Can u explain me simple communication in mimo system<Matl

[mazdaspring]

Hi, Could anyone explain to me MATLAB code on some simple communication in MIMO system. There are a few matlab code available online but there is no explanation or it's very complex so I do not understand. Some of them contains many (sub) files (i mean many functions code) and I don't know how to combine it and run the whole program.

Can you please give me some example and explain to me how to apply mimo system in MATLAB. I need to understand the code and how it works.

Thank you for your kindness