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    Time tracking for a communication system
    2.
    发明申请
    Time tracking for a communication system 有权
    通讯系统的时间跟踪

    公开(公告)号：US20060233097A1

    公开(公告)日：2006-10-19

    申请号：US11371536

    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 characterizing a communication channel is disclosed. A detection window is moved through a channel profile to accumulate tap energies in the channel profile within the detection window into an accumulated energy curve. A peak at a maximum in the accumulated energy curve is determined. A band relative to the accumulated energy curve is defined. A first arriving path (FAP) is determined using a trailing edge found near a second end of a zone in the accumulated energy curve. A leading edge is found near a first end of the zone of the accumulated energy curve. The last arriving path (LAP) is determined using the leading edge. The band defines a zone of the accumulated energy curve at or near the maximum that is within the band.

    摘要翻译： 公开了一种用于表征通信信道的方法。 检测窗口通过通道轮廓移动，以将检测窗口内的通道轮廓中的抽头能量累积为累积的能量曲线。 确定累积能量曲线中最大值的峰值。 定义相对于累积能量曲线的带。 使用在累积能量曲线中的区域的第二端附近发现的后沿来确定第一到达路径（FAP）。 在累积能量曲线的区域的第一端附近发现前沿。 最后到达路径（LAP）使用前沿确定。 频带定义在频带内或附近的最大值处的累积能量曲线的区域。

    Trend influenced time tracking
    3.
    发明申请
    Trend influenced time tracking 有权
    趋势影响时间跟踪

    公开(公告)号：US20060215539A1

    公开(公告)日：2006-09-28

    申请号：US11371535

    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 ,  H04Q7/00 ,  H04Q7/20

    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 determining a communication channel location is disclosed. A first subset of a plurality of channel impulse responses is averaged over a first time period to produce a first filtered channel impulse response, and a second subset of the plurality of channel impulse responses is averaged over a second time period to produce a second filtered channel impulse response. The second time period is different from the first time period, and the second subset is different from the first subset. The communication channel location is determined using the first filtered channel impulse response and the second filtered channel impulse response.

    摘要翻译： 公开了一种用于确定通信信道位置的方法。 多个信道脉冲响应的第一子集在第一时间段内被平均以产生第一经滤波的信道脉冲响应，并且在第二时间周期上平均多个信道脉冲响应的第二子集，以产生第二滤波信道 脉冲响应。 第二时间段与第一时间段不同，第二子集与第一子集不同。 使用第一滤波信道脉冲响应和第二滤波信道脉冲响应来确定通信信道位置。

    Apparatus and methods for timing recovery in a wireless transceiver
    4.
    发明申请
    Apparatus and methods for timing recovery in a wireless transceiver 有权
    无线收发器中定时恢复的装置和方法

    公开(公告)号：US20070140322A1

    公开(公告)日：2007-06-21

    申请号：US11303589

    申请日：2005-12-15

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

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

    IPC分类号： H04B1/00

    CPC分类号： H04L27/2656 ,  H04L27/261 ,  H04L27/2675

    摘要： Apparatus and methods for use in a wireless communication system are disclosed for recovery of timing tracking in a device, such as a wireless transceiver, after decoding errors occur due to incorrect timing tracking. In particular, the disclosed methods and apparatus recover timing tracking by monitoring a decoded signal in the transceiver for decoding errors occurring during a first frame, determining whether a number of decoding errors is greater than a predetermined amount, reacquiring a first pilot channel at a start of a subsequently received second frame when the number of decoding errors is determined to be greater than the predetermined amount, and resetting timing tracking of the transceiver based on the reacquired first pilot channel.

    摘要翻译： 在无线通信系统中使用的装置和方法被公开用于在诸如无线收发器的设备中恢复定时跟踪，在由于不正确的定时跟踪而导致解码错误之后。 具体地，所公开的方法和装置通过监视收发器中的解码信号来恢复定时跟踪，以解码在第一帧期间发生的错误，确定解码错误的数量是否大于预定量，在开始时重新获取第一导频信道 当确定解码错误的数量大于预定量时，随后接收到的第二帧，并且基于重新获取的第一导频信道来重置收发信机的定时跟踪。

    Collection window positioning using time tracking information
    5.
    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。

    Wide area and local network ID transmission for communication systems
    6.
    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 determining timing in a wireless communication system
    8.
    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定时的方法和装置

    公开(公告)号：US20070098125A1

    公开(公告)日：2007-05-03

    申请号：US11264532

    申请日：2005-10-31

    申请人： Bojan Vrcelj ,  Fuyun Ling ,  Michael Wang

    发明人： Bojan Vrcelj ,  Fuyun Ling ,  Michael Wang

    IPC分类号： 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。