摘要
卫星通信作为大有发展前途的通信方式之一,在全球范围内得到了广泛的应用。针对卫星通信中由于多普勒频移造成的大频偏无法利用相位处理直接完成的问题,本文提出了一种基于ABPSK调制方式的自适应盲同步载波同步算法,包括载波频偏估计算法和载波相位估计算法。该算法利用前向载波频偏估计开环与载波相位估计闭环校正,完成载波频率的快速捕获和载波相位的跟踪。利用ADS软件进行理论分析和计算机仿真表明,该算法简单有效,运算量小,便于用FPGA器件来实现,适用性强。
Communication by satellites has been applied all over the world as one of the most important means of communication. An adaptive blind carrier synchronization algorithm including frequency offset detector algorithm and phase detector algorithm, is proposed for the modulation of ABPSK which is used in the digital communications by satellites, including the carrier frequency offset estimation algorithm and carrier phase estimation. It realizes fast capture of the carrier frequency and keeps the carrier phase utilizing open-loop frequency offset detector and closed-loop phase estimator. At the same time, the algorithm solves the problem that it is difficult to recover carrier by phase process directly because of frequency offset with large range. The analysis and computer simulation by the software of ADS shows that this algorithm is simnle,efficient and very suitable to FPGA implementation.
出处
《电子测量技术》
2008年第10期138-141,共4页
Electronic Measurement Technology
关键词
数字卫星通信
ABPSK
载波恢复算法
digital communications by satellites
ABPSK
carrier synchronization algorithm
