The bandwidth efficiency and ability to combat the effects of frequency selective channels are critical issues in the design of wideband wireless digital communications system.

在宽带无线数字通信系统中，影响信息高速传输的最主要的一类干扰是由信道的多径效应所引起的频率选择性衰落。

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The secure, high-capacity, jam-resistant wireless (non-satellite) system connects users with both digital data and voice communications.

这种安全、高容量、抗阻塞的无线（非卫星）系统通过数字数据以及话音通信使战场用户互连。

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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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Orcasub comes outfitted with sonar for collision avoidance, a digital long-range communications system and a 60, 000 lumen LED lighting rig.

ENGADGET

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

Employing approximately 190, 500 people in 206 offices across 68 countries, the company consists of nine independently operated business units: Visual Display, Mobile Communications, Telecommunication Systems, Digital Appliances, IT Solutions, Digital Imaging, Memory, System LSI and LCD.

ENGADGET: Samsung's Q3 2011 overall profit falls despite incredible phone sales