Statistical modelling and computer simulation of indoor radio channel

Multipath profiles obtained from radio propagation measurements at 910 MHz are used to analyse the statistical characteristics of the indoor radio channel. The data base is divided into two classes: manufacturing floors and college offices. In the manufacturing floors, there is plenty of open space without any presence of walls, as a result of which most of the received power is concentrated in the initial paths. The college office areas have a wider spread of power in delay, because of less open space and the frequent obstruction of the signal between the transmitter and the receiver by one or more walls. The statistical parameters required for computer simulation of multipath profiles in each environment are determined. The arrival of the paths is shown to fit a modified Poisson process and the amplitude of the paths follow a log-normal distribution. The mean and the standard deviation of the lognormal distribution are shown to decay exponentially with delay. To evaluate the performance of this simulation model, the distribution of the RMS delay spreads from the simulated profiles is compared with that obtained from the measured profiles.