Hi, I am using a flowgraph to make a SNR estimation of a transmitted OFDM signal. The method I am using to estimate SNR calculates the difference between the power of the received signal and the noise floor.
In the low SNR case(-20 dB for example) I was getting, for a transmitter with constant gain, a SNR that varies a lot over time. Sometimes, I could get oscillations of 5 dB or maybe more for more than 200000 samples. I took some samples of the OFDM signal and store them in a file. What I noticed is that there are some "mute" parts in the received signal that appear from time to time as you can see in the picture http://old.nabble.com/file/p33688580/oscillation.jpg I wonder what is the explanation for this phenomenon -- View this message in context: http://old.nabble.com/Muted-parts-in-the-transmitted-signal-tp33688580p33688580.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
