在初始阶段，首先需要对所仿真的MIMO无线信道的仿真场景进行选择。仿真场景是指典型城区、恶劣城区、郊区或者乡村等信道传播环境，以及通信的方向，即是上行链路还是下行链路-At the initial stage, first of all, the need for the simulation of the MIMO wireless channel selection simulation scenario. Simulation refers to a typical urban scene, poor urban, suburban or rural environment, such as dissemination channels, as well as the direction of communication, that is, uplink or downlink