IN-BUILDING RADIO PROPAGATION AT 900 MHZ IN MULTI STORIED BUILDING

Abstract

The proliferation of PCS has necessitated the complete characterization of radio channels existing inside buildings. The indoor radio channel differs from the conventional mobile radio channel in two aspects. First of all the distances taken in account are a lot small, and then the inconsistency of the environment is much larger for a smaller range of distance between transmitter and receiver. Indoor use of wireless systems poses one of the major design challenges, as indoor radio (RF) propagation is essentially a complex phenomenon. In this paper we will try to emphasis on this odd subject and will try to compute and place boundaries for use of wireless systems within buildings at 900 MHz. There are many good system design tools which have been developed solely for ground mobile cellular systems. However, no proper design tools have been developed for both ground mobile communication and in-building communications operated within one cellular system. As cellular systems are operated today, in-building communication is provided by transmitting radio signals from cell sites so that they penetrate the building walls to reach portable handsets inside buildings. In-building communication is harder to perform on the reverse link (portable-to-base link) than the forward link. Du to this it is difficult to mathematically put the model for all telecommunication systems in a single equation so many models coexist for different types of radio links for different situations. In this paper statically modelled is been explored. . The model rely on computing the median path loss for a link under a certain probability that the considered conditions will occur The modelling is done using simple measurements made especially for an intended communication system or spectrum allocation. This paper present radio signal propagation measurement and modelling at 900MHz, within a Hotel building in the city of Udaipur (India).