to design massive MIMO with 64 antennas in transmitter side
If you mean to simulate the array propagation, MATLAB has a toolbox to design phased array antennas, called "Phased Array System Toolbox".
You can have it from the following link.
https://www.mathworks.com/products/phased-array.html
There were some helpful white papers as well. But, if I recall correctly, it wasn't included with the university licenses.
Why do you want to use Simulink for this? What aspects is it that you want to simulate?
My Massive MIMO book can be download along with code on this website: http://massivemimobook.com
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