摘要
前向载波频偏估计算法的捕获范围和估计精度是一对矛盾。针对这一问题,提出一种低计算复杂度的宽范围高精度前向载波频偏估计算法。算法的基本思想是:首先,利用相邻码元判决点处的相位差粗略估计载波频偏,以便获得宽的捕获范围;然后,利用高时延自相关函数精细估计载波频偏,以便获得高的估计精度。详细描述了算法的数学表达,并对其性能进行了分析。最后的仿真数据证明,该算法对于载波频偏的宽范围高精度估计,确实具有较高的实用价值。
Between Capturing-range and estimation accuracy of feedforward carrier frequency offset estimator is a contradiction. In order to solve the problem, a feedforward carrier frequency offset estimator with wide range, high accuracy and low-complexity was proposed. First, wide Capturing-range was obtained by using short delay correlation funtion, then high estimation accuracy was obtained by using long delay correlation funtion. The algorithm was described in detail. Performance of the estimator was discussed. Simulation results prove its practicability.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2008年第18期4968-4970,共3页
Journal of System Simulation
关键词
短突发信号
前向结构
载波同步
频偏估计
相位折叠
short burst signal
feedforward structure
synchronization frequency
offset estimation
phase wrapping
