You're not resolving the \pi/2 ambiguities. I guess that's what's wrong here.
Cheers, M On 02/20/2016 03:33 PM, Damindra Bandara wrote: > Hi, > > I am trying to transmit and receive a file using Ettus USRP and GNU > Radio Companion. The modulation scheme used is QPSK. I followed the "gnu > radio tutorial 7:PSK Symbol recovery" . That worked fine and I was able > to recover the file at the receiver end. That tutorial uses a out of > tree module "my_qpsk_demod" as the QPSK demodulator. I am trying to > replace the "my_qpsk_demod" with "constellation decoder" block. I did > that as shown in the attached figure. After I did this modification, I > was not able to receive the file properly. > > When I observe the constellation plot after the costas loop, I can > clearly see the four constellation. I really appreciate if you could > help me to understand what I am doing wrong and get the code working. > > Thank you very much > Damindra > > -- > Damindra Savithri Bandara, > PhD in Information Technology (Candidate) > George Mason University, > Fairfax, > Virginia > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
