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介绍了全数字时钟恢复方案中采用Farrow结构高效实现内插滤波器的设计方法.提出一种计算Farrow结构内插滤波器系数的算法,使得接收机输出信号的均方误差始终最小.仿真结果表明,与传统的内插滤波器设计相比,应用本文算法的全数字同步方案提高了接收机输出均方差和输出信噪比的性能,并且降低了时钟恢复方案中内插滤波器的实现复杂度.
This paper introduces the design method of implementing the interpolation filter with Farrow structure efficiently in all-digital clock recovery scheme.A new algorithm to calculate the interpolation coefficient of Farrow structure is proposed, which minimizes the mean square error of the output signal of the receiver.Simulation results show Compared with the traditional interpolation filter design, the all-digital synchronization scheme using this algorithm improves the receiver’s output mean square error and output signal-to-noise ratio performance and reduces the implementation complexity of the interpolation filter in the clock recovery scheme .