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    Timing corrections in a multi carrier system and propagation to a channel estimation time filter
    3.
    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

    申请人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli

    发明人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli

    IPC分类号： H04B7/212

    CPC分类号： H04L25/0232 ,  H04L25/0212 ,  H04L25/0224 ,  H04L25/025 ,  H04L27/2662 ,  H04L27/2665

    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。

    Adaptive time-filtering for channel estimation in OFDM system
    7.
    发明授权
    Adaptive time-filtering for channel estimation in OFDM system 有权
    OFDM系统中信道估计的自适应时间滤波

    公开(公告)号：US07848463B2

    公开(公告)日：2010-12-07

    申请号：US11248976

    申请日：2005-10-11

    申请人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli

    发明人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli

    IPC分类号： H04L27/06

    CPC分类号： H04L25/0232 ,  H04L25/022

    摘要： Time filtering channel estimates in a wireless communication system, such as an Orthogonal Frequency Division Multiplex (OFDM) system, can be used to improve the quality of channel estimates. The characteristics of an optimal channel estimate time filter can depend on the manner in which the channel estimate is determined as well as the time correlation of channel estimates. A receiver can implement an adaptive time filter for channel estimates in which the time filter response can vary based on channel estimate parameters. The channel estimate parameters can include the manner of determining channel estimates, a time correlation of channel estimates, and an estimated Doppler frequency. The time filter response can be varied continuously over a range of responses or can be varied discretely over a predetermined number of time filter responses.

    摘要翻译： 在诸如正交频分复用（OFDM）系统的无线通信系统中的时间滤波信道估计可以用于提高信道估计的质量。 最优信道估计时间滤波器的特征可以取决于信道估计的方式以及信道估计的时间相关性。 接收机可以实现用于信道估计的自适应时间滤波器，其中时间滤波器响应可以基于信道估计参数而变化。 信道估计参数可以包括确定信道估计的方式，信道估计的时间相关性和估计的多普勒频率。 时间滤波器响应可以在响应范围内连续变化，或者可以在预定数量的时间滤波器响应上离散变化。

    Methods and apparatus for signal and interference energy estimation in a communication system
    10.
    发明授权
    Methods and apparatus for signal and interference energy estimation in a communication system 有权
    通信系统中信号和干扰能量估计的方法和装置

    公开(公告)号：US08229708B2

    公开(公告)日：2012-07-24

    申请号：US11563627

    申请日：2006-11-27

    申请人： Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi

    发明人： Ashok Mantravadi ,  Fuyun Ling ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi

    IPC分类号： G01R15/00 ,  G01R21/00 ,  H04B15/00 ,  H04B1/10 ,  H04B3/46 ,  H04B1/00 ,  H04B17/00 ,  H04B1/04 ,  H04B1/12 ,  H04L25/08

    CPC分类号： H04B1/1027

    摘要： Methods and apparatus for signal and interference energy estimation in a communication system. In an aspect, a method includes setting a threshold value, and comparing a channel estimate to the threshold value to determine an interference estimate (Iest). The method also includes averaging the interference estimate (Iest) to determine average channel interference (Ic), and determining interference energy (I) based on the interference estimate (Iest) and the average channel interference (Ic). In another aspect, an apparatus includes threshold logic configured to set a threshold value and compare a channel estimate to the threshold value to determine an interference estimate (Iest). The apparatus includes averaging logic configured to average the interference estimate (Iest) to determine average channel interference (Ic), and summing logic configured to determine interference energy (I) based on the interference estimate (Iest) and average channel interference (Ic).

    摘要翻译： 通信系统中信号和干扰能量估计的方法和装置。 一方面，一种方法包括设置阈值，以及将信道估计与阈值进行比较以确定干扰估计（Iest）。 该方法还包括对干扰估计（Iest）进行平均以确定平均信道干扰（Ic），以及基于干扰估计（Iest）和平均信道干扰（Ic）来确定干扰能量（I）。 在另一方面，一种装置包括阈值逻辑，其被配置为设置阈值并将信道估计与阈值进行比较以确定干扰估计（Iest）。 该装置包括被配置为平均干扰估计（Iest）以确定平均信道干扰（Ic）的平均逻辑，以及被配置为基于干扰估计（Iest）和平均信道干扰（Ic））来确定干扰能量（I）的求和逻辑。