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

fYear

2014

fDate

7-10 Oct. 2014

Firstpage

721

Lastpage

722

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);

fLanguage

English

Publisher

ieee

Conference_Titel

Consumer Electronics (GCCE), 2014 IEEE 3rd Global Conference on

Conference_Location

Tokyo

Type

conf

DOI

10.1109/GCCE.2014.7031221

Filename

7031221