Mathematics behind probe.level()

Hi,

I want to do energy detection of received signal, And after searching I
was advised to use probe block to do the sense.
(gr.probe_avg_mag_sqrd_f).

Can anyone explain how this works. How level() method gives the energy
level. I need mathematic behind this function. Is this calculates based
on FFT or what?

Please help

and please add my email on reply.([email protected])

dilip


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