本程序仿真一个从卫星到区域数据中心的下行链路（由一组6个载波构成），评估热噪声，交调（IM）失真、由滤波器造成的码间干扰（ISI）以及邻频干扰对下行链路性能的影响。-This procedure simulation of a regional data from the satellite downlink center (by a group of six carrier constituted) to assess the thermal noise, Intermodulation (IM) distortion, caused by the filter inter-symbol interference (ISI) and interference邻频on the downlink performance.