一种基于训练序列的OFDM定时同步改进算法  

An Improved Timing Synchronization Algorithm for OFDM Systems Based on Training Sequence

作　　者：盛渊[1] 罗新民[1] 

机构地区：[1]西安交通大学信息与通信工程研究所,西安710049

出　　处：《电讯技术》2008年第9期84-87,共4页Telecommunication Engineering

摘　　要：针对定时同步和频率同步与载波间干扰和符号间干扰密切相关的问题,提出了一种基于训练序列的OFDM定时同步改进算法。新算法在Schmidl和Cox提出的定时同步方法基础上,同时利用训练序列的时域重复结构及其循环前缀的特点通过滑动相关来完成定时同步。理论分析和仿真结果表明,新算法与SC算法相比大大提高了定时同步的精度,有效地解决了SC算法因峰值平台造成定时同步模糊性的问题。Aiming at the close relationship between timing ＆ frequency synchronization and canner ＆ sigual interference, an improved timing synchronization algorithm for OFDM systems based on training sequence is proposed. Based on the Schmidl and Cox＇ s algorithm （SC） , the repeat structure of training sequence and characteristic of its cyclic prefix are used si nultaneously in the new algorithm to complete the time synchronization by sliding correlation. The result of simulation shows that the improved algorithm achieves better timing precision. Meanwhile, the timing synchronization ambiguity caused by the peak plateau in SC algorithm is effectively resolved.

关 键 词：正交频分复用 定时同步 循环前缀 训练序列 

分 类 号：TN914[电子电信—通信与信息系统]