APSK长突发信号的动态载波相位跟踪
Dynamic carrier phase tracking of long burst APSK signals
徐烽 1邱乐德 2王宇1
作者信息
- 1. 中国空间技术研究院西安分院,陕西西安710100
- 2. 中国空间技术研究院,北京100094
- 折叠
摘要
APSK已被用于宽带数字卫星通信,在采用APSK长突发的卫星通信中,需要对一帧内的载波相位动态变化进行跟踪.针对粗载波同步和符号同步完成后的长突发APSK调制信号,提出一种新的载波跟踪方案,该方案采用一种基于星座分割的NDA鉴相算法,使用两个二阶锁相环,并借助于一个很短的独特码解相位模糊,可在很高的数据传输效率下,克服一般闭环法的捕获时间问题,实现对整帧信号载波相位的顺利跟踪.
Abstract
APSK modulation has been adopted in wideband digital satellite communications.In long-burst digital communications with APSK modulation,carrier phase varies with time and carrier tracking is required.A new method for tracking dynamic phase of long-burst APSK modulated signals after rough frequency recovery and timing recovery is proposed.Using a phase detection algorithm based on constellation partition,two second order PLLs,and with the aid of a short unique word,the proposed structure can successfully track the frequency and phase offset of the whole burst,allowing high data transmission efficiency.
关键词
APSK/长突发/动态载波相位/锁相环/独特码Key words
APSK/long burst/dynamic carrier phase/PLL/unique word引用本文复制引用
出版年
2013
NETL
NSTL
维普
万方数据