Impact of Dynamic LED Non-Linearity on DCO-OFDM Optical Wireless Communication

DC-Offset Orthogonal Frequency Division Multiplexing (DCO-OFDM) is a popular modulation method for Optical Wireless Communication (OWC) as it can assign specific power levels and constellations to different subcarrier frequencies across the low-pass response of the LED. However, LEDs exhibit dynamic...

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Bibliographic Details
Published inIEEE communications letters Vol. 25; no. 10; pp. 3335 - 3339
Main Authors Linnartz, Jean-Paul M. G., Deng, Xiong, Van Voorthuisen, Paul
Format Journal Article
LanguageEnglish
Published New York IEEE 01.10.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Bandwidth
Constellations
Distortion
Light emitting diodes
Modulation
nonlinear channels
Nonlinear distortion
Nonlinearity
OFDM
Optical distortion
Optical wireless
Optical wireless communication (OWC)
Orthogonal Frequency Division Multiplexing
Photonics
Subcarriers
Wireless communication
Wireless communications
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Summary:DC-Offset Orthogonal Frequency Division Multiplexing (DCO-OFDM) is a popular modulation method for Optical Wireless Communication (OWC) as it can assign specific power levels and constellations to different subcarrier frequencies across the low-pass response of the LED. However, LEDs exhibit dynamic non-linearities to which OFDM is very sensitive. As LED signals are subject to non-linear memory effects in photon generation, different OFDM subcarriers experience different amounts of distortion. This letter translates the LED behavior into a communication channel model for OFDM modulation. It gives an experimentally verified expression for the Signal-to-Distortion Ratio (SDR) as it varies per subcarrier in OFDM systems.
Bibliography:ObjectType-Article-1
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ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2021.3102744