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针对无线数字通信中的载波频率同步问题,提出一种改进的载波频偏估计算法。分析L&R频差估计算法中估计范围受限的原因,针对性地提出改进方法。首先利用Rife算法得到频率粗估计值,然后利用L&R算法进行频率精估计。该方法以一定复杂度的代价极大地扩展了估计范围,同时保持了L&R算法高的估计精度和Rife算法宽的估计范围。文中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 wireless digital communication, an improved carrier frequency offset estimation algorithm is proposed. Analyze the reason why the estimation range of L & R frequency difference estimation algorithm is limited, and put forward the improvement method in a targeted way. First of all, we use Rife algorithm to get the rough estimate of frequency, and then use L & R algorithm to make frequency fine estimation. This method greatly extends the estimation range with a certain complexity, while maintaining the high estimation accuracy of L & R algorithm and the wide estimation range of Rife algorithm. In this paper, the implementation steps of the improved algorithm are given, and the effectiveness of the algorithm is proved by MATLAB simulation.