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## [Discuss-gnuradio] Re: Spectrum Sense - Convert FFT Data into dBm propor

**From**: |
Bruhtesfa Ebrahim |

**Subject**: |
[Discuss-gnuradio] Re: Spectrum Sense - Convert FFT Data into dBm proportional values |

**Date**: |
Tue, 3 Feb 2009 15:49:14 +0100 |

TMob wrote:
>* Is it correct to just subtract 20 times the log of the window power to*
>* remove the window processing gain from the data?*
>* Is subtracting the gain correct to get somewhat proportional values?*
>* *
>* Thank you very much in advance!*
>* *
>* TMob*
Eventhough, I am not clear about what you are doing(i am a new one),I
know from FFT theories that the computed FFT should be normalized by
1/sqrt(N) to preserve the energy(where N is size of FFT u take).
That means, 10*log(N) should be substracted from the computed FFT power
to get same power as the one computed in time domain.
Bruhtesfa
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