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    • 8. 发明授权
    • System and method for extracting and compensating for reference frequency error in a communications system
    • 在通信系统中提取和补偿参考频率误差的系统和方法
    • US06567479B1
    • 2003-05-20
    • US09063944
    • 1998-04-21
    • Martin Alderton
    • Martin Alderton
    • H04L2616
    • H03J7/06H04L2027/0032H04L2027/0057
    • A system for extracting and compensating for reference frequency error adapted for use with a communication system. The system includes a frequency generator for outputting a reference signal of a first frequency. The frequency generator has acontrol input for adjusting the first frequency in response to a control signal. A receive circuit receives an input signal and provides an output signal having a first and second component in response thereto. An error extraction circuit provides an error value based on a phase difference between the first component and the second component, and provides the control signal in response thereto. The error extraction circuit preferably includes a positive error counting circuit for generating a positive count when the first component lags the second component and a negative error counting circuit for generating a negative count when the first component leads the second component. A frequency error control circuit generates the control signal from the difference of the positive count and the negative counts.
    • 一种用于提取和补偿适用于通信系统的参考频率误差的系统。 该系统包括用于输出第一频率的参考信号的频率发生器。 频率发生器具有响应于控制信号调整第一频率的控制输入。 接收电路接收输入信号并提供具有响应于此的第一和第二分量的输出信号。 误差提取电路基于第一分量和第二分量之间的相位差提供误差值,并响应于此提供控制信号。 误差提取电路优选地包括:当第一分量滞后于第二分量时产生正计数的正误差计数电路和当第一分量引导第二分量时产生负数的负误差计数电路。 频率误差控制电路根据正计数和负计数的差产生控制信号。