Multiaccess interference in a non-line-of-sight ultraviolet optical wireless sensor network

Area of Science:

• Wireless Communication
• Sensor Networks
• Optical Communication

Background:

• Non-line-of-sight (NLOS) communication leverages scattering properties and the absence of solar radiation in the solar-blind ultraviolet (UV) spectrum.
• Wireless sensor networks (WSNs) can benefit from NLOS communication for enhanced connectivity.

Purpose of the Study:

• To address the challenge of multi-access interference (MAI) in NLOS WSNs operating in the solar-blind UV range.
• To develop a metric for evaluating sensor node distribution scenarios and identify performance limitations.
• To provide design guidelines for robust NLOS WSNs.

Main Methods:

• Utilized a Poisson model to represent sensor node distribution under varying densities and traffic levels.
• Derived a novel metric for evaluating sensor node distribution scenarios.
• Analyzed the cumulative effect of interference from distant nodes and the trade-off between node redundancy and isolation.

Main Results:

• Quantified the impact of MAI on NLOS WSN performance based on node density and traffic.
• Identified key performance limitations inherent to solar-blind UV NLOS WSNs.
• Demonstrated that network traffic control significantly contributes to system operability.

Conclusions:

• Effective network traffic control is crucial for the operability of NLOS WSNs in the solar-blind UV spectrum.
• Design guidelines considering interference, hop count, and node distribution are essential for optimizing performance.
• The study provides a framework for understanding and mitigating interference in these specialized WSNs.