Paper Info
Title
Exploring multiamplitude voltage modulation to improve spectrum efficiency in low-complexity visible-light communication
Abstract
Owing to the recent advancements in the Internet of Things (IoT), an increasing number of IoT devices have led to frequency crowding in wireless networks. The low-complexity visible light communication (VLC) system is a promising solution for indoor frequency-crowded wireless networks owing to the ubiquity of light-emitting diodes (LEDs) and readily deployable, low-cost modulation methods. However, due to the inherent limitations of LED materials and growth of data from IoT applications, low-complexity VLC systems can barely boost the data throughput without adding complex modulations and circuits. This study aims to design and implement a spectrum-efficient, low-complexity VLC system to improve data throughput with very little cost to support indoor IoT applications. This system uses multiamplitude voltage to transmit multiple bit streams simultaneously, making it a novel system. However, it is not trivial to achieve this goal as the varying voltage can cause the LEDs to flicker. Therefore, we further propose a voltage-to-current amplifier circuit, which effectively mitigates the effects of changes in the LED’s brightness upon human eyes. Finally, we evaluate the system under different speeds, distances, and angles. Extensive experiments demonstrate promising results from the viewpoint of spectrum efficiency, throughput, bit-error rate, and user perception.
Year
DOI
Venue
2019
10.1007/s11432-018-9858-2
Science China Information Sciences
Keywords
DocType
Volume
visible light communication, amplitude modulation, spectral efficiency
Journal
62
Issue
ISSN
Citations 
8
1674-733X
0
PageRank 
References 
Authors
0.34
0
4
Name
Order
Citations
PageRank
Xiangyu Liu15114.10
Xuetao Wei231931.12
Lei Guo356482.56
Yejun Liu49018.35