一种用于OFDM系统的高性能频偏估计方法  

Improved Frequency Offset Estimation for OFDM with High Performance

作　　者：周晟[1] 陈惠民[1] 金彦亮[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072

出　　处：《上海大学学报（自然科学版）》2008年第3期225-229,共5页Journal of Shanghai University:Natural Science Edition

基　　金：上海市科委基金资助项目(06dz15013_3);上海市重点学科建设资助项目(T0102)

摘　　要：提出一种应用于高速移动环境下系统频偏估计的方法,使用相关性能优异的Zadoff-Chu序列作为训练序列,将其在一个符号周期内重复4次,利用这种帧结构进行两次频偏估计,实现系统的频率粗、精同步.该方法不仅具有频偏估计范围大和估计精度高的双重优点,而且所有频偏估计过程均在FFT之前完成,加快了系统同步的时间,降低了系统同步复杂度.AWGN信道和Rayleigh衰落信道下的仿真结果验证了新算法的有效性.An improved frequency offset estimation method used in high speed wireless environment is proposed. A training sequence frame is made of Zadoff-Chu sequences with four times repetition. First, the received signal is correlated with local training sequences to eliminate the influence of training sequence. Fine frequency synchronization is achieved by taking two times of frequency offset estimation. The proposed method has good estimation accuracy and large estimation span. All processes of the frequency offset estimation are taken before FFT, leading to a saving of the system synchronization time and reduction of the system complexity. Simulations in AWGN and Rayleigh channels verify validity of the technique.

关 键 词：正交频分复用 频偏估计 ZADOFF-CHU序列 

分 类 号：TN911[电子电信—通信与信息系统]