[srslte-users] Range of srsLTE over the air with USRP B205mini-i

[Ashwin Panicker]

Hi John,
Thank you for the information. I am using VERT2450 antenna from Ettus
Research. https://www.ettus.com/all-products/vert2450/  .
I have also tried with the below combination of antennas, but with similar
issues. Max. throughput (~ 60 Mbps) is achieved at about 10 cm while
running iperf3, but as I move the UE further, throughput drops to 0
immediately.

Antenna(UE)

Pharad/Octane Wireless

SA-1400-5900

Antenna(eNB)

Mobile Mark

RM-WB1-DN-BLK
  I am setting the txgain and rxain to 85dB, but keeping the antennas close
by. I will try with your suggestion.

Thank you,

Best,
Ashwin Panicker



On Thu, Feb 20, 2020 at 7:46 PM john wu <john.wu.8899 at hotmail.com> wrote:

> Hi,
> i have tested B210 achieve good throughput in about 1 meter. then increase
> the distance the throughput drop.
> i think B205mini have the same rf performance as b210.  for the TX gain i
> think you can set it as 86db, if larger than 86db the evm become worse. for
> RX gain you can set to max. what kind of antenna you are using? i know
> B205MINI TX and RX port is very close if your antenna stick on the sma port
> then can not achieve enough isolation. you can use the antenna with cable
> and put TX and RX distance about 0.5m.
>
>
> www.zhixun-wireless.top
> provide SDR PA LNA duplexer
>
> Best Regards
> ------------------------------
> *From:* srslte-users <srslte-users-bounces at lists.softwareradiosystems.com>
> on behalf of Ashwin Panicker <ampanick at ncsu.edu>
> *Sent:* Thursday, February 20, 2020 8:07
> *To:* srslte-users at lists.softwareradiosystems.com <
> srslte-users at lists.softwareradiosystems.com>
> *Subject:* [srslte-users] Range of srsLTE over the air with USRP
> B205mini-i
>
> Hi everyone,
>
> I am trying to find the maximum range over which iPERF can be run with
> srsLTE over the air with two USRP B205mini-i. Has anyone tried it before?
> If so what is the maximum range achieved? and what are the txgain and
> rxgain settings of UE and eNB?
> When I try to do it, I am getting Radio Link Failure often. It starts with
> good throughput initially, but after sometime , it falls to 0 Mbps with
> Radio Link failure message.
>
> Thanks.
>
> Best,
> Ashwin Panicker
>
>
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