Abstract
Abstract In this article, we present channel delay profiles based on simulated data regarding the practical conditions for the use of visible light communication (VLC) in automotive applications such as Intelligent Transportation Systems (ITS). Practical vehicular LED headlamp and street lamp that consider the lighting regulation for transportation are used to design the ITS scenarios based on VLC. We modeled two usage scenarios, crossroad and metropolitan street, using the CATIA V5 tool. Measurements for the VLC channel delay profile evaluation were then gathered by using a ray-tracing scheme employing commercial LightTools software under the vehicle-to-vehicle and vehicle-to-infrastructure (V2I) communication links. From the obtained channel impulse responses from both scenarios, we derived the VLC channel delay profiles. From them, we found that the common property of the delay profile was composed of dominant multiple line of sight (LOS) links and a less number of non-LOS delay taps. However, the channel delay profile for the V2I link and metropolitan scenario show more dispersive channel characteristics due to the reflection and diffusion of the visible light.
Highlights
Next-generation LED lighting has more advantages than existing fluorescent and incandescent lighting in terms of its long life expectancy, high tolerance to humidity, low-power consumption, and minimal heat generation
We present a visible light communication (VLC) channel delay profiles based on simulated data regarding the practical Intelligent Transportation Systems (ITS) usage scenario
From the derived channel delay profiles, we can observe that the common property of the delay profile was composed of dominant multiple line of sight (LOS) links and a less number of non-LOS (NLOS) delay taps
Summary
Next-generation LED lighting has more advantages than existing fluorescent and incandescent lighting in terms of its long life expectancy, high tolerance to humidity, low-power consumption, and minimal heat generation. In order to describe the practical VLC channel more precisely, we considered the lighting regulation for transportation, such as the light distribution for vehicular LED headlamps and street lamps and other optical properties when designing the ITS scenario. Measurements for VLC channel delay profile evaluation were gathered using a Ray-Tracing scheme employing LightTools [14] software, a widely accepted commercial optical engineering tool, in vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) cases. These tools are efficient when determining optical channel models, since they provide visual understanding and enable the practical modeling of simulation environments. The delay profile for the V2I link and metropolitan scenario shows greater dispersive channel characteristics due to the reflection and diffusion of the visible lights
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