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.
出处
《电讯技术》
北大核心
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)~~
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
software defined radio
digital receiver
timing synchronization
quadrature amplitude modulation （QAM）
gardner algorithm
multi - rate
