Is someone here using two USRP N210 with MIMO Cable for Uplink decoding?

[andre2...@gmail.com]

Is someone here using two USRP N210 with MIMO Cable for Uplink decoding?

[andre2...@gmail.com]

Hello!

I connected two N210 with the MIMO cable and configured the UHD USRP Source as described by the ettus manual.

But only DL messages appears.

Can someone please help me and take a look at the following flowgraph?

https://mega.nz/#!oUMTAAyC!OVtd5WvFp3OQHDutKf1xQXb9KsbCoyrM8kCqEF_VFBg


I am thankful for any help!

Bye,,,

[Piotr Krysik]

W dniu 12.01.2017 o 01:55, andre2...@gmail.com pisze:

Hi,

I would encourage you to first register the data to files (without any
processing) and then process it. I haven't yet tested live processing of
uplink and downlink.

The synchronization of USRPs the way you did it looks ok.

What doesn't look good in the flowgraph is that you use the same RF gain
for uplink and downlink. If you register signal from nearby phone (your
own) then such high gain that you set might lead to saturation.

--
Best Regards,
Piotr Krysik

[andre2...@gmail.com]

Hi Piotr,

I already tried to record the data without any processing, it did not make any difference.

But the hint with the high gain for the ul is good, i will try it later and will tell if it worked.

Thank you!

[andre2...@gmail.com]

too bad, changing the gain did not help.

sometimes i get this error message;

UHD Error:
    The receive packet handler failed to time-align packets.
    67936 received packets were processed by the handler.
    However, a timestamp match could not be determined.
gr::log :WARN: gr uhd usrp source0 - USRP Source Block caught rx error code: 12

Any idea?

[Gökhan Güven]

I am getting the same error. I wrote a gnuradio program by connecting two N210 SDRs with a MIMO cable. The program works until I get the same error at random times. Have there been any changes in your case? I would be appreciate if you help me.

12 Ocak 2017 Perşembe tarihinde saat 23:51:47 UTC+3 itibarıyla andre2...@gmail.com şunları yazdı: