Optimised optical wireless car‐to‐traffic‐light communication

Abstract

Intelligent transport systems have become the major technology for increasing road safety and traffic efficiency, as well as for reducing the number of road casualties. Radio frequency and optical wireless communication technologies have been proposed as a means for establishing communication between vehicular and road infrastructure, such as traffic lights, billboards and road infrastructures and for providing inter-vehicular communication. These technologies provide one-way or two-way short-range to medium-range wireless communication links that are specifically designed for the automotive sphere. The technology that is analysed in this paper is optical wireless communication. This technology modulates optical data on top of the illumination in the traffic lights and in the automotive lighting and detects the information using fast imaging sensors. Using knowledge of the amplitudes of the signal and the noise in each pixel, we tune adaptively and separately the gain of each individual pixel in the imaging sensor for communication signals. Tuning the gain is based on the mathematical model derived in this research. Comparison is made between the adaptive model and the standard model. From the mathematical analysis and the results of the comparison, it is clear that this model significantly improves communication system performance. In our numerical calculation for a given set of parameters, the signalto-noise ratio of the standard system and the adaptive system changes from more than 7 10 4 to more than 7 and less than 2 10 3 to more than 30 for a change in transmitter power from 10 to 100 watts respectively.

Visible Light Communication System Based on Software Defined Radio: Performance Study of Intelligent Transportation and Indoor Applications

“…VLC seems to be capable technology for short-range or possibly in the future even long-range communications. Future appliances vary greatly, spanning from vehicle-to-vehicle [4][5][6][7][8][9] communications, infrastructure-to-vehicle communications or simply as an alternative to typical local area networks (LAN) [10,11].…”

Visible Light Communication: A System Perspective—Overview and Challenges

“…ITS relies on reliable, robust and secure communication among vehicle and infrastructure (traffic lights, billboards). VLC is proposed for ITS communication to complement or replace the existing crowded RF-based communication [ 11 , 12 ]. All vehicles are equipped with head and tail lights that can be used for transmitting information.…”

“…Standardisation efforts such as visible light communications association (VLCA) standards and IEEE 802.15.7 shows that VLC would augment existing wireless networks in coming years. VLC can have applications in indoor wireless communication [ 10 ], intelligent transport system [ 11 , 12 ], smart cities [ 13 ], localisation in warehouses/robotics [ 14 , 15 , 16 ], human sensing [ 17 ], safe and hazard-free data access in hospitals [ 18 ], toys and theme parks [ 19 ], indoor point to point (PPP) communication and vehicular communication [ 12 ].…”

Impact of spatial sampling frequency offset and motion blur on optical wireless systems using spatial OFDM

“…Consequently, the radio frequency (RF) spectrum is becoming more and more congested. Multiple-input multiple-output (MIMO) optical wireless communication (OWC) [1][2][3][4][5][6][7][8][9][10] is considered as a supplemental technology to RF links for many high data rate applications. MIMO OWC can have either a nonimaging or an imaging receiver.…”