Trend influenced time tracking
    5.
    发明授权
    Trend influenced time tracking 有权
    趋势影响时间跟踪

    公开(公告)号:US08144824B2

    公开(公告)日:2012-03-27

    申请号:US11371535

    申请日:2006-03-08

    IPC分类号: H04B1/10

    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。

    Time tracking for a communication system
    6.
    发明授权
    Time tracking for a communication system 有权
    通讯系统的时间跟踪

    公开(公告)号:US08165167B2

    公开(公告)日:2012-04-24

    申请号:US11371536

    申请日:2006-03-08

    IPC分类号: H04J11/00 H04L7/00

    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。

    Collection window positioning using time tracking information
    7.
    发明授权
    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:US08175123B2

    公开(公告)日:2012-05-08

    申请号:US11371837

    申请日:2006-03-08

    IPC分类号: H04J3/08

    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。

    Timing corrections in a multi carrier system and propagation to a channel estimation time filter
    9.
    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

    IPC分类号: H04B7/212

    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。