作为种子的符号，以对通过利用符号进行发送的各个导频进行加扰。 导频可以被构造成单个OFDM符号和/或多个OFDM符号。 用于发送网络ID的单个符号结构与网络ID比特数无关，并且使频偏和多普勒效应最小化。 多符号结构允许以牺牲传输附加符号为代价采用更粗糙的定时精度。 几个实施例采用搜索功能来从发送的符号和选择功能中找到可能的网络ID候选，以从网络ID候选列表中找到最佳候选。

    Methods and apparatus for timing synchronization based on transitional pilot symbols
    10.
    发明授权
    Methods and apparatus for timing synchronization based on transitional pilot symbols 有权
    基于过渡导频符号的定时同步的方法和装置

    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。