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From: | Rafik ZITOUNI |
Subject: | Re: [Discuss-gnuradio] BER & SNR |
Date: | Tue, 4 Jul 2017 11:49:44 +0200 |
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 <address@hidden>:
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 <address@hidden>:
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:
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?
the
my constellation of my 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 images
2017-07-04 9:44 GMT+02:00 Marcus Müller <address@hidden>:
______________________________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/narrowban d/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,
--
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