基于判决反馈的 CPM 信号定时相位联合估计算法

摘要

A joint timing and carrier phase estimation algorithm is proposed for the synchronization problem of CPM (Continuous Phase Modulation) based on decision data. In light of PAM (Pulse Amplitude Modu-lation) disintegration of CPM signals, timing error and phase error function are deduced from the maxmum likelihood function, and then the estimated timing and phase value is recovered by iteration computation. Firstly, synchronization information is rapidy captured according to the unique code of signal frame, and then the timing and phase error tracked with decision-direct method. Simulation results indicate that the proposed algorithm is close to MCRB in performance while enjoys low operation complexity in nature and easy implementation for engineering.%针对连续相位调制(CPM)信号同步问题，提出了一种基于数据辅助联合直接判决的同步算法。该算法基于 CPM 信号的 PAM 分解，利用最大似然函数推导出定时和相位误差函数，并迭代求解恢复出定时和相位信息。首先根据信号帧中独特码实现同步信息的快速捕获，然后运用直接判决后反馈迭代的方法进行定时和相位信息的跟踪。仿真结果表明，文中方法的性能逼近 MCRB 界，同时运算复杂度小，便于工程实现。