In a digital communication system, usually there exist carrier frequency offset between the sender and the receiver.
在数字通信系统中，发送端和接收端的载波往往存在一定的频差。
A digital communication system is introduced to replace analog system used in underground locomotive carrier communication system.
提出了在架线电机车载波通信系统中，用数字通信取代模拟通信方式。
Channel is a very important part of a digital communication system. The characteristics of the channel affect the performance of the whole digital communication system.
信道是通信系统的重要组成部分，其特性对于通信系统的性能有很大影响。
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