PIP-OFDM系统中的时间和频率同步算法  

Study of Time and Frequency Synchronization Algorithms for PIP-OFDM System

作　　者：郭定平[1] 颜彪[1] 刘松霖[1] 蔡赛燕[1] 

机构地区：[1]扬州大学信息工程学院,扬州225127

出　　处：《无线通信技术》2013年第4期31-34,共4页Wireless Communication Technology

摘　　要：同步是OFDM技术必须解决的问题之一,且传统的同步算法只有当信噪比很大时才能达到很好的效果。该文研究了一种新的PIP-OFDM系统,它是将一种特殊的带内预编码导频信号加入到一般的OFDM系统中,保证系统在低信噪比情况下也能获得很好的同步。对小数倍载波频率粗同步和时间同步估计算法进行了改进,并应用于新的系统。仿真结果表明,改进的算法能够更好的对频率和时间进行估计,从而使得系统能够获得很好的同步性能。Synchronization is one of the problems to be solved for OFDM technology. The traditional synchronization algorithms can achieve very good effect when the signal -to -noise ratio （SNR） is very high. A new PIP - OFDM system is investigated in this paper and it introduces in - band pre - coding of pilot signal into the conventional OFDM system to ensure that the system can also acquire right synchronization under low SNR. Some improvement is implemented for fraction coarse carrier frequency synchronization and fraction time synchronization estimation algorithms. The simulation re- suits show that the better frequency and time estimation can be obtained through using the improved algorithms. Thus the system can gain good synchronization performance.

关 键 词：OFDM PIP—OFDM 频率同步 时间同步 

分 类 号：TN929.53[电子电信—通信与信息系统]