[USRP-users] Interference Nulling with N200 and MIMO cable

Josh Blum josh at ettus.com
Thu Feb 2 04:09:12 EST 2012

On 02/02/2012 12:27 AM, Yubo Yan wrote:
> Hi,
>    I am working on implementation of interference nulling with USRP N200
> and MIMO-Cable. I config the first N200 device as MIMO master with:
> usrp->set_clock_source("internal",0);
> And config the second N200 device as MIMO slave with:
> usrp->set_clock_source("mimo", 1);
> usrp->set_time_source("mimo", 1);
> Finally I query the device with usrp->get_time_synchronized() , and it
> returns 1.
> But I can't achieve interference nulling with these configuration at last.
> My  question is:
> 1) Does above configuration synchronize two devices properly?


> 2) If I double that the two devices are not synchronized properly, how can
> I have a test just with at most four N200 devices?

You must share common 10 Mhz reference and PPS signal for two devices.


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