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

[PABLO PICAZO MARTINEZ]

Dear,

I believe that your master clock sample rate cannot achieve the RX rate you
are asking for.
In your case, you use 245.76 MHz /21 11.703. The next decimation achieves
11.17 so basically you can never achieve that sampling rate with that
image. You should change TX sampling according to your USRP rates.

Regards,
Pablo

"The USRP X410 has a few fixed MCR available for every image type: The 200
MHz images allow master clock rates of 245.76 MHz or 250 MHz. The 400 MHz
images allow master clock rates of 491.52 MHz or 500 MHz. Typically it is
sufficient to open a UHD session without the master_clock_rate argument as
UHD will pick a rate that fits the FPGA image loaded. If a non-valid MCR is
chosen, the session will error out."


El mié, 29 may 2024, 9:49, ZHUANG Yufan <yufan.zhuang at connect.ust.hk>
escribió:

> 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
> _______________________________________________
> srsran-users mailing list
> srsran-users at lists.srsran.com
> https://lists.srsran.com/mailman/listinfo/srsran-users
>
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