It's the DC offset of the direct conversion transmitter. With the X310,
you can move it out of the signal with a tune_request(). You can move
the spike up to 1/2 the sample rate in either direction. Here's an
example at 6.912 Msps.
uhd.tune_request(center_freq, 3400000)
ATSC 3.0 OFDM
This is why newer standards like 4g and 5g don't use the central carrier.
Ron
On 2/22/24 17:51, Pedro Vieira wrote:
An ofdm signal, which is generated in python, presents a peak in the
central part of the spectrum. What could it be?
This same behavior appears on USRP X310 and HackRFOne.
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