Open AccessAdaptive predistorter using NLMS algorithm for nonlinear compensation in visible‐light communication system
Author(s) -
Kim Jin Kwan,
Hyun Kwangmin,
Park Sang Kyu
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.1835
Subject(s) - compensation (psychology) , nonlinear system , control theory (sociology) , computer science , algorithm , communications system , optical communication , adaptive filter , electronic engineering , telecommunications , engineering , physics , artificial intelligence , psychology , control (management) , quantum mechanics , psychoanalysis
A predistortion method using the adaptive normalised least mean square (NLMS) algorithm is proposed for the estimation of light‐emitting diode distortion. The light emission characteristic could change nonlinearly depending on conditions of the physical environment, such as temperature variation, which cannot be ignored, especially in the case of high‐power emissions. Instead of using the fixed values of the conventional memory look‐up‐table (LUT) for nonlinearity compensation, the proposed adaptive NLMS‐based predistorter immediately estimates the distortion change according to environmental changes. The simulation results show that the proposed method has better performance than the conventional predistorter employing an LUT.