[srsran-users] 回复: Could not set RX rate to 11.520 MHz. Actual rate is 11.703 MHz

[ZHUANG Yufan]

Dear Pablo

It seems that the sample rate in release_20_10 is 30.72e6. And the master clock of X410 is 245.76e6, which is 8 times of the sample rate.

Thank you for your help.

Sincerely
Yufan
________________________________
From: PABLO PICAZO MARTINEZ <papicazo at pa.uc3m.es>
Sent: Wednesday, May 29, 2024 8:22:55 PM
To: ZHUANG Yufan <yufan.zhuang at connect.ust.hk>
Cc: Xavier Arteaga <xavier.arteaga at srs.io>; srsran-users at lists.srsran.com <srsran-users at lists.srsran.com>
Subject: Re: [srsran-users] 回复: Could not set RX rate to 11.520 MHz. Actual rate is 11.703 MHz

Dear,

I set 20MHz for 5G with 23.04e6 sampling rate using B210 series. Probably you could be able to manually modify that sampling rate on srs code, but I have not gone through that procedure. Could you check the sampling rate used in rel 20_10? Probably that is multiple of your x410 master clock.

Regards,
Pablo

El mié, 29 may 2024, 12:18, ZHUANG Yufan <yufan.zhuang at connect.ust.hk<mailto:yufan.zhuang at connect.ust.hk>> escribió:
Dear Xavire and Pablo,

Thank you very much for your help.

May I ask how to check the running bandwidth of eNB? I use the default configuration file of eNB and PRB=50.

It seems taht the current version of srsran does not use the standard LTE rate even if I built with '-DUSE_LTE_RATES=ON'. Then I use release_20_10 and it works well with my device.

Sincerely,
Yufan
________________________________
发件人: Xavier Arteaga <xavier.arteaga at srs.io<mailto:xavier.arteaga at srs.io>>
发送时间: 2024年5月29日 17:16
收件人: ZHUANG Yufan <yufan.zhuang at connect.ust.hk<mailto:yufan.zhuang at connect.ust.hk>>
抄送: srsran-users at lists.srsran.com<mailto:srsran-users at lists.srsran.com> <srsran-users at lists.srsran.com<mailto:srsran-users at lists.srsran.com>>
主题: Re: [srsran-users] Could not set RX rate to 11.520 MHz. Actual rate is 11.703 MHz

Hi Yufan,
Are you running a 10MHz bandwidth eNb?

My comments:
- make sure it recompiles after setting `-DUSE_LTE_RATES=ON`;
- `base_srate=30.72e6` has no effect; and
- append `master_clock_rate=245.76e6` to the RF device arguments.

Kind regards,
Xavier

On Wed, 29 May 2024 at 09:49, ZHUANG Yufan <yufan.zhuang at connect.ust.hk<mailto:yufan.zhuang at connect.ust.hk>> wrote:
Dear team,

When I ran srsenb, I encountered the following warning and the srsenb cannot start.

[WARNING] [MULTI_USRP] Could not set RX rate to 11.520 MHz. Actual rate is 11.703 MHz
[WARNING] [0/DDC#0] The requested decimation is odd; the user should expect passband CIC rolloff.
Select an even decimation to ensure that a halfband filter is enabled.
Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 will enable 3 halfbands.
decimation = dsp_rate/samp_rate -> 21

I have added "-DUSE_LTE_RATES=ON" when building srsran, and added "base_srate=30.72e6" in the enb configuration file. My device is USRP X410.

It seems that my srsenb does not use standard LTE rate. How to set this?

I highly appreciate your help. Looking forward to your reply.

Sincerely,
Yufan
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