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! >> >> _______________________________________________ >> USRP-users mailing list -- usrp-users@lists.ettus.com >> To unsubscribe send an email to usrp-users-le...@lists.ettus.com >> > 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? > > > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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