Hi, In fact I have underruns in the transmitter which means according to the website you gave me, my transmitter is not producing data fast enough. I guess I need a better computer for that.
Just one more question: Are sampling rates of 20 and 25 MS/s too much for devices, more especifically, for cognitive radio? Josh Blum-3 wrote: > > > > On 05/01/2012 08:55 AM, frankist wrote: >> >> Hi, >> >> I was interested in working with detectors for OFDM 802.11b in my USRP2. >> I've read on the internet about this and it seems that there are people >> able to use sampling rates of 20 MS/s. >> >> However, when I try to send an OFDM signal with 20 MHz of bandwidth, at >> the USRP2 receiver board the FFT plot shows the signal blinking. >> > > I think you are seeing the result of an FFT over a sample discontinuity. > This discontinuity is due to overflow, in other words, your computer is > not able to process at this rate. > > http://files.ettus.com/uhd_docs/manual/html/general.html#overflow-underflow-notes > Are you seeing overflow (O's are being printed)? > > Are there any warnings printed by the driver? > (Answering some of those warnings can help with performance) > > Usually running an FFT display on RX data is not a big performance hit. > Any information about your PC that you can share? CPU? OS? > > -Josh > > _______________________________________________ > 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/Working-at-20-MS-s-tp33763341p33779586.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
