[srslte-users] Ouput power USRP-2901

[Francisco Paisana]

Hey,

Regarding the MCS, I believe you can either set a maximum MCS or a fixed
MCS in the enb.conf. See the parameters "pdsch_mcs", "pdsch_max_mcs",
"pusch_mcs", "pusch_max_mcs".

For the bandwidth, I don't think that changing a UE's DL grant bandwidth
will affect the maximum DL tx power. For the UL, our eNB will only support
UL power control and PHR handling in the upcoming release, so changing the
bandwidth will not have a noticeable impact, I believe.

With regard to the USRP tx power, maybe some other users on the mailing
list can help.

Kind Regards,
Francisco


On Fri, Apr 9, 2021 at 11:35 AM Taillefer Simon <
simon.taillefer at telespazio.com> wrote:

> Hello srsLTE team,
>
>
> We are encountering an issue regarding the ouput power of the SDRs we are
> using between the ENB and the UE.
>
>
> We are using 2 laptops with 2 USRP-2901 from National Instrument on what
> we flash the firmware of the USRP B210 when running srsENB and srsUE using
> UHD.
>
>
> The maximum output power from the NI documentations is +15dBm but in our
> case, the maximum output power we can achieve is around -60dBm that allow
> us to have around 10 meters of range between the two USRPs. In the conf
> files. the TX and RX gains are already at the maximum value (respectively
> 89 and 40 dB).
>
> So do you know how we can manage to have more output power from our USRPs?
> Is there a limit in the code of file conf that does not allow the USRPs to
> work at their maximum output power? Our goal is to achieve at least -30dBm.
>
> Also, how can we set the modulation to only BPSK or QPSK instead of QAM?
> We saw that it is maybe possible to fix the MCS index? And can we decrease
> the bandwidth to maybe have more power?
>
> Thank you for your help,
>
> Simon Taillefer
>
>
>
>
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