Dear usrp-users,
I am working with a USRP X410 model to receive OFDM signals on all four
channels. I am also using a ULA as my radiating elements (antennas). From the
received signal, I wish to acquire AoA information based on the phase of the
channel estimates that I compute from the received known OFDM symbols.
My first question is: must I set up a phase calibration procedure manually,
like this application note
<https://kb.ettus.com/Synchronization_and_MIMO_Capability_with_USRP_Devices>
suggests, to calibrate the phase offsets between all four Rx channels? Or does
the X410 have a built-in procedure that can calibrate the phase offsets between
channels?
Second: can someone explain to me which parts of the RF frontend cause the
phase offset between channels? I have so far tried to understand the frontend
based on the ZBX circuit diagram <https://files.ettus.com/manual/page_zbx.html>.
Third: can someone point me to resources that present an implementation for a
manual phase calibration procedure for the X410, if needed?
I appreciate any help or shared experiences on this matter.
Best regards,
Frederik
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