Modeling the Effect of Optical Signal Multipath

Area of Science:

• Optical wireless communications
• Indoor positioning systems
• Electromagnetic wave propagation

Background:

• Multipath propagation significantly impacts indoor optical wireless communication (OWC) systems.
• Signal reflections cause inter-symbol interference, degrading data rates and increasing indoor positioning errors.
• Accurate modeling is essential for mitigating these adverse effects.

Purpose of the Study:

• To develop a model for quantifying multipath effects in indoor environments with known characteristics.
• To address signal formation challenges in OWC and reduce positioning inaccuracies caused by multipath.
• To provide a computational method for analyzing multipath interference.

Main Methods:

• Analysis of the multipath phenomenon and theoretical framework development.
• Proposal of models for channel, emitter, and receiver behavior.
• Implementation of a numerical procedure using environmental, transmitter, receiver, and positional data.
• Validation through empirical tests in a controlled environment.

Main Results:

• The proposed model accurately characterizes channel impulse response and received signal strength.
• Numerical procedures effectively calculate multipath effects based on environmental parameters.
• Empirical validation confirms the model's predictive capabilities.
• Optimal cell size for discretization (1/20th of emitter-receiver distance) yields high accuracy with manageable computation.

Conclusions:

• The developed model provides a reliable tool for understanding and mitigating multipath effects in indoor OWC.
• Accurate environmental discretization is key to achieving high fidelity between model predictions and real-world performance.
• The findings contribute to enhancing the reliability of indoor optical communication and positioning.