When you say differential, what does it mean? To me something differential is something that has only 2 levels (like 0 and 180 degrees). If it's the case, how can you tell it ?
When you say "channel" what do you mean ? I'm sorry if it seems difficult for me because it is right now. I'm trying to sort it all out and make a clear idea of what's wrong. 2016-07-21 18:57 GMT-04:00 Marcus Müller <marcus.muel...@ettus.com>: > I've explained that multiple times already. You're doing a differential > phase shift keying, and as long as there's no channel between your > pseudo-FSK transmitter and your quadrature demod, the quadrature demod's > output will actually be the same phase difference. Please, let the 1Sample > per symbol question go for now. > > Best regards, > > Marcus > > On 22.07.2016 00:55, Olivier Goyette wrote: > > I'm aware of all this. This is why I asked because I don't understand why > with 1 sps I can recover my entire message with no trouble but when it > comes to a higher sps I can't. This afternoon I tried something with a MM > clock recovery (with 6 sps). In simulation it gave me somewhat of a good > result. I was able to recover my message but with some intermission > (receiving 0's). When it came to real world, it wasn't working anymore. > There is something unclear to me in this part. > Le 2016-07-21 18:48, "Marcus Müller" < <marcus.muel...@ettus.com> > marcus.muel...@ettus.com> a écrit : > >> any way you do this, if you're using quadrature demod, you must also not >> reduce the sample number until *after* you demodulated your FSK signal. >> >> Again, for something to actually have a frequency, you'd need it to have >> a derivable phase. Derivation needs more than one sample. >> >> Best regards, >> >> Marcus >> >> On 22.07.2016 00:42, Ed Criscuolo wrote: >> >> Your flowgraph intrinsically has one symbol per sample in the data >> generation portion. You need a resampler just ahead of the throttle to >> interpolate in order to increase the number of samples per symbol. >> >> @(^.^)@ Ed >> Sent from my iPhone >> >> On Jul 21, 2016, at 3:15 PM, Olivier Goyette < >> <olivier.goyett...@gmail.com>olivier.goyett...@gmail.com> wrote: >> >> Hi all ! >> >> I've been working on this flowgraph for a while now and I've been able to >> pinpoint what is not working, but I don't understand how to resolve this >> so, that's why i'm asking for your guidance. >> >> Take a look at the flowgraph i've joined. The thing that doesn't seem to >> be working on this setup is the samples/symbol in th CPFSK mod block. >> >> When I set this parameter to 1 i'm able to retrieve my message at the >> file sink. So it tells me that what I did is okay in *some way*. >> >> What is not working is when I set the same parameter to 6. At the >> beginning I wasn't using the rational resampler and it wasn't working. So I >> thought I would need something to "divide" the number of samples to >> retrieve each symbols. I tried it with the rational resampler block and set >> decimation to 6, but then, Daaaaaah......not working again. >> >> There is something I can't work around here because I do not have >> sufficient knowledge about this samples/symbol thing. >> >> I'd like to hear from you pals if you could give me a bit of information >> about how to make this work properly. >> >> thank you ! >> >> <CPFSK.grc.png> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing >> listDiscuss-gnuradio@gnu.orghttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > _______________________________________________ > Discuss-gnuradio mailing > listDiscuss-gnuradio@gnu.orghttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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