Interrupting Output Spectrum -----------------------------
The actual mapping from the levels at the daughterboard antenna input port to the output analysis values depends on a lot of factors including the used daughterboard RF gain and decimation specific gain in the digital down converter. You'll need to calibrate the system if you need something that maps to dBm.Currently, the output of usrp_spectrum_sense is the magnitude squared of the FFT output. That is, for each FFT bin[i], the output is Y[i] = re[X[i]]*re[X[i]] + im[X[i]]*im[X[i]]. If you want power, take the square root of the output. ======================================================================================== Hi, Firas In my opinion the ouput Y[i] has the same dimension with the power. If we square root the output, and divide it with the fft bin numbers, then we get the voltage magnitude. Am I right? Best Regards, Ling -- View this message in context: http://www.nabble.com/Some-usrp_spectrum_sense.py-code-Explanation-tp21209623p21214158.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
