In the model communications system, the modulation process also is loaded the digital signal in the carrier scope value, the carrier frequency or on the carrier phase.

在典型的通信系统中，调制过程是数字信号加载在载波的幅度值、载波的频率或者载波的相位上。

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By digital simulation, the Ac carried wave system and its equivalent Dc system are checked and the feasibility of Dc method equivalent to the Ac carrier wave system is verified.

通过数字仿真，比较了交流载波系统和其等效直流系统，验证了交流载波系统等效直流方法的可行性。

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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。

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In 1993, NTT DoCoMo, Japan's principal mobile-phone carrier, opted for a technical standard called Personal Digital Cellular (PDC), which was incompatible with the Global System for Mobile Communications (GSM), the standard adopted by most of the rest of the world.

CNN: ASIANOW - TIME Asia | Phone Wars: Episode 3G