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高动态短时突发通信系统的载波同步技术 预览 被引量:2

Carrier Synchronization of High Dynamic and Short - term Burst Communication System
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摘要 载波同步是数据解调中的重要环节之一。由于高动态短时突发通信系统的通信时间极短,在算法观测时间内可认为频率无变化,因此可对载波频偏进行一次校频,使之快速落入锁相环快捕带内,然后利用锁相环进行跟踪以完成载波同步。实践表明:利用一种改进的FFT校频技术对载波频偏进行一次校频,能使载波频偏快速落入锁相环快捕带内。最后分别对改进的FFT校频技术度锁相环进行了仿真分析,结果表明该方法在低信噪比下仍具有良好的性能。 Carrier synchronization is one of the most important parts of demodulation. The communication of high dynamic and short-term burst communication system is yery short, and the frequency is considered no change during the observation, so we can have a frequency correction for the carrier frequency deviation, which makes it come into fast capture bandwidth quickly,and then a phase- lock loop is used to track it for ending of the carrier synchronization. It has been proved that An improved FFT frequency correction technology,which makes carrier frequency deviation come into fast capture bandwidth quickly,is presented to correct frequency. Finally,a simulation analysis for the improved FFT frequency correction technology and phase-lock loop is maked,the result shows that the method also has a good performance in the low SNR situation.
作者 邹永 郑林华 刘少阳 ZOU Yong,ZHENG Linhua, LIU Shaoyang (Electronic Science & Engineering College, National University of Defense Technology, Changsha,410073, China)
出处 《现代电子技术》 2007年第1期 12-13,16,共3页 Modern Electronic Technique
关键词 高动态 短时突发 载波同步 FFT high dynamic short - term burst carrier synchronization FFT
作者简介 邹永 男,1981年出生,湖南安化县人,硕士生。主要研究方向为数据解调系统设计。 郑林华 男,教授,博士生导师,中国电子学会、通信学会高级会员,通信理论与信号处理委员会、宇航学会、湖南省交换委员会委员。主要研究方向为卫星通信、航天测控、通信系统仿真与设计。
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