Abstract
Intelligent transport systems (ITS) rely upon the connectivity, cooperation and automation of vehicles aimed at the improvement of safety and efficiency of the transport system. Connectivity, which is a key component for the practical implementation of vehicular light communications (VeLC) systems in ITS, must be carefully studied prior to design and implementation. In this paper, we carry out a performance evaluation study on the use of different vehicle taillights (TLs) as the transmitters in a VeLC system. We show that, the transmission coverage field of view and the link span depend on TLs illumination patterns and the transmit power levels, respectively, which fail to meet the typical communication distances in vehicular environments. This paper proposes an infrared-based VeLC system to meet the transmission range in daytimes under Sunlight noise. We show that, at the forward error correction bit error rate limit of 3.8 ×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> , the communication distances of the proposed link are 63, 72, and > 89 m compared with 4.5, 5.4 and 6.3 m for BMW's vehicle TL at data rates of 10, 6, and 2 Mbps, respectively.
Highlights
T HE WIRELESS exchange of traffic information between the vehicles and roadside infrastructure, which is part of the Manuscript received July 23, 2020; revised November 12, 2020 and March 16, 2021; accepted April 25, 2021
We propose an IR-vehicular light communications (VeLC) system to mitigate this challenge for the following reasons: (i) Sunlight irradiance in the IR band is much lower than the visible band, which leads to improved signal to noise ratio performance
We carried out a performance evaluation study on the use of different vehicle TLs as Txs for visible vehicular light communications (V-VeLC) systems
Summary
T HE WIRELESS exchange of traffic information between the vehicles and roadside infrastructure, which is part of the Manuscript received July 23, 2020; revised November 12, 2020 and March 16, 2021; accepted April 25, 2021. Several vehicle mobility traces with two-dimensional locations were collected Both data were combined to perform analytical study and to further obtain experimental distributions of the received power for HL- and TL-based Txs. the issue of link asymmetry due to the significant differences in the radiation characteristics and PT between the HL and the TL was identified. In [11], the impact of vehicles’ HL and TL illumination patterns on the communications performance between vehicles travelling on the same- and different- lanes was studied by developing a novel V-VeLC simulation model based on accurate empirical data measurements. We have carried out BER performance analysis by considering a wide range of vehicle speeds and the Sunlight induced background noise
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