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Increased robustness of feed-forward freq. correction

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- Increased pilot sequence length to 16 symbols
- Calculate phase difference from start for all symbols instead of
  averaging over pilot blocks
This commit is contained in:
Thomas Kolb 2019-09-14 23:36:04 +02:00
commit da4c9e08d4
4 changed files with 495 additions and 9 deletions
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355
tmp/test_sc16qam.grc
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@ -794,6 +794,353 @@
<value>import numpy as np</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>(726, 403)</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>
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<key>alpha1</key>
<value>1.0</value>
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<key>color1</key>
<value>"blue"</value>
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<key>label1</key>
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<value>1</value>
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<key>color8</key>
<value>"red"</value>
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<key>color9</key>
<value>"red"</value>
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<key>label9</key>
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<key>style9</key>
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<param>
<key>width9</key>
<value>1</value>
</param>
<param>
<key>name</key>
<value>"Synced symbols"</value>
</param>
<param>
<key>nconnections</key>
<value>1</value>
</param>
<param>
<key>size</key>
<value>2048</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_TAG</value>
</param>
<param>
<key>tr_slope</key>
<value>qtgui.TRIG_SLOPE_POS</value>
</param>
<param>
<key>tr_tag</key>
<value>"corr_est"</value>
</param>
<param>
<key>type</key>
<value>complex</value>
</param>
<param>
<key>update_time</key>
<value>0.5</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>
@ -1383,7 +1730,7 @@
</param>
<param>
<key>_enabled</key>
<value>1</value>
<value>0</value>
</param>
<param>
<key>fftsize</key>
@ -2254,6 +2601,12 @@
<source_key>pdu_out</source_key>
<sink_key>print_pdu</sink_key>
</connection>
<connection>
<source_block_id>hamnet70_demod_sc16qam_0</source_block_id>
<sink_block_id>qtgui_const_sink_x_0</sink_block_id>
<source_key>1</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>hamnet70_demod_sc16qam_0</source_block_id>
<sink_block_id>qtgui_sink_x_1</sink_block_id>