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    • 11. 发明授权
    • Frame synchronization techniques
    • 帧同步技术
    • US08345533B1
    • 2013-01-01
    • US12540753
    • 2009-08-13
    • Qing ZhaoLeilei SongChuxiang Li
    • Qing ZhaoLeilei SongChuxiang Li
    • H04J11/00
    • H04W56/001H04L27/2613H04L27/2656
    • Frame synchronization techniques are described. In an implementation, a method implemented by a device includes using an objective function to form a list of values for a plurality of time trials, the time trials taken from a scan of a wireless signal having a plurality of channels. A single one of the values is selected for each of the plurality of channels to detect a preamble of a frame in the wireless signal. If the preamble is not detected as a result of the selecting, at least one additional value is chosen from the list for a respective channel to detect the preamble of the frame in the wireless signal.
    • 描述帧同步技术。 在实现中,由设备实现的方法包括使用目标函数来形成用于多个时间试验的值的列表,从具有多个信道的无线信号的扫描获取的时间试验。 为多个信道中的每一个选择值中的单个值以检测无线信号中的帧的前导码。 如果作为选择的结果没有检测到前同步码,则从列表中选择至少一个附加值以用于相应的信道以检测无线信号中的帧的前导码。
    • 12. 发明授权
    • Systems and methods for calibrating digital baseband DC offset in an OFDM receiver
    • 用于在OFDM接收机中校准数字基带DC偏移的系统和方法
    • US08279955B1
    • 2012-10-02
    • US12353391
    • 2009-01-14
    • Qing ZhaoSouvik DihidarLeilei SongJungwon Lee
    • Qing ZhaoSouvik DihidarLeilei SongJungwon Lee
    • H04K1/10
    • H04L27/2647H04L25/06
    • In accordance with the teachings described herein, systems and methods are provided for calibrating DC offset in a receiver. A DC calibration circuit may be used that is configured to receive a digital multi-carrier modulated (MCM) signal that includes a sequence of MCM symbols. The DC calibration circuit may include an accumulator and a compensator. The accumulator may be used to determine an estimated DC offset of a current MCM symbol in the sequence of MCM symbols. The compensator may be used to remove the estimated DC offset from a next MCM symbol in the sequence of MCM symbols. The accumulator may also be used to receive a plurality of digital samples that comprise the current MCM symbol and to determine the estimated DC offset by calculating an average of the plurality of digital samples.
    • 根据本文所述的教导,提供了用于校准接收机中的DC偏移的系统和方法。 可以使用DC校准电路,其被配置为接收包括MCM符号序列的数字多载波调制(MCM)信号。 DC校准电路可以包括蓄电池和补偿器。 可以使用累加器来确定MCM符号序列中的当前MCM符号的估计DC偏移。 补偿器可以用于从MCM符号序列中的下一个MCM符号中去除估计的DC偏移。 累加器还可以用于接收包括当前MCM符号的多个数字样本,并且通过计算多个数字样本的平均值来确定估计的DC偏移。
    • 16. 发明授权
    • Method and system for data synchronization in communication systems using repetitive preamble patterns
    • 使用重复前导码模式的通信系统中数据同步的方法和系统
    • US08964789B1
    • 2015-02-24
    • US12609862
    • 2009-10-30
    • Jungwon LeeJiwoong ChoiQing ZhaoHui-Ling Lou
    • Jungwon LeeJiwoong ChoiQing ZhaoHui-Ling Lou
    • H04J3/06
    • H04L27/2643H04L7/042H04L27/2613H04L27/2656H04L2027/0026
    • Methods and apparatus for data synchronization in communication systems using repetitive preamble patterns. In one embodiment, a method includes receiving a signal, where the received signal includes a data unit. The data unit includes a preamble symbol, and the preamble symbol has a start time and includes Q portions, each having the same pattern. The method further includes determining multiple possible values of a frame timing (FT). The method further includes determining multiple correlation functions including at least one correlation function corresponding to each of the multiple possible values of the FT, such that a given correlation function corresponding to a given possible value of the FT represents a correlation between data in two non-adjacent portions of the Q portions associated with the given FT. The method further includes selecting one of the multiple possible values of the FT based at least in part on the multiple determined correlation functions.
    • 使用重复前导码模式的通信系统中的数据同步的方法和装置。 在一个实施例中,一种方法包括接收信号,其中所接收的信号包括数据单元。 数据单元包括前导符号,并且前导码符号具有开始时间,并且包括各自具有相同模式的Q个部分。 该方法还包括确定帧定时(FT)的多个可能值。 该方法还包括确定包括与FT的多个可能值中的每一个相对应的至少一个相关函数的多个相关函数,使得对应于FT的给定可能值的给定相关函数表示两个非可变值中的数据之间的相关性, 与给定FT相关联的Q部分的相邻部分。 该方法还包括至少部分地基于多个确定的相关函数来选择FT的多个可能值中的一个。
    • 17. 发明授权
    • Frame synchronization in orthogonal frequency-division multiplexing systems
    • 正交频分复用系统中的帧同步
    • US08160169B1
    • 2012-04-17
    • US13214766
    • 2011-08-22
    • Jungwon LeeQing Zhao
    • Jungwon LeeQing Zhao
    • H04K1/10
    • H04L27/2647H04L5/0007H04L25/0224H04L27/2613H04L27/2656H04L27/2657H04L27/2662
    • A system including a magnitude measuring module, an energy normalization module, and a metric generation module. The magnitude measuring module is configured to measure magnitudes of real portions of differentially demodulated signals, wherein the differentially demodulated signals are generated by differential demodulation of signals received from a base station. The energy normalization module is configured to generate a sum of energies of a plurality of subcarriers included in the signals received from the base station. The metric generation module is configured to generate a plurality of metrics for a plurality of symbols included in the signals received from the base station. The metric generation module is further configured to detect, based on the plurality of metrics, a preamble symbol included in the signals received from the base station.
    • 一种包括幅度测量模块,能量归一化模块和度量生成模块的系统。 幅度测量模块被配置为测量差分解调信号的实部的幅度,其中通过对从基站接收的信号的差分解调产生差分解调信号。 能量归一化模块被配置为生成包括在从基站接收的信号中的多个子载波的能量之和。 度量生成模块被配置为为从基站接收的信号中包括的多个符号生成多个度量。 度量生成模块还被配置为基于多个度量来检测包括在从基站接收的信号中的前导码符号。