This paper deals with a digital speech communicator of very low frequency and low bit digital communication based on software ratio, which USES the technique of QPSK and FEC coding.
本文论述了一种基于软件无线电的甚低频低码率语音数字岩层通信机，它采用了QPSK调制和FEC信道编码技术。
Cellular capabilities can be added later with the digital cellular communicator plug-in expansion card.
蜂窝性能可以用数字蜂窝通信插件扩展卡添加。
Cellular capabilities can be added later with the digital cellular communicator plug-in expansion card.
蜂窝性能可以用数字蜂窝通信插件扩展卡添加。
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