Statistics of Shadowing in Indoor Radio Channels at 900 and 1900 Mhz

This paper describes measurements which were performed to characterize shadowing in indoor radio environments. The log-normal shadowing model has been traditionally used to characterize the large scale fading component of the received power envelope in mobile and portable radio channels [1,2]. In this research we investigated the suitability of the log-normal shadowing model for indoor radio channels and determined how the parameters of the log-normal shadowing model are dependent on frequency and topography. We will show in this paper that the correlation coefficient can be completely independent of wavelength over a frequency octave, however, it is highly dependent on the specific topography of the building. Furthermore, we discuss mechanisms for shadowing which explain why the shadowing component is nearly identical for two frequencies in one environment while in other environments, the shadowing components at two frequencies are virtually independent.