In phase-coherent communication system, 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。

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In phase-coherent communication system, 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。

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