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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> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
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<?grc format='1' created='3.7.13'?>
<flow_graph>
<timestamp>Sat Jul 12 13:50:53 2014</timestamp>
<block>
<key>options</key>
<param>
<key>author</key>
<value>Example</value>
</param>
<param>
<key>window_size</key>
<value>1280, 1024</value>
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<param>
<key>category</key>
<value>Custom</value>
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<key>comment</key>
<value></value>
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<param>
<key>description</key>
<value>Adjust the noise and constellation... see what happens!</value>
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<value>{python} -u {filename}</value>
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<key>title</key>
<value>BER Simulation</value>
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<value>(0,0)</value>
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<block>
<key>variable_qtgui_range</key>
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<value>EbN0</value>
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<value>Eb / N0 (dB)</value>
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<key>start</key>
<value>-10</value>
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<key>step</key>
<value>1</value>
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<key>stop</key>
<value>200</value>
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<key>rangeType</key>
<value>float</value>
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<key>widget</key>
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<block>
<key>variable_qtgui_chooser</key>
<param>
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<value>BPSK</value>
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<key>label1</key>
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<key>label2</key>
<value>8PSK</value>
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<key>label3</key>
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<value>3</value>
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<value>4</value>
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<param>
<key>options</key>
<value>[0, 1, 2]</value>
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<param>
<key>orient</key>
<value>Qt.QVBoxLayout</value>
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<param>
<key>type</key>
<value>int</value>
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<key>widget</key>
<value>combo_box</value>
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<block>
<key>variable</key>
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<key>comment</key>
<value></value>
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<key>_coordinate</key>
<value>(116, 310)</value>
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<key>_rotation</key>
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<key>id</key>
<value>const</value>
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<param>
<key>value</key>
<value>(digital.constellation_bpsk(), digital.constellation_qpsk(), digital.constellation_8psk())</value>
</param>
</block>
<block>
<key>variable_constellation</key>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>const_points</key>
<value>digital.psk_4()[0]</value>
</param>
<param>
<key>type</key>
<value>calcdist</value>
</param>
<param>
<key>dims</key>
<value>digital.qpsk_constellation().dimensionality()</value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
</param>
<param>
<key>_coordinate</key>
<value>(328, 8)</value>
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<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>qpsk</value>
</param>
<param>
<key>rot_sym</key>
<value>digital.qpsk_constellation().rotational_symmetry()</value>
</param>
<param>
<key>soft_dec_lut</key>
<value>'auto'</value>
</param>
<param>
<key>precision</key>
<value>8</value>
</param>
<param>
<key>sym_map</key>
<value>digital.psk_4()[1]</value>
</param>
</block>
<block>
<key>variable</key>
<param>
<key>comment</key>
<value></value>
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<key>_enabled</key>
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<key>_coordinate</key>
<value>(736, 36)</value>
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<key>_rotation</key>
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<param>
<key>id</key>
<value>rcc_nfilts</value>
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<param>
<key>value</key>
<value>32</value>
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<block>
<key>variable</key>
<param>
<key>comment</key>
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<key>_enabled</key>
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<key>_rotation</key>
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<key>id</key>
<value>rcc_roll_off</value>
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<key>value</key>
<value>.350</value>
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<block>
<key>variable</key>
<param>
<key>comment</key>
<value></value>
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<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(576, 36)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>rrc_taps</value>
</param>
<param>
<key>value</key>
<value>firdes.root_raised_cosine(rcc_nfilts, rcc_nfilts, 1.0/float(sps), rcc_roll_off, 11*sps*rcc_nfilts)</value>
</param>
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<key>comment</key>
<value></value>
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<key>_enabled</key>
<value>True</value>
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<key>_coordinate</key>
<value>(16, 308)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>samp_rate</value>
</param>
<param>
<key>value</key>
<value>100e3</value>
</param>
</block>
<block>
<key>variable</key>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
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<param>
<key>_coordinate</key>
<value>(920, 36)</value>
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<param>
<key>_rotation</key>
<value>0</value>
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<param>
<key>id</key>
<value>sps</value>
</param>
<param>
<key>value</key>
<value>4</value>
</param>
</block>
<block>
<key>variable_qtgui_label</key>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>value</key>
<value>{0: 'BPSK', 1: 'QPSK', 2: '8-PSK'}[const_type] + " - Change const_type for different constellation types!"</value>
</param>
<param>
<key>_enabled</key>
<value>0</value>
</param>
<param>
<key>formatter</key>
<value>None</value>
</param>
<param>
<key>_coordinate</key>
<value>(294, 413)</value>
</param>
<param>
<key>gui_hint</key>
<value></value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>variable_qtgui_label_0</value>
</param>
<param>
<key>label</key>
<value>Constellation Type</value>
</param>
<param>
<key>type</key>
<value>string</value>
</param>
</block>
<block>
<key>analog_noise_source_x</key>
<param>
<key>amp</key>
<value>1.0 </value>
</param>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
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<key>affinity</key>
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<value>0</value>
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<value>(632, 300)</value>
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<value>0</value>
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<key>id</key>
<value>analog_noise_source_x</value>
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<key>maxoutbuf</key>
<value>0</value>
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<key>minoutbuf</key>
<value>0</value>
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<param>
<key>noise_type</key>
<value>analog.GR_GAUSSIAN</value>
</param>
<param>
<key>type</key>
<value>complex</value>
</param>
<param>
<key>seed</key>
<value>42</value>
</param>
</block>
<block>
<key>analog_random_source_x</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
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<param>
<key>_coordinate</key>
<value>(24, 160)</value>
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<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>analog_random_source_x</value>
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<key>maxoutbuf</key>
<value>0</value>
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<key>max</key>
<value>256</value>
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<key>minoutbuf</key>
<value>0</value>
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<param>
<key>min</key>
<value>0</value>
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<key>num_samps</key>
<value>256</value>
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<key>type</key>
<value>byte</value>
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<key>repeat</key>
<value>True</value>
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<block>
<key>blks2_error_rate</key>
<param>
<key>bits_per_symbol</key>
<value>2</value>
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<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>0</value>
</param>
<param>
<key>_coordinate</key>
<value>(472, 300)</value>
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<param>
<key>_rotation</key>
<value>0</value>
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<param>
<key>id</key>
<value>blks2_error_rate</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</value>
</param>
<param>
<key>type</key>
<value>'BER'</value>
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<param>
<key>win_size</key>
<value>int(1e7)</value>
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<key>alias</key>
<value></value>
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<value>[[0,],]</value>
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<key>comment</key>
<value></value>
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<key>affinity</key>
<value></value>
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<value>True</value>
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<value>(1072, 136)</value>
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<key>_rotation</key>
<value>0</value>
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<key>id</key>
<value>blocks_null_sink_0</value>
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<param>
<key>type</key>
<value>byte</value>
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<value>1</value>
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<value>1</value>
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<block>
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<key>affinity</key>
<value></value>
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<param>
<key>_enabled</key>
<value>True</value>
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<param>
<key>_coordinate</key>
<value>(192, 180)</value>
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<param>
<key>_rotation</key>
<value>0</value>
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<value>blocks_throttle</value>
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<value>True</value>
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<value>0</value>
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<value>0</value>
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<value>samp_rate</value>
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<value>byte</value>
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<value>1</value>
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<block>
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<key>comment</key>
<value></value>
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<value>qpsk</value>
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<value></value>
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<value>True</value>
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<value>(840, 132)</value>
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<value>0</value>
</param>
<param>
<key>id</key>
<value>digital_constellation_decoder_cb_0</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</value>
</param>
</block>
<block>
<key>digital_constellation_modulator</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>constellation</key>
<value>qpsk</value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>differential</key>
<value>False</value>
</param>
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<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>excess_bw</key>
<value>0.35</value>
</param>
<param>
<key>_coordinate</key>
<value>(360, 160)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>digital_constellation_modulator_0</value>
</param>
<param>
<key>log</key>
<value>False</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</value>
</param>
<param>
<key>samples_per_symbol</key>
<value>sps</value>
</param>
<param>
<key>verbose</key>
<value>False</value>
</param>
</block>
<block>
<key>digital_pfb_clock_sync_xxx</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>filter_size</key>
<value>32</value>
</param>
<param>
<key>_coordinate</key>
<value>(592, 136)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>digital_pfb_clock_sync_xxx_0</value>
</param>
<param>
<key>init_phase</key>
<value>16</value>
</param>
<param>
<key>loop_bw</key>
<value>.350</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>max_dev</key>
<value>1.5</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</value>
</param>
<param>
<key>osps</key>
<value>1</value>
</param>
<param>
<key>sps</key>
<value>sps</value>
</param>
<param>
<key>taps</key>
<value>rrc_taps</value>
</param>
<param>
<key>type</key>
<value>ccf</value>
</param>
</block>
<block>
<key>import</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(18, 373)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>import</value>
</param>
<param>
<key>import</key>
<value>import math</value>
</param>
</block>
<block>
<key>qtgui_const_sink_x</key>
<param>
<key>autoscale</key>
<value>False</value>
</param>
<param>
<key>axislabels</key>
<value>True</value>
</param>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(840, 196)</value>
</param>
<param>
<key>gui_hint</key>
<value></value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>grid</key>
<value>False</value>
</param>
<param>
<key>id</key>
<value>qtgui_const_sink_x_0</value>
</param>
<param>
<key>legend</key>
<value>True</value>
</param>
<param>
<key>alpha1</key>
<value>0.6</value>
</param>
<param>
<key>color1</key>
<value>"blue"</value>
</param>
<param>
<key>label1</key>
<value>"Constellation: "+str(const[const_type].arity()) + "-PSK"</value>
</param>
<param>
<key>marker1</key>
<value>0</value>
</param>
<param>
<key>style1</key>
<value>0</value>
</param>
<param>
<key>width1</key>
<value>1</value>
</param>
<param>
<key>alpha10</key>
<value>1.0</value>
</param>
<param>
<key>color10</key>
<value>"red"</value>
</param>
<param>
<key>label10</key>
<value></value>
</param>
<param>
<key>marker10</key>
<value>0</value>
</param>
<param>
<key>style10</key>
<value>0</value>
</param>
<param>
<key>width10</key>
<value>1</value>
</param>
<param>
<key>alpha2</key>
<value>1.0</value>
</param>
<param>
<key>color2</key>
<value>"red"</value>
</param>
<param>
<key>label2</key>
<value></value>
</param>
<param>
<key>marker2</key>
<value>0</value>
</param>
<param>
<key>style2</key>
<value>0</value>
</param>
<param>
<key>width2</key>
<value>1</value>
</param>
<param>
<key>alpha3</key>
<value>1.0</value>
</param>
<param>
<key>color3</key>
<value>"red"</value>
</param>
<param>
<key>label3</key>
<value></value>
</param>
<param>
<key>marker3</key>
<value>0</value>
</param>
<param>
<key>style3</key>
<value>0</value>
</param>
<param>
<key>width3</key>
<value>1</value>
</param>
<param>
<key>alpha4</key>
<value>1.0</value>
</param>
<param>
<key>color4</key>
<value>"red"</value>
</param>
<param>
<key>label4</key>
<value></value>
</param>
<param>
<key>marker4</key>
<value>0</value>
</param>
<param>
<key>style4</key>
<value>0</value>
</param>
<param>
<key>width4</key>
<value>1</value>
</param>
<param>
<key>alpha5</key>
<value>1.0</value>
</param>
<param>
<key>color5</key>
<value>"red"</value>
</param>
<param>
<key>label5</key>
<value></value>
</param>
<param>
<key>marker5</key>
<value>0</value>
</param>
<param>
<key>style5</key>
<value>0</value>
</param>
<param>
<key>width5</key>
<value>1</value>
</param>
<param>
<key>alpha6</key>
<value>1.0</value>
</param>
<param>
<key>color6</key>
<value>"red"</value>
</param>
<param>
<key>label6</key>
<value></value>
</param>
<param>
<key>marker6</key>
<value>0</value>
</param>
<param>
<key>style6</key>
<value>0</value>
</param>
<param>
<key>width6</key>
<value>1</value>
</param>
<param>
<key>alpha7</key>
<value>1.0</value>
</param>
<param>
<key>color7</key>
<value>"red"</value>
</param>
<param>
<key>label7</key>
<value></value>
</param>
<param>
<key>marker7</key>
<value>0</value>
</param>
<param>
<key>style7</key>
<value>0</value>
</param>
<param>
<key>width7</key>
<value>1</value>
</param>
<param>
<key>alpha8</key>
<value>1.0</value>
</param>
<param>
<key>color8</key>
<value>"red"</value>
</param>
<param>
<key>label8</key>
<value></value>
</param>
<param>
<key>marker8</key>
<value>0</value>
</param>
<param>
<key>style8</key>
<value>0</value>
</param>
<param>
<key>width8</key>
<value>1</value>
</param>
<param>
<key>alpha9</key>
<value>1.0</value>
</param>
<param>
<key>color9</key>
<value>"red"</value>
</param>
<param>
<key>label9</key>
<value></value>
</param>
<param>
<key>marker9</key>
<value>0</value>
</param>
<param>
<key>style9</key>
<value>0</value>
</param>
<param>
<key>width9</key>
<value>1</value>
</param>
<param>
<key>name</key>
<value>"foo"</value>
</param>
<param>
<key>nconnections</key>
<value>1</value>
</param>
<param>
<key>size</key>
<value>1024</value>
</param>
<param>
<key>tr_chan</key>
<value>0</value>
</param>
<param>
<key>tr_level</key>
<value>0.0</value>
</param>
<param>
<key>tr_mode</key>
<value>qtgui.TRIG_MODE_FREE</value>
</param>
<param>
<key>tr_slope</key>
<value>qtgui.TRIG_SLOPE_POS</value>
</param>
<param>
<key>tr_tag</key>
<value>""</value>
</param>
<param>
<key>type</key>
<value>complex</value>
</param>
<param>
<key>update_time</key>
<value>0.10</value>
</param>
<param>
<key>xmax</key>
<value>2</value>
</param>
<param>
<key>xmin</key>
<value>-2</value>
</param>
<param>
<key>ymax</key>
<value>2</value>
</param>
<param>
<key>ymin</key>
<value>-2</value>
</param>
</block>
<block>
<key>qtgui_number_sink</key>
<param>
<key>autoscale</key>
<value>True</value>
</param>
<param>
<key>avg</key>
<value>0</value>
</param>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>0</value>
</param>
<param>
<key>_coordinate</key>
<value>(480, 388)</value>
</param>
<param>
<key>gui_hint</key>
<value>1,0,1,1</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>graph_type</key>
<value>qtgui.NUM_GRAPH_NONE</value>
</param>
<param>
<key>id</key>
<value>qtgui_number_sink_0</value>
</param>
<param>
<key>type</key>
<value>float</value>
</param>
<param>
<key>color1</key>
<value>("black", "black")</value>
</param>
<param>
<key>factor1</key>
<value>1e6</value>
</param>
<param>
<key>label1</key>
<value>BER</value>
</param>
<param>
<key>unit1</key>
<value>x10^-6</value>
</param>
<param>
<key>color10</key>
<value>("black", "black")</value>
</param>
<param>
<key>factor10</key>
<value>1</value>
</param>
<param>
<key>label10</key>
<value></value>
</param>
<param>
<key>unit10</key>
<value></value>
</param>
<param>
<key>color2</key>
<value>("black", "black")</value>
</param>
<param>
<key>factor2</key>
<value>1</value>
</param>
<param>
<key>label2</key>
<value></value>
</param>
<param>
<key>unit2</key>
<value></value>
</param>
<param>
<key>color3</key>
<value>("black", "black")</value>
</param>
<param>
<key>factor3</key>
<value>1</value>
</param>
<param>
<key>label3</key>
<value></value>
</param>
<param>
<key>unit3</key>
<value></value>
</param>
<param>
<key>color4</key>
<value>("black", "black")</value>
</param>
<param>
<key>factor4</key>
<value>1</value>
</param>
<param>
<key>label4</key>
<value></value>
</param>
<param>
<key>unit4</key>
<value></value>
</param>
<param>
<key>color5</key>
<value>("black", "black")</value>
</param>
<param>
<key>factor5</key>
<value>1</value>
</param>
<param>
<key>label5</key>
<value></value>
</param>
<param>
<key>unit5</key>
<value></value>
</param>
<param>
<key>color6</key>
<value>("black", "black")</value>
</param>
<param>
<key>factor6</key>
<value>1</value>
</param>
<param>
<key>label6</key>
<value></value>
</param>
<param>
<key>unit6</key>
<value></value>
</param>
<param>
<key>color7</key>
<value>("black", "black")</value>
</param>
<param>
<key>factor7</key>
<value>1</value>
</param>
<param>
<key>label7</key>
<value></value>
</param>
<param>
<key>unit7</key>
<value></value>
</param>
<param>
<key>color8</key>
<value>("black", "black")</value>
</param>
<param>
<key>factor8</key>
<value>1</value>
</param>
<param>
<key>label8</key>
<value></value>
</param>
<param>
<key>unit8</key>
<value></value>
</param>
<param>
<key>color9</key>
<value>("black", "black")</value>
</param>
<param>
<key>factor9</key>
<value>1</value>
</param>
<param>
<key>label9</key>
<value></value>
</param>
<param>
<key>unit9</key>
<value></value>
</param>
<param>
<key>max</key>
<value>1</value>
</param>
<param>
<key>min</key>
<value>0</value>
</param>
<param>
<key>name</key>
<value>""</value>
</param>
<param>
<key>nconnections</key>
<value>1</value>
</param>
<param>
<key>update_time</key>
<value>0.10</value>
</param>
</block>
<connection>
<source_block_id>analog_random_source_x</source_block_id>
<sink_block_id>blocks_throttle</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_throttle</source_block_id>
<sink_block_id>digital_constellation_modulator_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_constellation_decoder_cb_0</source_block_id>
<sink_block_id>blocks_null_sink_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_constellation_modulator_0</source_block_id>
<sink_block_id>digital_pfb_clock_sync_xxx_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
<sink_block_id>digital_constellation_decoder_cb_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
<sink_block_id>qtgui_const_sink_x_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
</flow_graph>
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