Dear John, Thank you for such a prompt reply. Okay, we will remove the throttle blocks just now. But can you guide us how to achieve symbol synchronization then?
Best Regards, Huzaifa John Malsbury wrote: > > You do not need to use throttles when using a UHD sink/source, because > the device provides timing for the flowgraph. > > Remove the throttles and try again. If you still see the failure I'd > say you are not achieving symbol sync. > > -John > > > > On 04/08/2012 01:58 PM, Huzaifa Zafar wrote: >> Dear all, >> >> I am working with 3 people on a project involving GNU Radio and USRP1. >> We have tried to implement a simple point to point digital >> communication system in GRC involving DQPSK modulation. Using a vector >> source we are sending a finite stream of zeros and ones (the vector >> source has Repeat set to yes). On the receiver side, what we receive >> is really very strange: The same stream of zeros and ones, but with >> extra zeros in between our actual data. For example, we send three >> ones and three zeros, but what we receive is a one followed by seven >> zeros, another one followed by seven zeros, another one followed by >> seven zeros, and then a zero followed by seven zeros e.t.c. We tried >> to experiment more by using the 'KEEP 1 in N' block and the >> 'DECIMATING FIR FILTER', but things are not working out the way they >> should. >> >> I am also attaching a snapshot of the .grc file for your reference. >> Please tell us the reason why these extra zeros are present between >> our data bits, and the way to combat this effect (remember that the >> decimating fir filter and keep 1 in N block are not showing the >> desired output). Any kind of help is appreciated in advance. >> >> -- >> Huzaifa Zafar >> >> >> _______________________________________________ >> 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 > > -- View this message in context: http://old.nabble.com/Problem-with-USRP%21-tp33653047p33653144.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
