Dear Damian,
I tried to execute the design “Direct Detection OFDM 4QAM “given in the samples. Here, When we upconvert the frequency to 7.5GHz then the center frequency should be 7.5GHz but as shown the RF spectrum does not gives the correct output. I have attached the RF spectrum output.
Besides, When I try to run the same design from the samples by generating single sideband modulation from MZM (Keeping the angle to 90 degrees), my EVM and BER is too high.
I guess there is some problem with the design in sample folders.