In the field of today's wireless communication, a new trend is the technology of direct RF modulation.

在当今无线通信领域中，一个新兴的结构趋势就是发射信号的直接射频技术。

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Smart antenna technology gave a solution for the increasing capacity and quality demands for mobile communication services without a corresponding increase in RF spectrum allocation.

智能天线技术可以在提高移动通信服务容量和质量的同时而不占用更多的频谱资源。

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This paper introduces a new Electronic Toll Collection (ETC) design, which adopts infrared wireless communication technology instead of RF wave communication.

介绍了一种新型的电子收费系统，利用红外光通信技术代替微波通信，在高速公路上实现全自动收费。

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