Propagation of 2000 MHz radio signal into a multistoreyed building through outdoor-indoor interface

Mobile communication systems are being developed operating both in outdoor and indoor environments. This calls for establishment of effective communications. IEEE-802.11b also provides wireless connectivity in both of these environments. We have made study in the scenario when a mobile user enters into an indoor environment from outside environment and establishes communication inside. This paper reports propagation measurements for two situations at 2000 MHz. In order to simulate, a source at 2000 MHz is used to illuminate the building from outside. Theoretical models have been used to calculate penetration loss, Rician factor ´K´ and other channel parameters. It has been observed that when the transmitter illuminates the building from outside, the received signals inside the building attenuates severely. The received signal distribution follows d^-m power law. Measurements reveal that the received signals are attenuated by approximately 40-45 dB in the corridors of different floors. The movements of people greatly vary amplitudes of the transmitted signal and make the indoor channel nonstationary even when either both the transmitter and receiver are stationed at a particular position or transmitter is fixed and receiver moves. This aspect has also been reported in this paper.