摘要
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。
Aiming at the problem of carrier frequency synchronization in receiver, an improved Fitz frequency offset estimation algorithm is proposed. The reason of limited estimation range in Fitz frequency offset estimation algorithm is analyzed, and the improved method is proposed. The discrete Fourier transform （DFT） algorithm is used to get the baseline frequency offset, which could be used to correct the estimated frequency offset of large interval autocorrelation function. It can maintain the estimation accuracy advantage of the Fitz algorithm, and greatly expands frequency offset estimation range, and has a low SNR threshold. Finally, the implementation steps of the improved algorithm are given, and the simulation results show the effectiveness of the algorithm.
出处
《电视技术》
北大核心
2013年第1期130-132,150,共4页
Video Engineering
关键词
同步
载波频率
频偏估计
信号处理
synchronization
carrier frequency
frequency offset estimation
signal processing
