[srslte-users] MIMO and srsUE

[Andrés García Saavedra]

Hi all,

We are trying to test the 2x2 MIMO setup of srsUE and we are having issues.

We are using the latest code from the git repository (up to today). We are
using an USRP b210 for srsUE and a commercial LTE base station from
spidercloud Wireless. We are using plain air in band 7 (which we have a
licensed for).

If we plug in 2 antennas on one RF Chain A of the USRP the attachment works
well and we achieve around 70Mb/s of downlink throughput as expected for a
SISO setup. UE log can be found here
<https://www.dropbox.com/s/xttw1s8wg4pkg7l/ue-1RX%20antenna.log?dl=0>
(there is an error notifying that TM 3 is not supported by the UE which is
expected as we dont have antennas on the RF chain B).

If we now add 2 more antennas to RF Chain B and repeat the process we have
plenty of "Sync error. Sending out-of-sync to RRC" messages and therefore
the attachment procedure fails, as shown in the ue.log file here
<https://www.dropbox.com/s/d7xutmasglirk22/ue-2RX%20antenna.log?dl=0>.

Somebody has experienced a similar problem or have some suggestion?

Thanks!
Andres
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