0
$\begingroup$

I am trying to create a random signal in GNU Radio (using DVB-S2 specs for the physical layer) and transmit this signal using a USRP X310. This is shown below:

enter image description here

Problem: I would like to be able to control the Es/No of this signal, as well as the symbol rate, but I don't know how. I'm brand new to DSP, so any help is appreciated!

Edit (2/9/2022): Removed throttle block, since it is unnecessary. To clarify, I would like to run GNU Radio on a USRP, then pipe the signal directly into another USRP to receive the signal. I would like to be able to control the Es/No in GNU Radio on the transmitter side, to test the capabilities of the receiver.

Improve this question
$\endgroup$
4
  • $\begingroup$ $E_s/N_0$ happens at the receiver, not the transmitter (the transmitter can relatively safely be assumed to be noise-free). The symbol rate is fixed (or, to be chosen from a fixed list) by the standard, so you can't vary that, either, if you're using DVB-S2 specs. $\endgroup$
    – Marcus Müller
    Feb 9, 2022 at 10:23
  • $\begingroup$ by the way, the sample rates are all wrong, and you must not use a throttle in the same graph as a USRP – the GRC log window will alert you to both! $\endgroup$
    – Marcus Müller
    Feb 9, 2022 at 10:34
  • $\begingroup$ @MarcusMüller, thanks for the response! In this setup (Data -> GNU Radio -> USRP), where is the symbol rate being set? It seems to me like the sample rate is set by the USRP, so then if I know the samples per symbol (2 for QPSK for example), will I know the symbol rate? Thanks! $\endgroup$
    – Matthew Hilts
    Feb 9, 2022 at 15:45
  • $\begingroup$ that sounds about right; note that the throttle really does nothing to the digital signal, just artificially slows down computations, and you can't have that here, it competes with the USRP. $\endgroup$
    – Marcus Müller
    Feb 9, 2022 at 15:50

0

Reset to default

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Browse other questions tagged or ask your own question.