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[Discuss-gnuradio] mathematics behind probe.level( )

From: dilip thapa
Subject: [Discuss-gnuradio] mathematics behind probe.level( )
Date: Fri, 30 Aug 2013 09:20:04 +0000

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
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