OFDM系统载频偏移估计算法的研究  

Algorithms of carrier frequency offset estimation in OFDM system

作　　者：李新民[1] 康晓非[1] 张鸣[1] 

机构地区：[1]西安科技大学通信与信息工程学院,陕西西安710054

出　　处：《西安科技大学学报》2006年第4期549-552,共4页Journal of Xi’an University of Science and Technology

摘　　要：载波频率偏移是OFDM系统实现的关键问题之一。分析了OFDM系统载频偏移估计的2种算法,即利用循环前缀和训练序列方法。它们均为最大似然估计方法。分别讨论了它们的基本思想、实现方法和仿真结果。可以看出基于循环前缀算法复杂度较小,精度不高,而基于训练序列的算法有较高的估计精度,但降纸了系统传输效率。Carrier frequency offset is one of the key problems in OFDM system. Two foundational methods, cycling prefix - based and training sequence - based algorithms, to estimate OFDM carriers frequency offset are analyzed. Then it discusses their basic thoughts, implementing methods and simulation resuits. Finally, merits and demerits of every algorithm are supposed. It concludes that the cycling prefix - based algorithm has less complexity and less precision, and that the training sequence -based algorithm has better estimation performance at the cost of transmission efficiency.

关 键 词：正交频分复用 载波频率偏移估计 最大似然估计 

分 类 号：TN919.3[电子电信—通信与信息系统]