DVB-S2载波恢复算法研究  

Study on Algorithms of Carrier Recovery in DVB-S2

作　　者：王华[1] 武楠[1] 韩存涛[1] 匡镜明[1] 

机构地区：[1]北京理工大学信息科学技术学院电子工程系,北京100081

出　　处：《北京理工大学学报》2008年第4期347-351,共5页Transactions of Beijing Institute of Technology

基　　金：国家部委预研项目(A2220060034)

摘　　要：推导了DVB-S2系统的载波恢复算法,给出了相关的环路结构并对其性能进行了仿真.仿真结果表明,反馈结构的载波频率粗同步环路的锁定时间与推导的理论值相一致,为了满足相位线性内插的要求,前馈结构的载波频率精同步环路其估计长度不应小于1000个导频段.对相位线性内插算法的内插区间进行修正后,其误比特率提高了0.1 dB.This paper investigates and derives the algorithms of carrier recovery in DVB-S2 system. We present the framework of recovery loop and evaluate the performance by simulation is presented. Simulation results showed that the acquisition time of coarse carrier frequency recovery is in good agreement with theoretical analysis. In order to meet the requirement of pilot assisted（PA） linear interpolation for carrier phase recovery, the number of pilot-symbol blocks used for fine carrier frequency recovery should be more than 1 000. We propose a modification to the interval of carrier phase linear interpolation is proposed,＇ which improves the bit error rate performance about 0. 1 dB.

关 键 词：DVB-S2系统 载波恢复 自动频率控制 

分 类 号：TN911.72[电子电信—通信与信息系统]