-----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----- _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
