LED nonlinearity mitigation in LACO-OFDM optical communications based on adaptive predistortion and postdistortion techniques

The preinstalled white light emitting diodes (WLEDs) inside buildings can be exploited as an optical source in visible light communications (VLC) motivated by high optical efficiency and low cost. One of the main challenges for VLC is LED nonlinear distortion, which has a detrimental effect on syste...

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Bibliographic Details
Published in:Applied optics (2004) 2021-08, Vol.60 (24), p.7279
Main Authors: Abd Elkarim, Mohammed, Aly, Moustafa H., AbdelKader, Hala M., Elsherbini, M. M.
Format: Article
Language:English
Subjects:
Bit error rate
Compensation
Light emitting diodes
Nonlinearity
Optical communication
Orthogonal Frequency Division Multiplexing
Polynomials
Random noise
White light
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Summary:The preinstalled white light emitting diodes (WLEDs) inside buildings can be exploited as an optical source in visible light communications (VLC) motivated by high optical efficiency and low cost. One of the main challenges for VLC is LED nonlinear distortion, which has a detrimental effect on system performance. Estimation and compensation of the LED nonlinear behavior can be accomplished using predistortion or postdistortion techniques. Three compensation techniques are adopted to mitigate the effect of LED nonlinearity on layered asymmetrically clipped optical, orthogonal frequency division multiplexing. Their performance and efficiency are discussed and compared with the aid of error vector magnitude and bit error rate (BER) in an additive white Gaussian noise channel. The obtained results reveal that polynomial-based predistorters and postdistorters can overcome the LED nonlinear behavior with extra SNR of only 0.25 dB at BER of 1 0 − 3 . Furthermore, the look-up-table-based predistorter can provide the same BER with lower SNR penalty than the previous two systems.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.432364