IWR6843AOP: How to mitigate the inference of quilt when we run vital sign

Hi experts

When we do vital sign monitoring on IWR6843AOP,  if the target is covered in quilt, we would have to consider if the signal of radar could penetrate it or not.

But the quilt will also move when target is breathing. Is there any algorithm in our vital sign demo to mitigate the inference from movement of quilt?

Thanks

Ken