摘要
该文提出了利用自相关矩阵实现OFDM信号符号定时参数和频偏估计算法。该算法不需要数据辅助,通过使得接收信号自相关矩阵非对角线元素的模值之和达到最小实现分数倍频偏的跟踪,通过判断对角线元素位置发生的移动可以准确地估计整数倍频偏,同时通过使得对角线上对应虚载波位置的元素的模值之和最小实现符号同步。文中给出了算法的推导过程和具体应用的步骤。仿真结果表明该算法具有较大的估计范围以及良好的估计精度。
An algorithm using auto-correlation matrix of received data for OFDM timing and carrier frequency offset estimation is presented in this paper. The algorithm does not need training data. Fractional frequency offset tracking and frame synchronization are implemented by minimizing the modular sum of off-diagonal elements and diagonal elements whose position is corresponding to virtual carrier＇s number respectively. Integral frequency offset is estimated exactly based on the position movements of diagonal elements. Mathematical derivation is also provided in the paper. The simulation results show that the proposed algorithm has a large estimation range and a high resolution.
出处
《电子与信息学报》
EI
CSCD
北大核心
2008年第2期383-387,共5页
Journal of Electronics & Information Technology
基金
国家部级基金(6130320)
河南省自然科学基金(0611051400)
关键词
盲估计
OFDM同步
符号定时
载波频率偏差
虚载波
Blind estimation
OFDM synchronization
Symbol timing
Carrier frequency offset
Virtual carrier
