基于辅助数据的OFDM时间同步算法  

OFDM Time Synchronization Algorithm Based on Auxiliary Data

作　　者：汪莹 张珮明 施展 王劲[2] 李家樑 王潮雄 WANG Ying;ZHANG Pei-Ming;SHI Zhan;WANG Jin;LI Jia-Liang;WANG Chao-Xiong(Dispatching and Control Center,Guangdong Electric Power Co.Ltd.,Guangzhou 510600,China;Guangdong Planning and Designing Institute of Telecommunications Co.Ltd.,Guangzhou 510630,China;South China University of Technology,Guangzhou 510641,China)

机构地区：[1]广东电网有限责任公司电力调度控制中心,广州510600 [2]广东省电信规划设计院有限公司,广州510630 [3]华南理工大学,广州510641

出　　处：《计算机系统应用》2020年第2期140-144,共5页Computer Systems & Applications

摘　　要：为了实现OFDM(Orthogonal Frequency Division Multiplexing,正交频分复用)系统在任意载波频偏下的高精度同步,本文提出了一种基于辅助数据的系统定时偏移估计方法.首先,在高斯白噪声信道下,基于不具有特殊结构的辅助数据,推导了最大似然准则下的最佳同步算法;然后针对最大似然法复杂度过高的问题,设计了计算复杂度降低的次优方法;最后,采用蒙特卡罗仿真,在频率选择性瑞利衰落信道下,对得到的新算法进行了评估.实验结果表明,新方法的定时性能显著优于传统算法.In order to realize high-precision synchronization of OFDM(Orthogonal Frequency Division Multiplexing)under arbitrary carrier frequency offset,this study proposes a system timing offset estimation method based on auxiliary data.Firstly,under the Gaussian white noise channel,based on the auxiliary data without special structure,the optimal synchronization algorithm is derived under the maximum likelihood criterion.Then,under the consideration that the maximum likelihood method is too complex,a sub-optimal method,which has reduced computational complexity,is proposed.Finally,the performance of the proposed timing method is evaluated by Monte Carlo simulations under the frequency selective Rayleigh fading channel.The simulation results show that the timing performance of the proposed method is significantly better than the traditional algorithms.

关 键 词：正交频分复用 子载波间干扰 定时 同步 估计 最大似然 

分 类 号：TN929.53[电子电信—通信与信息系统]