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Peak at the begining and end of range FFT

Part Number: IWR1843BOOST

Hello,

I am creating my own post process script and i am facing an issue concerning peaks at the begining and end of RangeFFT, even if i don't have obstacles in front of the radar

This uploaded image is the RangeFFT for one chirp. We can see the peak at 0 frequency.

When i put 2 obstacles in front of the radar, one at 2 meters and the other one a 4 meters i get the following rangeFFT

Two peaks are visibles at 2 meters and 4 meters but close peak  still present.

I have a complex1x setup.

The peak at the end seems normal cause with complex1x, we have to cut range FFT at 0.9*fs and this peak is inside the last 10%

Someone has a explanation concerning this peak and how to minimize it ?

Is a calibration usefull to reduce this peak?

thanks