一种DAB系统小数倍频偏估计新方法  

A New Method of Fractional Frequency Offset Estimation for DAB

作　　者：邸娜[1] 吴智勇[1] 万戈[1] 杨明[1] 

机构地区：[1]国家广播电影电视总局广播科学研究院无线技术研究所,北京100045

出　　处：《电视技术》2008年第z1期11-14,共4页Video Engineering

基　　金：财政部基本科研业务费项目资助(调频及中波频段数字音频广播技术研究)

摘　　要：载波频偏估计是OFDM系统接收机中关键的一环,该算法基于欧洲的Eureka147DAB[6]标准,提出了一种新的小数倍频偏估计方法,首先利用循环前缀对小数倍频偏进行捕获[2],并补偿到数据中,再用本地相位参考符号与DAB帧中经过补偿的相位参考符号进行相关运算,实现剩余小偏的估计和跟踪。此方法具有频偏估计范围大,精度高的优点。仿真分析结果表明了该方法较文献[5]所提方法具有更好的估计性能。Estimation of carrier frequency offset is a key part of OFDM receivers. The proposed algorithm presents a new method to estimate fractional frequency offset based on phase reference symbol for the Eureka 147 DAB1.Firstly, it uses the cyclic prefix to solve the acquisition problem by obtaining a coarse frequency offset2as soon as possible .With the help of this acquisition stage, the second stage should be able to estimate the residual frequency offset and perform the tracking task by using the phase reference symbol in DAB frame. The analysis and simulation results showed that this new method can estimate efficiently frequency offsets with a larger estimation range, and has much better performance than that of reference document 3.

关 键 词：Eureka 147 DAB标准 小数倍频偏 OFDM技术 

分 类 号：TN911.23[电子电信—通信与信息系统]