You're still not explaining what your question is – I really don't know what to answer.
What is wrong? On 07/04/2017 11:31 AM, Rafik ZITOUNI wrote: > Sorry I missed to add the flow graph. > Here is attached. > > 2017-07-04 11:29 GMT+02:00 Rafik ZITOUNI <rzito...@gmail.com > <mailto:rzito...@gmail.com>>: > > Marcus, > > You find attached my flow graph with Tx and Rx. I know that it is > not recommended to have TX and RX in the same flow graph but i did > it just to obtain one view for my Tx and Rx. > > Thanks, > > 2017-07-04 11:23 GMT+02:00 Marcus Müller <marcus.muel...@ettus.com > <mailto:marcus.muel...@ettus.com>>: > > Dear Rafik, > > I think we're approaching this from the wrong side: I don't > think that I should be explaining why you get a good BER and > SNR estimate, it is you who should explain why you're > expecting something different, and then we can discuss! I'm > not quite sure what I could be explaining at this point :) > > Best regards, > > Marcus > > > On 07/04/2017 11:20 AM, Rafik ZITOUNI wrote: >> Thank you Marcus for your answer ! >> >> My BER and SNR are calculated and obtained using MPSK SNR >> Estimator Probe and Error Rate blocks. I obtained two >> points, which rotate in the qt gui constellation sink despite >> the BER and SNR have been obtained as expected. Could you >> give me an explanation how it was possible to obtain a good >> snr and ber with a wrong constellation with good SNR and BER? >> >> I found the presentation of Tom Rondeau useful, since he >> explained the function of the costas loop >> block. >> https://static.squarespace.com/static/543ae9afe4b0c3b808d72acd/543aee1fe4b09162d08633fc/543aee1fe4b09162d0863402/1392309732018/mpsk.pdf >> >> <https://static.squarespace.com/static/543ae9afe4b0c3b808d72acd/543aee1fe4b09162d08633fc/543aee1fe4b09162d0863402/1392309732018/mpsk.pdf> >> >> >> This morning I add a Costas loop after a Polyphase Clock >> Syncronisation block, and it s going well. You find attached >> a screenshot of my constellation for a DBPSK of >> my receiver/transmitter. I propose to add a grc to >> gnuradio/gr-digital for MPSK since grc is more easy to >> understand than python source code. >> >> >> Now I am trying to send and receive data files such as videos >> or images (bmp). Do you have an example with a file >> exchange implemented in .py or grc? >> >> Best, >> >> >> 2017-07-04 9:44 GMT+02:00 Marcus Müller >> <marcus.muel...@ettus.com <mailto:marcus.muel...@ettus.com>>: >> >> Hi Rafik! >> >> So, what's wrong with the BER and the SNR estimate? >> >> Best regards, >> >> Marcus >> >> >> On 07/03/2017 11:29 PM, Rafik ZITOUNI wrote: >>> Dear all, >>> >>> I translate the >>> /gr-digital/examples/narrowband/digital_bert_tx.py and >>> the /gr-digital/examples/narrowband/digital_bert_rx.py >>> python source codes to GRC flow graphs. The objective is >>> to get more graphical possibilities with a GRC. My flow >>> graph gives a fine result of BER and SNR for DBPSK >>> modulation. >>> The problem is with the rotating points of my >>> constellation. I think that the rotation of my view >>> comes from a lack of frequency synchronization, but why >>> I obtained a correct BER and SNR? >>> >>> You find attached to this message a constellation view >>> obtained by my flow graph. >>> >>> Please could you explain me this result or give an >>> advice to improve the obtained result? >>> >>> Regards, >>> >>> >>> -- >>> **<http://www.ece.fr/>Rafik >>> >>> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> >> _______________________________________________ >> Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org >> <mailto:Discuss-gnuradio@gnu.org> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> >> >> -- >> **<http://www.ece.fr/>Rafik > > -- > **<http://www.ece.fr/>Rafik > > -- > **<http://www.ece.fr/>Rafik > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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