mirror of
https://github.com/hb9fxq/gr-digitalhf
synced 2024-12-22 15:10:00 +00:00
recentering of filter taps
This commit is contained in:
cmayer
parent
ec9ce59cb3
commit
3fdf3ffa63
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@ -158,6 +158,9 @@ if(NOT CPPUNIT_FOUND)
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message(FATAL_ERROR "CppUnit required to compile digitalhf")
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endif()
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include(GrMiscUtils)
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GR_LOGGING()
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########################################################################
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# Setup doxygen option
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########################################################################
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@ -317,7 +317,7 @@
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</param>
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<param>
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<key>value</key>
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<value>0.002</value>
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<value>0.001</value>
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</param>
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<param>
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<key>_enabled</key>
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@ -353,15 +353,15 @@
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</param>
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<param>
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<key>start</key>
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<value>0</value>
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<value>0.0001</value>
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</param>
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<param>
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<key>step</key>
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<value>0.001</value>
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<value>0.0001</value>
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</param>
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<param>
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<key>stop</key>
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<value>0.02</value>
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<value>0.01</value>
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</param>
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<param>
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<key>rangeType</key>
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@ -396,7 +396,7 @@
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</param>
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<param>
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<key>value</key>
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<value>15</value>
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<value>9</value>
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</param>
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</block>
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<block>
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@ -423,7 +423,7 @@
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</param>
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<param>
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<key>value</key>
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<value>15</value>
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<value>9</value>
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</param>
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</block>
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<block>
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@ -453,6 +453,49 @@
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<value>4</value>
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</param>
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</block>
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<block>
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<key>variable_rrc_filter_taps</key>
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<param>
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<key>comment</key>
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<value></value>
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</param>
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<param>
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<key>_enabled</key>
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<value>True</value>
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</param>
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<param>
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<key>alpha</key>
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<value>0.25</value>
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</param>
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<param>
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<key>_coordinate</key>
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<value>(469, 352)</value>
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</param>
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<param>
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<key>_rotation</key>
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<value>0</value>
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</param>
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<param>
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<key>gain</key>
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<value>1.0</value>
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</param>
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<param>
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<key>id</key>
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<value>rrc_taps</value>
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</param>
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<param>
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<key>ntaps</key>
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<value>11*sps</value>
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</param>
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<param>
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<key>samp_rate</key>
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<value>samp_rate</value>
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</param>
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<param>
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<key>sym_rate</key>
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<value>samp_rate/sps</value>
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</param>
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</block>
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<block>
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<key>variable</key>
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<param>
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@ -477,7 +520,7 @@
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</param>
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<param>
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<key>value</key>
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<value>12000</value>
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<value>12001</value>
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</param>
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</block>
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<block>
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@ -774,7 +817,7 @@
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</param>
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<param>
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<key>file</key>
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<value>/Users/chm/Downloads/julusdalen.proxy.kiwisdr.com_2018-10-28T17_36_28Z_4644.80_iq.wav</value>
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<value>/Users/chm/Downloads/kiwi-sm2gct.mooo.com_2018-10-30T10_35_39Z_8700.00_iq.wav</value>
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</param>
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<param>
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<key>_coordinate</key>
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@ -876,6 +919,112 @@
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<value>STANAG_4285</value>
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</param>
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</block>
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<block>
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<key>fir_filter_xxx</key>
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<param>
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<key>alias</key>
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<value></value>
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</param>
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<param>
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<key>comment</key>
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<value></value>
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</param>
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<param>
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<key>affinity</key>
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<value></value>
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</param>
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<param>
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<key>decim</key>
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<value>1</value>
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</param>
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<param>
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<key>_enabled</key>
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<value>True</value>
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</param>
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<param>
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<key>_coordinate</key>
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<value>(330, 293)</value>
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</param>
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<param>
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<key>_rotation</key>
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<value>0</value>
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</param>
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<param>
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<key>id</key>
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<value>fir_filter_xxx_0</value>
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</param>
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<param>
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<key>maxoutbuf</key>
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<value>0</value>
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</param>
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<param>
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<key>minoutbuf</key>
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<value>0</value>
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</param>
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<param>
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<key>samp_delay</key>
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<value>0</value>
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</param>
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<param>
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<key>taps</key>
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<value>rrc_taps</value>
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</param>
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<param>
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<key>type</key>
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<value>ccc</value>
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</param>
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</block>
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<block>
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<key>fractional_resampler_xx</key>
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<param>
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<key>alias</key>
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<value></value>
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</param>
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<param>
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<key>comment</key>
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<value></value>
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</param>
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<param>
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<key>affinity</key>
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<value></value>
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</param>
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<param>
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<key>_enabled</key>
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<value>1</value>
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</param>
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<param>
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<key>_coordinate</key>
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<value>(96, 293)</value>
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</param>
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<param>
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<key>_rotation</key>
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<value>0</value>
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</param>
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<param>
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<key>id</key>
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<value>fractional_resampler_xx_0</value>
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</param>
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<param>
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<key>maxoutbuf</key>
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<value>0</value>
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</param>
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<param>
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<key>minoutbuf</key>
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<value>0</value>
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</param>
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<param>
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<key>phase_shift</key>
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<value>0</value>
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</param>
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<param>
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<key>resamp_ratio</key>
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<value>12001./11999.*0+1</value>
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</param>
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<param>
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<key>type</key>
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<value>complex</value>
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</param>
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</block>
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<block>
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<key>import</key>
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<param>
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@ -2315,13 +2464,13 @@
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</connection>
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<connection>
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<source_block_id>blocks_multiply_const_vxx_0</source_block_id>
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<sink_block_id>blocks_throttle_0</sink_block_id>
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<sink_block_id>fractional_resampler_xx_0</sink_block_id>
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<source_key>0</source_key>
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<sink_key>0</sink_key>
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</connection>
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<connection>
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<source_block_id>blocks_throttle_0</source_block_id>
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<sink_block_id>preamble</sink_block_id>
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<sink_block_id>fir_filter_xxx_0</sink_block_id>
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<source_key>0</source_key>
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<sink_key>0</sink_key>
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</connection>
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@ -2349,6 +2498,18 @@
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<source_key>soft_dec</source_key>
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<sink_key>in</sink_key>
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</connection>
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<connection>
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<source_block_id>fir_filter_xxx_0</source_block_id>
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<sink_block_id>preamble</sink_block_id>
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<source_key>0</source_key>
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<sink_key>0</sink_key>
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</connection>
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<connection>
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<source_block_id>fractional_resampler_xx_0</source_block_id>
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<sink_block_id>blocks_throttle_0</sink_block_id>
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<source_key>0</source_key>
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<sink_key>0</sink_key>
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</connection>
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<connection>
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<source_block_id>preamble</source_block_id>
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<sink_block_id>blocks_complex_to_mag_0</sink_block_id>
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@ -22,9 +22,14 @@
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#include "config.h"
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#endif
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#include <gnuradio/io_signature.h>
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#include <boost/format.hpp>
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#include <gnuradio/expj.h>
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#include <gnuradio/io_signature.h>
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#include <gnuradio/logger.h>
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#include <volk/volk.h>
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#include "adaptive_dfe_impl.h"
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#define VOLK_SAFE_DELETE(x) \
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@ -96,6 +101,8 @@ adaptive_dfe_impl::adaptive_dfe_impl(int sps, // samples per symbol
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, _hist_symbols(nullptr)
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, _hist_sample_index(0)
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, _hist_symbol_index(0)
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, _ignore_filter_updates(0)
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, _saved_samples()
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, _sample_counter(0)
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, _constellations()
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, _npwr()
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@ -118,6 +125,8 @@ adaptive_dfe_impl::adaptive_dfe_impl(int sps, // samples per symbol
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, _ud(0)
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, _state(WAIT_FOR_PREAMBLE)
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{
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GR_LOG_DECLARE_LOGPTR(d_logger);
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GR_LOG_ASSIGN_LOGPTR(d_logger, "adaptive_dfe");
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message_port_register_out(_msg_port_name);
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}
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@ -152,11 +161,11 @@ adaptive_dfe_impl::general_work(int noutput_items,
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int nout = 0;
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int i = 0;
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for (; i<ninput_items[0] && nout < noutput_items; ++i) {
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for (; i<ninput_items[0] && nout < noutput_items;) {
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assert(nout < noutput_items);
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if (_state == WAIT_FOR_PREAMBLE) {
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insert_sample(in[i]);
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insert_sample(in[i++]);
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uint64_t offset = 0;
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float phase_est = 0;
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if (get_correlation_tag(i, offset, phase_est)) {
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@ -168,12 +177,14 @@ adaptive_dfe_impl::general_work(int noutput_items,
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_descrambled_symbols.clear();
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// _hist_sample_index = 0;
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_hist_symbol_index = 0;
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_ignore_filter_updates = 0;
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_saved_samples.clear();
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std::fill_n(_hist_symbols, 2*_nW, gr_complex(0));
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std::fill_n(_taps_samples, _nB+_nF+1, gr_complex(0));
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std::fill_n(_taps_symbols, _nW, gr_complex(0));
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_samples.clear();
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_phase = -phase_est;
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_taps_samples[_nB+1] = 1;
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_taps_samples[_nB+1] = 0.01;
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_taps_symbols[0] = 1;
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GILLock gil_lock;
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try {
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@ -224,11 +235,11 @@ adaptive_dfe_impl::general_work(int noutput_items,
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}
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continue;
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}
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_samples.push_back(in[i]);
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_samples.push_back(in[i++]);
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} // INITIAL_DOPPLER_ESTIMATE_CONTINUE
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if (_state == INITIAL_DOPPLER_ESTIMATE_CONTINUE) {
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std::cout << "INITIAL_DOPPLER_ESTIMATE_CONTINUE\n";
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GR_LOG_DEBUG(d_logger, "INITIAL_DOPPLER_ESTIMATE_CONTINUE");
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while (!_samples.empty() && nout < noutput_items) {
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insert_sample(_samples.back());
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_sample_counter += 1;
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@ -246,13 +257,15 @@ adaptive_dfe_impl::general_work(int noutput_items,
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if (_state == DO_FILTER) {
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if ((_sample_counter%_sps) == 0) {
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if (_symbol_counter == _symbols.size()) {
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if (_symbol_counter == _symbols.size()) { // frame is ready
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_symbol_counter = 0;
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GILLock gil_lock;
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try {
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// update doppler estimate
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update_doppler_information(_physicalLayer.attr("get_doppler")
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(complex_vector_to_ndarray(_descrambled_symbols),
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complex_vector_to_ndarray(_samples)));
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// publish soft decisions
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if (!_vec_soft_decisions.empty()) {
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unsigned int const bits_per_symbol = _constellations[_constellation_index]->bits_per_symbol();
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_msg_metadata = pmt::dict_add(_msg_metadata, pmt::mp("bits_per_symbol"), pmt::from_long(bits_per_symbol));
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@ -262,16 +275,31 @@ adaptive_dfe_impl::general_work(int noutput_items,
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_vec_soft_decisions.clear();
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}
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_samples.clear();
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// get information about the following frame
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update_frame_information(_physicalLayer.attr("get_frame")());
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} catch (boost::python::error_already_set const&) {
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PyErr_Print();
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}
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} // frame is ready
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if (_ignore_filter_updates == 0) {
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out[nout++] = filter();
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if (_symbol_counter+1 == _symbols.size())
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recenter_filter_taps();
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} else {
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_ignore_filter_updates -= 1;
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}
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out[nout++] = filter();
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}
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insert_sample(in[i]);
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if (_need_samples)
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} // (_sample_counter%_sps) == 0
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if (_need_samples) {
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_samples.push_back(_hist_samples[_hist_sample_index+_nB+1]);
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}
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if (_saved_samples.empty()) {
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insert_sample(in[i++]);
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} else {
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insert_sample(_saved_samples.back());
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_saved_samples.pop_back();
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}
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_sample_counter += 1;
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} // DO_FILTER
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} // next input sample
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@ -306,10 +334,11 @@ bool adaptive_dfe_impl::start()
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std::fill_n(_taps_samples, (_nB+_nF+1), gr_complex(0));
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std::fill_n(_taps_symbols, _nW, gr_complex(0));
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_taps_samples[_nB+1] = 1;
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_taps_samples[_nB+1] = 0.01;
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_taps_symbols[0] = 1;
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std::cout << "adaptive_dfe_impl::start() " << _nB << " " << _nF << " " << _mu << " " << _alpha << std::endl;
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GR_LOG_DEBUG(d_logger,str(boost::format("adaptive_dfe_impl::start() nB=%d nF=%d mu=%f alpha=%f")
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% _nB % _nF % _mu % _alpha));
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GILLock gil_lock;
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try {
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boost::python::object module = boost::python::import(boost::python::str("digitalhf.physical_layer." + _py_module_name));
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@ -325,7 +354,7 @@ bool adaptive_dfe_impl::start()
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bool adaptive_dfe_impl::stop()
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{
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gr::thread::scoped_lock lock(d_setlock);
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std::cout << "adaptive_dfe_impl::stop()" << std::endl;
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GR_LOG_DEBUG(d_logger, "adaptive_dfe_impl::stop()");
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GILLock gil_lock;
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_physicalLayer = boost::python::object();
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VOLK_SAFE_DELETE(_taps_samples);
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@ -334,6 +363,7 @@ bool adaptive_dfe_impl::stop()
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VOLK_SAFE_DELETE(_hist_symbols);
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return true;
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}
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gr_complex adaptive_dfe_impl::filter() {
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gr_complex filter_output = 0;
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volk_32fc_x2_dot_prod_32fc(&filter_output,
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@ -371,17 +401,10 @@ gr_complex adaptive_dfe_impl::filter() {
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known_symbol = _scramble[_symbol_counter] * descrambled_symbol;
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}
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gr_complex err = filter_output - known_symbol;
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int jMax=0;
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float tMax=0;
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for (int j=0; j<_nB+_nF+1; ++j) {
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assert(_hist_sample_index+j < 2*(_nB+_nF+1));
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_taps_samples[j] -= _mu*err*std::conj(_hist_samples[_hist_sample_index+j]);
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// if (std::abs(_taps_samples[j]) > tMax) {
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// tMax = std::abs(_taps_samples[j]);
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// jMax = j;
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// }
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}
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// std::cout << "taps_max: " << jMax << " " << tMax << std::endl;
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for (int j=0; j<_nW; ++j) {
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assert(_hist_symbol_index+j < 2*_nW);
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_taps_symbols[j] -= _mu*err*std::conj(_hist_symbols[_hist_symbol_index+j]) + _alpha*_taps_symbols[j];
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|
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@ -397,9 +420,49 @@ gr_complex adaptive_dfe_impl::filter() {
|
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return filter_output*std::conj(_scramble[_symbol_counter++]);
|
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}
|
||||
|
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void adaptive_dfe_impl::recenter_filter_taps() {
|
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// get max(abs(taps))
|
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ssize_t const idx_max = std::distance(_taps_samples,
|
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std::max_element(_taps_samples+_nB+1-3*_sps, _taps_samples+_nB+1+3*_sps,
|
||||
[](gr_complex a, gr_complex b) {
|
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return std::norm(a) < std::norm(b);
|
||||
}));
|
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GR_LOG_DEBUG(d_logger, str(boost::format("idx_max=%2d abs(tap_max)=%f") % idx_max % std::abs(_taps_samples[idx_max])));
|
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|
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if (idx_max-_nB-1 >= 2*_sps && _saved_samples.empty() && _ignore_filter_updates==0) {
|
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// maximum is right of the center tap
|
||||
// -> shift taps to the left left
|
||||
GR_LOG_DEBUG(d_logger, "shift left");
|
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std::copy(_taps_samples+2*_sps, _taps_samples+_nB+_nF+1, _taps_samples);
|
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std::fill_n(_taps_samples+_nB+_nF+1-2*_sps, 2*_sps, gr_complex(0));
|
||||
// and omit the next two calls to filter in order to keep the alignment between samples and taps
|
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_ignore_filter_updates = 2;
|
||||
|
||||
} else if (idx_max-_nB-1 <= -2*_sps && _saved_samples.empty() && _ignore_filter_updates==0) {
|
||||
// maximum is left of the center tap
|
||||
// -> shift taps to the right
|
||||
GR_LOG_DEBUG(d_logger, "shift right");
|
||||
std::copy_backward(_taps_samples, _taps_samples+_nB+_nF+1-2*_sps,
|
||||
_taps_samples+_nB+_nF+1);
|
||||
std::fill_n(_taps_samples, 2*_sps, gr_complex(0));
|
||||
// save the last 2*_sps samples (will be reinserted)
|
||||
_saved_samples.resize(2*_sps);
|
||||
std::reverse_copy(_hist_samples+_hist_sample_index+(_nB+_nF+1)-2*_sps,
|
||||
_hist_samples+_hist_sample_index+(_nB+_nF+1),
|
||||
_saved_samples.begin());
|
||||
// shift samples index
|
||||
_hist_sample_index += (_nB+_nF+1)-2*_sps;
|
||||
_hist_sample_index %= (_nB+_nF+1);
|
||||
// set the 1st 2*_sps unknown old samples to zero
|
||||
for (int l=_hist_sample_index; l<_hist_sample_index+2*_sps; ++l) {
|
||||
int const k = (l+_nB+_nF+1)%(2*(_nB+_nF+1));
|
||||
_hist_samples[l] = _hist_samples[k] = gr_complex(0);
|
||||
}
|
||||
}
|
||||
}
|
||||
void adaptive_dfe_impl::set_mode(std::string mode) {
|
||||
gr::thread::scoped_lock lock(d_setlock);
|
||||
std::cout << "adaptive_dfe_impl::set_mode " << mode << std::endl;
|
||||
GR_LOG_DEBUG(d_logger, "adaptive_dfe_impl::set_mode "+ mode);
|
||||
GILLock gil_lock;
|
||||
try {
|
||||
_physicalLayer.attr("set_mode")(mode);
|
||||
|
|
@ -483,14 +546,15 @@ void adaptive_dfe_impl::update_pll(float doppler) {
|
|||
_ud = delta_f;
|
||||
_df +=_b[0]*_ud + _b[1]*ud_old;
|
||||
}
|
||||
std::cout << "PLL: " << _df << " " << delta_f << std::endl;
|
||||
GR_LOG_DEBUG(d_logger, str(boost::format("PLL: df=%f delta_f=%f (rad/symb)") % _df % delta_f));
|
||||
}
|
||||
void adaptive_dfe_impl::insert_sample(gr_complex z) {
|
||||
// insert sample into the circular buffer
|
||||
_hist_samples[_hist_sample_index] = _hist_samples[_hist_sample_index+_nB+_nF+1] = z * gr_expj(-_phase);
|
||||
if (++_hist_sample_index == _nB+_nF+1)
|
||||
_hist_sample_index = 0;
|
||||
update_local_oscillator();
|
||||
if (z != gr_complex(0))
|
||||
update_local_oscillator();
|
||||
}
|
||||
void adaptive_dfe_impl:: update_local_oscillator() {
|
||||
_phase += _df;
|
||||
|
|
@ -503,7 +567,7 @@ bool adaptive_dfe_impl::get_correlation_tag(uint64_t i, uint64_t& offset, float&
|
|||
std::vector<tag_t> v;
|
||||
get_tags_in_window(v, 0, i,i+1);
|
||||
for (int j=0; j<v.size(); ++j) {
|
||||
std::cout << "tag " << v[j].key << " " << v[j].offset-nitems_read(0) << std::endl;
|
||||
std::cout << "tag " << v[j].key << " " << v[j].offset-nitems_read(0) << " " << v[j].value << std::endl;
|
||||
if (v[j].key == pmt::mp("phase_est")) {
|
||||
phase_est = pmt::to_double(v[j].value);
|
||||
std::cout << "phase_est " << v[j].offset <<" " << nitems_read(0) << " " << phase_est << std::endl;
|
||||
|
|
|
|||
|
|
@ -50,7 +50,10 @@ private:
|
|||
int _hist_sample_index;
|
||||
int _hist_symbol_index;
|
||||
|
||||
std::size_t _sample_counter;
|
||||
int _ignore_filter_updates;
|
||||
std::vector<gr_complex> _saved_samples;
|
||||
|
||||
uint64_t _sample_counter;
|
||||
|
||||
std::vector<gr::digital::constellation_sptr> _constellations;
|
||||
std::vector<float> _npwr;
|
||||
|
|
@ -88,6 +91,7 @@ private:
|
|||
|
||||
void update_local_oscillator();
|
||||
gr_complex filter();
|
||||
void recenter_filter_taps();
|
||||
|
||||
void insert_sample(gr_complex z);
|
||||
void update_pll(float doppler);
|
||||
|
|
|
|||
|
|
@ -68,12 +68,14 @@ class PhysicalLayer(object):
|
|||
if len(symbols) != 0:
|
||||
idx = range(30,80) if self._is_first_frame else range(80)
|
||||
z = symbols[idx]*np.conj(self._preamble['symb'][idx])
|
||||
print('quality_preamble',np.sum(np.real(z)<0))
|
||||
success = np.sum(np.real(z)<0) < 30
|
||||
return success,doppler
|
||||
|
||||
def quality_data(self, s):
|
||||
"""quality check for the data frame"""
|
||||
known_symbols = np.mod(range(176),48)>=32
|
||||
print('quality_data',np.sum(np.real(s[known_symbols])<0))
|
||||
success = np.sum(np.real(s[known_symbols])<0) < 20
|
||||
return success,0 ## no doppler estimate for data frames
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue