Simple OFDM path


I am new to GNU Radio and I tried a simple OFDM simulation, using a OFDM
mod and demod in GNU Radio Companion.

The source is a binary source as you can see in the img.

I can see the OFDM signal in the FFT after the modulation. I also can
see the binary signal in the left scope sink after some seconds. But I
can’t see the signal after the OFDM demodulation.

I am new to this so probably I am missing something. I tried this same
graph with a GMSK mod/demod and it worked

Thanks for your help in advance