全数字时钟恢复方案中内插滤波器的设计

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.

Design of the interpolation filter in an all-digital timing recovery scheme

A design method was introduced to efficiently implement an interpolator by Farrow structure,which can be used in an all-digital timing recovery scheme.An algorithm was presented to calculate the interpolator coefficients of Farrow structure and minimize the mean square error(MSE)at the output of the receiver.Simulation results show that compared with other conventional interpolation filters,the performance with this optimized Farrow coefficients was improved in minimum MSE and the implementation complexity was reduced.