Brightness Control in Dynamic Range Constrained Visible Light OFDM Systems

Visible light communication (VLC) systems can provide illumination and communication simultaneously via light emitting diodes (LEDs). Orthogonal frequency division multiplexing (OFDM) waveforms transmitted in a VLC system will have high peak-to-average power ratios (PAPRs). Since the transmitting LE...

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Bibliographic Details
Published in:arXiv.org 2014-01
Main Authors: Z Yu, Baxley, R J, Zhou, G T
Format: Article
Language:English
Subjects:
Brightness
Cycle ratio
Dynamic range
Illumination
Light emitting diodes
Nonlinear control
Optical communication
Organic light emitting diodes
Orthogonal Frequency Division Multiplexing
Pulse duration modulation
Waveforms
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Summary:Visible light communication (VLC) systems can provide illumination and communication simultaneously via light emitting diodes (LEDs). Orthogonal frequency division multiplexing (OFDM) waveforms transmitted in a VLC system will have high peak-to-average power ratios (PAPRs). Since the transmitting LED is dynamic-range limited, OFDM signal has to be scaled and biased to avoid nonlinear distortion. Brightness control is an essential feature for the illumination function. In this paper, we will analyze the performance of dynamic range constrained visible light OFDM systems with biasing adjustment and pulse width modulation (PWM) methods. We will investigate the trade-off between duty cycle and forward ratio of PWM and find the optimum forward ratio to maximize the achievable ergodic rates.
ISSN:2331-8422
DOI:10.48550/arxiv.1304.0193