[Discuss-gnuradio] OFDM mod-demod
hi I was doing OFDM modulation demodulation in following way file source --- OFDM Mod --- Virtual Source Virtual Sink --- OFDM demod --- File sink File source out is given in byte format. This system give output for bpsk, qpsk and 8psk modulation. and no output for QAM schemes. What changes are to be made to do QAM modulations also. Regards Sreena___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] audio sink issue
Hi I am trying to implement the following acoustic communication transmitter with PC File Source -- Packet encoder -- gmsk mod -- Rational resampler -- Frequency Xlating FIR filter -- comp to real -- audio sink Pc has inbuilt sound card. packet encoder is taking 8 samples per symbol, Resampler interpolates samples by 500, FIR filter is set at 19k carrier frequency and 1K bandwidth. The problem is that I wont get any sort of output at the audio sink. I added an GUI FFT sink at the end of FIR filter, it also showed now output. Please tell what's gone wrong. I am using gnuradio 3.7.4 version. Thanks in advance ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] OFDM transmitter receiver
Hi I used the ofdm transmitter receiver blocks to create a simple system as shown in the attachment. I used the system parameters as those used in the example transmitter and receiver grcs. Now I get error that 'Detected a packet larger than max frame size (80 symbols)'. I would like to know how the max frame size is set and should I add more information to the grc. My transmitter- receiver parameters fft length= 64 cyclic prefix = 16 packet length = 96 no. of occupied carriers = 48 no. of pilot carriers = 4 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] OFDM transmitter receiver
kernel.shmmax gave value 2147483648. Sreena___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Cmake error
Thanks for the comment. I updated my GNURadio to 3.7.4 and new module installation went well. Thanks once again. Sreena___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] cmake error
Hi I tried to implement python OOT module as given in the new tutorial. Everything was fine till I reached the installation step. cmake command made the following error.. -- Build type not specified: defaulting to release. -- Boost version: 1.49.0 -- Found the following Boost libraries: -- filesystem -- system You have called ADD_LIBRARY for library gnuradio-qpsk_demod without any source files. This typically indicates a problem with your CMakeLists.txt file -- Configuring done CMake Error: CMake can not determine linker language for target:gnuradio-qpsk_demod Going through mailing list I found that this can be overcome by removing the lib subdirectory from the CMakeLists.txt file. I removed that file and run cmake .. It ran fine. Then make command was given,.. the following was the result Scanning dependencies of target _qpsk_demod_swig_swig_tag [ 6%] Building CXX object swig/CMakeFiles/_qpsk_demod_swig_swig_tag.dir/_qpsk_demod_swig_swig_tag.cpp.o Linking CXX executable _qpsk_demod_swig_swig_tag [ 6%] Built target _qpsk_demod_swig_swig_tag Scanning dependencies of target _qpsk_demod_swig_doc_tag [ 13%] Building CXX object swig/CMakeFiles/_qpsk_demod_swig_doc_tag.dir/_qpsk_demod_swig_doc_tag.cpp.o Linking CXX executable _qpsk_demod_swig_doc_tag [ 13%] Built target _qpsk_demod_swig_doc_tag [ 20%] Generating doxygen xml for qpsk_demod_swig_doc docs warning: Tag `SHOW_DIRECTORIES' at line 477 of file /home/ttl/Documents/augest/gr-qpsk_demod/build/swig/qpsk_demod_swig_doc_swig_docs/Doxyfile has become obsolete. To avoid this warning please remove this line from your configuration file or upgrade it using doxygen -u warning: Tag `HTML_ALIGN_MEMBERS' at line 803 of file /home/ttl/Documents/augest/gr-qpsk_demod/build/swig/qpsk_demod_swig_doc_swig_docs/Doxyfile has become obsolete. To avoid this warning please remove this line from your configuration file or upgrade it using doxygen -u warning: Tag `USE_INLINE_TREES' at line 956 of file /home/ttl/Documents/augest/gr-qpsk_demod/build/swig/qpsk_demod_swig_doc_swig_docs/Doxyfile has become obsolete. To avoid this warning please remove this line from your configuration file or upgrade it using doxygen -u [ 26%] Generating qpsk_demod_swig_doc.i [ 33%] Generating qpsk_demod_swig.tag [ 40%] Swig source Scanning dependencies of target _qpsk_demod_swig [ 46%] Building CXX object swig/CMakeFiles/_qpsk_demod_swig.dir/qpsk_demod_swigPYTHON_wrap.cxx.o Linking CXX shared module _qpsk_demod_swig.so /usr/bin/ld: cannot find -lgnuradio-qpsk_demod collect2: error: ld returned 1 exit status make[2]: *** [swig/_qpsk_demod_swig.so] Error 1 make[1]: *** [swig/CMakeFiles/_qpsk_demod_swig.dir/all] Error 2 make: *** [all] Error 2 How to get out of this. Thanks in advance Sreena ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] buffer size
Hi I ran OFDM transmitter in the grc example using 1024 point fft. following error was raised after running the grc. Please help to get out of this error.. thread[thread-per-block[7]: block tagged_stream_mux (47)]: Buffer too small for min_noutput_items Thanks in advance Regards Sreena___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] audio out put
Hi I am modulating a .wav audio file and transmitting using ofdm example using gnuradio. What should I dou to receive it as an audio file using the receive example. If i write the receiver output to a wav file, it don't give the required audio. Please help regards Sreena___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] PSK modulator output
Hi What kind of sink can be used to analyse the outpt of a PSK modulator. I am transmitting a text file and is trying to retrieve and analyse using file sink.___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Creating OOT module
Hi I have written a block in python and was trying to create an out of tree module as given in the gnuradio tutorial. While using cmake ../ the following error occured. CMake Error: CMake can not determine linker language for target:gnuradio-dec CMake Error: Cannot determine link language for target gnuradio-dec. this was rectified by removing the lib directory and the cmake file was created without error. Then i run the make install and found following error: Scanning dependencies of target _dec_swig [ 46%] Building CXX object swig/CMakeFiles/_dec_swig.dir/dec_swigPYTHON_wrap.cxx.o Linking CXX shared module _dec_swig.so /usr/bin/ld: cannot find -lgnuradio-dec collect2: error: ld returned 1 exit status make[2]: *** [swig/_dec_swig.so] Error 1 make[1]: *** [swig/CMakeFiles/_dec_swig.dir/all] Error 2 make: *** [all] Error 2 what should i do to rectify this linking error.. Regards ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] testing block written in block
Hi I'm new to GNU radio and is trying to develop my own block. I want to develop a block that intake a vector and out put sum of the vector elements. I used the out of tree module and followed tutorial using python code. How should be the arguments of blocks.vector_source_f to be given if i am inputting vector stream of four integers is used. the python code and test file is given below. Code: def __init__(self, in_arg): gr.sync_block.__init__(self, name=sream_ff, in_sig=[(numpy.float32, 4)], out_sig=[numpy.float32]) def work(self, input_items, output_items): in0 = input_items[0] out = output_items[0] # +signal processing here+ out[:] = sum(in0)*in_arg return len(output_items[0]) Test code: def test_001_t (self): src_data = (([1,1,1,1],4), ([1,2,3,4],4)) expected_result = (8, 20) src = blocks.vector_source_f(src_data) fxn = sream_ff(2) snk = blocks.vector_sink_f() # set up fg self.tb.connect(src, fxn) self.tb.connect(fxn, snk) self.tb.run () # check data result_data = snk.data () self.assertFloatTuplesAlmostEqual (expected_result, result_data, 6)___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] CMake error
Hi I got the following error while doing the building out-of-tree module example given in http://gnuradio.org/redmine/projects/gnuradio/wiki/NewTutorials3. ttl@ttl-HP-Z220-CMT-Workstation:~/Documents/sreena/gr-tutorial/build$ cmake ../ -- Build type not specified: defaulting to release. -- Boost version: 1.49.0 -- Found the following Boost libraries: -- filesystem -- system -- Configuring done -- Generating done -- Build files have been written to: /home/ttl/Documents/sreena/gr-tutorial/build ttl@ttl-HP-Z220-CMT-Workstation:~/Documents/sreena/gr-tutorial/build$ make [ 6%] Built target _tutorial_swig_doc_tag [ 13%] Built target _tutorial_swig_swig_tag Linking CXX shared module _tutorial_swig.so /usr/bin/ld: cannot find -lgnuradio-tutorial collect2: error: ld returned 1 exit status make[2]: *** [swig/_tutorial_swig.so] Error 1 make[1]: *** [swig/CMakeFiles/_tutorial_swig.dir/all] Error 2 make: *** [all] Error 2 ttl@ttl-HP-Z220-CMT-Workstation:~/Documents/sreena/gr-tutorial/build$ It seems some swig error has been reported.. Please help.. Regards Sreena___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
