For wireless digital communications, digital user signal is usually at first converted into analog domain and then modulated to radio frequency by one or two steps.

对于无线数字通信而言，通常将数字用户信号首先转换到模拟域中，然后通过一个或两个步骤将其调制到无线电频率。

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Recently, frequency-hop communication has been widely used in many military wireless communication domain as a secure transmission mode.

近年来，跳频通信技术作为一种抗干扰、抗截获、抗检测的安全传输方式已广泛应用在各种军事无线通信领域。

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Marconi 's leading position in the access domain results from its successful acquisition in the past time and its rich experience in the fixed and wireless technology.

马可尼公司在接入领域的领先地位得益于它在过去一段时间内的成功收购以及在固定和无线技术方面积累的丰富经验。

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Fixed cellular and wireless-loop technologies are enabling cellular companies to effectively encroach upon the territory that was once the exclusive domain of fixed-line operators.

CNN: Cell-Phones On the Line