一种改进的数字电视地面广播传输系统的频偏跟踪方法  

A New Frequency Offset Tracking Algorithm for the DTMB System

作　　者：康玉文[1] 

机构地区：[1]漳州职业技术学院电子工程系,福建漳州363000

出　　处：《合肥学院学报（自然科学版）》2016年第1期75-80,共6页Journal of Hefei University :Natural Sciences

基　　金：福建省科技平台建设-重点实验室(2008J1002)资助

摘　　要：针对我国数字电视地面广播传输系统DTMB中频偏跟踪算法抗多径和噪声干扰性能不足、无法完全消除频偏影响的问题,基于对相干AFC频偏细估计算法的分析,提出了改进算法。首先介绍DTMB系统帧结构以及跟踪环路结构,然后对频偏跟踪算法依次进行理论演绎和仿真验证。MATLAB仿真表明,改进算法在较强干扰下能够基本消除频偏影响。Base on the analysis of the coherent AFC frequency fine estimation algorithm, this paper puts forward an improved algorithm on the problem of the inadequate performance on resisting to multipath and noise and unable to eliminate the frequency offset completely in china digital terrestrial television broadcasting transmission system DTMB. This paper firstly introduces frame structure and trace-loop structure of DTMB system, and then interprets the frequency offset tracing algorithm theoretically and simulates the algorithm. MATLAB simulation shows that the improved algorithm can eliminate the frequency offset in the strong interference.

关 键 词：频偏跟踪 相干AFC DTMB系统 频率同步 

分 类 号：TN943[电子电信—信号与信息处理]