Brais, Sam sent you a little bit the wrong direction there, the B200mini has the PLL phase noise issue that precludes use in a MIMO system. The B210 can be fully time and frequency locked to an external 10MHz reference and PPS. What is slightly tricky about using multiple B210’s in a MIMO configuration is that the internal frequency synthesizers will have a residual phase ambiguity after they have been configured, and this must be characterized and compensated for after any retune.
Watch this to gain insight into the issues involved: https://www.analog.com/en/education/education-library/webcasts/developing-multiple-input-multiple-output.html -Ian > On Dec 12, 2018, at 2:30 AM, Brais Ares via USRP-users > <usrp-users@lists.ettus.com> wrote: > > Thanks Sam! If I understand correctly the link that you refer to, it is > possible to obtain time and phase synchronization with B210s, so the only > issue would be to compensate phase offset which could be done by software. > Could you elaborate a little bit more? I'm probably missunderstading the > thread you link, but from it I take that MIMO implementations are possible > with B210. Also, can you provide any link for the difference between B210 and > N210 that allows to use the later but not the former? > > Regards, > Brais. > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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