Wide-Band Measurements of Nondeterministic Effects on the BRAN Indoor Radio Channel

Abstract

External nonstatic effects on the indoor radio channel can be classified according to their natures; they can be quasistatic, as are those due to the furnishing and decoration of rooms, or clearly dynamic, as are those forced by the movement of people and pets within the propagation environment. So, it can be stated that people acting and walking nearby the antennas of radio-communication systems introduce nondeterministic effects in the radio channel, whereas walls, ceiling, floors, and even doors and windows are structural elements whose influence can be modeled by ray-tracing tools, the activity of people (both movement and variations in the distribution of elements such as furniture or decorative objects) introduces stochastic components in the channel characteristics prediction. Deterministic tools cannot model these effects, but their experimental knowledge will allow radio-network designers to keep guard values for the different design parameters at the same time that they plan the radio network. In this manner, the quality of service provided by these communication systems could be preserved. This paper shows the results and analysis of measurement campaigns performed in static and dynamic conditions, in order to compare the behavior of both narrow and wide-band parameters of the radio channel, including people activity within the environment.