Ruqi Zhang, Jianfeng Li, Zhitong Huang, Yuefeng Ji. Adaptive frequency domain pre-equalization for white-LED nonlinearity in OFDM-based visible light communication systems[J]. Chinese Optics Letters, 2015, 13(7): 072302
- Chinese Optics Letters
- Vol. 13, Issue 7, 072302 (2015)
Fig. 1. Measured optical power against LED current.
Fig. 2. SNR versus subcarrier frequency (LED channel response and channel pre-compensation).
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).
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.
Fig. 5. Experimental setup of LED communication.
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).
Fig. 7. Measured BER versus bias current with pre-compensation.
Fig. 8. BER versus the OFDM signal power with 32-QAM.
Fig. 9. BER versus the OFDM signal power with 64-QAM.
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