摘要
针对现有前向载波频偏估计算法存在估计精度和估计范围矛盾的问题,通过将相位展开引入Fitz算法,设计了一种宽范围高精度的载波频偏估计算法。该算法对去除调制信息的MPSK信号求取自相关函数,并且利用迭代运算消除其相位折叠,再利用Fitz算法对已消除相位折叠的自相关函数加权求和,将Fitz算法的估计范围从±1/(2MNT)扩展为±1/(2MT),而且没有损失估计精度。仿真结果表明,在较低的信噪比条件下,该算法仍能获得良好的性能。
To solve the contradiction between estimation range and estimation accuracy in current feed-forward carrier frequency offset estimation algorithm,a carrier frequency offset estimation algorithm with extended range and high accuracy is designed based on Fitz algorithm.First,an iterative algorithm is used to unwrap the autocorrelation function of received MPSK signal.Then the unwrapping autocorrelation function is summed up with the weight of Fitz ’ s approach to extend the estimation range of Fitz algorithm from ±1/（2MNT） to ±1/（2MT）,without loss of accuracy.The simulation results show that,under low SNR circumstance,this algorithm can also have good performance.
出处
《无线电工程》
2014年第3期43-45,共3页
Radio Engineering
基金
国家部委基金资助项目
关键词
载波同步
频偏估计
相位折叠
迭代运算
carrier synchronization
frequency offset estimation
phase wrapping
iterative algorithm
