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? [image: Images intégrées 1] 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
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