Because of the fading characteristic in troposcatter channel, the mechanism of traditional phase locked loop is difficult to achieve the effect in troposcatter communication.

由于对流层散射信道存在严重的衰落现象，故而传统的锁相环机制在散射通信中往往难以奏效。

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This paper gives an analysis of parasitic frequency deviation in the digital phase locked loop, which is one of the important specifications of modern communication systems.

本文分析了数字锁相环路的寄生频偏，它是现代通讯系统中频率合成器的重要指标之一。

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A novel all-digital phase locked loop (PLL), applied to the carrier synchronization of communication systems, is designed.

设计了一种用于通信系统载波同步的新数字锁相环。

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