Hello Marcus, Thanks for the response,
I am not using an attenuator, because i font have one , i am only with my cable, but i have meassured the Power before connecting to the RX in my USRP, so it wont be bigger than the threshold of the USRP. Thanks for the info, is there any guide where i can look all of the blocks for Sync, phase tracking and shape filtering implemented in a loopback for 16QAM and other digital modulations (Flowgraphs examples)? Thanks a lot for the help. On Thu, Jun 14, 2018 at 12:00 PM, Müller, Marcus (CEL) <muel...@kit.edu> wrote: > Hi Luis, > > I hope you're using an attenuator with a cable or antennas in your > feedback, not to risk damaging your receiver! > > What you need to do to get a similar constellation is the whole dance > that is taught in your average digital communication basics lecture: > > Synchronization in time, and phase (and theoretically frequency, but > when it's really only a loopback, that's not an issue, since they will > be identical), an equalizer if your channel leads to ISI, and > potentially phase tracking, as well as usually some sort of pulse > shaping filter etc. > > Best regards, > Marcus > > On Thu, 2018-06-14 at 10:59 +0200, Luis Felipe Albarracin Sanchez > wrote: > > Hello all, > > > > I am trying to do a Loopback with an USRP B210, ad i have the following > flowgraph: > > > > > > > > > > > > For mi test i need to obtain a similar constellation once i received the > signal, but i am getting: > > > > > > > > > > My question is, are there any blocks missing or what else i need to do, > to obtain a similar constellation in the Rx side? > > > > Once again, thank you very much. > > > > Kind regards. > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- Eng. Luis Felipe Albarracin PMP CCNA/CCDA/CCNP/CCDP/CCIP ITIL v3 Foundation Msc. Telematics / MBA "Die Grenzen meiner Sprache bedeuten die Grenzen meiner Welt"
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
