Actually, PSK MOD has been depreciated.
Instead, you should probable use the Constellation Modulator and
Constellation Object.
Note, you did reproduced the constellation in the tutorial - but its
emphasis is on the hardware.
See the following tutorial instead
https://wiki.gnuradio.org/index.php/Guided_Tutorial_PSK_Demodulation#Objectives
In any case, in the enclosed example, I replaced the PSK MOD with the
Constellation Modulator/Constellation Object for qpsk - and I inserted a
Rational Resampler in front of the USRP sink.
-- Cinaed
On 11/01/2018 07:26 AM, Mercado, Alejandra wrote:
> Dear GnuRadio folks,
>
> I have a questions about the "PSK Mod" block of GnuRadio. I am following
> the tutorial found
> here:
> https://wiki.gnuradio.org/index.php/Guided_Tutorial_Hardware_Considerations
> (the grc is attached)
>
> I followed the instructions to see the output of PSK Mod for 4
> constellation points. To my surprise, the constellation graph shows
> points that are ambiguously between quadrants (see the screenshot).
>
> What causes this? Is it the PSK Mod block that creates output points
> that do not correspond to one of the four points? Or is it the QT GUI
> that is not displaying the output correctly? Or both?
>
> Thanks and regards
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
<?xml version='1.0' encoding='utf-8'?>
<?grc format='1' created='3.7.13'?>
<flow_graph>
<timestamp>Wed Oct 31 10:10:40 2018</timestamp>
<block>
<key>options</key>
<param>
<key>author</key>
<value></value>
</param>
<param>
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<value></value>
</param>
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</param>
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<param>
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<value></value>
</param>
<param>
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<value>{python} -u {filename}</value>
</param>
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<value>prompt</value>
</param>
<param>
<key>run</key>
<value>True</value>
</param>
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<value>fixed</value>
</param>
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<value></value>
</param>
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<key>title</key>
<value></value>
</param>
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<value>(0,0)</value>
</param>
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<block>
<key>variable_qtgui_range</key>
<param>
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<value></value>
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<key>value</key>
<value>0.5</value>
</param>
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</param>
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<key>_coordinate</key>
<value>(184, 16)</value>
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<value></value>
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<value>200</value>
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<value>Qt.Horizontal</value>
</param>
<param>
<key>start</key>
<value>0.1</value>
</param>
<param>
<key>step</key>
<value>0.01</value>
</param>
<param>
<key>stop</key>
<value>0.5</value>
</param>
<param>
<key>rangeType</key>
<value>float</value>
</param>
<param>
<key>widget</key>
<value>counter_slider</value>
</param>
</block>
<block>
<key>variable_constellation</key>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>const_points</key>
<value>[-1-1j, -1+1j, 1+1j, 1-1j]</value>
</param>
<param>
<key>type</key>
<value>calcdist</value>
</param>
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</param>
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</param>
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<value>[0, 1, 3, 2]</value>
</param>
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<key>variable</key>
<param>
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<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
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<value>2**15</value>
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<block>
<key>variable</key>
<param>
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<value></value>
</param>
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<key>_enabled</key>
<value>True</value>
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<value>(320, 20)</value>
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<value>0</value>
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<key>id</key>
<value>sps</value>
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<param>
<key>value</key>
<value>2</value>
</param>
</block>
<block>
<key>analog_random_source_x</key>
<param>
<key>alias</key>
<value></value>
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<key>comment</key>
<value></value>
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<value>True</value>
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<value>(56, 183)</value>
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<key>id</key>
<value>analog_random_source_x_0</value>
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<key>max</key>
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<value>True</value>
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<block>
<key>blocks_multiply_const_vxx</key>
<param>
<key>alias</key>
<value></value>
</param>
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<value></value>
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<value>1</value>
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<value>1</value>
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<block>
<key>digital_constellation_modulator</key>
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<block>
<key>qtgui_sink_x</key>
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<key>bw</key>
<value>samp_rate</value>
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</param>
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</param>
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<value>True</value>
</param>
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</param>
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<value>firdes.WIN_BLACKMAN_hARRIS</value>
</param>
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<key>rational_resampler_xxx</key>
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<value></value>
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<value>TX/RX</value>
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<value>samp_rate</value>
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<value>918.25e6</value>
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<value>0</value>
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<value>False</value>
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<value></value>
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<value>0</value>
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<key>center_freq16</key>
<value>0</value>
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<key>norm_gain16</key>
<value>False</value>
</param>
<param>
<key>gain16</key>
<value>0</value>
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<key>ant17</key>
<value></value>
</param>
<param>
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<key>norm_gain17</key>
<value>False</value>
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<key>gain17</key>
<value>0</value>
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<key>ant18</key>
<value></value>
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<value>0</value>
</param>
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<key>center_freq18</key>
<value>0</value>
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<key>norm_gain18</key>
<value>False</value>
</param>
<param>
<key>gain18</key>
<value>0</value>
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<param>
<key>ant19</key>
<value></value>
</param>
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<key>bw19</key>
<value>0</value>
</param>
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<key>center_freq19</key>
<value>0</value>
</param>
<param>
<key>norm_gain19</key>
<value>False</value>
</param>
<param>
<key>gain19</key>
<value>0</value>
</param>
<param>
<key>ant1</key>
<value></value>
</param>
<param>
<key>bw1</key>
<value>0</value>
</param>
<param>
<key>center_freq1</key>
<value>0</value>
</param>
<param>
<key>norm_gain1</key>
<value>False</value>
</param>
<param>
<key>gain1</key>
<value>0</value>
</param>
<param>
<key>ant20</key>
<value></value>
</param>
<param>
<key>bw20</key>
<value>0</value>
</param>
<param>
<key>center_freq20</key>
<value>0</value>
</param>
<param>
<key>norm_gain20</key>
<value>False</value>
</param>
<param>
<key>gain20</key>
<value>0</value>
</param>
<param>
<key>ant21</key>
<value></value>
</param>
<param>
<key>bw21</key>
<value>0</value>
</param>
<param>
<key>center_freq21</key>
<value>0</value>
</param>
<param>
<key>norm_gain21</key>
<value>False</value>
</param>
<param>
<key>gain21</key>
<value>0</value>
</param>
<param>
<key>ant22</key>
<value></value>
</param>
<param>
<key>bw22</key>
<value>0</value>
</param>
<param>
<key>center_freq22</key>
<value>0</value>
</param>
<param>
<key>norm_gain22</key>
<value>False</value>
</param>
<param>
<key>gain22</key>
<value>0</value>
</param>
<param>
<key>ant23</key>
<value></value>
</param>
<param>
<key>bw23</key>
<value>0</value>
</param>
<param>
<key>center_freq23</key>
<value>0</value>
</param>
<param>
<key>norm_gain23</key>
<value>False</value>
</param>
<param>
<key>gain23</key>
<value>0</value>
</param>
<param>
<key>ant24</key>
<value></value>
</param>
<param>
<key>bw24</key>
<value>0</value>
</param>
<param>
<key>center_freq24</key>
<value>0</value>
</param>
<param>
<key>norm_gain24</key>
<value>False</value>
</param>
<param>
<key>gain24</key>
<value>0</value>
</param>
<param>
<key>ant25</key>
<value></value>
</param>
<param>
<key>bw25</key>
<value>0</value>
</param>
<param>
<key>center_freq25</key>
<value>0</value>
</param>
<param>
<key>norm_gain25</key>
<value>False</value>
</param>
<param>
<key>gain25</key>
<value>0</value>
</param>
<param>
<key>ant26</key>
<value></value>
</param>
<param>
<key>bw26</key>
<value>0</value>
</param>
<param>
<key>center_freq26</key>
<value>0</value>
</param>
<param>
<key>norm_gain26</key>
<value>False</value>
</param>
<param>
<key>gain26</key>
<value>0</value>
</param>
<param>
<key>ant27</key>
<value></value>
</param>
<param>
<key>bw27</key>
<value>0</value>
</param>
<param>
<key>center_freq27</key>
<value>0</value>
</param>
<param>
<key>norm_gain27</key>
<value>False</value>
</param>
<param>
<key>gain27</key>
<value>0</value>
</param>
<param>
<key>ant28</key>
<value></value>
</param>
<param>
<key>bw28</key>
<value>0</value>
</param>
<param>
<key>center_freq28</key>
<value>0</value>
</param>
<param>
<key>norm_gain28</key>
<value>False</value>
</param>
<param>
<key>gain28</key>
<value>0</value>
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<param>
<key>ant29</key>
<value></value>
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<value>0</value>
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<param>
<key>center_freq29</key>
<value>0</value>
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<param>
<key>norm_gain29</key>
<value>False</value>
</param>
<param>
<key>gain29</key>
<value>0</value>
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<param>
<key>ant2</key>
<value></value>
</param>
<param>
<key>bw2</key>
<value>0</value>
</param>
<param>
<key>center_freq2</key>
<value>0</value>
</param>
<param>
<key>norm_gain2</key>
<value>False</value>
</param>
<param>
<key>gain2</key>
<value>0</value>
</param>
<param>
<key>ant30</key>
<value></value>
</param>
<param>
<key>bw30</key>
<value>0</value>
</param>
<param>
<key>center_freq30</key>
<value>0</value>
</param>
<param>
<key>norm_gain30</key>
<value>False</value>
</param>
<param>
<key>gain30</key>
<value>0</value>
</param>
<param>
<key>ant31</key>
<value></value>
</param>
<param>
<key>bw31</key>
<value>0</value>
</param>
<param>
<key>center_freq31</key>
<value>0</value>
</param>
<param>
<key>norm_gain31</key>
<value>False</value>
</param>
<param>
<key>gain31</key>
<value>0</value>
</param>
<param>
<key>ant3</key>
<value></value>
</param>
<param>
<key>bw3</key>
<value>0</value>
</param>
<param>
<key>center_freq3</key>
<value>0</value>
</param>
<param>
<key>norm_gain3</key>
<value>False</value>
</param>
<param>
<key>gain3</key>
<value>0</value>
</param>
<param>
<key>ant4</key>
<value></value>
</param>
<param>
<key>bw4</key>
<value>0</value>
</param>
<param>
<key>center_freq4</key>
<value>0</value>
</param>
<param>
<key>norm_gain4</key>
<value>False</value>
</param>
<param>
<key>gain4</key>
<value>0</value>
</param>
<param>
<key>ant5</key>
<value></value>
</param>
<param>
<key>bw5</key>
<value>0</value>
</param>
<param>
<key>center_freq5</key>
<value>0</value>
</param>
<param>
<key>norm_gain5</key>
<value>False</value>
</param>
<param>
<key>gain5</key>
<value>0</value>
</param>
<param>
<key>ant6</key>
<value></value>
</param>
<param>
<key>bw6</key>
<value>0</value>
</param>
<param>
<key>center_freq6</key>
<value>0</value>
</param>
<param>
<key>norm_gain6</key>
<value>False</value>
</param>
<param>
<key>gain6</key>
<value>0</value>
</param>
<param>
<key>ant7</key>
<value></value>
</param>
<param>
<key>bw7</key>
<value>0</value>
</param>
<param>
<key>center_freq7</key>
<value>0</value>
</param>
<param>
<key>norm_gain7</key>
<value>False</value>
</param>
<param>
<key>gain7</key>
<value>0</value>
</param>
<param>
<key>ant8</key>
<value></value>
</param>
<param>
<key>bw8</key>
<value>0</value>
</param>
<param>
<key>center_freq8</key>
<value>0</value>
</param>
<param>
<key>norm_gain8</key>
<value>False</value>
</param>
<param>
<key>gain8</key>
<value>0</value>
</param>
<param>
<key>ant9</key>
<value></value>
</param>
<param>
<key>bw9</key>
<value>0</value>
</param>
<param>
<key>center_freq9</key>
<value>0</value>
</param>
<param>
<key>norm_gain9</key>
<value>False</value>
</param>
<param>
<key>gain9</key>
<value>0</value>
</param>
<param>
<key>clock_rate</key>
<value>0.0</value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>dev_addr</key>
<value>""</value>
</param>
<param>
<key>dev_args</key>
<value>""</value>
</param>
<param>
<key>_enabled</key>
<value>0</value>
</param>
<param>
<key>_coordinate</key>
<value>(1040, 256)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>uhd_usrp_sink_0</value>
</param>
<param>
<key>type</key>
<value>fc32</value>
</param>
<param>
<key>clock_source0</key>
<value></value>
</param>
<param>
<key>sd_spec0</key>
<value></value>
</param>
<param>
<key>time_source0</key>
<value></value>
</param>
<param>
<key>clock_source1</key>
<value></value>
</param>
<param>
<key>sd_spec1</key>
<value></value>
</param>
<param>
<key>time_source1</key>
<value></value>
</param>
<param>
<key>clock_source2</key>
<value></value>
</param>
<param>
<key>sd_spec2</key>
<value></value>
</param>
<param>
<key>time_source2</key>
<value></value>
</param>
<param>
<key>clock_source3</key>
<value></value>
</param>
<param>
<key>sd_spec3</key>
<value></value>
</param>
<param>
<key>time_source3</key>
<value></value>
</param>
<param>
<key>clock_source4</key>
<value></value>
</param>
<param>
<key>sd_spec4</key>
<value></value>
</param>
<param>
<key>time_source4</key>
<value></value>
</param>
<param>
<key>clock_source5</key>
<value></value>
</param>
<param>
<key>sd_spec5</key>
<value></value>
</param>
<param>
<key>time_source5</key>
<value></value>
</param>
<param>
<key>clock_source6</key>
<value></value>
</param>
<param>
<key>sd_spec6</key>
<value></value>
</param>
<param>
<key>time_source6</key>
<value></value>
</param>
<param>
<key>clock_source7</key>
<value></value>
</param>
<param>
<key>sd_spec7</key>
<value></value>
</param>
<param>
<key>time_source7</key>
<value></value>
</param>
<param>
<key>nchan</key>
<value>1</value>
</param>
<param>
<key>num_mboards</key>
<value>1</value>
</param>
<param>
<key>samp_rate</key>
<value>samp_rate</value>
</param>
<param>
<key>hide_cmd_port</key>
<value>False</value>
</param>
<param>
<key>hide_lo_controls</key>
<value>True</value>
</param>
<param>
<key>stream_args</key>
<value></value>
</param>
<param>
<key>stream_chans</key>
<value>[]</value>
</param>
<param>
<key>sync</key>
<value></value>
</param>
<param>
<key>len_tag_name</key>
<value></value>
</param>
<param>
<key>otw</key>
<value></value>
</param>
</block>
<connection>
<source_block_id>analog_random_source_x_0</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>blocks_multiply_const_vxx_0</source_block_id>
<sink_block_id>rational_resampler_xxx_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_multiply_const_vxx_0</source_block_id>
<sink_block_id>uhd_usrp_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>blocks_multiply_const_vxx_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>rational_resampler_xxx_0</source_block_id>
<sink_block_id>qtgui_sink_x_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
</flow_graph>
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