基于软判决反馈的载波频偏估计方法  

Carrier Frequency Offset Estimation Scheme Based on Soft Decision Feedback

作　　者：吴春航 李云[1] 刘解华 吴彦奇 

机构地区：[1]重庆邮电大学移动通信技术重点实验室,重庆400065 [2]北京华力创通科技股份有限公司,北京100094

出　　处：《电视技术》2015年第3期81-83,88,共4页Video Engineering

基　　金：国家"863"计划项目(2012AA01A509);国家科技重大专项(2013ZX03006003-002)

摘　　要：卫星移动通信中,针对短突发独特字个数很少,传统的频偏估计性能差,导致载波跟踪性能严重下降的问题,提出了一种基于软判决反馈的载波频偏估计方案。在对接收短突发信号进行软判决反馈得到短突发信号的估计基础上,利用部分估计信号作为独特字,进行频偏估计,用于载波跟踪。仿真结果表明,提出的方案能较大地提高载波频偏估计性能。At the situation that the short burst has a few unique word, so the conventional frequency offset estimation has poor per- formance, which deteriorats the performance of carrier tracking. Aiming at this problem, a carrier frequency offset estimation scheme based on soft decision feedback estimation in mobile satellite communication system is proposed. After soft decision feed- back estimation of the received short burst signal, part of the estimation signals are used as unique word for frequency offset estima- tion and carrier tracking. The simulation results show that the proposed scheme can improve the performance of carrier frequency offset estimation significantly.

关 键 词：卫星移动通信 频偏估计 短突发 软判决反馈 

分 类 号：TN927.23[电子电信—通信与信息系统]