Open AccessMultilevel modulation scheme using the overlapping of two light sources for visible light communication with mobile phone camera
Author(s) -
Jin Shi,
Jing He,
Rui Deng,
Yiran Wei,
Fengting Long,
Yun Cheng,
Lin Chen
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.015905
Subject(s) - visible light communication , demodulation , keying , computer science , modulation (music) , on off keying , optical wireless , electronic engineering , amplitude shift keying , cmos sensor , light emitting diode , cmos , signal (programming language) , wireless , phase shift keying , optics , computer hardware , telecommunications , bit error rate , physics , engineering , decoding methods , channel (broadcasting) , programming language , acoustics
Visible light communication (VLC) with light emitting diodes (LEDs) is an emerging technology for 5G wireless communications. Recently, using complementary metal-oxide-semiconductor (CMOS) image sensor as VLC receiver is developed owing to its flexibility and low-cost. However, two illumination levels such as on-off keying (OOK) signal are used. To improve the system throughput and reduce complexity of the hardware design, in this paper, we propose and experimentally demonstrate a multilevel modulation scheme for VLC system utilizing the overlapping of two light sources for the first time, and the two light sources are modulated by an OOK and a Manchester signal respectively. At the receiver, a CMOS camera can demodulate the Manchester and the OOK signal simultaneously. Meanwhile, a low-pass filter (LPF) is used to enhance the system performance. The experimental results demonstrate that the proposed multilevel modulation scheme can achieve a net data rate of 4.32 kbit/s.