一种数字调相接收系统定时恢复算法

定时恢复是数字接收机同步系统的关键技术。经典数字接收机为防止最佳采样点抽取发生偏移造成接收信号散点图发散,往往通过锁相环控制抽样器以实现最佳采样点的抽取,而在全数字接收机中,最佳采样点是通过对采样信号进行插值计算得到的。全数字相位调制接收机定时恢复环路主要由平方定时相位偏差估计、定时控制单元和牛顿内插滤波器三部分组成。仿真结果充分表明该环路能够很好的实现MPSK、MQAM信号的定时恢复。

A Timing Synchronization Algorithm for Digital Phase Modulation Receiving System

Timing synchronization is one of the important requirements for correct demodulation in receiver.The scatter diagram of received signal would be dispersed,if the samples aren’t optimal in classical digital receiver.This problem is solved by phase-locked loop.However,in all–digital receiver,the optimal sample is achieved by interpolating the independent samples.The timing synchronization system in all-digital phase modulation receiver consists of such three parts as squaring timing phase deviation estimation,timing controller unit,and Newton interpolation filter.The simulation result indicates that this loop could fairly implement the timing synchronization for MPSK and MQAM signal.