多径信道下的改进型OFDM定时同步方法  

Improved OFDM Timing Synchronization Method in Multipath Channel

作　　者：姚远翔 马文峰 曹逊 吴霞 赵几航 YAO Yuanxiang;MA Wenfeng;CAO Xun;WU Xia;ZHAO Jihang(Army Engineering University,Nanjing Jiangsu 210000,China)

机构地区：[1]陆军工程大学,江苏南京210000

出　　处：《通信技术》2021年第11期2466-2470,共5页Communications Technology

基　　金：国家自然科学基金(No.62001515,No.61771486);江苏省博士后科研资助项目(No.2019K090)。

摘　　要：正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术具有数据传输速率快、频谱利用率高等优点,因此被广泛运用;但是,其对定时同步要求很高,尤其是在多径信道下,准确的定时同步尤为重要。针对这一问题,提出了一种基于扎多夫-楚(Zadoff-Chu,ZC)序列的前导码结构,并使用动态阈值法进行判别的改进型OFDM定时同步方法,最后在多径信道下通过仿真验证了其性能。Orthogonal Frequency Division Multiplexing(OFDM)technology has the advantages of fast data transmission rate and high spectrum efficiency,so it is widely used.However,it has high requirements for timing synchronization,especially in multipath channels,where accurate timing synchronization is particularly important.Aiming at this problem,an improved OFDM timing synchronization method based on Zadoff-Chu(ZC)sequence preamble structure and using dynamic threshold method is proposed.Finally,its performance is verified by simulation in multipath channel.

关 键 词：正交频分复用 定时同步 ZC序列 多径信道 

分 类 号：TN929.53[电子电信—通信与信息系统]