Re: [Discuss-gnuradio] PSK/QAM Demodulation Issue

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<timestamp>Thu May 18 22:02:25 2017</timestamp>
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<value>dbpsk</value>
</param>
<param>
<key>verbose</key>
<value>False</value>
</param>
</block>
<block>
<key>digital_dxpsk_mod</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>excess_bw</key>
<value>0.35</value>
</param>
<param>
<key>_coordinate</key>
<value>(496, 528)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>mod_code</key>
<value>"gray"</value>
</param>
<param>
<key>id</key>
<value>digital_dxpsk_mod_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>type</key>
<value>dbpsk</value>
</param>
<param>
<key>verbose</key>
<value>False</value>
</param>
</block>
<block>
<key>digital_map_bb</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>_coordinate</key>
<value>(672, 268)</value>
</param>
<param>
<key>_rotation</key>
<value>180</value>
</param>
<param>
<key>id</key>
<value>digital_map_bb_0_0</value>
</param>
<param>
<key>map</key>
<value>b_gray_codes</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</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>1</value>
</param>
<param>
<key>filter_size</key>
<value>nfilts</value>
</param>
<param>
<key>_coordinate</key>
<value>(744, 128)</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>nfilts/2</value>
</param>
<param>
<key>loop_bw</key>
<value>timing_loop_bw</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>(16, 84)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>import_0</value>
</param>
<param>
<key>import</key>
<value>from numpy import log2 as log2</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>(752, 44)</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>1.0</value>
</param>
<param>
<key>color1</key>
<value>"blue"</value>
</param>
<param>
<key>label1</key>
<value></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>"constellation modulator"</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_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>(680, 652)</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_0</value>
</param>
<param>
<key>legend</key>
<value>True</value>
</param>
<param>
<key>alpha1</key>
<value>1.0</value>
</param>
<param>
<key>color1</key>
<value>"blue"</value>
</param>
<param>
<key>label1</key>
<value></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>"dbpsk"</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_time_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>ctrlpanel</key>
<value>False</value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>entags</key>
<value>True</value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(640, 340)</value>
</param>
<param>
<key>gui_hint</key>
<value>2,1,1,1</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>grid</key>
<value>False</value>
</param>
<param>
<key>id</key>
<value>qtgui_time_sink_x_0_0</value>
</param>
<param>
<key>legend</key>
<value>True</value>
</param>
<param>
<key>alpha1</key>
<value>1.0</value>
</param>
<param>
<key>color1</key>
<value>"blue"</value>
</param>
<param>
<key>label1</key>
<value>Constellation Mod Bits</value>
</param>
<param>
<key>marker1</key>
<value>-1</value>
</param>
<param>
<key>style1</key>
<value>1</value>
</param>
<param>
<key>width1</key>
<value>1</value>
</param>
<param>
<key>alpha10</key>
<value>1.0</value>
</param>
<param>
<key>color10</key>
<value>"blue"</value>
</param>
<param>
<key>label10</key>
<value></value>
</param>
<param>
<key>marker10</key>
<value>-1</value>
</param>
<param>
<key>style10</key>
<value>1</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>DBPSK Bits</value>
</param>
<param>
<key>marker2</key>
<value>-1</value>
</param>
<param>
<key>style2</key>
<value>1</value>
</param>
<param>
<key>width2</key>
<value>1</value>
</param>
<param>
<key>alpha3</key>
<value>1.0</value>
</param>
<param>
<key>color3</key>
<value>"green"</value>
</param>
<param>
<key>label3</key>
<value>difference</value>
</param>
<param>
<key>marker3</key>
<value>-1</value>
</param>
<param>
<key>style3</key>
<value>1</value>
</param>
<param>
<key>width3</key>
<value>1</value>
</param>
<param>
<key>alpha4</key>
<value>1.0</value>
</param>
<param>
<key>color4</key>
<value>"black"</value>
</param>
<param>
<key>label4</key>
<value></value>
</param>
<param>
<key>marker4</key>
<value>-1</value>
</param>
<param>
<key>style4</key>
<value>1</value>
</param>
<param>
<key>width4</key>
<value>1</value>
</param>
<param>
<key>alpha5</key>
<value>1.0</value>
</param>
<param>
<key>color5</key>
<value>"cyan"</value>
</param>
<param>
<key>label5</key>
<value></value>
</param>
<param>
<key>marker5</key>
<value>-1</value>
</param>
<param>
<key>style5</key>
<value>1</value>
</param>
<param>
<key>width5</key>
<value>1</value>
</param>
<param>
<key>alpha6</key>
<value>1.0</value>
</param>
<param>
<key>color6</key>
<value>"magenta"</value>
</param>
<param>
<key>label6</key>
<value></value>
</param>
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<key>marker6</key>
<value>-1</value>
</param>
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<key>style6</key>
<value>1</value>
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<key>width6</key>
<value>1</value>
</param>
<param>
<key>alpha7</key>
<value>1.0</value>
</param>
<param>
<key>color7</key>
<value>"yellow"</value>
</param>
<param>
<key>label7</key>
<value></value>
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<key>marker7</key>
<value>-1</value>
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<key>style7</key>
<value>1</value>
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<key>width7</key>
<value>1</value>
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<param>
<key>alpha8</key>
<value>1.0</value>
</param>
<param>
<key>color8</key>
<value>"dark red"</value>
</param>
<param>
<key>label8</key>
<value></value>
</param>
<param>
<key>marker8</key>
<value>-1</value>
</param>
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<key>style8</key>
<value>1</value>
</param>
<param>
<key>width8</key>
<value>1</value>
</param>
<param>
<key>alpha9</key>
<value>1.0</value>
</param>
<param>
<key>color9</key>
<value>"dark green"</value>
</param>
<param>
<key>label9</key>
<value></value>
</param>
<param>
<key>marker9</key>
<value>-1</value>
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<key>style9</key>
<value>1</value>
</param>
<param>
<key>width9</key>
<value>1</value>
</param>
<param>
<key>name</key>
<value></value>
</param>
<param>
<key>nconnections</key>
<value>2</value>
</param>
<param>
<key>size</key>
<value>500</value>
</param>
<param>
<key>srate</key>
<value>samp_rate</value>
</param>
<param>
<key>tr_chan</key>
<value>0</value>
</param>
<param>
<key>tr_delay</key>
<value>0</value>
</param>
<param>
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</param>
<param>
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<value>qtgui.TRIG_MODE_FREE</value>
</param>
<param>
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</param>
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<value>""</value>
</param>
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<value>float</value>
</param>
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<value>0.10</value>
</param>
<param>
<key>ylabel</key>
<value>Amplitude</value>
</param>
<param>
<key>yunit</key>
<value>""</value>
</param>
<param>
<key>ymax</key>
<value>1.5</value>
</param>
<param>
<key>ymin</key>
<value>-.5</value>
</param>
</block>
<connection>
<source_block_id>analog_random_source_x_0</source_block_id>
<sink_block_id>blocks_throttle_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_char_to_float_0_0</source_block_id>
<sink_block_id>blocks_delay_0_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_char_to_float_0_0_1</source_block_id>
<sink_block_id>qtgui_time_sink_x_0_0</sink_block_id>
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<sink_key>1</sink_key>
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</connection>
<connection>
<source_block_id>blocks_throttle_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_throttle_0</source_block_id>
<sink_block_id>digital_dxpsk_mod_0</sink_block_id>
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<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>blocks_unpack_k_bits_bb_0_0</source_block_id>
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<connection>
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<connection>
<source_block_id>digital_constellation_decoder_cb_0</source_block_id>
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<sink_key>0</sink_key>
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<connection>
<source_block_id>digital_constellation_modulator_0</source_block_id>
<sink_block_id>digital_pfb_clock_sync_xxx_0</sink_block_id>
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<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_constellation_modulator_0</source_block_id>
<sink_block_id>qtgui_const_sink_x_0</sink_block_id>
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<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_diff_decoder_bb_0_0</source_block_id>
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<connection>
<source_block_id>digital_dxpsk_demod_0</source_block_id>
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<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_dxpsk_mod_0</source_block_id>
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<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_dxpsk_mod_0</source_block_id>
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<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_map_bb_0_0</source_block_id>
<sink_block_id>digital_diff_decoder_bb_0_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>
</flow_graph>
On 05/18/2017 05:33 AM, Mojtaba Mansour Abadi wrote:
> Thanks a lot Cinaed for the tips, in particular, the symmetry order and
> CMA equaliser.
>
> I did what you suggested about sps variable. However, it didn't help.

If it was working under DPSK Mod/DPSK Demond, then all you have to do is
replace DPSK Mod with Constellation Mod, and DPSK Demod with Polyphase
Clock Sync, Constellation Decoder, Map, and Differential Decoder.

See the enclosed constel-dpsk-test.grc flow graph.

>
> Besides as far as I know form GNURadio documentation, samples/symbol is
> referring to the samples representing a single constellation symbol so
> increasing this parameter is equivalent to interpolating the signal. It
> doesn't have to do anything with the modulation scheme. Please correct
> me if I am wrong.

You're probably right - I haven't read the documentation yet.

>
> Cheers,
>
> Mansour.
>
>
>
>
> On 17 May 2017 at 21:43, Cinaed Simson <cinaed.simson@gmail.com
> <mailto:cinaed.simson@gmail.com>> wrote:
>
> m-psk for m=2, has 2 samples/symbol and log2(m)=1 - or 1 bit per symbol.
>
> Also, the polyphase clock has an input of 4 samples and output of 1 sps.
> It should have input of 2 sps and output of 1 sps.
>
> Just change the sps everywhere to 2.
>
> Also, note there are only 2 symbols in the symbol map of the
> Constellation object so for sps equal to 2 the symmetry is 2 - or there
> will be 2 clusters on a horizontal straight line.
>
> Except when you use a tap in the Channel Model of 1+1j which will
> probably rotate the line by 45 degrees to the horizontal.
>
> In any case, this is known as bpsk - or your case dbpsk - differential
> bpsk.
>
> I would add the CMA Equalizer between the Polyphase clock and Costa
> Loop.
>
> -- Cinaed
>
>
>
> On 05/17/2017 08:59 AM, Mojtaba Mansour Abadi wrote:
> > Hi Everyone,
> >
> > The flowgraph I am implementing is simple and straight forward. I am
> > modulating a set of data plus preamble. The modulations I am
> looking at
> > are either PSK or QAM. After a block of "Channel Model" in the
> > flowgraph, I want to demodulate the signal and obviously, for fair SNR
> > values I should receive the same preamble and data values.
> >
> > Now the problem is that when I use the deprecated "PSK/QAM Mod" and
> > "PSK/QAM Demod", everything works fine. However, based on the examples
> > in "/digital/demod" and "/digital/packet" shiped with
> > gnuradio companion, when I try to use the "FLL Band-Edge" followed by
> > "Correlation Estimator", "Polyphase Clock Sync", and "Costas Loop" to
> > compensate the channel for PSK modulation, the results I am
> getting are
> > not correct (see the attached picture and file).
> >
> > It would be your kind if you could answer my questions please:
> >
> > 1- What is the correct way of demodulating the received signal?
> > 2- In the provided examples, no equalizer is used after "Polyphase
> Clock
> > Sync", whereas in a tutorial available at Gnuradio website a "CMA
> > Equaliser" is needed there. So which one is the correct one?
> > 3- If I move to QAM modulation, the only thing I need to do would be
> > replacing "Costas Loop" with a "Constellation Receiver", right?
> >
> > Cheers.
> >
> > Regards,
> > Mansour.
> >
> > https://www.linkedin.com/in/mojtaba-mansour-abadi-4311b451
> <https://www.linkedin.com/in/mojtaba-mansour-abadi-4311b451>
> >
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org>
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
> >
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org>
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
>
>
>
>
> --
> Regards,
> Mansour.
>
> https://www.linkedin.com/in/mojtaba-mansour-abadi-4311b451
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>