一种低复杂度的无导频OFDM系统载波频率偏移的同步方法  

A Low-Complex and Non-Pilot-Aided Carrier Frequency Offset Synchronization Method for OFDM Systems

作　　者：吴虹[1] 袁佳杰[1] 刘军[1] 梁裕民[1] 张冀[1] 丁勇[1] 

机构地区：[1]南开大学信息技术科学学院,天津300071

出　　处：《电子学报》2007年第7期1357-1359,共3页Acta Electronica Sinica

基　　金：天津市自然科学基金(No.06YFJMJC00600);天津市应用基础及前沿技术研究计划重点项目(No.07JCZDJC5700)

摘　　要：针对OFDM系统存在的对载波频偏非常敏感的问题,提出一种低复杂度无导频小数倍频偏的同步方法.根据OFDM符号本身以及循环前缀的特性,在MLE算法之后对残余小数频偏进行同步.在频域完成子载波数据相位差的提取.通过重新利用MLE算法中的取复数相位运算模块,节约了硬件资源.仿真证明该方法能够有效纠正采样引起的频率偏差.According to OFDM systems being very sensitive to carrier frequency offset, a low-complex and non-pilot-aided fractional frequency offset synchronization method is proposed. By employing the properties of OFDM symbol and cyclic prefix, the remaining fractional frequency offset is synchronized after MLE algorithm. The method gets the data phase difference of each subcarrier in frequency domain. Through re-using the phase generating block of complex number in MLE Algorithm, hardware resources are saved. Simulations show that the frequency offset caused by sampling is well corrected, and the method is easy to achieve as well as effective.

关 键 词：正交频分复用 频率偏移 同步 非导频 

分 类 号：TN914.4[电子电信—通信与信息系统]