Title :
An advanced A-law companding algorithm in VLC-OFDM
Author :
Xiaojing Zhang ; Peng Liu ; Jiang Liu ; Song Liu
Author_Institution :
North China Electr. Power Univ., Beijing, China
Abstract :
In visible light communication (VLC) systems, the employing of orthogonal frequency division multiplexing (OFDM) may produce nonlinear distortion, due to the nonlinear characteristics of LEDs and the high peak to average power ratio (PAPR) of OFDM. Moreover, the clipping block deteriorates the distortion. In this paper, an advanced A-law algorithm for alleviating such distortion in VLC-OFDM systems is proposed. Simulation result shows that the BER of VLC-OFDM systems can be obviously reduced by employing the advanced A-law algorithm with suitable companding parameters, compared with the original VLC-OFDM process.
Keywords :
OFDM modulation; error statistics; light emitting diodes; nonlinear distortion; optical communication; BER reduction; LED nonlinear characteristics; PAPR; VLC-OFDM systems; advanced A-law companding algorithm; clipping block; nonlinear distortion; orthogonal frequency division multiplexing; peak-to-average power ratio; visible light communication systems; Bit error rate; Light emitting diodes; Modulation; Noise; Nonlinear distortion; Peak to average power ratio; nonlinear companding; nonlinear distortion; orthogonal frequency division multiplexing (OFDM); visible light communication (VLC);
Conference_Titel :
Consumer Electronics (GCCE), 2014 IEEE 3rd Global Conference on
Conference_Location :
Tokyo
DOI :
10.1109/GCCE.2014.7031221
