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IWR1642: How to convert FFT output to dBFs

Part Number: IWR1642

Hi,
I want to convert the range FFT output to receive power dBm with IWR1642.

 
RadarStudio_matlab_scaling.pdf

With reference to these threads, I found that the following conversion formula could be used for calculation.

But I don't understand what Pout (fft) means in this formula.
Could you please tell me the formula to calculate Pout (fft)?


Best Regards,
Hiroyuki Taguchi