说明：  模拟OFDM体制的数字电视信号DVB-T的接收全过程，包括下变频、D/A转换、滤波、星座解调等。。。很实用！
(Simulated OFDM system, DVB-T digital TV signal reception of the entire process, including down-conversion, D/A conversion, filtering, demodulation and other constellations. . . It works!)