一种星上多载波APSK信号定时恢复方法  

On-board Multi-carrier APSK Signal Timing Recovery Method

作　　者：李想[1] 郝学坤[1] LI Xiang HAO Xue-kun(The 54th Research Institute of CETC, Shijiazhuang Hebei 050081, China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2017年第1期27-31,共5页Radio Engineering

基　　金：国家高技术研究发展计划("863"计划)基金资助项目(2013AA122105)

摘　　要：APSK信号应用在基于MF-TDMA星上处理的卫星通信系统中增加了系统的灵活性,多载波APSK信号定时恢复是实现星上整体解调处理的一个关键步骤。针对多载波APSK信号的特殊性和星上资源的有限性,提出了一种基于2倍采样加内插的多载波APSK信号定时恢复方法,在多载波情况下该方法与常规的定时恢复方法相比能够减小一半的数据缓存量,为星上处理节约了大量宝贵的存储空间,具有处理时延小和对信号幅度不敏感的优点。通过仿真给出了本方法性能与内插滤波器阶数和运算数据长度的关系。仿真结果表明,该方法能够较好地完成星上多载波APSK信号的定时恢复。APSK signal applied in on-board processing satellite communication system based on MF-TDMA increases the flexibility of the system.Multi-carrier APSK signal timing recovery is a key step to realize the on-board integral demodulation processing. A new multi-carrier APSK signal timing recovery method based on twice-sampling and interpolationis proposed according to the particularity of multi-carrier APSK signal and the limited on-board resource.Compared with conventional timing recovery methods,it can reduce half of the data cache memory in the multi-carrier scenario and save a lot of valuable storage space for on-board processing.In addition, it has advantages of low processing delay and insensitiveness to signal amplitude.The relationship between the performance of this proposed method and the order of interpolation filter and the length of operational data is provided by simulation, The simulation results indicate that the new method is able to complete on-board multi-carrier APSK signal timing recovery much better.

关 键 词：多载波 APSK信号 内插 半带滤波器 定时恢复 

分 类 号：TN929.5[电子电信—通信与信息系统]