一种改进的MIMO-OFDM系统频偏估计方法  

An improved frequency offset estimation method in MIMO-OFDM systems

作　　者：李萌[1] 王革思[1] 张勇[1] 何煜[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2010年第6期16-19,共4页Applied Science and Technology

摘　　要：针对传统的2个训练符号的载波频偏估计算法提出一种改进算法,并设计出一种新的频偏估计器对多入多出正交频分复用(MIMO-OFDM)系统的不同信道的整数频偏和小数频偏进行估计.该算法仅利用单个训练符号来进行频偏估计,其训练符号采用正交性良好的Walsh序列来设计,用以区分不同的信道;利用同一训练符号内相邻的偶数子载波上数据的差分关系完成整数频偏估计.仿真结果表明,新的频偏估计器可以获得较好的载波频偏估计性能.In this paper,we propose an improved estimation algorithm and design a new estimator for both the integral part and fractional part of the frequency offset in different channels of the MIMO-OFDM systems.This algorithm is based on the conventional frequency offset estimation algorithm which requires two training symbols.This algorithm uses only one training symbol to estimate the frequency offset,and the design of the training sequence is based on the Walsh codes which can be used to distinguish different channels.We use the differential coding between two data symbols transmitted through two adjacent even subcarriers to estimate the integral frequency offset.The simulation results show that this new estimator could achieve good estimation performance.

关 键 词：多入多出正交频分复用 训练序列 Walsh序列 整数频偏估计 小数频偏估计 

分 类 号：TN919.3[电子电信—通信与信息系统]