Hello Mehtap, There will have some filter roll off as well, so the rule of thumb is to have a margin in your sample rates. A safe margin is that your bandwidth of interest be no more than 80% of the theoretical bandwidth of your sample rate, so your recommended rate would be 62.5 MS/s. Helpfully 61.44 MS/s is a common rate due to it being a telecom rate. That's only 1.7% off your target, not a problem. One of the USB3 based SDRs would work in that case, at least as far as sample rate goes.
Regards, Derek On Thu, Apr 26, 2018 at 10:47 AM, Jeff Long <willco...@gmail.com> wrote: > Correct, you need at least 50 MS/s complex (I+Q) which is 100 MS/s or 400 > MB/s from an I/O point of view. GNU Radio blocks can be used for real time > decoding. Depending on what kind of "decoding" you want to do, the > processor may not be able to keep up. > > > On 04/26/2018 04:05 AM, mehtap özkan wrote: > >> Dear All, >> Mine is more of a fundamental question. >> I have a 50 MHz (3 db bandwidth) wide QPSK signal. >> I am aware that Gnuradio blocks can not be used for real time decoding. >> In order to record the signal and demodulate it correctly, what should >> the minimum sampling rate be? >> If the minimum sampling rate is 100 MSPS, then I am pretty much stuck >> with USRP x310 as the only selection available.(or maybe LIMESDR-PCIe) >> I am also not sure if the source block streams 100 MSPS sampled signal >> or I+Q (50 MHz-I, 50 MHz-Q). >> Thank you in advance. >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://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 list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
