Juan, overflows happen on the SDR hardware! No wonder you're not seeing them when reading samples from a file... A file doesn't care how fast you process it, whereas a SDR device needs your computer to process the samples as fast as it produces them.
So, whatever CPU utilization you observe with a file is completely irrelevant to the question whether your PC is fast enough to process these samples in real-time. What counts is that the signal processing throughput, including handling the hardware overhead, is above the sampling rate for any but the shortest-term average. Best regards, Marcus On Thu, 2018-03-15 at 22:33 +0100, Juan Antonio wrote: > When I work with adv16.cfile my 4 cores work almost 100% but there is > no ovwerflow and the constellations hook > > When I work with a file recorded with gqrx of 8k 1/4 2/3 64 QAM my 4 > cores work at 50%, there is no overflow and the constellations do not > latch. This same file reproduced with osmosdr sink is reproduced > without any problem with a receiver of dvbt > > When I work directly with the hackrf with a channel 8k 1/4 2/3 64 QAM > there is a lot of overflow, the constellations do not engage and the > cores work at 50% > > I can think of two things: > > Try with a file similar to adv16.cfile but 64 QAM (I do not have it) > > And 2nd that there is some parameter in some block that does not > correspond with 64 QAM > > Best Regards > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
smime.p7s
Description: S/MIME cryptographic signature
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
