Performance Comparison of OFDM Signal and CAP Signal Over High Capacity RGB-LED-Based WDM Visible Light Communication

F. M. Wu; C. T. Lin; C. C. Wei; C. W. Chen; Z. Y. Chen; H. T. Huang; Sien Chi

doi:10.1109/JPHOT.2013.2271637

IEEE Photonics Journal (Jan 2013)

Performance Comparison of OFDM Signal and CAP Signal Over High Capacity RGB-LED-Based WDM Visible Light Communication

F. M. Wu,
C. T. Lin,
C. C. Wei,
C. W. Chen,
Z. Y. Chen,
H. T. Huang,
Sien Chi

Affiliations

F. M. Wu: <formula formulatype="inline"><tex Notation="TeX">$^{1}$</tex></formula>Institute of Photonic System, National Chiao Tung University, Tainan, Taiwan
C. T. Lin: Institute of Photonic System, National Chiao Tung University, Tainan , Taiwan
C. C. Wei: <formula formulatype="inline"><tex Notation="TeX">$^{2}$</tex></formula> Department of Photonics, National Sun Yat-sen University, Kaohsiung, Taiwan
C. W. Chen: Institute of Photonic System, National Chiao Tung University, Tainan , Taiwan
Z. Y. Chen: Department of Photonics, National Sun Yat-sen University, Kaohsiung , Taiwan
H. T. Huang: Institute of Photonic System, National Chiao Tung University, Tainan , Taiwan
Sien Chi: <formula formulatype="inline"><tex Notation="TeX">$^{3}$</tex></formula> Department of Photonics Engineering, Yuan Ze University, Taoyuan, Taiwan

DOI: https://doi.org/10.1109/JPHOT.2013.2271637
Journal volume & issue: Vol. 5, no. 4
pp. 7901507 – 7901507

Abstract

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We experimentally demonstrate a visible light communication (VLC) system based on a single commercially available RGB-type LED. High spectrally efficient carrierless amplitude and phase (CAP) modulation and orthogonal frequency-division multiplexing (OFDM) are adopted in the intensity-modulation and direct-detection VLC system of limited bandwidth. In order to achieve higher capacity of the uneven-frequency-response LED-based VLC system, OFDM signals are combined with the bit- and power-loading techniques, and CAP signals of various modulation are pre-emphasized to modulate one of the RGB chips. To reach the BER of less than 10-3, CAP and OFDM signals demonstrate the maximum data rates of 1.32 and 1.08 Gb/s, respectively, employing the blue chip. In addition to spectrally efficient formats, the wavelength-division-multiplexing (WDM) scheme is applied to further increase the capacity. After individually optimizing RGB chips, the maximum aggregate data rates of CAP and OFDM are 3.22 and 2.93 Gb/s, respectively, in our RGB-LED-based WDM VLC system. Hence, compared with OFDM, the CAP scheme shows competitive performance and provides an alternative spectrally efficient modulation for next generation optical wireless networks.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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