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Utilization of Optical OFDM Modulation on Blue LED VLC Datacom Without Equalization for 4 m Wireless Link

Authors :
Yuan-Zeng Lin
Chien-Hung Yeh
Wen-Piao Lin
Chi-Wai Chow
Source :
Micromachines, Vol 15, Iss 11, p 1322 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

To achieve higher visible light communication (VLC) traffic capacity, using the wide bandwidth light-emitting diode (LED) and spectral efficiency modulation signal, is currently the most commonly used method. In this demonstration, we apply the orthogonal frequency division multiplexing quadrature amplitude modulation (OFDM-QAM) with bit- and power-loading algorithm on single blue LED to achieve >1 Gbit/s VLC capacity, when a 400 MHz bandwidth avalanche photodiode (APD)-based receiver (Rx) is exploited for decoding. Here, the higher sensitivity APD can be applied to compensate for the wireless VLC link length in the proposed LED VLC system, and due to the lower LED illumination (255 to 40 lux), is used for the indoor access network after passing the wireless link length of 1 to 4 m. As a result, using single blue LED can achieve 0.962 to 1.057 Gbit/s OFDM rate with available 400 MHz bandwidth APD in poorly illuminated condition indoors without applying analogy equalization.

Details

Language :
English
ISSN :
2072666X
Volume :
15
Issue :
11
Database :
Directory of Open Access Journals
Journal :
Micromachines
Publication Type :
Academic Journal
Accession number :
edsdoj.b5d8cf4de9644a67b8ac479f194e7f1f
Document Type :
article
Full Text :
https://doi.org/10.3390/mi15111322