On 2021-10-18 12:40 a.m., Shamil Prematunga wrote:
Hi All,
I am a research engineer in Dialog-University of Moratuwa Research Lab
Sri Lanka who is new to USRP devices. I am currently working on an OAI
setup with N310 as a gNB and B210 as a UE.
When the setup is running I wasn't able to make proper communication
in between SDRs even over the air or through cables.
I tested using GNURadio and B210 working as a spectrum analyzer to
capture signals which are transmitted by the N310. It shows small
fluctuations around the center frequency when N310 is up and running.
Can someone who has experience with OAI and USRPs please help me to
figure out the problem.
Thanks in advance.
Best Regards,
Shamil Prematunga
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You haven't given us much to go on here--like what you mean by "small
fluctuations".
My suspicion is that you're just running into the fact that at the very
center of the spectrum is the DC component, and direct-conversion radios
have
a DC-offset compensator that can tend to alter signals right in the
middle of the spectrum.
The cure is usually to use offset tuning:
https://files.ettus.com/manual/structuhd_1_1tune__request__t.html#a292194827377ad0cef865b8b433b3ecd
To shift the DC offset component outside or to the edge of your passband.
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