Spatial ODAC performance for indoor environment

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F14%3APU111106" target="_blank" >RIV/00216305:26220/14:PU111106 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Spatial ODAC performance for indoor environment

Popis výsledku v původním jazyce

The optical digital to analog conversion (ODAC) concept was introduced as a method able to cope with light- emitting diodes (LED) non-linear characteristic and dimming constraints. The approach is similar to an electrical digital-to- analog converter (DAC), where several digital bit streams are weighted in order to represent an analog signal. This technique enables simple on-off modulation schemes, which are able to take full advantage of the LEDs non-linear characteristic and also allow pulse-width modulation (PWM) dimming to be em- ployed for combined lighting and communication means. Unlike electrical DACs, and ODAC has a reconstruction error that depends not only on the bit depth of the converter, but also on the system set-up. This paper presents simulation results able to show the reconstruction error performance as a function of space, luminaire placement, LEDs half power angle (HPA) and photo detector field of view (FOV). The set-up assumes multipath due to reflections and low bit rates. Important conclusions point out for necessary precautions concerning the LEDs and photo detectors characteristics, which are linked to the number of LED luminaires inside the room and the uniformity of the lighting conditions.

Název v anglickém jazyce

Spatial ODAC performance for indoor environment

Popis výsledku anglicky

The optical digital to analog conversion (ODAC) concept was introduced as a method able to cope with light- emitting diodes (LED) non-linear characteristic and dimming constraints. The approach is similar to an electrical digital-to- analog converter (DAC), where several digital bit streams are weighted in order to represent an analog signal. This technique enables simple on-off modulation schemes, which are able to take full advantage of the LEDs non-linear characteristic and also allow pulse-width modulation (PWM) dimming to be em- ployed for combined lighting and communication means. Unlike electrical DACs, and ODAC has a reconstruction error that depends not only on the bit depth of the converter, but also on the system set-up. This paper presents simulation results able to show the reconstruction error performance as a function of space, luminaire placement, LEDs half power angle (HPA) and photo detector field of view (FOV). The set-up assumes multipath due to reflections and low bit rates. Important conclusions point out for necessary precautions concerning the LEDs and photo detectors characteristics, which are linked to the number of LED luminaires inside the room and the uniformity of the lighting conditions.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

3rd International Workshop in Optical Wireless Communications (IWOW)

ISBN

978-1-4799-6676-9

ISSN

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e-ISSN

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Počet stran výsledku

5

Strana od-do

70-74

Název nakladatele

Neuveden

Místo vydání

Funchal, Madeira Island, Portugal

Místo konání akce

Madeira Island

Datum konání akce

17. 9. 2014

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000454640800015