How so? As Marcus said, two radios with independent oscillators will
phase-drift against each other during operation.
On 8/15/23 10:23, Ali G. Dezfuli wrote:
Thanks Marcus,
They work continuously up to not having any dample drift caused by
sampling clock offset
On Tuesday, August 15, 2023, Marcus D. Leech <patchvonbr...@gmail.com>
wrote:
On 15/08/2023 05:43, Ali G. Dezfuli wrote:
Hi all,
I have two transceivers A and B each one is connected by
cables to a USRP B200mini (TX/RX for send and RX2 for receive)
Using GNU Radio, for each iteration, transceiver A starts to
send a burst of RC-filtered, BPSK-modulated PN sequence.
Side B waits for the burst and as soon as it gets that (by
correlation), detects the
phase ramp (because of the carrier frequency offset (CFO)) on
the PN symbols
and makes a new burst with the same phase ramp, and sends its
burst back to side A.
Then I observe the phase of the received symbols at A.
As far as there is no sample loss/insertion, I suppose the
phase continuity is held and
should receive a constant phase on the received symbols at A
whose value depends
on the delay between A and B which is fixed.
I observe these issues:
1- in some iterations, the received phase at A is not fixed.
2- in some iterations, the received phase at A is fixed but
does not equal other iterations.
Would be grateful if anyone could help me with this.
Thanks!
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You haven't noted whether the two USRPs are syncrhonized or not.
Two radios that are not synchronized to a common clock will NOT
have mutual phase-coherence over any
non-trivial interval.
Are you running RX continuously, or starting/stopping streams?
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