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基于最大似然估计和Kalman滤波的BPSK载波同步方法

Keywords: 低信噪比,大多普勒频率变化率,载波同步,最大似然估计,Kalman滤波,二分法搜索

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Abstract:

针对低信噪比及大多普勒频率变化率情况下的载波同步问题,提出一种基于最大似然估计和Kalman滤波相结合的跟踪环结构.利用最大似然估计在低信噪比环境下准确估计载波频率和相位,并结合Kalman滤波对载波变化进行稳定跟踪.其中利用二分法搜索保证低计算复杂度的同时提高了估计精度.仿真结果表明了此载波跟踪环路良好的跟踪性能.

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