Software Design of SMD LEDs for Homogeneous Distribution of Irradiation in the Model of Dark Room

Liner, Andrej; Pápeš, Martin; Jaroš, Jakub; Perecár, František; Hajek, Lukas; Látal, Jan; Koudelka, Petr; Vašinek, Vladimír

doi:10.15598/aeee.v12i6.1297

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…Minimal changes of photometric quantities are probably caused by the interference in the reflector part of the light which was necessary in terms of deployment of the system and also by slight variations of the operating temperature of the light. The final ratio between the strongest and the weakest point is in the customers' tolerance area and DRL (EL) and the break light satisfies the homogeneity condition [11], [12].…”

Section: Resultsmentioning

confidence: 99%

Study of LED modulation effect on the photometric quantities and beam homogeneity of automotive lighting

et al. 2015

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This paper discusses the implementation of a light emitting diode based visible light communication system for optical vehicle-to-vehicle (V2V) communications in road safety applications. The widespread use of LEDs as light sources has reached into automotive fields. For example, LEDs are used for taillights, daytime running lights, brake lights, headlights, and traffic signals. Future in the optical vehicle-to-vehicle (V2V) communications will be based on an optical wireless communication technology that using LED transmitter and a camera receiver (OCI; optical communication image sensor). Utilization of optical V2V communication systems in automotive industry naturally brings a lot of problems. Among them belongs necessity of circuit implementation into the current concepts of electronic LED lights control that allows LED modulation. These circuits are quite complicated especially in case of luxury cars. Other problem is correct design of modulation circuits so that final vehicle lightning using optical vehicle-to-vehicle (V2V) communication meets standard requirements on Photometric Quantities and Beam Homogeneity. Authors of this article performed research on optical vehicle-to-vehicle (V2V) communication possibilities of headlight (Jaguar) and taillight (Skoda) in terms of modulation circuits (M-PSK, M-QAM) implementation into the lamp concepts and final fulfilment of mandatory standards on Photometric Quantities and Beam Homogeneity.

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Section: Resultsmentioning

confidence: 99%

Study of LED modulation effect on the photometric quantities and beam homogeneity of automotive lighting

et al. 2015

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“…Similar and detailed analysis are performed in literature concerning phase distribution of a hexagonal array at fractional Talbot planes (Guo et al 2007), LED diffused transmission freeform surface design for uniform illumination (Zhu 2019), and software design of SMD LEDs for homogeneous distribution of irradiation in the model of dark room (Liner et al 2014).…”

Section: Soft Frequency Reuse (Ffr)mentioning

confidence: 95%

Enhanced bit error rate in visible light communication: a new LED hexagonal array distribution

et al. 2022

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Due to the exponential growth of mobile devices and wireless services, a huge demand for radio frequency has increased. The presence of several frequencies causes interference between cells, which must be minimized to get the lower bit error rate (BER). For this reason, it is of great interest to use visible light communication (VLC). This paper suggests a VLC system that decreases the BER with applying a new LED distribution with a hexagonal shape using different techniques: on–off keying (OOK), quadrature amplitude modulation, and frequency reuse concept to mitigate the interference between the reused frequencies inside the hexagonal shape. The BER is measured in two scenarios line of sight (LoS) and non-line of sight for each technique that we used. The recommended values of BER in the proposed model for soft frequency reuse in case of LoS at 4, 8, and 10 dB signal to noise ratio, are 3.6 × 10–6, 6.03 × 10–13, and 2.66 × 10–18, respectively.

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Position of light sources for VLC

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Látal

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et al. 2017

2017 19th International Conference on Transparent Optical Networks (ICTON)

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Software Design of SMD LEDs for Homogeneous Distribution of Irradiation in the Model of Dark Room

Cited by 4 publications

References 12 publications

Study of LED modulation effect on the photometric quantities and beam homogeneity of automotive lighting

Study of LED modulation effect on the photometric quantities and beam homogeneity of automotive lighting

Enhanced bit error rate in visible light communication: a new LED hexagonal array distribution

Position of light sources for VLC

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