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IWR1443BOOST: range profile

Part Number: IWR1443BOOST

Hi,

when i have samples and i want to make a range profile. How to i calculate the axis of the graph?

What i did till now is 

1) calculate the absolute value of the fft of complex values for y-axis

2) plot the data as such . 

However i get this graph. This is a graph over 200 samples. i configured my range between  0.3m and 2m..

  

I need an x-axis, that only goes between 0.3 and 2. How do i calculate the rangebin relative to each sample.