通过简述多种调制方式中频信号数字产生的基本处理方法，提出了一种具体实施方案，并分析了其技术特点。
This paper discusses the digital generation method for communication IF signals and proposes a concrete implementation resolution and analyzes its technical characteristics.
有多种连接方式可供选择，因为标准中并未涵盖零调制解调器连接。
Several wiring layouts are in use, because the null modem connection is not covered by a standard.
无线光通信的调制方式有多种，但缺少综合系统的分析。
There are so many modulations of optical wireless communication, but it is very few of their systematic analysis.
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