[srslte-users] Ouput power USRP-2901

[Neel Pandeya]

Hello Taillefer Simon:

The maximum output power for the USRP B200/B210 is approximately
between +10 and +18 dBm, depending on frequency and gain setting.

How exactly are you measuring the output power of your USRP B210?

Which version of UHD are you using?

https://kb.ettus.com/B200/B210/B200mini/B205mini

--Neel Pandeya




On Fri, 9 Apr 2021 at 07:21, Francisco Paisana <
francisco.paisana at softwareradiosystems.com> wrote:

> 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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