Adaptive learning architecture-based predistorter for nonlinear VLC system

A light-emitting diode (LED) acts as a transmitter in a visible-light communication (VLC) system. However, the nonlinear characteristics of LED limit the performance of the VLC system by degrading the quality of a transmitted signal. In recent years, several forms of predistorters have been proposed to mitigate the effects of LED nonlinearity; however, none of them have been able to approach the performance of a linear VLC system. In this paper, we propose an adaptive learning architecture (ALA)-based predistortion technique to estimate and compensate for LED nonlinearities in a VLC system. A DC-biased optical orthogonal frequency division multiplexing signal is considered. The performance with and without predistorter is analyzed assuming optical channel. It is shown that degradation due to LED nonlinearity can be compensated by using ALA-based predistortion, and the overall predistorter–LED system is able to approach near-linear performance. Further, the proposed predistorter architecture is also able to track the variations in LED nonlinearity and compensate them. Simulation results based on error vector magnitude, symbol error rate, amplitude distortion (AM/AM) curves and constellation plots validate the performance of our proposed technique.

[1]  Shlomi Arnon.  Visible Light Communication , 2015 .

[2]  Harald Haas,et al.  Visible light communication using OFDM , 2006, 2nd International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities, 2006. TRIDENTCOM 2006..

[3]  Harald Haas,et al.  OFDM Visible Light Wireless Communication Based on White LEDs , 2007, 2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring.

[4]  Rafael Perez-Jimenez,et al.  Adaptive OFDM system for communications over the indoor wireless optical channel , 2006 .

[5]  Harald Haas,et al.  A study of LED nonlinearity effects on optical wireless transmission using OFDM , 2009, 2009 IFIP International Conference on Wireless and Optical Communications Networks.

[6]  Parth H. Pathak,et al.  Visible Light Communication, Networking, and Sensing: A Survey, Potential and Challenges , 2015, IEEE Communications Surveys & Tutorials.

[7]  Dennis R. Morgan,et al.  A robust digital baseband predistorter constructed using memory polynomials , 2004, IEEE Transactions on Communications.

[8]  Harald Haas,et al.  Non-linearity effects and predistortion in optical OFDM wireless transmission using LEDs , 2009, Int. J. Ultra Wideband Commun. Syst..

[9]  S. Sinanovic,et al.  Complete Modeling of Nonlinear Distortion in OFDM-Based Optical Wireless Communication , 2013, Journal of Lightwave Technology.

[10]  Huaping Liu,et al.  Adaptive Modulation Schemes for Visible Light Communications , 2015, Journal of Lightwave Technology.

[11]  S. Dimitrov,et al.  Signal Shaping and Modulation for Optical Wireless Communication , 2012, Journal of Lightwave Technology.

[12]  Henrik Schulze,et al.  Frequency-Domain Simulation of the Indoor Wireless Optical Communication Channel , 2016, IEEE Transactions on Communications.

[13]  Steve Hranilovic.  On the design of bandwidth efficient signalling for indoor wireless optical channels , 2005, Int. J. Commun. Syst..

[14]  T. Lee.  The nonlinearity of double-heterostructure LED's for optical communications , 1977, Proceedings of the IEEE.

[15]  Harald Haas,et al.  Impact of LED nonlinearities on optical wireless OFDM systems , 2010, 21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.

[16]  H. Qian,et al.  Adaptive Postdistortion for Nonlinear LEDs in Visible Light Communications , 2014, IEEE Photonics Journal.

[17]  J. Armstrong,et al.  OFDM for Optical Communications , 2009, Journal of Lightwave Technology.

[18]  Vimal Bhatia,et al.  Precoded Chebyshev-NLMS-Based Pre-Distorter for Nonlinear LED Compensation in NOMA-VLC , 2017, IEEE Transactions on Communications.

[19]  Masao Nakagawa,et al.  Fundamental analysis for visible-light communication system using LED lights , 2004, IEEE Transactions on Consumer Electronics.

[20]  Anand Srivastava,et al.  Adaptive predistortion technique for nonlinear LED with dimming control in VLC system , 2017, 2017 IEEE International Conference on Advanced Networks and Telecommunications Systems (ANTS).

[21]  Sang Kyu Park,et al.  Adaptive predistorter using NLMS algorithm for nonlinear compensation in visible-light communication system , 2014 .

[22]  Robert J. Baxley,et al.  Nonlinear distortion mitigation in visible light communications , 2015, IEEE Wireless Communications.

[23]  Yudong Li,et al.  Tunable Resonances in the Plasmonic Split-Ring Resonator , 2014, IEEE Photonics Journal.

[24]  R.A. Shafik,et al.  On the Extended Relationships Among EVM, BER and SNR as Performance Metrics , 2006, 2006 International Conference on Electrical and Computer Engineering.

[25]  Rajendran Parthiban,et al.  LED Based Indoor Visible Light Communications: State of the Art , 2015, IEEE Communications Surveys & Tutorials.

[26]  Robert J. Baxley,et al.  EVM and achievable data rate analysis of clipped OFDM signals in visible light communication , 2012, EURASIP J. Wirel. Commun. Netw..

[27]  Harald Haas,et al.  Indoor optical wireless communication: potential and state-of-the-art , 2011, IEEE Communications Magazine.

[28]  Jean Armstrong,et al.  Comparison of Asymmetrically Clipped Optical OFDM and DC-Biased Optical OFDM in AWGN , 2008, IEEE Communications Letters.

[29]  Harald Haas,et al.  Predistortion in Optical Wireless Transmission Using OFDM , 2009, 2009 Ninth International Conference on Hybrid Intelligent Systems.

[30]  Masao Nakagawa,et al.  Performance evaluation of visible-light wireless communication system using white LED lightings , 2004, Proceedings. ISCC 2004. Ninth International Symposium on Computers And Communications (IEEE Cat. No.04TH8769).

[31]  A.M.J. Koonen,et al.  Impact of LED Nonlinearity on Discrete Multitone Modulation , 2009, IEEE/OSA Journal of Optical Communications and Networking.

[32]  B. Inan,et al.  Impact of Nonlinear LED Transfer Function on Discrete Multitone Modulation: Analytical Approach , 2009, Journal of Lightwave Technology.

[33]  Steve Hranilovic.  On the design of bandwidth efficient signalling for indoor wireless optical channels: Research Articles , 2005 .

[34]  Vimal Bhatia,et al.  Chebyshev Polynomial-Based Adaptive Predistorter for Nonlinear LED Compensation in VLC , 2016, IEEE Photonics Technology Letters.

[35]  Joseph M. Kahn,et al.  Comparison of Orthogonal Frequency-Division Multiplexing and Pulse-Amplitude Modulation in Indoor Optical Wireless Links , 2012, IEEE Transactions on Communications.

[36]  Jean Armstrong,et al.  Power efficient optical OFDM , 2006 .

[37]  H. Haas,et al.  LED nonlinearity mitigation techniques in optical wireless OFDM communication systems , 2012, IEEE/OSA Journal of Optical Communications and Networking.

[38]  Svilen Dimitrov,et al.  Clipping Noise in OFDM-Based Optical Wireless Communication Systems , 2012, IEEE Transactions on Communications.

[39]  Edward A. Lee,et al.  Simulation of Multipath Impulse Response for Indoor Wireless Optical Channels , 1993, IEEE J. Sel. Areas Commun..

[40]  Masao Nakagawa,et al.  Integrated system of white LED visible-light communication and power-line communication , 2002, The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.