Nonlinear distortion mitigation in visible light communications

Ying, Kai; Yu, Zhenhua; Baxley, Robert J.; Qian, Hua; Chang, Gee‐Kung; Zhou, Guoyun

doi:10.1109/mwc.2015.7096283

Cited by 149 publications

(52 citation statements)

References 17 publications

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“…The impact of nonlinearity is more severe for high-order sub-carrier modulation based OFDM due to its high peakto-average power ratio [20]. Hence, valuable research has been dedicated to treating the nonlinearity of LEDs, such as limiting the peak-to-peak input signal range [218], [219], using pre-distortion [220], post-distortion [221], [222] or nonlinear equalisers [223], etc. All in all, it is an exciting era for VLC researchers.…”

Section: ) Led Limitationsmentioning

confidence: 99%

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Zhang

Hanzo

2018

IEEE Commun. Surv. Tutorials

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Abstract-In order to counteract the explosive escalation of wireless tele-traffic, the communication spectrum has been gradually expanded from the conventional radio frequency (RF) band to the optical wireless (OW) domain. By integrating the classic RF band relying on diverse radio techniques and optical bands, the next-generation heterogeneous networks (HetNets) are expected to offer a potential solution for supporting the ever-increasing wireless tele-traffic. Owing to its abundant unlicensed spectral resources, visible light communications (VLC) combined with advanced illumination constitute a competent candidate for complementing the existing RF networks. Although the advantages of VLC are multi-fold, some challenges arise when incorporating VLC into the classic RF HetNet environments, which may require new system architectures. The user-centric (UC) design principle for VLC environments constitutes a novel and competitive design paradigm for the super dense multi-tier cell combinations of HetNets. The UC concept may be expected to become one of the disruptive techniques to be used in the forthcoming fifthgeneration era. This paper provides a comprehensive survey of visible-light-aided OW systems with special emphasis on the design and optimization of VLC networks, where the radically new UC design philosophy is reviewed. Finally, design guidelines are provided for VLC systems.

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Section: ) Led Limitationsmentioning

confidence: 99%

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Zhang

Hanzo

2018

IEEE Commun. Surv. Tutorials

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“…Since LED is driven by the positive electronic signal, DC bias B DC should be added to x. Considering the nonlinear LED transfer characteristic, x + B DC is clipped beyond the LED dynamic region of [A min , A max ] [13]. The transmitted DCO-OFDM signals x DCO could be expressed as…”

Section: System Modelmentioning

confidence: 99%

BICM-ID scheme for clipped DCO-OFDM in visible light communications

Tan¹,

Hanzo²,

Wang³

et al. 2016

Opt. Express

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Abstract:Visible light communication (VLC) is recommended for indoor transmissions in 5G network, whereby DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) is adopted to eliminate the inter-symbol interference (ISI) but suffers from considerable performance loss induced by clipping distortion. In this paper, bit-interleaved coded modulation with iterative demapping and decoding (BICM-ID) scheme for clipped DCO-OFDM is investigated to enhance the performance of VLC systems. In order to further mitigate the clipping distortions, a novel soft demapping criterion is proposed, and a simplified demapping algorithm is developed to reduce the complexity of the proposed criterion. Simulation results illustrate that the enhanced demapping algorithm achieves a significant performance gain. 1971-1978 (2015). 9. T. Mao, Z. Wang, Q. Wang, and L. Dai, "Ellipse-based DCO-OFDM for visible light communications," Opt.Commun. 360, 1-6 (2016). 10. Z. Wang, Q. Wang, S. Chen and L. Hanzo, "An adaptive scaling and biasing scheme for OFDM-based visible light communication systems," Opt. Express 22(10), 12707-12715 (2014). 11. J. Tan, Z. Wang, Q. Wang, and L. Dai, "Near-optimal low-complexity sequence detection for clipped DCO-OFDM," IEEE Photon. Technol. Lett 28(3), 233-236 (2016). 12. S. ten Brink, J. Speidel, and R. H. Yan, "Iterative demapping and decoding for multilevel modulation," in Proc.Globecom. 579-584 (1998 36-45 (2015). 14. P. Robertson, E. Villebrun, and P. Hoeher, "A comparison of optimal and sub-optimal MAP decoding algorithms operating in the log domain," in Proc. ICC, 1009ICC, -1013ICC, (1995. 15. J. Tan, Z. Wang, C. Qian, Z. Wang, S. Chen, and L. Hanzo, "A reduced-complexity demapping algorithm for BICM-ID systems," IEEE Trans. Veh. Technol. 64(9), 4350-4356 (2015). 16. S. ten Brink, "Convergence behavior of iteratively decoded parallel concatenated codes," IEEE Trans. Commun.

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“…The nonlinear behavior of LED imposes amplitude distortion on the input signals. The lower peaks of signals are clipped at the LED turn-on voltage (TOV), and the upper peaks are saturated at the maximum allowable voltage recommended by the manufacturer [8].…”

Section: Introductionmentioning

confidence: 99%

Extreme-Learning-Machine-Based Noniterative and Iterative Nonlinearity Mitigation for LED Communication Systems

Gao

Guo

Tong

et al. 2020

IEEE Systems Journal

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This work concerns receiver design for light emitting diode (LED) communications where the LED nonlinearity can severely degrade the performance of communications. We propose extreme learning machine (ELM) based non-iterative receivers and iterative receivers to effectively handle the LED nonlinearity and memory effects. For the iterative receiver design, we also develop a data-aided receiver, where data is used as virtual training sequence in ELM training. It is shown that the ELM based receivers significantly outperform conventional polynomial based receivers; iterative receivers can achieve huge performance gain compared to non-iterative receivers; and the data-aided receiver can reduce training overhead considerably. This work can also be extended to radio frequency communications, e.g., to deal with the nonlinearity of power amplifiers.

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Nonlinear distortion mitigation in visible light communications

Cited by 149 publications

References 17 publications

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

BICM-ID scheme for clipped DCO-OFDM in visible light communications

Extreme-Learning-Machine-Based Noniterative and Iterative Nonlinearity Mitigation for LED Communication Systems

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