In phase-coherentcommunicationsystem, phase-locked loop is always used to yield coherent reference signal.
相位相干通信系统中，通常采用锁相环路来产生相干参考信号。
2
A new experimental system of coherent optical communication is recently accomplished at the Guilin Institute of Optical Communications in China.
一种新型的相干光纤通信实验系统最近在桂林激光通信研究所完成。
3
A scheme of satellite covert communication based on the coherent chaos shift keying signal is proposed in this paper, then the whole system model is also constructed.