[srslte-users] Ouput power USRP-2901

[Taillefer Simon]

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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