Abstract
The unlicensed industrial, scientific, and medical (ISM) band at 2.4 GHz has gained increased attention recently due to high data rate communication systems developed to operate in this band. In this paper the investigation of the indoor electromagnetic propagation and indoor radio channel characteristics have been performed at this band. Electromagnetic waves propagate by means of reflection, refraction, and diffraction. Reflection mechanisms are dependent on the nature of the surface, dielectric properties, polarization, incidence angle, and material thickness. The effect of the incidence angle and material thickness on the reflection coefficients for both horizontal and vertical polarization has been studied. Two-dimensional ray-tracing simulation has been performed to show the influence of building electromagnetic properties on indoor radio channel parameters, signal level, RMS delay spread, and coherence bandwidth. Results show the influence of the permittivity is more important than the influence of the order of reflection considered for the ray- tracing model. It is shown that, compared with power level, RMS delay spread is more sensitive to the building dielectric parameters. Maximum RMS delay spread is dependent on the dielectric parameters of the surrounded walls. Keywords: Radio propagation, Dielectric parameters, Indoor Channel Parameters
Highlights
Analysis of indoor radio channel characteristics is important for the design and development of personal communication systems
It is worth mentioning that the dielectric material properties for the materials used in this paper were taken from [2], which are measured at the same band
Reflection Coefficients Characterization: Four various types of building materials were used to study the characterization of reflection coefficients as a function of the incidence angle, these materials are, 12mm glass, 8mm chipwood, 38mm thickwood, and 40mm door
Summary
Analysis of indoor radio channel characteristics is important for the design and development of personal communication systems. Refraction and diffraction of radio waves by objects such as walls, windows, doors and furniture inside the building, the direct path from transmitter to receiver is often blocked and there are many additional signal paths present due to reflections off of the walls, floors, and ceilings of the building. Effects of these propagation mechanisms on the radio wave are determined by the electromagnetic properties of those surrounding structures. It is worth mentioning that the dielectric material properties (permittivity and conductivity) for the materials used in this paper were taken from [2], which are measured at the same band
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