Re: [Discuss-gnuradio] BER Example - With QT Gui Chooser for Different Modulations Issue

[Luis Felipe Albarracin Sanchez]

Hello Cinaed,

Thank you for the quick response,

I look at your flowgraph, and i appreciate al the corrections you told me.

I must just say that i was guiding myself through the examples that are under the folder digital when you install GNU Radio.

I took your model, and did some changes to mine (attached my new file) but i still can´t get in the QT GUI to switch between different modulations, if i start with 8-QAM  it does not switch to QPSK when i choose QPSK in the  QT Chooser, i would appreciate if you can give me any ideas regarding this.

Kind regards.

On Tue, Jan 22, 2019 at 1:00 AM Cinaed Simson <address@hidden> wrote:

On 1/21/19 3:47 PM, Luis Felipe Albarracin Sanchez wrote:
> Hello all,
>
> I am exploring  the BER measurements in GNU Radio for different
> modulations (I know Error Rate is deprecated) but i tried the example
> under the digital folder for BER measurement and I understood all the
> flowgraph.
>
> After this i wanted to change the modulation in the QT GUI so i added a
> QT Gui Chooser as seen in the flowgraph below:
>
> Captura de pantalla de 2019-01-21 18-37-34.png
>
>
> Attached is the flowgraph for reference.
>
> When i add this i expected that the Constellation would change
> accordingly, but it does not  when i choose a different constellation
> with the chooser, for instance if the default value in the chooser is
> QPSK it shows at the beginning:
>
> Captura de pantalla de 2019-01-21 18-44-25.png
>
> But  If i switch in the same running time to 8-PSKn it shows:

Everything - I mean everything - was configured with 8PSK constellation
data- and incorrectly - even the random number generator!

I'm surprise you could see anything!

Enclosed is the proper way to create a QPSK constellation.

Work through the tutorials at

  https://wiki.gnuradio.org/index.php/Tutorials


-- Cinaed


>
> Captura de pantalla de 2019-01-21 18-44-44.png
>
>
> Which is not an 8-PSK modulation scheme.
>
> I would appreciate some help,. regarding what i am doing wrong  for
> choosing a Modulation through the QT GUI.
>
> Thanks in advance.
>
> Kind Regards.
>
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--

Eng. Luis Felipe Albarracin

Msc. Telematics / MBA
PMP
CCNA/CCDA/CCNP/CCDP/CCIP
ITIL v3 Foundation
"Die Grenzen meiner Sprache bedeuten die Grenzen meiner Welt"

my-ber_simulation_LFA.grc
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