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

[Cinaed Simson]

On 1/22/19 1:54 PM, Luis Felipe Albarracin Sanchez wrote:
> Hello Cinaed, Discussion List,
> 
> Once again thank you for the response,
> 
> Please believe me that i have gone through tutorials, and i have
> understood that in the python Top block i could enable/disable blocks, i
> also went through this specific one for modulations:
> 
> https://wiki.gnuradio.org/index.php/Guided_Tutorial_PSK_Demodulation
> 
> An you are totally correct regarding how to modulate properly, 
> nevertheless what i am trying to do is that while the flowgraph is
> running, to switch the modulation (even if is not totally tuned) and
> that i can see that modulation in the QT  GUI.
> 
> That´s why, if you take a look at my flowgraph you see how I create a QT
> Chooser so I can select the modulation.
> 
> My main problem is that i can not get it to work, it does not switch to
> other modulation when I switch in the QT Gui while I run the flowgraph.>
> I would appreciate any ideas regarding this, and also i f you (Cianed)
> could describe me a little more how a Hierarchical Block could help me
> in this.

For hierarchical Block - see the tutorials and Google.

I use QT for passing variables and parameters - but I mainly use the
command line. So I can't help you with QT.

See if you can actually calculate BER for a single psk - say BPSK -
configure by a Constellation Object.

If that works, then add another Constellation Object - say for QPSK -
configured - only for QPSK - so now you have 2 Constellation Objects in
the flowgraph.

Now run them in parallel using BER Curve.

-- Cinaed



> 
> Once again thank you all.
> 
> Kind regards.
> 
> On Tue, Jan 22, 2019 at 3:51 PM Cinaed Simson <address@hidden
> <mailto:address@hidden>> wrote:
> 
>     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>
>     > <mailto: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"
> 
> 
> 
> -- 
> 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"