Title :
Multi-LED Phase-Shifted OOK Modulation Based Visible Light Communication Systems
Author :
Dong-Fang Zhang ; Yi-Jun Zhu ; Yan-Yu Zhang
Author_Institution :
Zhengzhou Inf. Sci. & Technol. Inst., Zhengzhou, China
Abstract :
The limited modulation bandwidth and the non-linearity nature of LEDs are the key challenges to visible light communication. In general, one LED lamp consists of multiple LED chips. In this letter, these LED chips are used for parallel transmission though multi-LED phase-shifted OOK (MP-OOK) modulation. For MP-OOK, the bandwidth efficiency is approximate N times that of conventional OOK ( N is the number of LED chips). For each branch, the modulation format is OOK. Hence, MP-OOK has a better anti-nonlinearity performance than other high-order modulation formats, such as DC-biased optical orthogonal frequency-division multiplexing (DCO-OFDM). The simulation comparisons between MP-OOK and DCO-OFDM verify these.
Keywords :
OFDM modulation; amplitude shift keying; light emitting diodes; optical communication equipment; optical modulation; DC-biased optical orthogonal frequency-division multiplexing; DCO-OFDM; MP-OOK; OOK; bandwidth efficiency; high-order modulation formats; limited modulation bandwidth; multiLED phase-shifted OOK modulation; visible light communication systems; Bandwidth; High-speed optical techniques; Light emitting diodes; Modulation; OFDM; Receivers; Wireless communication; Light-emitting diode (LED); bandwidth efficiency; modulation bandwidth; multi-LED phase-shifted OOK (MP-OOK); nonlinearity; visible light communication (VLC);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2283583
