Performance Analysis of an Outdoor Visible Light Communications System for Internet-of-Vehicles

TL;DR

This paper evaluates an outdoor visible light communication system for Internet-of-Vehicles, deriving analytical expressions for system performance metrics and analyzing how turbulence and distance affect reliability and capacity.

Contribution

It introduces novel closed-form equations for outage probability and ergodic capacity in an OVLC IoV system with an AF opportunistic scheme.

Findings

Performance improves with lower turbulence.

System performance degrades as vehicle distance increases.

Analytical models accurately predict system behavior.

Abstract

This paper looks at the performance of an outdoor visible light (OVLC) communication system used for Internet-of-Vehicles (IoV). In the proposed system an amplify-and-forward (AF) opportunistic scheme is used to extend the range of information broadcast from a traffic light to vehicles. The Gamma-Gamma channel gain and the Lambertian direct current (DC) channel gain are used to model the fading coefficient of each transmission and the short and thermal noise models used to represent the system noise. The statistics of the system are examined by deriving closed-form expressions for the cumulative distribution function (CDF) and probability density function (PDF) for the equivalent end-to-end signal-to-noise ratio (SNR). Novel closed form equations are also developed for the outage probability and ergodic capacity. Numerical simulations performed showed that the system performance in terms of both outage probability and ergodic capacity improves with decreasing turbulence intensity. Results also illustrate that, as the distance between the vehicles increases, the system performance is more deteriorated.