中文说明：
主要描述了MIMO-OFDM系统中的各项技术的介绍以及仿真代码，比如分集技术，无线信道模型、信道估计等。
English Description：
This paper mainly describes the introduction and simulation code of various technologies in MIMO-OFDM system, such as diversity technology, wireless channel model, channel estimation and so on