[srslte-users] Rank Indicator reported value

[Paul Matsagos]

Dear Xavier,

First of all thank you for your reply!
As I have understood from the srsLTE documentation, in order to achieve
MIMO in TM 4  the RI value should be "2" which means two layers where each
one of them transmits different signals.
With regard to the antenna placement, the best "κ" value that I could
achieve is "1.1".
I have attached the results of the pdsch_ue while I change the MCS value
from 0 to 21 as well as a photo of the antenna placement of the USRP (the
antennas are VERT2450):
https://drive.google.com/file/d/15hS0fskpp6fZhRsTUTKyxBWdvcsNBly6/view?usp=sharing
Looking forward to hearing from you and thank you in advance!

Kind regards,
Paul

Στις Παρ, 26 Ιουν 2020 στις 10:04 π.μ., ο/η Xavier Arteaga <
xavier at softwareradiosystems.com> έγραψε:

> Hi Paul,
> I see you are getting RI=0 (1 Layer), I guess you would like to have RI=1
> (2 layers).
>
> The examples pdsch_enodeb and pdsch_ue can help you tweaking antenna
> position.
>
> lib/examples/pdsch_enodeb -x 3 -p 50 -f 2650e6
> lib/examples/pdsch_ue -r 1234 -A 2 -f 2650e6
>
> The pdsch_ue provides the condition number:
>             κ: 0,0 dB, RI=1 (Condition number, 0 dB => Best)
>
> Kind regards,
> Xavier
>
> On Tue, 23 Jun 2020 at 16:23, Paul Matsagos <pavlosmats at gmail.com> wrote:
>
>> Dear Havier thank you for your reply!
>>
>> In the link below you will find the enb and ue log files:
>> https://drive.google.com/file/d/1SSz6c6YkzMnRlm0ed3zXQ1O753CW6uVs/view?usp=sharing
>> Thank you in advance!
>>
>> Kind regards,
>> Paul
>>
>> Στις Τρί, 23 Ιουν 2020 στις 8:34 π.μ., ο/η Xavier Arteaga <
>> xavier at softwareradiosystems.com> έγραψε:
>>
>>> Hi Paul,
>>> The PCAP does not provide CSI reports. Could you provide the enb.log and
>>> ue.log with PHY level in info?
>>>
>>> Kind regards,
>>> Xavier
>>>
>>> On Mon, 22 Jun 2020 at 17:23, Paul Matsagos <pavlosmats at gmail.com>
>>> wrote:
>>>
>>>> Hello everyone,
>>>>
>>>> My name is Paul and I am a master student in telecommunications. I am
>>>> using srsLTE in order to simulate a LTE network and measure the performance
>>>> of it for my thesis.
>>>> I am using two USRPs X300 (one for the eNB and the other for the UE as
>>>> well as a smartphone) and I have configured the enb.conf file for MIMO
>>>> transmission in TM 4. Because the computers in my university aren't fast
>>>> enough to support PRB higher than 25, when I am using the second USRP as a
>>>> UE, I have set the PRB to 15 and when I am using the smartphone I have set
>>>> it to 25. In both cases I don't lose packets because of the performance of
>>>> my machines.
>>>> Although the reported values of CQI, SNR, MSC and RSRQ from both eNB
>>>> and UE are optimal because the distance between the eNB and UE is 3 meters
>>>> with line of site, the RI have always the same value which is 1. I have
>>>> tried different combinations of tx_gains and rx_gains in both sides but the
>>>> RI value doesn't change. Can you please help me?
>>>> The following link have the configuration files (enb.conf, ue.conf) as
>>>> well as a file with measurements from both the eNB and UE and the .pcap
>>>> files:
>>>> https://drive.google.com/file/d/1baxO6KJGcAAwZLmjIjNDswfytwF2c1cQ/view?usp=sharing
>>>> Thank you in advance!
>>>>
>>>> Best regards,
>>>> Paul
>>>> _______________________________________________
>>>> srslte-users mailing list
>>>> srslte-users at lists.softwareradiosystems.com
>>>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>>>>
>>>
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