On 26/06/2023 09:32, Arhum Ahmad wrote:
Thanks for the response,
1. I am using UBX 10-6000 MHz
Rx/Tx(https://www.ettus.com/all-products/ubx40/)
2. Yes, I am using AGC for the processing part. The parameter values I
have uses are
- DesiredPower: 2
- AveragingLength: 50
- MaxPowerGain: 60
3. I have checked the spectrum of the signal in a
separate spectruHm analyzer, there is NO change in the spectrum as I
vary the gain.
Assuming you have a complete UHD installation, you can use the
tx_waveforms example app to check this as well. Since you're
using MATLAB, I cannot help with that aspect.
On Mon, Jun 26, 2023 at 2:58 AM Marcus D. Leech
<patchvonbr...@gmail.com> wrote:
On 25/06/2023 16:49, Arhum Ahmad wrote:
Respected sir,
I am using N-200 USRP for transmitting a signal. While
transmitting, I havechangedthe Gain value in the SDRutransmitting
block, but my signal strength at the receiver remains the same. I
also stop and restart the code but the change in gain does not
affect the received signal. I have tried the changing gain via
both available options i.e., input port and dialog, but it seems
to have no effecton the receiver. The signal strength at the
receiver remains the same. I have tried 30 dB(Maximum gain) to 0
dB (minimum gain) in both cases received SNR is the same(i.e.,15
dB). I am using a wireless connection in line-of-sight, with
minimum Tx gain at least a fewdropsin SNR should be observed. I
have also tried -50dB (just checking) but noeffect in the SNR is
observed. The same thing I havetried using B210 as Tx, Rx signal
strength does change in this case. However, while using N-200,
noeffect of changing the gain value is observed.
Somehow gainvalue is fixed in N-200 while using the MATLABSDRu
block. Can you PLEASE HELP ME!!! IT IS VERY, VERY IMPORTANT.
Well, neither usrp-users nor discuss-gnuradio are support lists
for MATLAB.
You haven't mentioned which daughter-card you are using in the
N200, which would certainly help to fill in information about
what *might* be going on.
Does your receiver setup use AGC? Do you know what its set-points
are?
If you simply look at the spectrum on the RX end as you vary gain
on the TX end, do you see a change? At the higher end,
SNR may not change very much, depending on how it is being
measured, etc.
--
*Thanks and Regards**
*
*Arhum Ahmad*
Ph.D. Scholar, Electrical Engineering Department, IIT Ropar
+91- <tel:+91-7015802356>7974897279 | arhum.19eez0...@iitrpr.ac.in
<mailto:2016eez0...@iitrpr.ac.in>
Lab No. 323, Communication Research Lab, J.C.Bose Building
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