Purposeful Suppression and Reconstruction of White Light from LED for Improvement of Communication Properties
Jan Vitasek, Jan Latal, Tomas Stratil, Stanislav Hejduk, Ales Vanderka, Lukas Hajek, Jakub Kolar
DOI: 10.15598/aeee.v17i1.2671
Abstract
Visible Light Communication (VLC) technology uses white Light Emitting Diodes (LED) for providing illumination and communication at the same time. White LEDs have excellent illumination properties but their communication properties need improvement. This article proposes a way how to evade the communication limitations of white LEDs. A part of original white LED spectrum is suppressed by an optical filter. Then the suppressed part is replaced by another LED. The correct choice of suitable LED enables to reconstruct the original spectrum. This solution removes the limitations because the white LED emits continuously. Data are carried by the communication LED only. The evaluation of reconstruction of original white light is measurement of the colour coordinates x and y. Furthermore, the communication properties of this transmitter were tested and obtained results are shown in this paper. EVM parameter was measured.