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    METHODS AND SYSTEMS FOR IMPROVED TIMING ACQUISITION FOR VARYING CHANNEL CONDITIONS
    2.
    发明申请
    METHODS AND SYSTEMS FOR IMPROVED TIMING ACQUISITION FOR VARYING CHANNEL CONDITIONS 审中-公开
    改进通道条件改进时间采集的方法和系统

    公开(公告)号：US20100157833A1

    公开(公告)日：2010-06-24

    申请号：US12644909

    申请日：2009-12-22

    申请人： BOJAN VRCELJ ,  Krishna K. Mukkavilli ,  Raghuraman Krishnamoorthi ,  Vinay Murthy

    发明人： BOJAN VRCELJ ,  Krishna K. Mukkavilli ,  Raghuraman Krishnamoorthi ,  Vinay Murthy

    IPC分类号： H04L12/26

    CPC分类号： H04L27/2675 ,  H04L5/0048 ,  H04L7/08 ,  H04L27/2626 ,  H04L27/2665 ,  H04L27/2688 ,  H04L27/2692 ,  H04L27/2695

    摘要： An improved receiver apparatus and acquisition algorithm using TDM pilots is disclosed. The timing acquisition method presented provides capabilities for adapting to changing channel conditions, in particular varying expected delay spreads. The information on an expected delay spread can be fed back to the initial acquisition algorithm based on previous successful attempts, and the delay spreads measured at that time, such as to set the length of the detection window used to in the TDM pilot processing. Based on the delay spread information, the algorithm for processing the specialized TDM pilot can adaptively modify the timing acquisition parameters for more robust performance under interference conditions. This may involve reducing the length of the detection window to just a little more than or equal to the maximum expected delay spread, which reduces sensitivity of the fine timing acquisition to signal noise.

    摘要翻译： 公开了一种使用TDM导频的改进的接收机设备和采集算法。 提出的定时获取方法提供了适应不断变化的信道条件，特别是改变预期延迟传播的能力。 关于期望延迟扩展的信息可以基于先前的成功尝试反馈到初始捕获算法，并且在那时测量的延迟扩展，例如设置在TDM导频处理中使用的检测窗口的长度。 基于延迟扩展信息，用于处理专用TDM导频的算法可以自适应地修改定时获取参数，以在干扰条件下实现更强的性能。 这可能涉及将检测窗口的长度减小到大于或等于最大预期延迟扩展的一点，这降低了精确定时采集对信号噪声的灵敏度。

    Methods and systems for timing acquisition robust to channel fading
    6.
    发明授权
    Methods and systems for timing acquisition robust to channel fading 有权
    定时采集的方法和系统对信道衰落具有鲁棒性

    公开(公告)号：US08249116B2

    公开(公告)日：2012-08-21

    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 ,  H04J3/00 ,  H04B7/212

    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在存在信道衰落条件的情况下鲁棒的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。

    EXTRACTING INFORMATION FROM POSITIONING PILOT CHANNEL SYMBOLS IN FORWARD LINK ONLY SYSTEM
    7.
    发明申请
    EXTRACTING INFORMATION FROM POSITIONING PILOT CHANNEL SYMBOLS IN FORWARD LINK ONLY SYSTEM 审中-公开
    从前进链接系统中的定位导频信号提取信息

    公开(公告)号：US20100158160A1

    公开(公告)日：2010-06-24

    申请号：US12643664

    申请日：2009-12-21

    申请人： KRISHNA K. MUKKAVILLI ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

    发明人： KRISHNA K. MUKKAVILLI ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

    IPC分类号： H04L27/06

    CPC分类号： H04L27/2647 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/023

    摘要： Methods, systems, and apparatus, including computer programs encoded on computer readable storage media, for extracting transmitter identification information from the Positioning Pilot Channel (PPC) of a MediaFLO superframe. One of a wide area differentiator (WID) value and a local area differentiator (LID) value associated with the transmitter is determined based on signaling in a first interlace of a symbol received via the PPC. A time domain channel estimate is computed for the PPC based on signaling in a plurality of interlaces of the symbol and also based on the one of the WID and LID values. The time domain channel estimate is used to obtain a frequency domain channel estimate for a second interlace of the symbol that carries the transmitter identification information, and the frequency domain channel estimate is used to determine the transmitter identification information.

    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，用于从MediaFLO超帧的定位导频信道（PPC）提取发射机识别信息。 基于经由PPC接收的符号的第一交错中的信令来确定与发送器相关联的广域微分器（WID）值和局部区域微分器（LID）值之一。 基于符号的多个交织中的信令，并且还基于WID和LID值中的一个来计算PPC的时域信道估计。 使用时域信道估计来获得携带发射机识别信息的符号的第二交错的频域信道估计，并且使用频域信道估计来确定发射机识别信息。

    SYSTEM AND METHOD FOR SIGNALING OVERHEAD INFORMATION IN A NETWORK
    9.
    发明申请
    SYSTEM AND METHOD FOR SIGNALING OVERHEAD INFORMATION IN A NETWORK 审中-公开
    用于信号在网络中信号的系统和方法

    公开(公告)号：US20110216745A1

    公开(公告)日：2011-09-08

    申请号：US12876958

    申请日：2010-09-07

    申请人： Fuyun Ling ,  Krishna K. Mukkavilli ,  Ralph A. Gholmieh ,  Bojan Vrcelj

    发明人： Fuyun Ling ,  Krishna K. Mukkavilli ,  Ralph A. Gholmieh ,  Bojan Vrcelj

    IPC分类号： H04W72/04 ,  H04W88/00

    CPC分类号： H04H60/73 ,  H04H20/30 ,  H04H40/18

    摘要： A system for signaling overhead information in a network includes a receiver configured to receive a radio frequency communication signal comprising at least one superframe, the at least one superframe comprising overhead information that identifies a location of a first data stream carried in the at least one superframe, and a trailer associated with the first data stream, the trailer including at least a portion of the overhead information that identifies the location of the first data stream in a subsequent superframe without the receiver processing the overhead information in the subsequent superframe.

    摘要翻译： 用于信令网络中的开销信息的系统包括：接收机，被配置为接收包括至少一个超帧的射频通信信号，所述至少一个超帧包括开销信息，所述开销信息标识在所述至少一个超帧中携带的第一数据流的位置 以及与所述第一数据流相关联的预告片，所述预告片包括在后续超帧中标识所述第一数据流的位置的所述开销信息的至少一部分，而所述接收器处理所述后续超帧中的开销信息。