Hope you (Marcus) didn't change your mind not help me :) Actually I just wanted to ask for some literature, and the question is not directly connected to GNU radio, but rather indirectly.
Best On Fri, Dec 6, 2013 at 1:04 PM, Nemanja Savic <[email protected]> wrote: > 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 > -- Nemanja Savić
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