Hi Jakub - 2 possibilities, depending on how one interprets your
question:
A) If what you mean is "using a single host computer that controls the
two USRPs such that one transmits while the other receives and vice-
versa, but never a single USRP both Tx and Rx simultaneously", then
yes, that can be done; you could probably even use two host computers
that sync the Tx/Rx in a MAC-like way using the current GNU Radio
software, so long as each USRP is not trying to do simultaneous Tx and
Rx. If using a single host computer: on each USRP, you'd use
set_auto_tr(true) and then control both USRPs from the same Python
script. My colleague Glenn has done this in a "TDMA fashion" to
compare properties of actual and theoretical relays; see his MS thesis
and related paper at UND < http://www.nd.edu/~jnl/group/glenn-
bradford/ >.
B) If what you mean is "simultaneous Tx/Rx on each USRP, using a
single RFX and single antenna", then this problem is (1) possibly not
do-able in the current state of GNU Radio software and USRP hardware;
and (2) even if it is do-able, certainly not easily so in GNU Radio
software without significant hacking to make it work. The primary
issue is in jointly estimating the channel parameters (both the Tx ->
Rx delay and filter coefficients), which might be time-varying or
dependent on qualities beyond the direct TX signal. I'm happy to
discuss this interpretation further off-list.
Hope this helps! - MLD
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