Experimental Demonstration of Vehicle to Road Side Infrastructure Visible Light Communications

Abstract

The increasing use of light emitting diodes in traffic lights offer excellent opportunities for implementation of visible light communications (VLC) based wireless technology as part of intelligent transport systems in smart environments. In this paper, we experimentally demonstrate vehicle to infrastructure (V2I) communications based on the VLC technology using a real traffic light and a camera over a link span of up to 80 m. We show a reduction in the modulation depth of the signal from 100% to 50% in order to track the light source when sending '0' symbols. Also presented is the effect of operating the camera in the focused and defocused modes. The results show transmission success rates of 100% and 90% over link spans of 70 m and 80 m, respectively under specific test conditions.

Noise Resilient Outdoor Traffic Light Visible Light Communications System Based on Logarithmic Transimpedance Circuit: Experimental Demonstration of a 50 m Reliable Link in Direct Sun Exposure

“…On the other hand, the vehicular VLC systems presented in [47][48][49][50][51][52] are developed while considering the communication range as the main priority. Again, one can see that even if the communication distance is significantly increased, in most cases the experimental testing procedure is totally different compared to the real life use case.…”

“…So, many of these systems are evaluated in rather friendly conditions, compared to a worst case scenario imposed for vehicular applications. So, referring to communication distances, the VLC system presented in [47] is able to achieve a range of 70-80 m at a bit rate of 30 b/s in the absence of direct incident light by using a low cost camera based VLC receiver. Also based on a camera VLC receiver, the authors of [48] report a 100 m communication range using off-line data processing.…”

The Utilization of Artificial Neural Network Equalizer in Optical Camera Communications

“…The camera-based Rxs can capture intensity-modulated light signals from a range of LED light sources (i.e., traffic lights, advertising boards, signage, display screens, vehicle head, and taillights, streetlights, etc.). The OCC technology together with the visible and infrared light transmission could be used in different low data rate R b applications, such as the Internet of Things (IoT) (e.g., as part of the fifth-generation wireless and beyond), motion capturing [ 1 ], intelligent transportation systems [ 2 ], indoor localization, security, virtual reality, and advertising [ 3 ]. OOC comprises a plurality of pixels (i.e., photodetectors (PDs)), where the signal strength of each pixel depends on the intensity of incident light [ 4 ].…”

Optimized Analog Multi-Band Carrierless Amplitude and Phase Modulation for Visible Light Communication-Based Internet of Things Systems

“…IoT-targeted VLC devices and systems are currently very limited, and they are in an early development state. Some scenario examples that can be found in the literature include Intelligent Transportation Systems (ITSs) [24,25], Visible Light Positioning (VLP) [13], VLC smart labels [26,27], and initialization of IoT devices for security improvement [28], amongst others, such as indoor healthcare data transmission, infotainment services, droneto-drone communications, and augmented/virtual reality, relying on both photodiode-and camera-based communications [29,30]. Although most proposed devices require significant processing resources, an effort to reduce their complexity and cost has also been pursued by some research teams, namely Corner Cube Retroreflectors (CCRs) (including batteryless devices) [31][32][33] and VLC backscattering architectures [34][35][36].…”