摘要
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。
An improved carrier frequency offset estimation algorithm for the carrier frequency synchronization in wireless digital communications is proposed. The factors that limit the estimation range of L&R algorithm are discussed and the improved method is proposed. Firstly the Rife algorithm is used for the coarse frequency estimation,and then the L&R algorithm is used for the precise estimation. With a certain complexity cost,the method greatly extends the estimation range,while it maintains the advantages of L&R algorithm with high estimation accuracy and Rife algorithm with a wide estimation range. The implementation steps of the improved algorithm are given,and the MATLAB simulation experiments prove its effectiveness.
出处
《遥测遥控》
2013年第5期38-42,共5页
Journal of Telemetry,Tracking and Command
关键词
载波同步
频偏估计
L&R算法
Rife算法
Carrier synchronization
Frequency offset estimation
L&R algorithm
Rife algorithm
