Abstract
With the increasing development of 5G and Body Area Network based systems being implemented in unusual environments, propagation inside metallic structures is a key aspect to characterize propagation effects inside ships and other similar environments, mostly composed of metallic walls. In this paper, indoor propagation inside circular metallic structures is addressed and fast fading statistical distributions parameters are obtained from simulation, being assessed with measurements at 2.45 GHz in a passenger ferry discotheque with an 8 m diameter circular shape. It is observed that, in this kind of environments, second order reflections are particularly relevant due to the walls' high reflective nature. Globally, it is concluded that the Rayleigh distribution can be used to characterize fast fading effects with no significant loss of accuracy compared to the Rice one, since a low value of the Rice parameter is observed, being below 3.1 dB, even under Line-of-Sight conditions. Moreover, it is observed that, from the fast fading viewpoint, the best transmitter position is at the circle center.
Highlights
The increasing number of applications of wireless technologies, the fast progress in miniaturization of electronic devices and the increasing demand for human health monitoring has directed the attention of researchers, system designers and application developers to Body Area Networks (BANs)
Due to the discotheque dimensions and to typical situations occurring for BANs in off-body communications, two walking scenarios have been considered: approaching and departing
When one focus on the fading margin required for coverage planning purposes, it is concluded that, besides being an LoS situation, the Rayleigh Distribution can be used for modelling fast fading with a reasonable accuracy, since the difference in the fading margin obtained from the Rice Distribution with K = 3.1 dB and the one obtained from the Rayleigh distribution is 2.4 dB
Summary
The increasing number of applications of wireless technologies, the fast progress in miniaturization of electronic devices and the increasing demand for human health monitoring has directed the attention of researchers, system designers and application developers to Body Area Networks (BANs). The above-mentioned studies have been done for corridors (with rectangular cross sections) and passengers’ cabins, while the focus of this paper is a circular (cylinder and hemisphere structured) indoor environment, composed of metallic (almost perfect conducting) walls, which has different propagation conditions. Since this kind of environments has some particular characteristics, namely the high reflective nature of the walls and the circular geometry that lead to different zones where a different number of reflections is observed, propagation inside circular structures is addressed, paving the way to properly understand the radio channel in this kind of environments.
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