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Interference Mitigation for Visible Light Communications in Underground Mines Using Angle Diversity Receivers.

Pablo Palacios Játiva1, Milton Román Cañizares2, Cesar A Azurdia-Meza1

  • 1Department of Electrical Engineering, Universidad de Chile, Santiago 8370451, Chile.

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|January 16, 2020
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Summary

This study introduces angle diversity receivers (ADRs) to reduce interference in underground visible light communication (VLC) systems. A novel hemi-dodecahedral ADR with maximum ratio combining (MRC) achieved high data rates up to 250 Mbps.

Keywords:
angle diversity receiverinter-cell interferencesignal combining schemeunderground miningvisible light communication

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Area of Science:

  • Optical Communications
  • Wireless Communication Systems
  • Mining Engineering

Background:

  • Underground mining environments present unique challenges for wireless communication, including significant inter-cell interference (ICI).
  • Visible Light Communication (VLC) systems offer a potential solution but require robust designs to overcome signal degradation and interference.
  • Existing VLC systems struggle with the complex channel conditions found in mining settings, necessitating advanced receiver technologies.

Purpose of the Study:

  • To propose and evaluate novel Angle Diversity Receivers (ADRs) for mitigating inter-cell interference (ICI) in underground mining VLC systems.
  • To develop and model realistic VLC systems for two distinct mining scenarios: mining roadways and mine working faces.
  • To assess the performance of ADRs against a baseline single photo-diode receiver under various channel conditions and noise factors.

Main Methods:

  • Development and modeling of a realistic VLC system incorporating line-of-sight (LoS) and non-line-of-sight (NLoS) links, thermal, and shot noises.
  • Design and mathematical formulation of two ADRs: a pyramid distribution and a novel hemi-dodecahedral distribution.
  • Performance evaluation using signal combining schemes, including Maximum Ratio Combining (MRC), and analysis of key metrics like data rate and signal-to-interference-plus-noise ratio (SINR).

Main Results:

  • Both proposed ADR solutions met minimum lighting standards in the simulated mining environments.
  • Root-mean-square delay spread decreased with increasing transmitter-receiver distance.
  • The hemi-dodecahedral ADR with MRC demonstrated superior performance, achieving data rates of 250 Mbps (mining roadway) and 120 Mbps (mine working face) at a Bit Error Rate (BER) of 10^-4, with high SINR values.

Conclusions:

  • Angle Diversity Receivers (ADRs) are effective in mitigating ICI in underground mining VLC systems.
  • The novel hemi-dodecahedral ADR design, combined with MRC, offers significant performance improvements over traditional receivers.
  • The proposed system demonstrates the feasibility of high-speed VLC in challenging underground mining conditions.