摘要
OFDM系统以其有效的对抗多径衰落的特性以及较高的频谱资源利用率受到广泛的关注。但OFDM还有许多关键技术有待解决。相对于单载波调制来说,OFDM对载波频偏更敏感,很小的载波频偏都将导致解调性能的急剧下降。本文在OFDM系统模型下研究了OFDM系统中的三种信道估计算法:基于训练序列的信道估计算法、基于Decision-Directed思想的信道估计算法和基于导频的信道估计算法,并对这三类算法的性能进行了较详细的分析和比较。
More and more attention is being paid to OFDM system because of it anti-fading feature and high-efficient frequency utilization. But there are still a lot being left to solve. Compared with single-carrier modulation, OFDM is more sensitive to carrier offset. Even very trivial offset leads to steep decrease in performance. In this paper, based on OFDM system model, three different channel estimation algorithms are discussed： training sequence based algorithm, decision-directed based algorithm and pilot based channel estimation algorithm. At the end, we give a comparison for the performance of them.
出处
《科技信息》
2010年第09X期51-52,共2页
Science & Technology Information
