Traffic light to vehicle visible light communication channel characterization

Cui, Kaiyun; Chen, Gang; Xu, Zhengyuan; Roberts, Richard D.

doi:10.1364/ao.51.006594

Cited by 60 publications

(21 citation statements)

References 20 publications

(26 reference statements)

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“…According to [22] the measured electrical power spectrum of the solar radiation is almost a direct current (DC), which can easily be removed by AC coupling. However, the shot noise induced by the solar radiation remains the main source of noise for C2C VLC systems during the daytime [22,23].…”

Section: Noise Analysismentioning

confidence: 99%

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Fundamental analysis of a car to car visible light communication system

Luo

Ghassemlooy

Minh

et al. 2014

2014 9th International Symposium on Communication Systems, Networks &Amp; Digital Sign (CSNDSP)

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This paper presents a mathematical model for carto-car (C2C) visible light communications (VLC) that aims to predict the system performance under different communication geometries. A market-weighted headlamp beam pattern model is employed. We consider both the line-of-sight (LOS) and non-lineof-sight (NLOS) links, and outline the relationship between the communication distance, the system bit error rate (BER) performance and the BER distribution on a vertical plane. Results show that by placing a photodetector (PD) at a height of 0.2-0.4 m above road surface in the car, the communications coverage range can be extended up to 20 m at a data rate of 2Mbps.

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Section: Noise Analysismentioning

confidence: 99%

“…According to [23], artificial light induced interference has lower intensity than the solar radiation with the frequency spectrum mainly at the low frequency region (i.e. below a few hundreds of kHz).…”

Section: Noise Analysismentioning

confidence: 99%

Fundamental analysis of a car to car visible light communication system

Luo

Ghassemlooy

Minh

et al. 2014

2014 9th International Symposium on Communication Systems, Networks &Amp; Digital Sign (CSNDSP)

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show abstract

“…LEDs also have the advantage that their light output can be modulated with high-frequency signals. Besides indoor wireless communications, VLC technology can be applied to other applications such as the VLC between a traffic light and a vehicle [16] or outdoor wireless optical communications also called free-space optical communication [17][18][19]. VLC has gained much attention as a strong candidate for future indoor wireless communication because of several advantages including its unregulated huge bandwidth (nearly 400 THz) and not causing electromagnetic interference [15].…”

Section: Introductionmentioning

confidence: 99%

“…VLC has gained much attention as a strong candidate for future indoor wireless communication because of several advantages including its unregulated huge bandwidth (nearly 400 THz) and not causing electromagnetic interference [15]. Besides indoor wireless communications, VLC technology can be applied to other applications such as the VLC between a traffic light and a vehicle [16] or outdoor wireless optical communications also called free-space optical communication [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Half‐duplex visible light communication using an LED as both a transmitter and a receiver

Kim

Lee

2015

Int J Communication

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In typical visible light communication (VLC) systems, light-emitting diodes (LEDs) are used as optical transmitters and photodiodes are used as optical receivers. Currently, many communication devices such as smart phones have a built-in LED lamp whereas they usually do not have a built-in photodiode. If we find a way to receive VLC signals without the need to add an additional photodiode on the communication devices, it will contribute to the spread of VLC. Therefore, we propose and demonstrate a VLC scheme without the need for a photodiode. As the first step, we investigate the characteristics of an LED as a VLC receiver and find out that an LED can also be used as a VLC receiver in certain conditions. Then, we demonstrate a half-duplex VLC system using an LED as both an optical transmitter and an optical receiver, without the need for a photodiode. This technique could be used in various applications such as the VLC between smart phones with a built-in LED lamp and the VLC between LED traffic lights.

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“…The main trend is to use concepts from the visible light communication (VLC) standard, IEEE 802.15.7 , which supports high‐data‐rate VLC up to 96 Mb/s by fast modulation of optical light sources in ITS system . The advantages of OW technology in comparison with RF are the following : (i) the visible light spectrum is not regulated globally; (ii) VLC links are visible so that installation of roadside equipment is much easier or already exists, such as light‐emitting diode (LED) traffic lights or LED billboards; (iii) high signal‐to‐noise (SNR) can be achieved, because LED light sources are for illumination purposes and hence generally have high radiation power; and (iv) VLC is line of sight and, as a result, provides secure transmissions to only neighbouring vehicles, and interference from sources that cannot be seen is eliminated. The OW principle is simple; an electrical signal from the transmitter is converted to a modulated optical signal by the LED and carried by the illuminating light to the optical receiver implemented by an imaging sensor.…”

Section: Introductionmentioning

confidence: 99%

Optimised optical wireless car‐to‐traffic‐light communication

Arnon

2014

Trans. Emerging Tel. Tech.

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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.

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Traffic light to vehicle visible light communication channel characterization

Cited by 60 publications

References 20 publications

Fundamental analysis of a car to car visible light communication system

Fundamental analysis of a car to car visible light communication system

Half‐duplex visible light communication using an LED as both a transmitter and a receiver

Optimised optical wireless car‐to‐traffic‐light communication

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