Am ofdm signal, which is generated in python, presents a peak in the central part of the spectrum when seen in the spectrum analyzer. What could it be?
I change the amount of pilots, guard band data carrier and number of bits in modulation (bpsk, 8QAM, etc).
I am using a USRP x310 and a HackRF one for transmission and same behavior happen. I have written my own code as well using pyphysim library.