DTMB中系统的高精度频率跟踪方法  

High-precision Frequency Tracking Method for DTMB System

作　　者：戴凌龙[1] 符剑[1] 王军[1] 杨知行 

机构地区：[1]清华大学电子工程系微波与数字通信国家重点实验室,北京100084

出　　处：《电视技术》2008年第11期4-6,22,共4页Video Engineering

基　　金：国家"863"计划项目(2007AA01Z2B6)

摘　　要：分析了适用于地面数字电视广播国家标准DTMB系统的频率跟踪方法,在此基础上提出了一种改进的高精度频率跟踪方法——卡尔曼滤波法。在AWGN和典型的DTTB多径信道下的仿真结果和分析表明,该方法同时具备了传统频率跟踪方法中两种不同环路带宽下收敛速度快、频率跟踪抖动小的优点,频率跟踪的精度达到了0.15%。The frequency track method for the Chinese national standard on terrestrial digital television broadcasting system （DTMB） is analyzed and then an improved high-precision approach based on Kalman filtering is proposed in this paper. Simulation results show that the proposed method possesses two strongpoints respectively shared by two different conventional track loop with different loop-bandwidth： fast convergence speed and low frequency jitter, and also provides much higher precision compared with the conventional method.

关 键 词：地面数字电视 载波频偏 高精度 卡尔曼滤波 频率跟踪 

分 类 号：TN949.197[电子电信—信号与信息处理]