Publication detail

Spatial ODAC performance for indoor environment

DOBESCH, A. ALVES, L. WILFERT, O.

Original Title

Spatial ODAC performance for indoor environment

Type

conference paper

Language

English

Original Abstract

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.

Keywords

Light Emitting Diode, Visible Light Communications, Optical Digital to Analog Conversion

Authors

DOBESCH, A.; ALVES, L.; WILFERT, O.

RIV year

2014

Released

17. 9. 2014

Location

Funchal, Madeira Island, Portugal

ISBN

978-1-4799-6676-9

Book

3rd International Workshop in Optical Wireless Communications (IWOW)

Pages from

70

Pages to

74

Pages count

5

BibTex

@inproceedings{BUT110350,
  author="Aleš {Dobesch} and Luis Nero {Alves} and Otakar {Wilfert}",
  title="Spatial ODAC performance for indoor environment",
  booktitle="3rd International Workshop in Optical Wireless Communications (IWOW)",
  year="2014",
  pages="70--74",
  address="Funchal, Madeira Island, Portugal",
  isbn="978-1-4799-6676-9"
}