Thanks for your reply... > Perhaps you are in a particularly bad multipath environment? Although I agree > that changing the power should have more than a tenth of a dB effect on the > SNR. Have you tried turning it down? Or really, can your plot the spectrum at > the receiver and verify that the power is actually changing? It actually turned out, that I've forgotten to specify the right antenna on my UHD sink/soure and therefore was receiving cross talk from the second channel. I'm still a freshman on GNUradio :-).
> Also, the SNR estimator in gr_probe_mpsk_snr_c is not the most robust > estimator at low SNR. It gets biased when calculating the mean by any samples > over the decision boundaries with the effect of having an "irreducible" SNR > (that's not really the right word for it, but I'm relating it to being the > opposite of an irreducible BER in multipath channels). But I think this point > is around 3 - 4 dB, but it's been a while since I've looked at it. > > This reminds me that I have three other SNR estimators that do an excellent > job at low SNR (theoretically, in the mythical AWGN channels) that I really > need to put into GNU Radio. They are increasingly better at their estimates > at the expense of computational complexity (e.g., one uses the skewness while > another uses the kurtosis). Would be a nice move... Daniel _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
