[srslte-users] TX Power and Signal Power received at UE

[Rúben Queirós]

Good Afternoon,

First of all thank you for developing srsLTE. I'm currently researching 
to my MSc degree and i'm using srsLTE to evaluate the performance of 
different SDR hardwares namely, BladeRFx40, BladeRF micro 2.0 and USRP 
B210 The antennas used are TriBand from Nuand. For the UE i'm using a 
commercial Samsung J7 that connects sucessfully to the srseNB and 
srsEPC.

I've been using the software for a couple months already and i'm running 
out of options so i'm writing you this e-mail hoping that you can help 
me with my problem.

Im transmitting in Band 3, 7 and 20, Central frequencies, switching 
between NRBs ( from 15 up to 50 sucessfully ) and according to some LTE 
Throughput Calculators, the results are way lower than the expected at 
Low range ( 1 Meter between the eNB station and UE ). After logging the 
Signal Power Received at the UE, i realised the signal power is way 
weaker than it should be.

Assuming the information in 
https://www.pasternack.com/t-calculator-friis.aspx is correct, and 
considering no antenna gains in RX or TX, i should be expecting


Tx Power   1m ( range)	  2600 MHz	 1800 MHz	 800 MHz
8dBm	   Blade Micro	-32,75 dBm	-29,55 dBm	-22,51 dBm
6dBm	   Blade x40	-34,75 dBm	-31,55 dBm	-24,51 dBm
10dBm	   USRP B210	-30,75 dBm	-27,55 dBm	-20,51 dBm

However the values im getting are between -70 to -95 dBm. This tests 
were done with LOS between the eNB and the UE and i've noticed the 
software always sets the TX Gain of the RF hardware to the max, yet it 
is still a weak signal.
I will attach an example of an enb.conf used in one of this tests. If it 
is not enough to detect the problem, i also attach the other logs i 
capture for the same test performed.

Thank you in advance!
Ruben Queirós
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