OFDM系统中基于训练符号的定时同步算法  

Timing synchronization algorithm based on training symbol for OFDM systems

作　　者：蒋阳[1] 罗艳[1] 罗杨[1] 

机构地区：[1]重庆大学通信工程学院,重庆400030

出　　处：《计算机应用》2010年第7期1754-1756,共3页journal of Computer Applications

基　　金：国家自然科学基金资助项目(60872038);"211工程"三期建设项目(S-09102)

摘　　要：正交频分复用(OFDM)作为一种高效的数据传输技术,具有良好的抗衰落能力,应用前景非常广阔。但是OFDM对同步偏差十分敏感,同步偏差的产生会使OFDM系统性能大大降低。在Schmidl-Cox算法的基础上,通过改进训练符号结构来完成符号的定时同步,给出了具体的改进算法,并对改进算法进行了仿真分析。结果表明,改进算法消除了原算法定时测度峰值平台模糊现象,提高了定时估计的精度;且在同等条件下改进算法较原算法有更低的误码率。Orthogonal Frequency Division Multiplexing（OFDM）,as an efficient data transmission technology,has good anti-fading ability and broad application prospect.However,OFDM is particularly sensitive to the synchronization errors that can greatly decrease the OFDM system performance.In this paper,based on Schmidl-Cox algorithm,by improving the training symbols to complete the symbol timing synchronization,the improved algorithm was given in detail and simulated.The results show that the improved algorithm eliminate the distinction of timing measurement stage and promote the precision of timing estination,moreover,it has lower bit error rate under the same conditions.

关 键 词：正交频分复用 定时估计 训练符号 同步算法 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]