Jiaqi Zhao, Chaoyi Qin, Mengjie Zhang, Nan Chi, "Investigation on performance of special-shaped 8-quadrature amplitude modulation constellations applied in visible light communication," Photonics Res. 4, 249 (2016)
- Photonics Research
- Vol. 4, Issue 6, 249 (2016)
Fig. 1. 8-QAM constellation design.
Fig. 2. BER versus average SNR.
Fig. 3. Frequency response of a commercial LED.
Fig. 4. BER versus baud rate under high-frequency attenuation.
Fig. 5. U–I curve of the red chip of a commercial RGB–LED (LZ4-00MA00).
Fig. 6. CCDF of PAPRs for single-carrier, special-shaped 8-QAM signals.
Fig. 7. Experimental setup of single-carrier, special-shaped 8-QAM VLC system.
Fig. 8. BER versus different bias voltage and signal vpp for (a) circular (7,1), (b) circular (4,4), (c) rectangular, and (d) triangular.
Fig. 9. BER versus signal vpp (a) at bias voltage = 1.8 V voltage = 2.0 V voltage = 2.3 V
Fig. 10. Q
Fig. 11. Baud rate comparison for different 8-QAM constellations.
Fig. 12. Highest baud rate versus transmission for different 8-QAM.
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Table 1. Minimum Euclidean Distances of Special-Shaped 8-QAM Constellations
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Table 2. PAPRs of Different Special-Shaped 8-QAM Constellations
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Table 3. Dynamic Range of Signal VPP Under Different Bias Voltage
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