利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

55 条记录 (耗时 0.013 秒)

    METHOD AND APPARATUS FOR ADAPTIVE TIMING SYNCHRONIZATION IN A COMMUNICATION NETWORK
    51.
    发明申请
    METHOD AND APPARATUS FOR ADAPTIVE TIMING SYNCHRONIZATION IN A COMMUNICATION NETWORK 失效
    用于通信网络中自适应时序同步的方法和装置

    公开(公告)号：US20100002817A1

    公开(公告)日：2010-01-07

    申请号：US12324818

    申请日：2008-11-26

    申请人： Bojan Vrcelj ,  Krishna Kiran Mukkavilli

    发明人： Bojan Vrcelj ,  Krishna Kiran Mukkavilli

    IPC分类号： H04L7/00

    CPC分类号： H04L25/0212 ,  H04L27/2662 ,  H04L27/2665

    摘要： An adaptive timing synchronization process dynamically adapts timing synchronization parameters for both wide and local area channels based on channel estimates. Timing synchronization parameters are dynamically adapted according to C/I estimates calculated from WID/LID energies. The timing synchronization algorithm 102 takes as the primary input, the current channel estimate 110 and produces an output comprising a correction to the current Fast Fourier Transform (FFT) sampling window position delta T (or offset) for locating the start of data within a current symbol 108. After dynamic parameter adjustment of noise filtering thresholds 104 and weak channel tap sensitivities 106 based on a calculated C/I from the channel estimate, a timing synchronization algorithm 102 locates the beginning of each continuous symbol by finding the boundary between the preamble, or cyclic prefix, and the useful data portions interlaced with pilots for channel information defining the start of a symbol 108.

    摘要翻译： 基于信道估计，自适应定时同步过程动态地适应广域和局域信道的定时同步参数。 定时同步参数根据从WID / LID能量计算的C / I估计动态调整。 定时同步算法102将当前信道估计110作为主要输入，并产生包括对当前快速傅立叶变换（FFT）采样窗位置增量T（或偏移）的校正的输出，用于定位当前数据的开始 基于来自信道估计的计算出的C / I，在噪声滤波阈值104和弱信道抽头灵敏度106的动态参数调整之后，定时同步算法102通过找到前导码之间的边界来定位每个连续符号的开始， 或循环前缀，并且有用数据部分与用于定义符号108的开始的信道信息的导频隔行扫描。

    Collection window positioning using time tracking information
    54.
    发明申请
    Collection window positioning using time tracking information 有权
    收集窗口定位使用时间跟踪信息

    公开(公告)号：US20060245349A1

    公开(公告)日：2006-11-02

    申请号：US11371837

    申请日：2006-03-08

    申请人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Rajiv Vijayan ,  Michael Wang

    发明人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Rajiv Vijayan ,  Michael Wang

    IPC分类号： H04J11/00

    CPC分类号： H04L27/2662 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0216 ,  H04L25/022 ,  H04L25/0228 ,  H04L27/261 ,  H04L27/265 ,  H04L27/2665 ,  H04L27/2679

    摘要： A method for positioning a collection window for a Fourier transform function is disclosed. A first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol are received. The first OFDM symbol comprises a plurality of frequency division multiplexed (FDM) symbols. The first OFDM symbol is characterized by at least two of the following: a delay spread, a first arriving path (FAP), or a last arriving path (LAP). A channel location is estimated from a channel impulse response. A point relative to the channel location is selected. A beginning of the collection window is positioned for the second OFDM symbol at the selected point. Alternatively, a point is selected at a first location relative to the channel location using a first algorithm if a delay spread is less than a predetermined length. The selected point is chosen at a second location relative to the channel location using a second algorithm if the delay spread is greater than the predetermined length.

    摘要翻译： 公开了一种用于定位用于傅立叶变换函数的收集窗口的方法。 接收第一正交频分复用（OFDM）符号和第二OFDM符号。 第一OFDM符号包括多个频分复用（FDM）符号。 第一OFDM符号的特征在于以下至少两个：延迟扩展，第一到达路径（FAP）或最后到达路径（LAP）。 从信道脉冲响应估计信道位置。 选择相对于通道位置的点。 收集窗口的开始位于所选点处的第二OFDM符号。 或者，如果延迟扩展小于预定长度，则使用第一算法在相对于信道位置的第一位置处选择点。 如果延迟扩展大于预定长度，则使用第二算法在相对于信道位置的第二位置处选择所选择的点。

    Fine timing acquisition
    55.
    发明申请
    Fine timing acquisition 审中-公开
    精细定时采集

    公开(公告)号：US20060221810A1

    公开(公告)日：2006-10-05

    申请号：US11372394

    申请日：2006-03-08

    申请人： Bojan Vrcelj ,  Fuyun Ling ,  Raghuraman Krishnamoorthi ,  Vinay Murthy

    发明人： Bojan Vrcelj ,  Fuyun Ling ,  Raghuraman Krishnamoorthi ,  Vinay Murthy

    IPC分类号： H04J11/00 ,  H04J3/06

    CPC分类号： H04L27/2656 ,  H04L27/2663 ,  H04L27/2665 ,  H04L27/2675 ,  H04L27/2695

    摘要： A method for synchronizing timing of a receiver to a received orthogonal frequency division multiplexing (OFDM) signal is disclosed. A first timing acquisition is performed with a first received time division multiplexed (TDM) pilot to determine a course timing estimate of the received OFDM signal. A second timing acquisition is performed with a second TDM pilot to determine a fine timing estimate for a OFDM symbol of the received OFDM signal. In the second timing acquisition, the accumulated energy of channel taps over a detection window is determined and a trailing edge of the accumulated energy curve is detected. A Fourier transform (FT) collection window location for subsequent OFDM symbols is adjusted according to the trailing edge information.

    摘要翻译： 公开了一种用于使接收机的定时与接收的正交频分复用（OFDM）信号同步的方法。 利用第一接收时分复用（TDM）导频执行第一定时获取，以确定所接收的OFDM信号的路线定时估计。 用第二TDM导频执行第二定时获取，以确定接收到的OFDM信号的OFDM符号的精确定时估计。 在第二定时获取中，确定在检测窗口上的通道抽头的累积能量，并且检测累积能量曲线的后沿。 根据后沿信息调整后续OFDM符号的傅立叶变换（FT）收集窗口位置。