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IWR6843: Derivation of Relative Power from Range profile in OOB Demos

Part Number: IWR6843

Hi, 

How to convert Range profile (Array of profile points at 0th Doppler) obtained using out of the box demo to  relative power in dB shown in the Demo visualizer. 

I already checked the Demo visualizer code and found the equation to do this. I am trying the understand the derivation behind this equation.

Note : Checked few threads on this (https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/821420/iwr6843isk-ods-how-to-calcurate-relative-power). Derivation is not clear for me from the answers. 

Could you please help? 

Thanks 

Gayatri