Autofocus generally encompasses two distinct steps, i. e. phase error estimation and phase error compensation.
自聚焦主要由两个重要步骤组成，即相位误差估计和相位误差校正。
A phase error model, in which the time synchronization error, frequency synchronization error and motion error are considered, reveals the sources of phase errors.
同步以及运动误差会引入相位误差，本文中提出了相位误差模型。
The phase error estimation part utilize one pilot tone to track the phase error and uses the estimation after compensation structure to improve precision.
残留相偏估计部分采用利用导频进行相偏跟踪的方法，并采用补偿后估计的结构来增加估计的精度。
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