[USRP-users] Sync two USRP devices to sense 100MHz of spectrum

Derek Kozel derek.kozel at ettus.com
Thu Nov 9 09:34:34 EST 2017


Hello Wahhab Albazrqaoe,

It is certainly possible to configure each USRP to be tuned to a different
frequency and to be synchronized closely in time. A 1 Gigabit Ethernet
connection can carry approximately 25 MS/s of 16 bit samples and 50 MS/s of
8 bit samples. We do not support sending 4 bit samples so it is not
possible to carry 100 MHz worth of spectrum over the 1 GigE cable of an
N2x0 or USRP2. You should operate in Dual Ethernet mode using the MIMO
cable to share clock and time references. If you already have external 10
MHz and 1 PPS references that you can send to both then the MIMO cable
gives you little benefit in this situation.
http://files.ettus.com/manual/page_usrp2.html#usrp2_mimocable

You will be limited to 8 bit samples so you should check that you
application will be ok with that limitation. Newer USRPs use faster
connections such as USB 3 and 10 Gigabit Ethernet to pass higher resolution
samples at higher rates.

Regards,
Derek


On Thu, Nov 9, 2017 at 2:07 PM, Wahhab Albazrqaoe via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Dear All,
> We would like to sense (i.e. sample) 100 MHz of 2.4GHz spectrum. My idea
> is to connect 2 USRPs (USRPN200 and USRP2) via a MIMO cable (available at
> ettus.com). Then, we configure each USRP separately to monitor 50MHz of
> bandwidth (8bit per sample).
>
> My question:
> 1- is it possible to configure each USRP separately to monitor different
> spectrum segment? Example, USRPN200 senses 2400MHz to 2450MHz and USRP2
> sense 2450MHz up to 2500MHz.
> If this is possible, is it possible to get the samples over one GigaBit
> Ethernet cable (i.e. connected to one USRP device)? Or we may need to take
> a cable out of each device and connect them to a switch, which feeds the
> host ?
>
> 2- is it possible to connect USRPN200 with USRP2 via a MIMO cable? Or we
> need to use two USRP devices of the same type? like two of USRPN200 or two
> of USRP2.
>
> Thanks
> Wahhab Albazrqaoe
>
> _______________________________________________
> USRP-users mailing list
> USRP-users at lists.ettus.com
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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