Paper Info
Title
Adaptive predistortion technique for nonlinear LED with dimming control in VLC system
Abstract
Smart city planners pay more attention towards visible light communication (VLC) system to achieve seamless high speed connectivity. A light emitting diode (LED) acts as a transmitter in VLC system. However, the nonlinear characteristics and dimming nature of LED limits the performance of the VLC system by degrading the quality of transmitted signal. In this paper, we propose an adaptive-learning-architecture (ALA) based predistortion technique to estimate and compensate for LED nonlinearities as well as increase the spectral efficiency of a VLC system. A DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) signal is considered. The performance with and without predistorter is analysed assuming optical line-of-sight (LOS) 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, we investigate the impact of dimming on the performance of nonlinear LED in VLC system. Simulation results based on symbol error rate (SER), amplitude distortion (AM/AM) curves and constellation plots validate the performance of our proposed technique.
Year
DOI
Venue
2017
10.1109/ANTS.2017.8384165
2017 IEEE International Conference on Advanced Networks and Telecommunications Systems (ANTS)
Keywords
Field
DocType
DCO-OFDM,VLC system,LED nonlinearity,Adaptive learning architecture,Dimming control
Transmitter,Amplitude distortion,Computer science,Communication channel,Visible light communication,Electronic engineering,Spectral efficiency,Nonlinear distortion,Orthogonal frequency-division multiplexing,Predistortion
Conference
ISBN
Citations 
PageRank 
978-1-5386-2348-0
0
0.34
References 
Authors
11
4
Name
Order
Citations
PageRank
Aggarwal, Parag1156.16
Rizwana Ahmad201.35
Vivek Ashok Bohara310024.53
Anand Srivastava4109.92