• Chinese Optics Letters
  • Vol. 13, Issue 7, 072302 (2015)
Ruqi Zhang, Jianfeng Li*, Zhitong Huang, and Yuefeng Ji
Author Affiliations
  • State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
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    DOI: 10.3788/COL201513.072302 Cite this Article Set citation alerts
    Ruqi Zhang, Jianfeng Li, Zhitong Huang, Yuefeng Ji, "Adaptive frequency domain pre-equalization for white-LED nonlinearity in OFDM-based visible light communication systems," Chin. Opt. Lett. 13, 072302 (2015) Copy Citation Text show less
    Measured optical power against LED current.
    Fig. 1. Measured optical power against LED current.
    SNR versus subcarrier frequency (LED channel response and channel pre-compensation).
    Fig. 2. SNR versus subcarrier frequency (LED channel response and channel pre-compensation).
    Measured output power spectrum: (a) 10 and (b) 50 MHz (sinusoidal signal of 1.1 V at the bias current of 100 mA).
    Fig. 3. Measured output power spectrum: (a) 10 and (b) 50 MHz (sinusoidal signal of 1.1 V at the bias current of 100 mA).
    Schematic of adaptive pre-compensation for our OFDM system. AMP, amplifier; LPF, low-pass filter; P/S, parallel to serial; S/P, serial to parallel.
    Fig. 4. Schematic of adaptive pre-compensation for our OFDM system. AMP, amplifier; LPF, low-pass filter; P/S, parallel to serial; S/P, serial to parallel.
    Experimental setup of LED communication.
    Fig. 5. Experimental setup of LED communication.
    Measured power spectrums of OFDM symbols: (a) without pre-equalization (driving signal from PA); (b) without pre-equalization (received signal from PD); (c) with pre-equalization (driving signal from PA); (d) with pre-equalization (received signal from PD).
    Fig. 6. Measured power spectrums of OFDM symbols: (a) without pre-equalization (driving signal from PA); (b) without pre-equalization (received signal from PD); (c) with pre-equalization (driving signal from PA); (d) with pre-equalization (received signal from PD).
    Measured BER versus bias current with pre-compensation.
    Fig. 7. Measured BER versus bias current with pre-compensation.
    BER versus the OFDM signal power with 32-QAM.
    Fig. 8. BER versus the OFDM signal power with 32-QAM.
    BER versus the OFDM signal power with 64-QAM.
    Fig. 9. BER versus the OFDM signal power with 64-QAM.
    Ruqi Zhang, Jianfeng Li, Zhitong Huang, Yuefeng Ji, "Adaptive frequency domain pre-equalization for white-LED nonlinearity in OFDM-based visible light communication systems," Chin. Opt. Lett. 13, 072302 (2015)
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