[Discuss-gnuradio] OOT Module Not Working Properly
Hello Guys I'm creating a customized block in the GNU Radio framework using python that takes in a number of input items and once that number of input items surpasses a certain number, 1024 of the input items are taken and stored into an array, and then those items are converted to dB and lastly compared to a threshold value, 5 in this case. If any of the values are greater than the threshold value, a message is printed indicating a signal is present, and if none of the values are greater than 5, this is indicated with a message stating "No signal is present". In the flow graph attached, I'm using a cosine source and a gaussian noise source to test my block in two different scenarios. In scenario 1, I run the flow graph with both signal sources and I expect to receive a message stating "A signal is present" because the power of the signal will be greater than the threshold. In scenario 2, the cosine source is disabled and only the noise source is runing. In this scenario I expect to get a message indicating no signal is present because the calculated power will be lower than the threshold. Scenario 1 works, however, scenario 2 doesn't work no matter how high I raise the threshold value and, at this point, I'm not quite sure as to why. Any help would be appreciated. Both the .py script for the oot block and the .grc file are included. Tellrell Ener_detec.py Description: Binary data ener_dtec.grc Description: Binary data ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] OFDM channel tap questions
I have to agree with you, and I don't understand what's going on. It
looks like the magnitude of the taps should be 1.0, even if there's a
phase offset.
On 01/11/2018 03:53 PM, edwin wrote:
Hi Jeff,
Thanks for the reply. What you said about the noise makes sense.
However, even if I turn the noise off, I still get the weired taps:
Offset: 2112 Source: n/a Key: ofdm_sync_chan_taps Value: #[(0,0)
(0,0) (0,0) (0,0) (0,0) (0,0) (35.5567,-53.2143) (-6.27313,-63.6921)
(-45.255,-45.255) (-63.6921,-6.27313) (-53.2143,35.5567)
(-18.5783,61.2445) (24.4919,59.1286) (56.4432,30.1695)
(62.7706,-12.4858) (40.6014,-49.4729) (2.45706e-06,-64.0003)
(-40.6014,-49.4729) (-62.7706,-12.4858) (-56.4432,30.1695)
(-24.4919,59.1286) (18.5783,61.2445) (53.2143,35.5567)
(6.36922,-0.627315) (4.52551,-4.52551) (6.27312,-63.6921)
(-3.55567,-5.32143) (-6.12445,-1.85783) (-5.91286,2.44919)
(-3.01695,5.64432) (1.24858,6.27706) (4.94729,4.06014) (0,0)
(4.94729,-4.06014) (1.24858,-6.27706) (-3.01696,-5.64433)
(-5.91286,-2.44919) (-6.12445,1.85783) (-3.55567,5.32144)
(6.27312,63.6921) (4.52551,4.52551) (6.36922,0.627312)
(5.32143,-3.55567) (1.85783,-6.12445) (-2.44919,-5.91286)
(-5.64433,-3.01696) (-6.27706,1.24858) (-4.06014,4.94729)
(-1.9985e-06,6.40003) (4.06014,4.94729) (6.27706,1.24858)
(5.64432,-3.01696) (2.44918,-5.91286) (-18.5783,-61.2445)
(-5.32143,-3.55567) (-6.36922,0.62731) (-4.52551,4.52551)
(-0.627314,6.36921) (3.55567,5.32143) (0,0) (0,0) (0,0) (0,0) (0,0)]
The piece of code you posted:
for (int i = loop_start; i < loop_end; i++) {
if ((d_ref_sym[i-carr_offset] != gr_complex(0, 0))) {
taps[i-carr_offset] = sym[i] / d_ref_sym[i-carr_offset];
}
}
I believe it comes from the ofdm_chanest_vcvc_impl.cc, doesn't it?
According to my understanding, it is calculating the channel taps by
dividing the received symbol with the sync symbols, which are known. If
the channel is perfect and there is no noise, the received symbols
should be exactly the same as the sync symbols. The channel taps should
be 1.
Regards,
Edwin
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Re: [Discuss-gnuradio] cannot install gr-burst and gr-eventstream on raspberry pi 3
On 01/11/2018 03:15 AM, ogün levent wrote: > Hi everyone > I cannot install gr-burst and gr-eventstream to raspberry pi rasbian os > via cmake. I get these messages during installation In the README for gr-burst, it indicates you need to install gr-mapper. Also the included error messages are for gr-burst - do you have a different set of error messages for gr-eventstream? -- Cinaed > > Best > > [ 7%] Building CXX object > lib/CMakeFiles/gnuradio-burst.dir/synchronizer_v4_impl.cc.o > [ 7%] Building CXX object lib/CMakeFiles/gnuradio-burst.dir/qa_helpers.cc.o > [ 7%] Linking CXX shared library libgnuradio-burst.so > [ 7%] Built target gnuradio-burst > Scanning dependencies of target test-burst > [ 7%] Building CXX object lib/CMakeFiles/test-burst.dir/test_burst.cc.o > [ 7%] Building CXX object > lib/CMakeFiles/test-burst.dir/qa_synchronizer_v4.cc.o > [ 7%] Building CXX object lib/CMakeFiles/test-burst.dir/qa_burst.cc.o > [ 7%] Building CXX object lib/CMakeFiles/test-burst.dir/qa_helpers.cc.o > [ 7%] Linking CXX executable test-burst > [ 7%] Built target test-burst > Scanning dependencies of target burst_swig_swig_doc > [ 7%] Built target burst_swig_swig_doc > Scanning dependencies of target _burst_swig_swig_tag > [ 7%] Building CXX object > swig/CMakeFiles/_burst_swig_swig_tag.dir/_burst_swig_swig_tag.cpp.o > [ 7%] Linking CXX executable _burst_swig_swig_tag > [ 7%] Built target _burst_swig_swig_tag > [ 7%] Generating burst_swig.tag > Scanning dependencies of target burst_swig_swig_2d0df > [ 7%] Building CXX object > swig/CMakeFiles/burst_swig_swig_2d0df.dir/burst_swig_swig_2d0df.cpp.o > [ 7%] Linking CXX executable burst_swig_swig_2d0df > Swig source > /home/pi/gr-burst/swig/burst_swig.i:6: Error: Unable to find > 'mapper/mapper/swig/mapper_swig.i' > swig/CMakeFiles/burst_swig_swig_2d0df.dir/build.make:134: recipe for > target 'swig/burst_swig_swig_2d0df' failed > make[2]: *** [swig/burst_swig_swig_2d0df] Error 1 > make[2]: *** Deleting file 'swig/burst_swig_swig_2d0df' > CMakeFiles/Makefile2:274: recipe for target > 'swig/CMakeFiles/burst_swig_swig_2d0df.dir/all' failed > make[1]: *** [swig/CMakeFiles/burst_swig_swig_2d0df.dir/all] Error 2 > Makefile:138: recipe for target 'all' failed > make: *** [all] Error 2 > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] OFDM channel tap questions
Hi Jeff,
Thanks for the reply. What you said about the noise makes sense.
However, even if I turn the noise off, I still get the weired taps:
Offset: 2112 Source: n/a Key: ofdm_sync_chan_taps Value: #[(0,0)
(0,0) (0,0) (0,0) (0,0) (0,0) (35.5567,-53.2143) (-6.27313,-63.6921)
(-45.255,-45.255) (-63.6921,-6.27313) (-53.2143,35.5567)
(-18.5783,61.2445) (24.4919,59.1286) (56.4432,30.1695)
(62.7706,-12.4858) (40.6014,-49.4729) (2.45706e-06,-64.0003)
(-40.6014,-49.4729) (-62.7706,-12.4858) (-56.4432,30.1695)
(-24.4919,59.1286) (18.5783,61.2445) (53.2143,35.5567)
(6.36922,-0.627315) (4.52551,-4.52551) (6.27312,-63.6921)
(-3.55567,-5.32143) (-6.12445,-1.85783) (-5.91286,2.44919)
(-3.01695,5.64432) (1.24858,6.27706) (4.94729,4.06014) (0,0)
(4.94729,-4.06014) (1.24858,-6.27706) (-3.01696,-5.64433)
(-5.91286,-2.44919) (-6.12445,1.85783) (-3.55567,5.32144)
(6.27312,63.6921) (4.52551,4.52551) (6.36922,0.627312)
(5.32143,-3.55567) (1.85783,-6.12445) (-2.44919,-5.91286)
(-5.64433,-3.01696) (-6.27706,1.24858) (-4.06014,4.94729)
(-1.9985e-06,6.40003) (4.06014,4.94729) (6.27706,1.24858)
(5.64432,-3.01696) (2.44918,-5.91286) (-18.5783,-61.2445)
(-5.32143,-3.55567) (-6.36922,0.62731) (-4.52551,4.52551)
(-0.627314,6.36921) (3.55567,5.32143) (0,0) (0,0) (0,0) (0,0) (0,0)]
The piece of code you posted:
for (int i = loop_start; i < loop_end; i++) {
if ((d_ref_sym[i-carr_offset] != gr_complex(0, 0))) {
taps[i-carr_offset] = sym[i] / d_ref_sym[i-carr_offset];
}
}
I believe it comes from the ofdm_chanest_vcvc_impl.cc, doesn't it?
According to my understanding, it is calculating the channel taps by
dividing the received symbol with the sync symbols, which are known. If
the channel is perfect and there is no noise, the received symbols
should be exactly the same as the sync symbols. The channel taps should
be 1.
Regards,
Edwin
___
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Re: [Discuss-gnuradio] cannot install gr-burst and gr-eventstream on raspberry pi 3
Hi Ogün, this might be many things – generally, your Pi might just be running out of memory during the build, for example (in that case, you'll often find a hint about the OOM (out-of-memory) killer in `dmesg`; I suspect memory limits because SWIG is especially hungry for RAM). make VERBOSE=1 might shed more light, but not necessarily so :( I'd generally recommend cross-compiling when building software for an embedded-style device like the Pi; you wouldn't try to compile software on your car's embedded computers, either! It depends on the OS you're using on the Pi how easy that is. Best regards, Marcus On Thu, 2018-01-11 at 14:15 +0300, ogün levent wrote: > Hi everyone > I cannot install gr-burst and gr-eventstream to raspberry pi rasbian > os via cmake. I get these messages during installation > > Best > > [ 7%] Building CXX object lib/CMakeFiles/gnuradio- > burst.dir/synchronizer_v4_impl.cc.o > [ 7%] Building CXX object lib/CMakeFiles/gnuradio- > burst.dir/qa_helpers.cc.o > [ 7%] Linking CXX shared library libgnuradio-burst.so > [ 7%] Built target gnuradio-burst > Scanning dependencies of target test-burst > [ 7%] Building CXX object lib/CMakeFiles/test- > burst.dir/test_burst.cc.o > [ 7%] Building CXX object lib/CMakeFiles/test- > burst.dir/qa_synchronizer_v4.cc.o > [ 7%] Building CXX object lib/CMakeFiles/test- > burst.dir/qa_burst.cc.o > [ 7%] Building CXX object lib/CMakeFiles/test- > burst.dir/qa_helpers.cc.o > [ 7%] Linking CXX executable test-burst > [ 7%] Built target test-burst > Scanning dependencies of target burst_swig_swig_doc > [ 7%] Built target burst_swig_swig_doc > Scanning dependencies of target _burst_swig_swig_tag > [ 7%] Building CXX object > swig/CMakeFiles/_burst_swig_swig_tag.dir/_burst_swig_swig_tag.cpp.o > [ 7%] Linking CXX executable _burst_swig_swig_tag > [ 7%] Built target _burst_swig_swig_tag > [ 7%] Generating burst_swig.tag > Scanning dependencies of target burst_swig_swig_2d0df > [ 7%] Building CXX object > swig/CMakeFiles/burst_swig_swig_2d0df.dir/burst_swig_swig_2d0df.cpp.o > [ 7%] Linking CXX executable burst_swig_swig_2d0df > Swig source > /home/pi/gr-burst/swig/burst_swig.i:6: Error: Unable to find > 'mapper/mapper/swig/mapper_swig.i' > swig/CMakeFiles/burst_swig_swig_2d0df.dir/build.make:134: recipe for > target 'swig/burst_swig_swig_2d0df' failed > make[2]: *** [swig/burst_swig_swig_2d0df] Error 1 > make[2]: *** Deleting file 'swig/burst_swig_swig_2d0df' > CMakeFiles/Makefile2:274: recipe for target > 'swig/CMakeFiles/burst_swig_swig_2d0df.dir/all' failed > make[1]: *** [swig/CMakeFiles/burst_swig_swig_2d0df.dir/all] Error 2 > Makefile:138: recipe for target 'all' failed > make: *** [all] Error 2 > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] cannot install gr-burst and gr-eventstream on raspberry pi 3
Hi everyone I cannot install gr-burst and gr-eventstream to raspberry pi rasbian os via cmake. I get these messages during installation Best [ 7%] Building CXX object lib/CMakeFiles/gnuradio-burst. dir/synchronizer_v4_impl.cc.o [ 7%] Building CXX object lib/CMakeFiles/gnuradio-burst.dir/qa_helpers.cc.o [ 7%] Linking CXX shared library libgnuradio-burst.so [ 7%] Built target gnuradio-burst Scanning dependencies of target test-burst [ 7%] Building CXX object lib/CMakeFiles/test-burst.dir/test_burst.cc.o [ 7%] Building CXX object lib/CMakeFiles/test-burst.dir/ qa_synchronizer_v4.cc.o [ 7%] Building CXX object lib/CMakeFiles/test-burst.dir/qa_burst.cc.o [ 7%] Building CXX object lib/CMakeFiles/test-burst.dir/qa_helpers.cc.o [ 7%] Linking CXX executable test-burst [ 7%] Built target test-burst Scanning dependencies of target burst_swig_swig_doc [ 7%] Built target burst_swig_swig_doc Scanning dependencies of target _burst_swig_swig_tag [ 7%] Building CXX object swig/CMakeFiles/_burst_swig_ swig_tag.dir/_burst_swig_swig_tag.cpp.o [ 7%] Linking CXX executable _burst_swig_swig_tag [ 7%] Built target _burst_swig_swig_tag [ 7%] Generating burst_swig.tag Scanning dependencies of target burst_swig_swig_2d0df [ 7%] Building CXX object swig/CMakeFiles/burst_swig_ swig_2d0df.dir/burst_swig_swig_2d0df.cpp.o [ 7%] Linking CXX executable burst_swig_swig_2d0df Swig source /home/pi/gr-burst/swig/burst_swig.i:6: Error: Unable to find 'mapper/mapper/swig/mapper_swig.i' swig/CMakeFiles/burst_swig_swig_2d0df.dir/build.make:134: recipe for target 'swig/burst_swig_swig_2d0df' failed make[2]: *** [swig/burst_swig_swig_2d0df] Error 1 make[2]: *** Deleting file 'swig/burst_swig_swig_2d0df' CMakeFiles/Makefile2:274: recipe for target 'swig/CMakeFiles/burst_swig_swig_2d0df.dir/all' failed make[1]: *** [swig/CMakeFiles/burst_swig_swig_2d0df.dir/all] Error 2 Makefile:138: recipe for target 'all' failed make: *** [all] Error 2 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] GNURadio FFT Plot and UBX Maximum Input Power
Hi to all, I have an X310 USRP and a UBX-160 on it. There is also an antenna connected. I am transmistting some signal by a handheld radio and plotting the FFT plot of IQ data in GNURadio. It seems that power reaches almost 0dB. If I close too much the spectrum fluctuates, it does not look good. I think it saturates. When the peak at FFT Plot is -10 or -20 dB, the spectrum's shape is good. But the UBX is said to have max. input power of -15dBm which -45 dB. Do I give harm to my daughterboard in this case? I am confused. It does not look that I am harming. Best, Ali ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
