一种改进的Fitz载波频偏估计方法及其仿真

为了解决低信噪比条件下载波频偏估计中估计范围和估计精度的矛盾，在比较分析现有经典估计方法的基础上，提出了一种改进的Fitz载波频偏估计方法，利用自相关序列差分代替自相关序列相位估计频偏。此方法将频偏估计范围提高到数据速率的一半，同时又保持了原有Fitz方法的低信噪比门限。通过仿真验证了改进频偏估计方法对大频偏和低信噪比的适用性。

An improved Fitz carrier frequency offset estimation algorithm and simulation

In order to solve the problem of the contradiction between capturing range and estimation accuracy of frequency offset estimation methods for low signal to noise ratio (SNR) condition,an improved Fitz frequency offset estimation method is proposed.The phase of autocorrelation sequence is replaced with autocorrelation sequence difference to estimate frequency offset. The improved estimation method extends its estimation range to a half data rate, at the meantime, its SNR threshold is as low as the Fitz method.The applicability of the improved method for large frequency offset and low SNR is verified by simulation.