The B2x0 family of USRPs can do 16, 12, and 8 bit complex samples over the USB cable. 12 bit ends up incurring CPU load to convert back into 16 bit values on the host computer, but saves on USB throughput, useful on some computers. The maximum sample rate is 61.44 MS/s using one channel. UHD can then convert the over the wire format to the host format you desire.
On Thu, Apr 26, 2018 at 3:20 PM, Martin K <martin.klingensm...@gmail.com> wrote: > Unless I'm mistaken the B210 can do 8 bit sample depth, giving you 1 Gbps > data rate at 62.5 MS/s. This might help. > > > On Thu, Apr 26, 2018 at 6:11 AM, Derek Kozel <derek.ko...@ettus.com> > wrote: > >> 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 >> >> > > > -- > Martin K. >
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