Constellation Collaborated OFDM for Visible Light Communication Systems

Author

Dong-Fang Zhang ; Yi-Jun Zhu ; Jian-Kang Zhang ; Yan-Yu Zhang

Author_Institution

Dept. of Commun. Eng., Zhengzhou Inf. Sci. & Technol. Inst., Zhengzhou, China

Volume

18

Issue

6

fYear

2014

fDate

Jun-14

Firstpage

1067

Lastpage

1070

Abstract

In visible light communication (VLC) systems based on LEDs, the limited modulation bandwidth of LEDs is a major challenge in achieving high-speed data transmission. To attain better performance on the low-pass frequency-selective fading channel, a constellation collaborated orthogonal frequency amplitude multiplexing (OFDM) is proposed in this letter. In this novel OFDM, each two subcarrier frequencies are chosen as a pair. The symbols on the two subcarrier frequencies are respectively chosen from two uniquely factorable constellation pairs (UFCPs), with one random bit acting as a coordinator to control the two symbols. Simulation comparisons demonstrate that the proposed constellation collaborative OFDM systems can attain 0.8-1.5 dB SNR gain over conventional OFDM systems.

Keywords

OFDM modulation; fading channels; light emitting diodes; optical communication; optical modulation; LED; UFCP; VLC; constellation collaborated OFDM systems; gain 0.8 dB to 1.5 dB; high-speed data transmission; light emitting diodes; low-pass frequency-selective fading channel; uniquely factorable constellation pairs; visible light communication systems; Bandwidth; Light emitting diodes; Noise measurement; OFDM; Optical modulation; Quadrature amplitude modulation; Visible light communication (VLC); constellation collaborated orthogonal frequency division multiplexing (OFDM); low-pass frequency-selective fading channel; modulation bandwidth; uniquely factorable constellation pairs (UFCPs);

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2014.2318318

Filename

6802364