Hi Alistu,
In the attached project file and m-file I made changes to create a working electrical output. I simply added a new “dummy” input with a random electrical sequence, which sets up a proper data structure that you can then modify with the M code. I set the output ports equal to this input and the simulation runs well.
Unfortunately, I do not think the OFDM component you wrote is working 100% because I do not understand the output.