适用于多速率高阶QAM的定时同步改进算法  

A Modified Method of Timing Synchronization for Multi-rate High-order QAM

作　　者：张莉莉[1] 贺知明[1] 

机构地区：[1]电子科技大学电子工程学院,成都611731

出　　处：《电讯技术》2012年第4期508-513,共6页Telecommunication Engineering

基　　金：国家自然科学基金委员会-中国工程物理研究院联合基金资助项目(10876006)~~

摘　　要：针对速率可变的高阶正交幅度调制(QAM)信号定时同步问题,提出了一种基于Gardner理论的定时同步改进算法。新算法改原有滤波器结构为两级插值级联优化结构来实现多速率信号的定时同步,可独立于载波同步单独使用,比传统结构具有更强的普遍适用性。仿真结果表明,该算法可以准确地对速率可变的128QAM信号进行同步。On the basis of Gardner interpolation theory about timing synchronization, a modified timing recovery method is proposed to adapt multi - rate high - order QAM demodulation. The algorithm replaces the traditional filter with two - stage cascade filters to realize the carrier synchronization, which is more suitable for multi - rate timing synchronization. The simulation results show that the algorithm can be used in timing Synchronization for 128 QAM signal precisely.

关 键 词：软件无线电 数字接收机 定时同步 正交幅度调制 GARDNER算法 可变速率 

分 类 号：TN919[电子电信—通信与信息系统]