Compensation of a VLC Phosphorescent White LED Nonlinearity by Means of Volterra DFE

In this letter, a visible light communication link is analyzed that employs a white phosphorescent light emitting diode (LED) as transmitter and a p-i-n photodiode combined with optical filter as receiver. Four- and eight-level pulse amplitude modulation is used for data transmission. The link is no...

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Bibliographic Details
Published in:IEEE photonics technology letters 2013-08, Vol.25 (16), p.1597-1600
Main Authors: Stepniak, Grzegorz, Siuzdak, Jerzy, Zwierko, Piotr
Format: Article
Language:English
Subjects:
Adaptive optics
Decision feedback equalizers
light emitting diode
Light emitting diodes
Modulation
Nonlinear optics
Optical filters
Visible light communications
volterra series
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Summary:In this letter, a visible light communication link is analyzed that employs a white phosphorescent light emitting diode (LED) as transmitter and a p-i-n photodiode combined with optical filter as receiver. Four- and eight-level pulse amplitude modulation is used for data transmission. The link is not only limited by a rather small bandwidth of ~20 MHz of the LED, but also its nonlinearity becomes a problem when the modulation index exceeds ~60%. It is shown that a receiver with a decision feedback equalizer (DFE) with nonlinear Volterra feed-forward section up to the second order can efficiently compensate effects of nonlinearity of the transmitting LED and performs up to 5 dB better in terms of optical power than using a standard DFE.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2013.2272511