Hi Marcus, Thanks!
I feel a little confused about the term 'frequency synchronization'. if the two LOs on the two daughterboads are using the same frequency reference, does it mean that after tuning, they will produce identical CFOs to the same receiver (one receiving channel) or we can say that the difference in CFOs are almost negligible? (lets for now ignore other factors that can contribute to CFO) I read through 'align LOs in the front-end' in the link https://files.ettus.com/manual/page_sync.html. timed command makes sure that different daughterboads can be tuned at the same time, so that it can only help to mitigate the phase offset, but it doesn't say anything about the potential frequency offset between the two daughterboards. Best, Yang On Wed, Jan 9, 2019 at 3:17 PM Marcus D Leech <patchvonbr...@gmail.com> wrote: > Yes they’ll use the same reference clock provided by the motherboard. > > There’ll be a residual phase offset which can be mitigated using timed > tuning. > > Sent from my iPhone > > > On Jan 9, 2019, at 3:01 PM, Yang Liu via USRP-users < > usrp-users@lists.ettus.com> wrote: > > > > Dear all, > > > > I have a usrp x310 with two UBXs installed. And I want to use it as a > MIMO transmitter (two outgoing channels streaming at the same frequency). > > > > When we need to build a MIMO system by connecting different usrps, I > know that we need to have either MIMO cable or external time and frequency > reference. In the one usrp x310 case, since two daughterboards seems to be > independent, do we need to synchronize them? or they are already > synchronized by default (for example, two local oscillators are > synchronized, and will be tuned to exactly same frequency?)? > > > > Thanks, > > Yang > > _______________________________________________ > > USRP-users mailing list > > USRP-users@lists.ettus.com > > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
_______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
