数字卫星广播系统采样时钟同步方法

针对数字卫星广播系统中采样时钟偏差会严重影响接收性能的问题,提出了一种采样频率和相位同步方法。该方法利用迟早门进行采样误差估计,利用Farrow滤波器进行插值处理。通过采样频偏调整环路控制Farrow滤波器,实现采样频率和相位同步。实验结果表明,该方法能够在高强度噪声干扰和较大载波频偏环境下,快速准确的实现采样时钟同步。该方法还可以广泛应用于数字地面广播、数字移动广播等多个领域。

Sampling Clock Synchronization for Digital Satellite Broadcasting System

To reduce the performance degradation caused by sampling clock offset,a sampling clock synchronization method for digital satellite broadcasting system is proposed,which uses early-late gate to estimate the sampling error and Farrow filter to perform the interpolation processing.The Farrow filter is controlled by sampling frequency adjust loop,thus realizing sampling frequency and phase synchronization.Experiment results show that the method could establish sampling clock synchronization rapidly and accurately under severe noise interference and carrier frequency offset.The method could also be applied to digital terrestrial broadcasting and digital mobile broadcasting system.