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[Commit-gnuradio] [gnuradio] 03/06: digital: Updated corr_est
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[Commit-gnuradio] [gnuradio] 03/06: digital: Updated corr_est |
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Wed, 15 Jun 2016 04:11:15 +0000 (UTC) |
This is an automated email from the git hooks/post-receive script.
jcorgan pushed a commit to branch packet3
in repository gnuradio.
commit 32d1c7d3188bf3107b45f350e44907cf23faee3e
Author: Tom Rondeau <address@hidden>
Date: Tue Jun 14 10:33:51 2016 -0700
digital: Updated corr_est
- Works with arbitrary scaling
- Summing correlation over two consecutive symbols because the
correlation power is spread out when the timing is off.
- Changing from a parabolic interpolation to a linear interpolation
measurement for the timing offset. Providing a linear estimate is
easier to use in downstream blocks to make adjustments.
---
gr-digital/examples/packet/example_corr_est.grc | 2530 +++++++++++++++++++++
gr-digital/include/gnuradio/digital/corr_est_cc.h | 8 +-
gr-digital/lib/corr_est_cc_impl.cc | 81 +-
gr-digital/lib/corr_est_cc_impl.h | 3 +
4 files changed, 2591 insertions(+), 31 deletions(-)
diff --git a/gr-digital/examples/packet/example_corr_est.grc
b/gr-digital/examples/packet/example_corr_est.grc
new file mode 100644
index 0000000..ca07ce1
--- /dev/null
+++ b/gr-digital/examples/packet/example_corr_est.grc
@@ -0,0 +1,2530 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.10'?>
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+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>packet_len</key>
+ <value>len(ac)+16</value>
+ </param>
+ <param>
+ <key>type</key>
+ <value>complex</value>
+ </param>
+ <param>
+ <key>vlen</key>
+ <value>1</value>
+ </param>
+ </block>
+ <block>
+ <key>blocks_throttle</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>(504, 107)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>id</key>
+ <value>blocks_throttle_0</value>
+ </param>
+ <param>
+ <key>ignoretag</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>samples_per_second</key>
+ <value>samp_rate</value>
+ </param>
+ <param>
+ <key>type</key>
+ <value>complex</value>
+ </param>
+ <param>
+ <key>vlen</key>
+ <value>1</value>
+ </param>
+ </block>
+ <block>
+ <key>blocks_vector_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>1</value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(16, 91)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>id</key>
+ <value>blocks_vector_source_x_0</value>
+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>type</key>
+ <value>complex</value>
+ </param>
+ <param>
+ <key>repeat</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>tags</key>
+ <value>[]</value>
+ </param>
+ <param>
+ <key>vlen</key>
+ <value>1</value>
+ </param>
+ <param>
+ <key>vector</key>
+ <value>[1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0] + ac</value>
+ </param>
+ </block>
+ <block>
+ <key>channels_channel_model</key>
+ <param>
+ <key>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>block_tags</key>
+ <value>True</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>epsilon</key>
+ <value>time_off</value>
+ </param>
+ <param>
+ <key>freq_offset</key>
+ <value>freq_off</value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(48, 203)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>id</key>
+ <value>channels_channel_model_0</value>
+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>noise_voltage</key>
+ <value>sps * 10.0**(noise/10.0)</value>
+ </param>
+ <param>
+ <key>seed</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>taps</key>
+ <value>10.0**(-path_loss/20.0)</value>
+ </param>
+ </block>
+ <block>
+ <key>digital_corr_est_cc</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>_coordinate</key>
+ <value>(264, 211)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>id</key>
+ <value>digital_corr_est_cc_0</value>
+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>sps</key>
+ <value>sps</value>
+ </param>
+ <param>
+ <key>scale_factor</key>
+ <value>1.0</value>
+ </param>
+ <param>
+ <key>symbols</key>
+ <value>modulated_sync_word</value>
+ </param>
+ <param>
+ <key>mark_delay</key>
+ <value>mark_delay</value>
+ </param>
+ <param>
+ <key>threshold</key>
+ <value>0.999</value>
+ </param>
+ </block>
+ <block>
+ <key>fir_filter_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>decim</key>
+ <value>1</value>
+ </param>
+ <param>
+ <key>_enabled</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(528, 219)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>id</key>
+ <value>fir_filter_xxx_0</value>
+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>samp_delay</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>taps</key>
+ <value>rx_psf_taps</value>
+ </param>
+ <param>
+ <key>type</key>
+ <value>ccc</value>
+ </param>
+ </block>
+ <block>
+ <key>interp_fir_filter_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>_coordinate</key>
+ <value>(896, 99)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>id</key>
+ <value>interp_fir_filter_xxx_0</value>
+ </param>
+ <param>
+ <key>interp</key>
+ <value>sps</value>
+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>samp_delay</key>
+ <value>filt_delay</value>
+ </param>
+ <param>
+ <key>taps</key>
+ <value>rrc_taps</value>
+ </param>
+ <param>
+ <key>type</key>
+ <value>ccc</value>
+ </param>
+ </block>
+ <block>
+ <key>qtgui_time_sink_x</key>
+ <param>
+ <key>autoscale</key>
+ <value>False</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>(720, 211)</value>
+ </param>
+ <param>
+ <key>gui_hint</key>
+ <value>2,0,1,2</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</value>
+ </param>
+ <param>
+ <key>legend</key>
+ <value>False</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>-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></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></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>
+ <param>
+ <key>marker6</key>
+ <value>-1</value>
+ </param>
+ <param>
+ <key>style6</key>
+ <value>1</value>
+ </param>
+ <param>
+ <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>
+ </param>
+ <param>
+ <key>marker7</key>
+ <value>-1</value>
+ </param>
+ <param>
+ <key>style7</key>
+ <value>1</value>
+ </param>
+ <param>
+ <key>width7</key>
+ <value>1</value>
+ </param>
+ <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>
+ <param>
+ <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>
+ </param>
+ <param>
+ <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>1</value>
+ </param>
+ <param>
+ <key>size</key>
+ <value>512</value>
+ </param>
+ <param>
+ <key>srate</key>
+ <value>1</value>
+ </param>
+ <param>
+ <key>tr_chan</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>tr_delay</key>
+ <value>15</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_start</value>
+ </param>
+ <param>
+ <key>type</key>
+ <value>complex</value>
+ </param>
+ <param>
+ <key>update_time</key>
+ <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>-1.5</value>
+ </param>
+ </block>
+ <block>
+ <key>qtgui_time_sink_x</key>
+ <param>
+ <key>autoscale</key>
+ <value>False</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>1</value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(528, 299)</value>
+ </param>
+ <param>
+ <key>gui_hint</key>
+ <value>address@hidden</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>False</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>-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></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></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>
+ <param>
+ <key>marker6</key>
+ <value>-1</value>
+ </param>
+ <param>
+ <key>style6</key>
+ <value>1</value>
+ </param>
+ <param>
+ <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>
+ </param>
+ <param>
+ <key>marker7</key>
+ <value>-1</value>
+ </param>
+ <param>
+ <key>style7</key>
+ <value>1</value>
+ </param>
+ <param>
+ <key>width7</key>
+ <value>1</value>
+ </param>
+ <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>
+ <param>
+ <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>
+ </param>
+ <param>
+ <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>1</value>
+ </param>
+ <param>
+ <key>size</key>
+ <value>512</value>
+ </param>
+ <param>
+ <key>srate</key>
+ <value>1</value>
+ </param>
+ <param>
+ <key>tr_chan</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>tr_delay</key>
+ <value>15</value>
+ </param>
+ <param>
+ <key>tr_level</key>
+ <value>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>0.10</value>
+ </param>
+ <param>
+ <key>ylabel</key>
+ <value>Amplitude</value>
+ </param>
+ <param>
+ <key>yunit</key>
+ <value>""</value>
+ </param>
+ <param>
+ <key>ymax</key>
+ <value>100</value>
+ </param>
+ <param>
+ <key>ymin</key>
+ <value>-100</value>
+ </param>
+ </block>
+ <block>
+ <key>qtgui_time_sink_x</key>
+ <param>
+ <key>autoscale</key>
+ <value>False</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>1</value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(720, 371)</value>
+ </param>
+ <param>
+ <key>gui_hint</key>
+ <value>address@hidden</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_0</value>
+ </param>
+ <param>
+ <key>legend</key>
+ <value>False</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>-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></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></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>
+ <param>
+ <key>marker6</key>
+ <value>-1</value>
+ </param>
+ <param>
+ <key>style6</key>
+ <value>1</value>
+ </param>
+ <param>
+ <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>
+ </param>
+ <param>
+ <key>marker7</key>
+ <value>-1</value>
+ </param>
+ <param>
+ <key>style7</key>
+ <value>1</value>
+ </param>
+ <param>
+ <key>width7</key>
+ <value>1</value>
+ </param>
+ <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>
+ <param>
+ <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>
+ </param>
+ <param>
+ <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>1</value>
+ </param>
+ <param>
+ <key>size</key>
+ <value>512</value>
+ </param>
+ <param>
+ <key>srate</key>
+ <value>1</value>
+ </param>
+ <param>
+ <key>tr_chan</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>tr_delay</key>
+ <value>15</value>
+ </param>
+ <param>
+ <key>tr_level</key>
+ <value>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>float</value>
+ </param>
+ <param>
+ <key>update_time</key>
+ <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>4000</value>
+ </param>
+ <param>
+ <key>ymin</key>
+ <value>-100</value>
+ </param>
+ </block>
+ <block>
+ <key>qtgui_tab_widget</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>(296, 435)</value>
+ </param>
+ <param>
+ <key>gui_hint</key>
+ <value></value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>id</key>
+ <value>tab0</value>
+ </param>
+ <param>
+ <key>label0</key>
+ <value>Corr</value>
+ </param>
+ <param>
+ <key>label1</key>
+ <value>|Corr|^2</value>
+ </param>
+ <param>
+ <key>label10</key>
+ <value>Tab 10</value>
+ </param>
+ <param>
+ <key>label11</key>
+ <value>Tab 11</value>
+ </param>
+ <param>
+ <key>label12</key>
+ <value>Tab 12</value>
+ </param>
+ <param>
+ <key>label13</key>
+ <value>Tab 13</value>
+ </param>
+ <param>
+ <key>label14</key>
+ <value>Tab 14</value>
+ </param>
+ <param>
+ <key>label15</key>
+ <value>Tab 15</value>
+ </param>
+ <param>
+ <key>label16</key>
+ <value>Tab 16</value>
+ </param>
+ <param>
+ <key>label17</key>
+ <value>Tab 17</value>
+ </param>
+ <param>
+ <key>label18</key>
+ <value>Tab 18</value>
+ </param>
+ <param>
+ <key>label19</key>
+ <value>Tab 19</value>
+ </param>
+ <param>
+ <key>label2</key>
+ <value>Tab 2</value>
+ </param>
+ <param>
+ <key>label3</key>
+ <value>Tab 3</value>
+ </param>
+ <param>
+ <key>label4</key>
+ <value>Tab 4</value>
+ </param>
+ <param>
+ <key>label5</key>
+ <value>Tab 5</value>
+ </param>
+ <param>
+ <key>label6</key>
+ <value>Tab 6</value>
+ </param>
+ <param>
+ <key>label7</key>
+ <value>Tab 7</value>
+ </param>
+ <param>
+ <key>label8</key>
+ <value>Tab 8</value>
+ </param>
+ <param>
+ <key>label9</key>
+ <value>Tab 9</value>
+ </param>
+ <param>
+ <key>num_tabs</key>
+ <value>2</value>
+ </param>
+ </block>
+ <connection>
+ <source_block_id>blocks_add_const_vxx_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_complex_to_mag_squared_0</source_block_id>
+ <sink_block_id>qtgui_time_sink_x_0_0_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>blocks_add_const_vxx_0</sink_block_id>
+ <source_key>0</source_key>
+ <sink_key>0</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>blocks_stream_to_tagged_stream_0</source_block_id>
+ <sink_block_id>interp_fir_filter_xxx_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>blocks_stream_to_tagged_stream_0</sink_block_id>
+ <source_key>0</source_key>
+ <sink_key>0</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>blocks_vector_source_x_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>channels_channel_model_0</source_block_id>
+ <sink_block_id>digital_corr_est_cc_0</sink_block_id>
+ <source_key>0</source_key>
+ <sink_key>0</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>digital_corr_est_cc_0</source_block_id>
+ <sink_block_id>blocks_complex_to_mag_squared_0</sink_block_id>
+ <source_key>1</source_key>
+ <sink_key>0</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>digital_corr_est_cc_0</source_block_id>
+ <sink_block_id>qtgui_time_sink_x_0_0</sink_block_id>
+ <source_key>1</source_key>
+ <sink_key>0</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>digital_corr_est_cc_0</source_block_id>
+ <sink_block_id>fir_filter_xxx_0</sink_block_id>
+ <source_key>0</source_key>
+ <sink_key>0</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>fir_filter_xxx_0</source_block_id>
+ <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+ <source_key>0</source_key>
+ <sink_key>0</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>interp_fir_filter_xxx_0</source_block_id>
+ <sink_block_id>channels_channel_model_0</sink_block_id>
+ <source_key>0</source_key>
+ <sink_key>0</sink_key>
+ </connection>
+</flow_graph>
diff --git a/gr-digital/include/gnuradio/digital/corr_est_cc.h
b/gr-digital/include/gnuradio/digital/corr_est_cc.h
index e8211cf..237a499 100644
--- a/gr-digital/include/gnuradio/digital/corr_est_cc.h
+++ b/gr-digital/include/gnuradio/digital/corr_est_cc.h
@@ -42,6 +42,7 @@ namespace gr {
* \li tag 'phase_est': estimate of phase offset
* \li tag 'time_est': estimate of symbol timing offset
* \li tag 'corr_est': the correlation value of the estimates
+ * \li tag 'amp_est': 1 over the estimated amplitude
* \li tag 'corr_start': the start sample of the correlation and the value
*
* \li Optional 2nd output stream providing the advanced correlator output
@@ -51,12 +52,11 @@ namespace gr {
* offset estimate. These estimates are passed downstream as
* stream tags for use by follow-on synchronization blocks.
*
- * The sync word is provided as a set of symbols along with a
- * baseband matched filter which we use to create the filtered and
- * upsampled symbols that we will receive over-the-air.
+ * The sync word is provided as a set of symbols after being
+ * filtered by a baseband matched filter.
*
* The phase_est tag can be used by downstream blocks to adjust
- * their phase estimatopm/correction loops, and is currently
+ * their phase estimator/correction loops, and is currently
* implemented by the gr::digital::costas_loop_cc block.
*
* The time_est tag can be used to adjust the sampling timing
diff --git a/gr-digital/lib/corr_est_cc_impl.cc
b/gr-digital/lib/corr_est_cc_impl.cc
index 772fc78..dfcd966 100644
--- a/gr-digital/lib/corr_est_cc_impl.cc
+++ b/gr-digital/lib/corr_est_cc_impl.cc
@@ -55,6 +55,17 @@ namespace gr {
{
d_sps = sps;
+ // In order to easily support the optional second output,
+ // don't deal with an unbounded max number of output items.
+ // For the common case of not using the optional second output,
+ // this ensures we optimally call the volk routines.
+ const size_t nitems = 24*1024;
+ set_max_noutput_items(nitems);
+ d_corr = (gr_complex *)
+ volk_malloc(sizeof(gr_complex)*nitems, volk_get_alignment());
+ d_corr_mag = (float *)
+ volk_malloc(sizeof(float)*nitems, volk_get_alignment());
+
// Create time-reversed conjugate of symbols
d_symbols = symbols;
for(size_t i=0; i < d_symbols.size(); i++) {
@@ -96,16 +107,7 @@ namespace gr {
// volk_get_alignment() / sizeof(gr_complex);
//set_alignment(std::max(1,alignment_multiple));
- // In order to easily support the optional second output,
- // don't deal with an unbounded max number of output items.
- // For the common case of not using the optional second output,
- // this ensures we optimally call the volk routines.
- const size_t nitems = 24*1024;
- set_max_noutput_items(nitems);
- d_corr = (gr_complex *)
- volk_malloc(sizeof(gr_complex)*nitems, volk_get_alignment());
- d_corr_mag = (float *)
- volk_malloc(sizeof(float)*nitems, volk_get_alignment());
+ d_scale = 1.0f;
}
corr_est_cc_impl::~corr_est_cc_impl()
@@ -193,14 +195,7 @@ namespace gr {
corr_est_cc_impl::_set_threshold(float threshold)
{
d_stashed_threshold = threshold;
-
- // Compute a correlation threshold.
- // Compute the value of the discrete autocorrelation of the matched
- // filter with offset 0 (aka the autocorrelation peak).
- float corr = 0;
- for(size_t i = 0; i < d_symbols.size(); i++)
- corr += abs(d_symbols[i]*conj(d_symbols[i]));
- d_thresh = threshold*corr*corr;
+ d_pfa = -logf(1.0f-threshold);
}
void
@@ -228,10 +223,6 @@ namespace gr {
// Our correlation filter length
unsigned int hist_len = history() - 1;
- // Delay the output by our correlation filter length so we can
- // tag backwards in time
- memcpy(out, &in[0], sizeof(gr_complex)*noutput_items);
-
// Calculate the correlation of the non-delayed input with the
// known symbols.
d_filter->filter(noutput_items, &in[hist_len], corr);
@@ -239,19 +230,31 @@ namespace gr {
// Find the magnitude squared of the correlation
volk_32fc_magnitude_squared_32f(&d_corr_mag[0], corr, noutput_items);
+ float detection = 0;
+ for(int i = 0; i < noutput_items; i++) {
+ detection += d_corr_mag[i];
+ }
+ detection /= static_cast<float>(noutput_items);
+ detection *= d_pfa;
+
int isps = (int)(d_sps + 0.5f);
int i = 0;
while(i < noutput_items) {
- // Look for the correlator output to cross the threshold
- if (d_corr_mag[i] <= d_thresh) {
+ // Look for the correlator output to cross the threshold.
+ // Sum power over two consecutive symbols in case we're offset
+ // in time. If off by 1/2 a symbol, the peak of any one point
+ // is much lower.
+ float corr_mag = d_corr_mag[i] + d_corr_mag[i+1];
+ if(corr_mag <= 4*detection) {
i++;
continue;
}
+
// Go to (just past) the current correlator output peak
while ((i < (noutput_items-1)) &&
- (d_corr_mag[i] < d_corr_mag[i+1]))
+ (d_corr_mag[i] < d_corr_mag[i+1])) {
i++;
-
+ }
// Delaying the primary signal output by the matched filter
// length using history(), means that the the peak output of
// the matched filter aligns with the start of the desired
@@ -262,8 +265,9 @@ namespace gr {
add_item_tag(0, nitems_written(0) + i, pmt::intern("corr_start"),
pmt::from_double(d_corr_mag[i]), d_src_id);
+#if 0
// Use Parabolic interpolation to estimate a fractional
- // sample delay. There are more accurate methods as
+ // sample delay. There are more accurate methods as
// the sample delay estimate using this method is biased.
// But this method is simple and fast.
// center between [-0.5,0.5] units of samples
@@ -275,6 +279,21 @@ namespace gr {
double denom = 2*(d_corr_mag[i-1]-2*d_corr_mag[i]+d_corr_mag[i+1]);
center = nom/denom;
}
+#else
+ // Calculates the center of mass between the three points around the
peak.
+ // Estimate is linear.
+ double nom = 0, den = 0;
+ nom = d_corr_mag[i-1] + 2*d_corr_mag[i] + 3*d_corr_mag[i+1];
+ den = d_corr_mag[i-1] + d_corr_mag[i] + d_corr_mag[i+1];
+ double center = nom / den;
+ center = (center - 2.0); // adjust for bias in center of mass
calculation
+#endif
+
+ // Estimated scaling factor for the input stream to normalize
+ // the output to +/-1.
+ uint32_t maxi;
+ volk_32fc_index_max_16u(&maxi, (gr_complex*)in, noutput_items);
+ d_scale = 1 / std::abs(in[maxi]);
// Calculate the phase offset of the incoming signal.
//
@@ -304,6 +323,8 @@ namespace gr {
// N.B. the appropriate d_corr_mag[] index is "i", not "index".
add_item_tag(0, nitems_written(0) + index, pmt::intern("corr_est"),
pmt::from_double(d_corr_mag[i]), d_src_id);
+ add_item_tag(0, nitems_written(0) + index, pmt::intern("amp_est"),
+ pmt::from_double(d_scale), d_src_id);
if (output_items.size() > 1) {
// N.B. these debug tags are not offset to avoid walking off out buf
@@ -313,6 +334,8 @@ namespace gr {
pmt::from_double(center), d_src_id);
add_item_tag(1, nitems_written(0) + i, pmt::intern("corr_est"),
pmt::from_double(d_corr_mag[i]), d_src_id);
+ add_item_tag(1, nitems_written(0) + i, pmt::intern("amp_est"),
+ pmt::from_double(d_scale), d_src_id);
}
// Skip ahead to the next potential symbol peak
@@ -325,6 +348,10 @@ namespace gr {
// pmt::intern("ce_eow"), pmt::from_uint64(noutput_items),
// d_src_id);
+ // Delay the output by our correlation filter length so we can
+ // tag backwards in time
+ memcpy(out, &in[0], sizeof(gr_complex)*noutput_items);
+
return noutput_items;
}
diff --git a/gr-digital/lib/corr_est_cc_impl.h
b/gr-digital/lib/corr_est_cc_impl.h
index 6e8dd17..e0d4c8e 100644
--- a/gr-digital/lib/corr_est_cc_impl.h
+++ b/gr-digital/lib/corr_est_cc_impl.h
@@ -44,6 +44,9 @@ namespace gr {
gr_complex *d_corr;
float *d_corr_mag;
+ float d_scale;
+ float d_pfa; // probability of false alarm
+
void _set_mark_delay(unsigned int mark_delay);
void _set_threshold(float threshold);
- [Commit-gnuradio] [gnuradio] branch packet3 created (now b9c0d10), git, 2016/06/15
- [Commit-gnuradio] [gnuradio] 04/06: digital: pfb_clock_sync_ccf tag offset update., git, 2016/06/15
- [Commit-gnuradio] [gnuradio] 01/06: runtime: executor fixes for tag propagation, git, 2016/06/15
- [Commit-gnuradio] [gnuradio] 02/06: blocks: Add `multiply tag by value' and `test tag variable rate' blocks, git, 2016/06/15
- [Commit-gnuradio] [gnuradio] 03/06: digital: Updated corr_est,
git <=
- [Commit-gnuradio] [gnuradio] 05/06: digital: Complete overhaul of protocol handling, git, 2016/06/15
- [Commit-gnuradio] [gnuradio] 06/06: digital: Added lots and lots of examples for overhauled packet format, git, 2016/06/15