Visible light communication (VLC) is a promising technology that complements existing wireless communication networks to provide high-speed, low-latency, and multi-device access. With the high-performance code modulation technology of traditional wireless communication, various physical layer communication technologies adapted to VLC systems have been designed and implemented. Different from traditional radio frequency (RF) communication, VLC uses LED as the signal source. The modulation of LED is easy to produce nonlinear distortion and the modulation bandwidth is limited. It has become the technical bottleneck of VLC high-speed communication. In view of the challenges of these two aspects, taking white LED as the starting point, this paper expounds that white LED can effectively balance the characteristics of illumination and communication, summarizes and classifies various techniques of nonlinear distortion compensation and extended modulation bandwidth. Finally, this paper proposes open research issues such as LED package materials and processes, new Micro-LED device research, light source layout design, and intercode interference cancellation technology are expected to improve the performance of visible light communication systems.
LED nonlinearity compensation and bandwidth expansion techniques in visible light communication
First published at:Mar 18, 2020
 Shiu Y S, Chang S Y, Wu H C, et al. Physical layer security in wireless networks: a tutorial[J]. IEEE Wireless Communications, 2011, 18(2): 66–74.
 Liu J, Sando J, Li W, et al. Long distance optical Wireless network employing multiple access scheme[C]//Proceedings of 2007 IEEE Global Telecommunications Conference, Washington, DC, USA, 2007: 2258–2262.
 Green R J, Joshi H, Higgins M D, et al. Recent developments in indoor optical wireless systems[J]. IET Communications, 2008, 2(1): 3–10.
 Singh S, Kakamanshadi G, Gupta S. Visible light communic-ationan emerging wireless communication technology[C]//Pro-ceedings of the 2015 2nd International Conference on Rece-nt Advances in Engineering & Computational Sciences, Ch-andigarh, 2015: 1–3.
 Kottke C, Habel K, Grobe L, et al. Single-channel wireless transmission at 806 Mbit/s using a white-light LED and a PIN-based receiver[C]//Proceedings of the 2012 14th International Conference on Transparent Optical Networks, Coventry, UK, 2012: 1–4.
 Zhu X, Wang F M, Shi M, et al. 10.72Gb/s visible light co-mmunication system based on single packaged RGBYC LE-D utilizing QAM-DMT modulation with hardware pre-equaliza-tion[C]//Proceedings of Optical Fiber Communication Confer-ence 2018, San Diego, 2018: 11–15.
 Pathak P H, Feng X T, Hu P F, et al. Visible light communication, networking, and sensing: a survey, potential and challenges[J]. IEEE Communications Surveys & Tutorials, 2015, 17(4): 2047–2077.
 Dimitrov S, Haas H. Information rate of OFDM-based optical wireless communication systems with nonlinear distortion[J]. Journal of Lightwave Technology, 2013, 31(6): 918–929.
 Zhao S, Cai S Z, Kang K, et al. Optimal transmission power in a nonlinear VLC system[C]//Proceedings of 2015 IEEE Global Conference on Signal and Information Processing, Orlando, 2015: 1180–1184.
 Wang C, Zhou Y J, Chi N. Research of LED’s nonlinear distortion compensation algorithm in visible light communications[J]. China Light & Lighting, 2017(7): 9–15, 26.
王灿, 周盈君, 迟楠. 可见光通信中抗非线性方法的比较研究[J]. 中国照明电器, 2017(7): 9–15, 26.
 Elgala H, Mesleh R, Haas H. Non-linearity effects and predistortion in optical OFDM wireless transmission using LEDs[J]. International Journal of Ultra Wideband Communica-tions and Systems (IJUWBCS), 2009, 1(2): 143–150.
 Ying K, Yu Z H, Baxley R J, et al. Nonlinear distortion mitigation in visible light communications[J]. IEEE Wireless Communica-tions, 2015, 22(2): 36–45.
 Chi N, Zhou Y J, Zhao J Q, et al. High speed visible light communication based on hardware preequalization circuit[J]. Science & Technology Review, 2016, 34(16): 144–149.
迟楠, 周盈君, 赵嘉琦, 等. 基于硬件预均衡电路的高速可见光通信系统[J]. 科技导报, 2016, 34(16): 144–149.
 Chi N. Key Devices and Applications of LED Visible Light Communication[M]. Beijing: Post & Telecom Press, 2015: 8.
迟楠. LED可见光通信关键器件与应用[M]. 北京: 人民邮电出版社, 2015: 8.
 Steigerwald D A, Bhat J C, Collins D, et al. Illumination with solid state lighting technology[J]. IEEE Journal of Selected Topics in Quantum Electronics, 2002, 8(2): 310–320.
 Karunatilaka D, Zafar F, Kalavally V, et al. LED based indoor visible light communications: state of the art[J]. IEEE Commu-nications Surveys & Tutorials, 2015, 17(3): 1649–1678.
 Neokosmidis I, Kamalakis T, Walewski J W, et al. Impact of nonlinear LED transfer function on discrete multitone modulation: analytical approach[J]. Journal of Lightwave Technology, 2009, 27(22): 4970–4978.
 Tsonev D, Sinanovic S, Haas H. Complete modeling of nonlinear distortion in OFDM-based optical wireless communication[J]. Journal of Lightwave Technology, 2013, 31(18): 3064–3076.
 Ghassemlooy Z, Alves L N, Zvanovec S, et al. Visible Light Communications: Theory and Applications[M]. Boca Raton: CRC Press, 2017.
 Jiang F Y, Zhang J L, Xu L Q, et al. Efficient InGaN-based yellow-light-emitting diodes[J]. Photonics Research, 2019, 7(2): 144–148.
 Liu J L, Mo C L, Zhang J L, et al. Progress of five primary colours LED lighting source technology[J]. China Illuminating Engineering Journal, 2017, 28(1): 1–4, 29.
刘军林, 莫春兰, 张建立, 等. 五基色LED照明光源技术进展[J]. 照明工程学报, 2017, 28(1): 1–4, 29.
 Kamalakis T, Walewski J W, Ntogari G, et al. Empirical volterra-series modeling of commercial light-emitting diodes[J]. Journal of Lightwave Technology, 2011, 29(14): 2146–2155.
 Asatani K, Kimura T. Linearization of LED nonlinearity by predistortions[J]. IEEE Transactions on Electron Devices, 1978, 25(2): 207–212.
 Yao S J, Xu H Y, Wang L Y, et al. Research of adaptive predistortion technique for nonlinear LEDs with memory ef-fects[J]. Chinese Journal of Lasers, 2014, 41(11): 1105007.
姚赛杰, 徐浩煜, 汪亮友, 等. LED记忆非线性自适应预失真技术研究[J]. 中国激光, 2014, 41(11): 1105007.
 Kim J K, Hyun K, Park S K. Adaptive predistorter using NLMS algorithm for nonlinear compensation in visible-light communi-cation system[J]. Electronics Letters, 2014, 50(20): 1457–1459.
 Mitra R, Bhatia V. Chebyshev polynomial-based adaptive predistorter for nonlinear LED compensation in VLC[J]. IEEE Photonics Technology Letters, 2016, 28(10): 1053–1056.
 Lu X Y, Zhao M M, Qiao L, et al. Non-linear compensation of multi-CAP VLC system employing pre-distortion base on clus-tering of machine learning[C]//Proceedings of Optical Fiber Communication Conference 2018, San Diego, 2018: 11.
 Stepniak G, Siuzdak J, Zwierko P. Compensation of a VLC phosphorescent white LED nonlinearity by means of volterra DFE[J]. IEEE Photonics Technology Letters, 2013, 25(16): 1597–1600.
 Qian H, Yao S J, Cai S Z, et al. Adaptive postdistortion for nonlinear LEDs in visible light communications[J]. IEEE Photonics Journal, 2014, 6(4): 7901508.
 Mitra R, Bhatia V. Adaptive sparse dictionary-based kernel minimum symbol error rate post-distortion for nonlinear LEDs in visible light communications[J]. IEEE Photonics Journal, 2016, 8(4): 7905413.
 Wang Y Q, Huang X X, Zhang J W, et al. Enhanced performance of visible light communication employing 512-QAM N-SC-FDE and DD-LMS[J]. Optics Express, 2014, 22(13): 15328–15334.
 Xu X D. Nonlinear post-distortion for LED in visible light com-munication[J]. Network and Communication, 2017, 36(22): 78–82, 90.
徐旭东. 可见光通信中LED的非线性后失真补偿技术研究[J]. 微型机与应用, 2017, 36(22): 78–82, 90.
 Grubor J, Randel S, Langer K D, et al. Broadband information broadcasting using LED-based interior lighting[J]. Journal of Lightwave Technology, 2008, 26(24): 3883–3892.
 Le Minh H, O’Brien D, Faulkner G, et al. High-speed visible light communications using multiple-resonant equalization[J]. IEEE Photonics Technology Letters, 2008, 20(14): 1243–1245.
 Le Minh H, O’Brien D, Faulkner G, et al. 80 Mbit/s Visible Light Communications using pre-equalized white LED[C]//Pro-ceedings of the 2008 34th European Conference on Optica-l Communication, Brussels, 2008: 1–2.
 Li H L, Chen X B, Guo J Q, et al. 200 Mb/s visible optical wireless transmission based on NRZ-OOK modulation of phosphorescent white LED and a pre-emphasis circuit[J]. Chinese Optics Letters, 2014, 12(10): 100604.
 Fujimoto N, Yamamoto S. The fastest visible light transmissions of 662 Mb/s by a blue LED, 600 Mb/s by a red LED, and 520 Mb/s by a green LED based on simple OOK-NRZ modulation of a commercially available RGB-type white LED using pre-emphasis and post-equalizing techniques[C]//Proceedings of the 2014 the European Conference on Optical Communication, Cannes, France, 2014: 1–3.
 Yeh C H, Chow C W, Chen H Y, et al. Adaptive 84.44–190 Mbit/s Phosphor-LED Wireless Communication utilizing no blue filter at practical transmission distance[J]. Optics Express, 2014, 22(8): 9783–9788.
 Fujimoto N, Mochizuki H. 477 Mbit/s visible light transmission based on OOK-NRZ modulation using a single commercially available visible LED and a practical LED driver with a pre-emphasis circuit[C]//Proceedings of 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, Anaheim, 2013: 1–3.
 Li H L, Chen X B, Guo J Q, et al. An analog modulator for 460 MB/S visible light data transmission based on OOK-NRS modulation[J]. IEEE Wireless Communications, 2015, 22(2): 68–73.
 Huang X X, Shi J Y, Li J H, et al. 750Mbit/s visible light communications employing 64QAM-OFDM based on amplitude equalization circuit[C]//Proceedings of 2015 Optical Fiber Communications Conference and Exhibition, Los Angeles, 2015.
 Huang X X, Wang Z X, Shi J Y, et al. 1.6 Gbit/s phosphorescent white LED based VLC transmission using a cascaded pre-equalization circuit and a differential outputs PIN receiver[J]. Optics Express, 2015, 23(17): 22034–22042.
 Zhou Y J, Liang S Y, Chen S Y, et al. 2.08 Gbit/s visible light communication utilizing power exponential pre-equalization[C]//Proceedings of the 2016 25th Wireless and Optical Communication Conference, Chengdu, China, 2016.
 Grubor J, Lee S C J, Langer K D, et al. Wireless high-speed data transmission with phosphorescent white-light LEDs[C]//Proceedings of the 33rd European Conference and Exhibition of Optical Communication - Post-Deadline Papers, Berlin, Germany, 2007: 1–2.
 Le Minh H, O'Brien D, Faulkner G, et al. 100-Mb/s NRZ visible light communications using a postequalized white LED[J]. IEEE Photonics Technology Letters, 2009, 21(15): 1063–1065.
 Tokgoz S C, Anous N, Yarkan S, et al. Performance improve-ment of white LED-based VLC systems using blue and flattening filters[C]//Proceedings of 2019 International Conference on Advanced Communication Technologies and Networking, Rabat, Morocco, 2019: 1–6.
 Li H L, Chen X B, Huang B J, et al. High bandwidth visible light communications based on a post-equalization circuit[J]. IEEE Photonics Technology Letters, 2014, 26(2): 119–122.
 Ding D Q, Ke X Z, Li J X. Design and simulation on the layout of lighting for VLC system[J]. Opto-Electronic Engineering, 2007, 34(1): 131–134.
丁德强, 柯熙政, 李建勋. VLC系统的光源布局设计与仿真研究[J]. 光电工程, 2007, 34(1): 131–134.
 Komine T, Lee J H, Haruyama S, et al. Adaptive equalization system for visible light wireless communication utilizing multiple white LED lighting equipment[J]. IEEE Transactions on Wireless Communications, 2009, 8(6): 2892–2900.
 Li G Q, Hu F C, Zhao Y H, et al. Enhanced performance of a phosphorescent white LED CAP 64QAM VLC system utilizing deep neural network (DNN) post equalization[C]//Proceedings of 2019 IEEE/CIC International Conference on Communica-tions in China, Changchun, China, 2019.
National Natural Science Foundation of China (61661028), Major Projects of The Ministry of Science and Technology (2018YF1404300), and Provincial Youth Fund Major Project (20152ACB21008)
Get Citation: Wang Yuhao, Cao Fan, Deng Zhenyu, et al. LED nonlinearity compensation and bandwidth expansion techniques in visible light communication[J]. Opto-Electronic Engineering, 2020, 47(3): 190671.
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