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access icon free Optimising the inter-distance between transmitters in a multi-cell VLC system

© The Institution of Engineering and Technology
Received 27/06/2018, Accepted 11/12/2018, Revised 29/10/2018, Published 11/12/2018

In this study, the authors find the optimum inter-distance between visible light access points (VAPs) in a multi-cell system. This is an important issue to avoid the lack of resources resulting from wiring too few VAPs while minimising the installation cost. This study uses a one-dimensional corridor model suitable for many practical environments such as train aisles and hospital/library corridors. They provide formulas for the average rate achieved per user to determine the optimal inter-VAP distance. These formulas depend on information that is usually available in the design step such as the corridor dimensions, luminaries' parameters, and user density. They consider different power allocation techniques and different frequency reuse factors. The analysis shows that the optimum inter-VAP distance depends mainly on the corridor dimensions and not as much on the communication technique. Higher frequency reuse factors reduce the interference and improve the performance in the case of small cells. Specifically, the results determine the corridor dimensions that are better served by multi-VAP rather than a single centred VAP. Many important design issues are answered throughout this study such as how the ceiling height and the estimated crowdedness in the corridor affect the optimum cell size.

Inspec keywords: optimisation; frequency allocation; interference suppression; cellular radio; free-space optical communication

Other keywords: multiVAP; hospital corridors; optimum interdistance; communication technique; library corridors; optimal interVAP distance; installation cost minimisation; optimum cell size; user density; frequency reuse factors; corridor dimensions; optimum interVAP distance; visible light access points; multicell VLC system; one-dimensional corridor model; power allocation techniques; train aisles

Subjects: Electromagnetic compatibility and interference; Free-space optical links; Mobile radio systems; Optimisation techniques

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