# Motley-Keenan Model (MK)

The modified-free-space model analyzes the distances of the building between walls and penetration losses of the walls.

The model according to Motley and Keenan computes the path loss based on the direct ray between transmitter and receiver. In contrary to the modified free space model this model considers the exact locations of the walls, floors, and ceilings. Additional factors for absorption of the direct ray path by walls are considered.

(1) ${l}_{MK}={l}_{FS}+{l}_{c}+{k}_{w}{l}_{w}$

As shown in Figure 1 the parameter kw describes the number of walls intersected by the direct path between transmitter and receiver. A uniform transmission (penetration) loss lw for all walls is used for the computation, that is the material properties of the individual walls are not considered. This uniform transmission loss can be specified by using the Settings button.