[srslte-users] AGC Mode

[Charbel Lahoud]

Hi Xavier,

Thanks a lot for your email.
I have work it out by modifying the AGC parameters as you mentioned (AGC_HOLD_COUNT = 200 or 300; AGC_DEFAULT_TARGET = 2.5). While the system is stationary, it works well but while UE is moving the performance drops again resulting in high BER.
Any suggestions?
Thank you.

Best regards
Charbel

From: Xavier Arteaga <xavier at srs.io>
Sent: Tuesday, August 17, 2021 8:19 AM
To: Charbel Lahoud <charbel.lahoud at etit.tu-chemnitz.de>
Cc: srslte-users at lists.softwareradiosystems.com
Subject: Re: [srslte-users] AGC Mode

Hi Charbel,
Many thanks for your email. You could try the following:
- It could be the gain setting is slow, could you try increasing SRSRAN_AGC_HOLD_COUNT to >100;
- Lower SRSRAN_AGC_DEFAULT_TARGET

Regards,
Xavier

On Mon, 16 Aug 2021 at 16:07, Charbel Lahoud <charbel.lahoud at etit.tu-chemnitz.de<mailto:charbel.lahoud at etit.tu-chemnitz.de>> wrote:
Hi,

Recently, I have been testing using srsRAN AGC mode. I have recognized that on srseNB and srsUE, the AGC mode isn’t working properly.
While AGC is enabled, the RSRP is changing a lot and I have a high BER. On the other hand, while specifying the RX gain on both eNB and UE, I am able to reach max performance.

I am using USRP N321 with UHD 3.15 LTS on both sides eNB and UE. As well, I have modified the max gain inside AGC.c  to 60.0 and increased the number of measurements, but still getting the same results from high BER and low performance.

Any suggestions will be helpful. Thanks a lot.

Best regards,
Charbel
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