Yes, that's true, but actually I am using USRP/WBX and GNURADIO, everything works, but I think I can make it better if I redesign it in the spirit of SDR.
I want to receive both fsk and on-off, and at the moment I have two parallel processing paths. On Fri, Dec 6, 2013 at 12:54 PM, Marcus Müller <[email protected]> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Ah ok, I think I can make out some misunderstandings: > * You use an USRP / WBX System > * You want to use GNU Radio to decode a signal > - transmitted at 434 MHz > - having a symbol rate of 19.2 kHz > - being binary coded > - that binary coding being on-off keying > > Is that correct? > > On 06.12.2013 12:49, Nemanja Savic wrote: > > Ok, i should put more info. I have USRP and WBX., and I designed > > receiver for operating withing 434 MHz. Since I am more hardware > > oriented electrical engineer, I didn't know how to make it in > > "correct" way, and there are a few blocks there that are based on > > simulating hardware that I know how functionate. So, I use sampling > > frequency of 500k, and after demodulator, I have a block that works > > literally as diode min max circuit and is usually implemented in > > some receivers. That block, extracts threshold (which is half way > > between min and max). After that, the same input is compared to > > threshold signal in order to derive signal that has only zero level > > and one level (so digital signal). Derived "digital" signal is sent > > to something that I call clock syncronizer, and there I search for > > the edges in order to allign my sampling period, and I do sampling > > in order to get symbol values. So my question is what would be the > > correct way to design this, because I think that my approach is > > definately not correct one and in my opinion too robust. > > > > > > On Fri, Dec 6, 2013 at 12:22 PM, Marcus Müller <[email protected]> > > wrote: > > > > Hi Nemanja, > > > > uff, that's quite a lot of text I hardly understand. Could you > > please confirm: > > > > * You want to design a receiver * the receiver should have an > > Analog-to-digital converter * You already have a design for mixing > > from RF to baseband > > > > The rest I don't understand. What is your question? How is it > > related to GNU Radio? But it really does sound exciting! > > > > Greetings, Marcus > > > > On 06.12.2013 11:26, Nemanja Savic wrote: > >>>> Hi all guys, > >>>> > >>>> this time :), my question is regarding soem reference book or > >>>> any other kind of literature, where I can find about how > >>>> digital receiver should be designed regarding sps. Namely, my > >>>> current receiver is more or less simulation of some analog > >>>> circuitry that I understand better than DSP. For example, > >>>> after demodulation I use a block that is apprximation of > >>>> diode min max circuit for setting the right threshold for > >>>> getting dgital signal out of "analog" demodulator output. > >>>> After that my bit slicer works more or less like the one > >>>> found in the UART. For this reasons, the signal needs to be > >>>> highly oversampled, for example, symbol rate is 19.2kb and I > >>>> use sampling frequency of 500ksps. When lowering sampling > >>>> frequency to 250ksps, the performance of the receiver > >>>> degrades a lot, plus probably to many processing effort than > >>>> it should be. > >>>> > >>>> Thanx, > >>>> > >>>> > >>>> > >>>> _______________________________________________ > >>>> Discuss-gnuradio mailing list [email protected] > >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >>>> > >> > >> _______________________________________________ Discuss-gnuradio > >> mailing list [email protected] > >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >> > > > > > > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.15 (GNU/Linux) > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQEcBAEBAgAGBQJSobsEAAoJEAFxB7BbsDrLUxMH/3qZqxND7Q0TYtAh6Ztc5pg8 > ns+D3C3swusKoGAdR+ajXrRjSX2rr0fHcEmGP9dmW+WUc0FohY/abHMpSO28IZld > Xrj9saBxv00IlG27HJqmZcLJQCnm4k80cZoKwkiLE0Z6XGFfVRhNFdvU4lbLk6Rs > nWEgi7aKozY1L6kJgJjTtx48o6R2SJWWkolPP5eZemblcvrOnSb60DN+lRkWFfmA > ZNW8n7ph0pqblAaWEGg8umfnj7TEGGjyjy0JBZGDRclpaHBMNAngQ3W3tOxeAD3t > EhaqLwLAPvXh1QTs10K91DFdrYiIDQZNsXl6LgSo5skJa2R0LD1yHrrGgC4flcg= > =O5vA > -----END PGP SIGNATURE----- > -- Nemanja Savić
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