中文说明：
仿真实现接收信号并进行数字下变频处理，并进行了滤波，实现了降采样率的处理过程。
English Description：
The received signal is simulated and processed by digital down conversion, and the filtering is carried out, and the processing process of down sampling rate is realized.
Receiving signal and digital down conversion processing (DDC)
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中文说明：
仿真实现接收信号并进行数字下变频处理，并进行了滤波，实现了降采样率的处理过程。
English Description：
The received signal is simulated and processed by digital down conversion, and the filtering is carried out, and the processing process of down sampling rate is realized.
DDC_1.m