基于OFDM的联合信道估计的定时方法  

Precise Timing Method for Joint Channel Estimation in OFDM Systems

作　　者：刘晓杰[1] 刘二平 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]海军驻保定地区航空军事代表室,河北保定071000

出　　处：《无线电工程》2016年第10期29-32,共4页Radio Engineering

基　　金：国家高技术研究发展计划("863"计划)基金资助项目(2013AA122105)

摘　　要：针对正交频分复用(OFDM)系统中,传统的时域相关法无法满足定时同步精度的要求,提出了一种联合信道估计的同步算法,给出了理论推导,在得到信道估计结果的基础上对初始的定时同步结果进行修正,进而得到较为精确的定时位置,解决了同步头摆动等定时不准确的问题。用Matlab对提出的算法进行了仿真,仿真结果表明,此改进算法能满足低信噪比下的定时同步要求。In the orthogonal frequency division multiplexing system,the traditional time domain correlation method can not meet the requirements of timing synchronization accuracy. A synchronization method based on channel estimation is proposed for the first time. Theoretical derivation and experimental results are given. On the basis of the channel estimation,the initial results are corrected and the timing position is obtained,the problem of swinging of the synchronization head is solved. Finally,Matlab simulation results show that this improved algorithm can meet the requirements of the timing synchronization in low SNR.

关 键 词：OFDM 定时同步 信道估计 

分 类 号：TN81[电子电信—信息与通信工程]