[srslte-users] srsUE 2x2 MIMO using USRP X310

[Yuda Feng]

Hi Andre and the community,

Sorry for the late reply. I spent a few days modifying my code to make it
work with the latest release of srsLTE. I found the same sync issues as I
debugged on release 18.12.

The PSS Correlation peak is always smaller than the threshold with two
antennas. In the *sync.c* file, *srslte_sync_find function*
<https://github.com/srsLTE/srsLTE/blob/45486b6e2c622ab1d47906521662f087816d7d03/lib/src/phy/sync/sync.c#L713>,
when I use one antenna, the PSS correlation peak can be greater than 10
(the threshold is 3), but with two antennas, it' s always smaller than 2. I
was stuck here.

I found there is some bug when X310 two antenna, the subframes are not
divided properly and thus the PSS correlation becomes a mess.

Thanks for any help you can provide.

Sincerely,
Yuda

On Sun, Feb 7, 2021 at 5:53 AM Andre Puschmann <
andre.puschmann at softwareradiosystems.com> wrote:

> Hi Yuda,
>
> we know of people using the X310 with 2x2 MIMO yes, although I am not
> entirely sure which srsLTE version their solutions is based off.
>
> But for your setup/issue, could you please try with the current stable
> srsLTE 20.10.1 and post logs, stdout, etc. when things don't work as
> expected?
>
> Thanks
> Andre
>
>
> On 7/2/21 4:21, 冯 宇达 wrote:
> > Hi srsLTE community,
> >
> >
> >
> > Is srsUE supporting 2x2 MIMO on USRP X310 in the latest release?
> >
> >
> >
> > I found the example config file suggest USRP B210 for 2x2 MIMO. But I
> > only have X310. I have tried the 18.12 release, it can only work with
> > USRP X310 one antenna. I found the issue is, when receiving using two
> > antennas USRP X310, the received signal can not be synchorinized
> > properly and the subframes are not divided properly.
> >
> >
> >
> > Since the 19.3 release, the phy library is refactored. Does it solve the
> > issue? Has anybody tried 2x2 MIMO on USRP X310 with any release since
> 19.3?
> >
> >
> >
> > Thank you for any help and suggestion.
> >
> >
> >
> > Yuda
> >
> >
> > _______________________________________________
> > srslte-users mailing list
> > srslte-users at lists.softwareradiosystems.com
> > http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
> >
>
>
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