The system uses time-frequency tracking loops to extract phase errors from data subcarriers with frequency interpolation to compensate for the estimated carrier frequency offsets.
该方法使用了时频同步跟踪环路，从数据子载波提取相位误差，并利用频域插值补偿多个用户的估计频偏。
2
It also give an improved method for PLL (phase locked loop) to extract coherent carrier.
本文还对相干载波提取中的锁相环提出了一种改进方法。
3
This algorithm can extract the watermark without the original carrier image and the original watermark image.