基于数字平方算法的APSK信号位定时误差估计方法  

A timing error estimation method of APSK signals based on digital square algorithm

作　　者：胡景明[1] 郭道省[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《电子技术应用》2013年第7期97-99,共3页Application of Electronic Technique

基　　金：国家高技术研究发展计划("863"计划)资助项目(2012AA121605);国家自然科学基金(61032004;60972061)

摘　　要：APSK高阶调制用于卫星通信时,信号受收发系统的时钟频差影响严重,同步算法也较为复杂。介绍了APSK的信号模型,在此基础上,采用一种数字平方算法估计位定时的误差。仿真结果表明,该方法能较好地估计出APSK信号位定时误差,且算法不受载波频偏的影响。通过仿真得出了算法性能与运算数据长度的关系。APSK signals are seriously affected by the transceiver system when APSK is applied to satellite communications, and the synchronization algorithm is complex. The model of APSK signals is introduced, and a digital square algorithm is adopted to estimate the timing error. Simulation results show that this method performs well on estimating the timing error and it is uninflu- enced by the carrier frequency offset, and the relation between algorithm performance and data length is obtained by simulatios.

关 键 词：APSK信号 定时误差恢复 数字平方算法 傅氏变换 

分 类 号：TN911.73[电子电信—通信与信息系统]