Timing corrections in a multi carrier system and propagation to a channel estimation time filter
    1.
    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。

    Methods and apparatus for timing synchronization based on transitional pilot symbols
    6.
    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

    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。

    METHODS AND APPARATUS FOR TIME TRACKING USING ASSITANCE FROM TDM PILOTS IN A COMMUNICATION NETWORK
    8.
    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

    IPC分类号: H04J3/14 H04L12/26

    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。