NDLI: LED non-linearity mitigation techniques for optical OFDM-based visible light communications

Content Provider	IET Digital Library
Author	Sheu, Jeng Shin Li, Bing Jia Lain, Jenn Kaie
Abstract	The visible light communication (VLC) utilising the light emitting diodes (LEDs) as transmitters has gained much interest for the indoor wireless access due to its abundance of unregulated spectrum. However, the LED non-linearities cause a detrimental non-linear distortion especially for the adoption of optical orthogonal frequency-division multiplexing (O-OFDM), which is known to suffer high peak-to-average power ratio (PAPR). Specifically, the authors consider the direct current biased O-OFDM (DCO-OFDM) to realise the O-OFDM signals. This study aims to develop the mitigation techniques for LED non-linearities at transmitter through the combined advantages of PAPR reduction and the technique of linearising the non-linear LED characteristics. The orthogonal cover code sequence is exploited to design a transform precoding to reduce the PAPR. An uncomplicated pre-distorter at transmitter is adopted to linearise the LED non-linearity. In addition, the authors propose a dynamic DC biasing method to avoid the clipping noise in DCO-OFDM. As a whole, the proposed techniques at VLC transmitter can improve the LED non-linearities even for large input signals.
Starting Page	259
Ending Page	264
Page Count	6
ISSN	17518768
Volume Number	11
e-ISSN	17518776
Issue Number	Issue 6, Dec (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-opt/11/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-opt.2017.0059
Journal	IET Optoelectronics
Publisher Date	2017-08-29
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Code Direct Current Biased O-OFDM Dynamic DC Biasing Method Free Space Optical Communication Free Space Optical Link Indoor Wireless Access LED Nonlinearity Mitigation Technique Light Emitting Diode Multiplexing And Switching in Optical Communication Nonlinear Distortion O-OFDM Signal OFDM Modulation Optical Communication Equipment Optical OFDM-based Visible Light Communication Optical Orthogonal Frequency-division Multiplexing Optical Transmitters Orthogonal Code Orthogonal Cover Code Sequence PAPR Reduction Peak-average Power Ratio Precoding Transform Coding Transform Precoding VLC Transmitter
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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