Analysis of Wall Structure Effects on Indoor Wireless Channel Parameters Using the FDTD Method

In this paper, the effects of wall structures on the parameters of realistic indoor wireless channel using two dimensional finite difference time domains (FDTD) method are investigated. Two types of wall are considered for the environment. In the first case, the walls are a type of concrete block with air gaps as inhomogeneous walls and, in the second case, the walls are a type of homogeneous oneswith effective constitutive parameters. For two cases, field coverage maps, average path loss, power delay profile and RMS delay spread are extracted and compared. Power delay profiles show that inhomogeneous walls create stronger multipath effects than homogeneous walls and that these effects are severe in none line of sight conditions. On average, the RMS delay spread for environment with inhomogeneous walls, in LOS conditions 5 ns and in NLOS conditions 8 ns is more than the environment with homogeneous walls.