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I had a friend that worked in WiMAX on a project. He done the system in C++.
But if you don't have problems in working with working in MatLab/Simulink, I suggest you to use the existing OFDM (Orthogonal Frequency Division Multiplex) WiMax simulator of Communications Toolbox.
You'll find many information and projects done using google: type WiMax simulink or 802.16e standard.
I recommend you to also search in the File Exchange of Mathworks.