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

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.