標題: Performance Comparison of OFDM Signal and CAP Signal Over High Capacity RGB-LED-Based WDM Visible Light Communication
作者: Wu, F. M.
Lin, C. T.
Wei, C. C.
Chen, C. W.
Chen, Z. Y.
Huang, H. T.
Chi, Sien
光電系統研究所
Institute of Photonic System
關鍵字: Visible light communication;carrier-less amplitude and phase modulation;wavelength-division-multiplexing
公開日期: 1-Aug-2013
摘要: We experimentally demonstrate a visible light communication (VLC) system based on a single commercially available RGB-type LED. High spectrally efficient carrier-less 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.
URI: http://dx.doi.org/10.1109/JPHOT.2013.2271637
http://hdl.handle.net/11536/22153
ISSN: 1943-0655
DOI: 10.1109/JPHOT.2013.2271637
期刊: IEEE PHOTONICS JOURNAL
Volume: 5
Issue: 4
結束頁: 
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