On the modeling of fading multipath indoor radio channels

Multipath profiles obtained from propagation measurements done on several manufacturing floors and college campus laboratories at 910 MHz are analyzed to model the arrival of the paths, the respective amplitudes of the paths, and the received power. The discrepancies between the empirical distribution of the arriving paths and Poisson arrivals are discovered. The modified Poisson process is shown to fit the arriving paths closely. Rayleigh, Weibull, Nakagami, log-normal, and Suzuki distributions are considered as potential models for the amplitude of the arriving paths. The path amplitudes are shown to closely follow a log-normal rather than a Rayleigh distribution. The delay power spectrum is shown to fit an exponential function closely. The statistics of RMS multipath delay spread and the values of the distance/power law gradient are also computed and compared for these experimental sites. The interarrival times of the signals were modeled by the Weibull distribution. A model for the distribution of the number of signals was presented using the modified Beta distribution. Finally, for the data with no threshold at the receiver a suitable model for the distribution of the gain coefficients is found to be the log-normal distribution