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Reconfigurable intelligent surface-aided positioning-centered multi-LED integrated visible light communication and
Optics Express
|August 13, 2025
Summary
This study explores a reconfigurable intelligent surface (RIS)-aided visible light communication and positioning (VLCP) system. The RIS enhances positioning and communication, especially when line-of-sight links are blocked, paving the way for 6G technology.
Area of Science:
- Wireless communication systems
- Optical wireless communication
- Intelligent reflecting surfaces
Background:
- Visible light communication (VLC) and positioning (VLP) offer promising solutions for future wireless networks.
- Reconfigurable intelligent surfaces (RIS) can enhance signal propagation and overcome limitations like line-of-sight (LoS) blockage.
- Integrating RIS into VLC/VLP systems presents opportunities for improved performance and new functionalities.
Purpose of the Study:
- To investigate a reconfigurable intelligent surface (RIS)-aided integrated visible light communication and positioning (VLCP) system.
- To reduce sensitivity to line-of-sight (LoS) blockage in visible light systems.
- To simultaneously achieve robust communication and precise positioning capabilities.
Main Methods:
- Derivation of the Cramer-Rao lower bound (CRLB) for positioning accuracy.
- Channel state information (CSI) estimation to minimize pilot overhead.
- Joint optimization of RIS parameters and power allocation using alternative optimization (AO), Conditional Value-at-Risk (CVaR), and successive convex approximation (SCA).
- RIS assignment matrix optimized via the maximum received power chosen (MRPC) principle.
Main Results:
- The RIS effectively assists both communication and non-line-of-sight (NLoS) positioning when LoS links are blocked.
- The proposed optimization framework minimizes CRLB while adhering to system constraints.
- Simulation results validate the influence of RIS on positioning accuracy and demonstrate the trade-off between communication and positioning performance.
Conclusions:
- The RIS-aided VLCP system offers a viable solution for enhancing wireless communication and positioning capabilities.
- The system demonstrates resilience to LoS blockage, making it suitable for diverse environments.
- This technology shows significant potential for future 6G wireless networks.
