EM framework where the field perturbations induced by human bodi(es) are modeled as a superposition of diffraction and multipath terms. The diffraction component is defined according to the scalar diffraction theory (see above) and it is characterized by the geometrical description (i.e., location, size, and orientation) and the movement characteristics (i.e., rotations and random movements around the nominal position) of the targets according to the knife-edge hypothesis.