[srsran-users] Frequency offset on srsenb

[Christos Ricudis]

On Mon, Dec 12, 2022 at 6:27 PM Andrea Valori <
andrea.valori at innovatrieste.it> wrote:

> Hi everyone,
>
>
>
> at the page
> https://docs.srsran.com/en/latest/usermanuals/source/srsenb/source/3_enb_trouble.html
> is possible to read “It may be possible to use lab equipment or open source
> tools such as Kalibrate-RTL to estimate the CFO of your RF front-end and to
> manually compensate by setting small frequency offsets in the Downlink and
> Uplink carrier frequency settings of the eNodeB configuration file.”
>
>
>
> However, I did not manage to find a place where the frequency offset is
> set for the ENB part. For the UE I see the parameter (described here
> https://docs.srsran.com/en/latest/usermanuals/source/srsue/source/3_ue_trouble.html)
> but not for the ENB. Am I missing something?
>
>
>

On ENB side, you can set separately DL_EARFCN, DL_FREQ, UL_FREQ (UL_EARFCN
only depends on DL_EARFCN so you don't need to set it).

Example:

## BAND 1    2100       FDD  MIDDLE
dl_earfcn = 300
#dl_freq = 2140000000    # default value for band
#ul_freq = 1950000000    # default value for band
dl_freq = 2140022470      # corrected value by calibration factor
ul_freq = 1950020475      # corrected value by calibration factor

You might have to play around with gain and frequency adjustments till you
get it right. Also keep in mind that only dl_freq or ul_freq might need
adjustment, so you have to try all combinations, if you don't have a signal
generator / frequency analyzer handy.
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