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Indoor receiving signal strength based visible light positioning enabled with equivalent virtual lamps
Applied Optics
|September 14, 2023
Summary
This study introduces a mirror-assisted visible light positioning (VLP) method to improve indoor navigation accuracy. By utilizing reflections, it enhances positioning performance and enables VLP with fewer light-emitting diodes (LEDs).
Area of Science:
- Optical Wireless Communications
- Indoor Positioning Systems
- Wireless Sensor Networks
Background:
- Visible light positioning (VLP) offers a promising alternative for indoor positioning.
- VLP system performance is constrained by wireless optical channel characteristics, including shadowing, obstacles, and multipath propagation.
- These limitations can lead to positioning failures in practical indoor environments.
Purpose of the Study:
- To propose and evaluate a novel mirror-assisted VLP method to overcome indoor positioning challenges.
- To enhance the robustness and accessibility of VLP systems, particularly in scenarios with limited line-of-sight (LOS) links.
- To improve positioning accuracy and enable VLP with reduced infrastructure requirements.
Main Methods:
- Development of a mirror-assisted VLP system incorporating specular reflection into the received signal strength (RSS) algorithm.
- Modeling the system using equivalent virtual lamps to account for reflected signals.
- Simulation analysis in a standard four-LED room environment to assess performance improvements.
Main Results:
- The proposed mirror-assisted VLP method effectively mitigates non-line-of-sight (NLOS) interference by leveraging specular reflections.
- Average positioning performance demonstrated a significant improvement of 25% with the addition of a mirror.
- The system enables trilateration positioning even with only two available light-emitting diodes (LEDs), achieving accuracy of approximately 30 cm under NLOS conditions.
Conclusions:
- Mirror-assisted VLP is a viable strategy to enhance indoor positioning accuracy and reliability.
- The approach effectively addresses multipath propagation and limited LED accessibility issues.
- This technique broadens the applicability of VLP, particularly in challenging indoor environments.
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