[Discuss-gnuradio] OFDM Training Sequence
Hey, I do my Bachelor Thesis on OFDM using GnuRadio. I am using the joint system created from tx_ofdm and rx_ofdm examples. In simulation I try to use a bigger fft. So far I have managed to send and receive for fft_len=128 and fft_len=256, BPSK modulation. I ask to help me understand the creation of sync_words for bigger fft. I see the influence of the training sequences which I use on the quality of transmission. Of course I have read that the synchronization is based on "PN Sequence Correlation" and "Maximal Likelihood" papers. I suppose that sync_word1 and sync_word2 are based on those algorithms respectively. However I don't see "two identical parts of PN sequence" like it was described in the Schmidl paper. I tried to use the sequences containing 0's where needed, and random -1's and 1's elsewhere, but then the timing synchronization error (missing trigger signal in sync_sc) occurs more often, than when I use the replicas of original sync_words from the OFDM example. I attach the file with the training sequences which I have used. Regards, Mateusz Loch --sync word1 64-- (from tx_ofdm example), 6x0., 13x(0.,scaled_rand), 6x0. [0., 0., 0., 0., 0., 0., 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 0., 0., 0., 0., 0.] --sync word2-- (from tx_ofdm example), 64 6x0, 26x(rand+0j), 1x0, 26xrand, 5x0 [0j, 0j, 0j, 0j, 0j, 0j, (-1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1 +0j), (1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), 0j, (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), (1+0j), (-1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), 0j, 0j, 0j, 0j, 0j] --sync word1 128-- recreated from sync64, 12x0, 26x(0.+scaled_rand), 12x0 [0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.] --sync word2 128-- recreated from sync64, 12x0, 52x(rand+0j), 1x0, 52xrand, 11x0 [0j, 0j, 0j, 0j, 0j, 0j, 0j, 0j, 0j, 0j, 0j, 0j, (-1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (-1+0j), (1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1 +0j), (1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (1+0j), (1 +0j), (1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), 0j, (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), (1+0j), (-1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (1+0j), (-1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), 0j, 0j, 0j, 0j, 0j, 0j, 0j, 0j, 0j, 0j, 0j] --sync word1 256-- recreated from sync64, 24x0, 52x(0., scaled_rand), 24x0 [0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -
[Discuss-gnuradio] OFDM with noise - lost packets
Hello, I have been evaluating the OFDM examples (at the beginning of my Bachelor Thesis) In ofdm_rx I have added noise source and file sinks to plot BER(SNR) in matlab. I added a Tag Debug on the output. The result is disappointing, I observe plenty of lost packets already at the SNR of about 13dB and below (noise amplitude about 1.5 in an unmodified ofdm_rx). So are those examples useful, with such a performance, to utilize with USRP and antennas? Which part of a synchronization process fails, that causes missing indexes of data packets (observed in a Tag Debug) in a noisy channel)? I think it's at the loop of 'header recognition', so it's the 'coarse frequency offset' that is too big for 'channel estimator'. I mainly want to know if it's only possible to use ofdm_rx with a low noise, with SNR over about 13 dB. Mateusz Loch ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] ImportError: No module named gnuradio
On Tuesday 05 of April 2011 09:06:10 Sim IJskes wrote: On 05-04-11 00:42, Mateusz Jasiński wrote: On Monday 04 of April 2011 15:48:26 Mateusz Jasiński wrote: On Monday 04 of April 2011 09:55:25 Martin Braun wrote: On Sat, Apr 02, 2011 at 09:19:00PM +0200, Mateusz Jasiński wrote: Hi, I'm trying to build debian packages of gnuradio git snapshot (01.04.2011). The build process is successful but I've encountered Now I'll try to somehow push those upstream packages into debian, since the 3.2.2 is much outdated. Did you coordinate with the debian gnuradio maintainer? I'm currently working on the 3.3.1 version of debian gnuradio started by the original maintainer. Please let us know how things go. If you run into troubles with debian (not) accepting your packaging, we could coordinate in order to get the package accepted via the original maintainer. Gr. Sim Yes, I've done this already. Sent him the debian dir. I;ve also packaged libuhd needed by upstream. I've received confirmation mail saying: Thanks. I'm traveling this week, but I should have time to review your work in a few days. Bdale I've tried to bulid external signal processing blocks and had to add the *.i files to the libgnuradio-core-dev package. I'll sent the updated version to the mainteiner. -- Mateusz Jasiński ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] ImportError: No module named gnuradio
On Monday 04 of April 2011 09:55:25 Martin Braun wrote: On Sat, Apr 02, 2011 at 09:19:00PM +0200, Mateusz Jasiński wrote: Hi, I'm trying to build debian packages of gnuradio git snapshot (01.04.2011). The build process is successful but I've encountered python related problem after installing the packages - gnuradio python module is missing, so none of the examples nor gnuradio-companion doesn't work. The error is: ImportError: No module named gnuradio I've checked the PYTHONPATH variable, and set it to: [matt@debian ~]$ echo $PYTHONPATH /usr/lib/python2.6/dist-packages:/usr/lib/python2.6:/usr/lib/python2.6/pl at- linux2:/usr/lib/python2.6/lib-tk:/usr/lib/python2.6/lib- old:/usr/lib/python2.6/lib-dynload:/usr/local/lib/python2.6/dist- packages:/usr/lib/pymodules/python2.6/gtk-2.0:/usr/lib/python2.6/dist- packages/gtk-2.0:/usr/lib/pymodules/python2.6 Main gnuradio related file locations are listed in the attached installed_files.log Hi Mateusz, how did you install? If you locally compiled a git snapshot, the stuff *should* end up in /usr/local/lib/python2.6/dist-packages. Other things you should check: is /usr/lib/python2.6/dist-packages/gnuradio world-readable? I've lost a lot of nerves to the fact that one machine I was testing stuff on had a screwed-up 'umask' setting and I had ended up installing everything readable only for root. MB Hi Martin, I've installed by the packages that I've built. The standard configure -- prefix=/usr There is a slight probability that some files are missing after the installation. Could you please refer to my installed_files.log attached to this message and try to check if all required by gnuradio-companion modules are installed properly? Oh, and running gnuradio-companion as root fails as for normal user. -- Mateusz Jasiński /. /etc /etc/gnuradio /etc/gnuradio/conf.d /etc/gnuradio/conf.d/gnuradio-core.conf /usr /usr/lib /usr/lib/libgnuradio-core.la /usr/lib/libgnuradio-core-3.4.0git.so.0.0.0 /usr/share /usr/share/doc /usr/share/doc/libgnuradio-core0 /usr/share/doc/libgnuradio-core0/changelog.Debian.gz /usr/share/doc/libgnuradio-core0/changelog.gz /usr/share/doc/libgnuradio-core0/copyright /usr/lib/libgnuradio-core-3.4.0git.so.0 /. /usr /usr/lib /usr/lib/python2.6 /usr/lib/python2.6/dist-packages /usr/lib/python2.6/dist-packages/gnuradio /usr/lib/python2.6/dist-packages/gnuradio/blks2 /usr/lib/python2.6/dist-packages/gnuradio/blks2/__init__.py /usr/lib/python2.6/dist-packages/gnuradio/ofdm_packet_utils.py /usr/lib/python2.6/dist-packages/gnuradio/gr_unittest.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/hexint.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/sdr_1000.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/os_read_exactly.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/msgq_runner.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/gnuplot_freqz.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/crc.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/__init__.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/daemon.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/mathmisc.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/lmx2306.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/seq_with_cursor.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/listmisc.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/socket_stuff.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/freqz.py /usr/lib/python2.6/dist-packages/gnuradio/gr /usr/lib/python2.6/dist-packages/gnuradio/gr/gr_threading.py /usr/lib/python2.6/dist-packages/gnuradio/gr/gr_threading_24.py /usr/lib/python2.6/dist-packages/gnuradio/gr/pubsub.py /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_filter.so /usr/lib/python2.6/dist-packages/gnuradio/gr/gr_threading_23.py /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_filter.py /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_io.py /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_general.py /usr/lib/python2.6/dist-packages/gnuradio/gr/prefs.py /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_gengen.py /usr/lib/python2.6/dist-packages/gnuradio/gr/__init__.py /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_hier.so /usr/lib/python2.6/dist-packages/gnuradio/gr/exceptions.py /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_general.so /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_io.so /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core.py /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_runtime.so /usr/lib/python2.6/dist-packages/gnuradio/gr/hier_block2.py /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_gengen.so /usr/lib/python2.6/dist-packages/gnuradio/gr/top_block.py /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_runtime.py /usr/lib/python2.6/dist-packages/gnuradio/gr
Re: [Discuss-gnuradio] ImportError: No module named gnuradio
On Monday 04 of April 2011 15:48:26 Mateusz Jasiński wrote: On Monday 04 of April 2011 09:55:25 Martin Braun wrote: On Sat, Apr 02, 2011 at 09:19:00PM +0200, Mateusz Jasiński wrote: Hi, I'm trying to build debian packages of gnuradio git snapshot (01.04.2011). The build process is successful but I've encountered python related problem after installing the packages - gnuradio python module is missing, so none of the examples nor gnuradio-companion doesn't work. The error is: ImportError: No module named gnuradio I've checked the PYTHONPATH variable, and set it to: [matt@debian ~]$ echo $PYTHONPATH /usr/lib/python2.6/dist-packages:/usr/lib/python2.6:/usr/lib/python2.6/ pl at- linux2:/usr/lib/python2.6/lib-tk:/usr/lib/python2.6/lib- old:/usr/lib/python2.6/lib-dynload:/usr/local/lib/python2.6/dist- packages:/usr/lib/pymodules/python2.6/gtk-2.0:/usr/lib/python2.6/dist- packages/gtk-2.0:/usr/lib/pymodules/python2.6 Main gnuradio related file locations are listed in the attached installed_files.log Hi Mateusz, how did you install? If you locally compiled a git snapshot, the stuff *should* end up in /usr/local/lib/python2.6/dist-packages. Other things you should check: is /usr/lib/python2.6/dist-packages/gnuradio world-readable? I've lost a lot of nerves to the fact that one machine I was testing stuff on had a screwed-up 'umask' setting and I had ended up installing everything readable only for root. MB Hi Martin, I've installed by the packages that I've built. The standard configure -- prefix=/usr There is a slight probability that some files are missing after the installation. Could you please refer to my installed_files.log attached to this message and try to check if all required by gnuradio-companion modules are installed properly? Oh, and running gnuradio-companion as root fails as for normal user. Managed to fiure it out. It was a file missing related problem ;] - /usr/lib/python2.6/dist- packages/gnuradio/__init__.py . Now I'll try to somehow push those upstream packages into debian, since the 3.2.2 is much outdated. -- Mateusz Jasiński ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] ImportError: No module named gnuradio
Hi, I'm trying to build debian packages of gnuradio git snapshot (01.04.2011). The build process is successful but I've encountered python related problem after installing the packages - gnuradio python module is missing, so none of the examples nor gnuradio-companion doesn't work. The error is: ImportError: No module named gnuradio I've checked the PYTHONPATH variable, and set it to: [matt@debian ~]$ echo $PYTHONPATH /usr/lib/python2.6/dist-packages:/usr/lib/python2.6:/usr/lib/python2.6/plat- linux2:/usr/lib/python2.6/lib-tk:/usr/lib/python2.6/lib- old:/usr/lib/python2.6/lib-dynload:/usr/local/lib/python2.6/dist- packages:/usr/lib/pymodules/python2.6/gtk-2.0:/usr/lib/python2.6/dist- packages/gtk-2.0:/usr/lib/pymodules/python2.6 Main gnuradio related file locations are listed in the attached installed_files.log Any help? Regards, -- Mateusz Jasiński libgnuradio-core: --- /etc /etc/gnuradio /etc/gnuradio/conf.d /etc/gnuradio/conf.d/gnuradio-core.conf /usr /usr/lib /usr/lib/libgnuradio-core.la /usr/lib/libgnuradio-core-3.4.0git.so.0.0.0 /usr/share /usr/share/doc /usr/share/doc/libgnuradio-core0 /usr/share/doc/libgnuradio-core0/changelog.Debian.gz /usr/share/doc/libgnuradio-core0/changelog.gz /usr/share/doc/libgnuradio-core0/copyright /usr/lib/libgnuradio-core-3.4.0git.so.0 python-gnuradio-core: --- /usr /usr/lib /usr/lib/python2.6 /usr/lib/python2.6/dist-packages /usr/lib/python2.6/dist-packages/gnuradio /usr/lib/python2.6/dist-packages/gnuradio/blks2 /usr/lib/python2.6/dist-packages/gnuradio/blks2/__init__.py /usr/lib/python2.6/dist-packages/gnuradio/ofdm_packet_utils.py /usr/lib/python2.6/dist-packages/gnuradio/gr_unittest.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/hexint.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/sdr_1000.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/os_read_exactly.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/msgq_runner.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/gnuplot_freqz.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/crc.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/__init__.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/daemon.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/mathmisc.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/lmx2306.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/seq_with_cursor.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/listmisc.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/socket_stuff.py /usr/lib/python2.6/dist-packages/gnuradio/gruimpl/freqz.py /usr/lib/python2.6/dist-packages/gnuradio/gr /usr/lib/python2.6/dist-packages/gnuradio/gr/gr_threading.py /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_runtime.la /usr/lib/python2.6/dist-packages/gnuradio/gr/gr_threading_24.py /usr/lib/python2.6/dist-packages/gnuradio/gr/pubsub.py /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_filter.so /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_io.la /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_filter.la /usr/lib/python2.6/dist-packages/gnuradio/gr/gr_threading_23.py /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_filter.py /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_io.py /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_general.py /usr/lib/python2.6/dist-packages/gnuradio/gr/prefs.py /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_gengen.py /usr/lib/python2.6/dist-packages/gnuradio/gr/__init__.py /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_hier.so /usr/lib/python2.6/dist-packages/gnuradio/gr/exceptions.py /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_general.so /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_io.so /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core.py /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_runtime.so /usr/lib/python2.6/dist-packages/gnuradio/gr/hier_block2.py /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_gengen.so /usr/lib/python2.6/dist-packages/gnuradio/gr/top_block.py /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_runtime.py /usr/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_hier.py /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_hier.la /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_general.la /usr/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_gengen.la /usr/lib/python2.6/dist-packages/gnuradio/modulation_utils2.py /usr/lib/python2.6/dist-packages/gnuradio/usrp_options.py /usr/lib/python2.6/dist-packages/gnuradio/modulation_utils.py /usr/lib/python2.6/dist-packages/gnuradio/vocoder /usr/lib/python2.6/dist-packages/gnuradio/vocoder/__init__.py /usr/lib/python2.6/dist-packages/gnuradio/gru /usr/lib/python2.6/dist-packages/gnuradio/gru/__init__.py /usr/lib
