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

[Cinaed Simson]

On 1/22/19 8:51 AM, Luis Felipe Albarracin Sanchez wrote:
> 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.

Those examples presume you have already gone through the tutorials.

> 
> 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.

Right click on the Constellation Object, and there's a pull down menu
under Constellation Type  - select the one you want.

If that's not what you're looking for then you have to figure out how to
do whatever it is you want to do. And it may require creating a
hierarchical block.

My advice is to work through the tutorials.

-- Cinaed


> 
> Kind regards.
> 
> 
> 
> On Tue, Jan 22, 2019 at 1:00 AM Cinaed Simson <address@hidden
> <mailto: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"