说明：  本文通过建立基于OFDM技术的DVB调制与解调模型，仿真分析了信号通过理想信道和加性高斯白噪声两种信道下的情况，可以证明OFDM系统具有内在的适应性，能够适应高斯信道，各子载波相互正交，所以扩频调制后的频谱可以相互重叠，不但减小了子载波间的干扰，还大大提高了频谱利用率。
(In this paper, the DVB modulation and demodulation model based on OFDM technology is established. The simulation results show that the OFDM system has inherent adaptability and can adapt to the Gaussian channel. The subcarriers are orthogonal to each other, so the spectrum after spread spectrum modulation can overlap each other, which not only reduces the interference between subcarriers, It also greatly improves the spectrum utilization.)