中文说明：
DVB-T，DTMB简化的信道仿真程序。设置了三种保护间隔：循环前缀、零添加、伪随机添加。用于研究不同保护间隔下的SNR特性，附带一个不同保护间隔下的频谱显示，可看出三种保护间隔对OFDM频谱陡峭程度的影响。
English Description：
DVB-T, DTMB simplified channel simulation program. Three protection intervals are set: cyclic prefix, zero addition and pseudo-random addition. It is used to study the SNR characteristics under different guard intervals, with a spectrum display under different guard intervals. The influence of three guard intervals on the steepness of OFDM spectrum can be seen