基于新型前导符号的OFDM同步算法  

Synchronization algorithm based on a new preamble symbol for OFDM systems

作　　者：贾玮玮[1] 慕福奇 

机构地区：[1]中国科学院大学微电子学院,北京100049 [2]江苏中科羿链通信技术有限公司,江苏无锡214135

出　　处：《电视技术》2017年第4期142-147,共6页Video Engineering

摘　　要：在多径信道中,循环前缀最大似然估计盲OFDM同步算法的性能较差,循环前缀集相关同步算法增强了对抗多径的能力,获得了较好的同步性能,但同步时延非常大。为了缩短集相关同步算法的同步时延,设计了一种前导符号,基于此前导符号,提出了一种快速集相关运算同步算法。蒙特卡洛仿真结果表明,在多径信道下,该算法比循环前缀集相关同步算法具有更好的同步性能。进一步的分析还证明本文算法的同步时延也大大缩短。In muhipath channels, the Maximum Likelihood blind synchronization algorithm using the cyclic prefix for OFDM sys- tems performs poorly. The synchronization based on the set correlation of the cyclic prefix performs better because of the better ca- pacity of confronting the muhipath effect. But this synchronization costs a long time. In order to shorten the synchronization time delay, in this paper, a synchronization algorithm is proposed for OFDM systems in muhipath channels, which uses a preamble sym- bol designed specially. The results of Monte-Carlo simulation verify that, this algorithm has a better time and frequency synchroni- zation performance in muhipath channels. Further analysis also proves that the synchronization delay of this algorithm is greatly re- duced.

关 键 词：正交频分复用 同步 前导符号 ZADOFF-CHU序列 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]