一种改进的Fitz频偏估计算法

针对通信接收中的载波同步问题,提出一种基于Fitz算法的改进载波频偏估计算法.分析了Fitz算法频偏估计方法中估计范围受限的原因,针对性地提出了改进方法,利用离散傅里叶变换(DFT)算法得到基准频偏,以此修正大间隔自相关函数估计频偏,保持了Fitz算法的估计精度优势,极大地扩展频偏估计范围,同时具有低的信噪比门限.最后给出了改进算法的实现步骤,并通过MATLAB仿真实验证明了算法的有效性.

An improved Fitz frequency offset estimation algorithm

The communications receiver carrier frequency synchronization is proposed based on the improvement of the Fitz algorithm carrier frequency offset estimation algorithm. Analysis of the Fitz algorithm offset estimation method, it is estimated that the limited scope of the reason, puts forward an improved method, using the discrete Fourier transform (DFT) algorithm is the baseline frequency offset, a large interval of this correction is estimated that the frequency autocorrelation function side, maintaining the estimation accuracy advantage of the Fitz algorithm, greatly expanded frequency offset estimation range, but also has a low SNR threshold. Steps of the improved algorithm, simulation results show the effectiveness of the algorithm.