一种基于自相关矩阵的OFDM信号同步参数盲估计算法

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.

A Blind Estimation Algorithm of Synchronization Parameter for OFDM Signals Based on Auto-correlation Matrix

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.