[srslte-users] MIMO and srsUE

[Ismael Gomez]

Hi Andres,

Have you set nof_rx_antennas=2 in the ue.conf?

On Thu, 19 Oct 2017 at 16:51 Andrés García Saavedra <
andres.garcia.saavedra at gmail.com> wrote:

> 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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