中文说明：这是我刚刚写的上下变频的完整的代码，包含了整个的通信的qam 映射，成型根升余弦滤波，cic ，半带滤波，发射，下变频的过程。大家根据输出的图形，可以很形象的理解整个数字系统的过程。希望对从事这方面研究的数字信号处理的，提供入门的学习资料。
English Description：
This is what I have just written down and down the full code, including the entire communication QAM mapping, shaped root raised cosine filter, CIC, half band filter, emission, down conversion process. According to the output of the graphics, can be very image of the process of understanding the entire digital system. Want to engage in research in this area of digital signal processing, to provide entry learning materials.