In a real system the signal would be a preamble, which would normally be used for synchronization purposes at the receiver end (For example PLC system).
"I'm not quite sure what you mean by "cyclic noise", but the example you give is 50 Hz (or 60 Hz) hum, so a narrowband interference." Cyclic noise, perhaps my understanding is incorrect. In a PLC system, the noise rejection system uses a Zero Cross detection to detect the beginning of a power cycle (50Hz/60Hz). During the cycle at the same phase point, noise repeatedly occurs. So on a scope you would see a nice sine wave for the power and noise which repeats at the same phase point in the power cycle. This is different from the 50 Hz noise I suggested previously. However the idea/hope is that this noise is narrow band noise and because of its repetitive behaviour, .i.e. occurring in the same point in the cycle, and relatively stable amplitude, it should be possible to remove it from a known signal. I will take on board all the useful advice and continue my studies. -- View this message in context: http://gnuradio.4.n7.nabble.com/Calculating-additive-noise-power-for-known-signal-tp61281p61302.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