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

From: Cinaed Simson
Subject: Re: [Discuss-gnuradio] BER Example - With QT Gui Chooser for Different Modulations Issue
Date: Mon, 21 Jan 2019 21:41:46 -0800
User-agent: Mozilla/5.0 (X11; Linux i686; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

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


-- 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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> Discuss-gnuradio mailing list
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> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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