[srslte-users] x300/X310:Poor UL SNR

[Bilal Maqsood]

Hi Venu,

I will suggest you to set the tx_gain value in enb.conf to 30 and rx_gain
you can keep between 30 to 40.

I have done the Tx power output measurement test with x-310 and found that
the output power remain constant after tx_gain of 30 or 31. However, alot
of interference is generated if you keep very high Tx_gain which might
affects the SNR.

I will suggest if you have a spectrum analyzer than attach the Tx of X-300
to the spectrum and see the output with different gain settings.

Thanks and regards
Bilal


From: Venu Vennapusa
Sent: Thursday, June 13, 2019 5:44 PM
To: srslte-users-bounces at lists.softwareradiosystems.com<mailto:
srslte-users-bounces at lists.softwareradiosystems.com>
Subject: x300/X310:Poor UL SNR

Hi Team,

  I was testing USRP X300/310 with COTS UE, as part of this I observed poor
UL SNR i.e.., <10dB, some times it is as low as 2 to 3dB.I did not see this
issue with USRP b210 boards.

I did play with rx_gain settings ( 30 to 130 ), but I did not notice much
improvement. Any ideas/help here is much appreciated.

X300 config:
25 RBs
Hyperthreading disabled
10GB ethernet link between Host and USRP
Band7 UE
UEs: Samsung S7 and Fire phone

Thanks and Regards,
Venu
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