Investigation on performance of special-shaped 8-quadrature amplitude modulation constellations applied in visible light communication

Jiaqi Zhao; Chaoyi Qin; Mengjie Zhang; Nan Chi

doi:10.1364/PRJ.4.000249

Photonics Research, Volume. 4, Issue 6, 249(2016)

Investigation on performance of special-shaped 8-quadrature amplitude modulation constellations applied in visible light communication

Jiaqi Zhao, Chaoyi Qin, Mengjie Zhang, and Nan Chi^*

Author Affiliations

Key Laboratory for Information Science of Electromagnetic Waves (MoE), Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China

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Figures & Tables(15)

Fig. 1. 8-QAM constellation design.

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Fig. 2. BER versus average SNR.

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Fig. 3. Frequency response of a commercial LED.

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Fig. 4. BER versus baud rate under high-frequency attenuation.

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Fig. 5. U–I curve of the red chip of a commercial RGB–LED (LZ4-00MA00).

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Fig. 6. CCDF of PAPRs for single-carrier, special-shaped 8-QAM signals.

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Fig. 7. Experimental setup of single-carrier, special-shaped 8-QAM VLC system.

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Fig. 8. BER versus different bias voltage and signal vpp for (a) circular (7,1), (b) circular (4,4), (c) rectangular, and (d) triangular.

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Fig. 9. BER versus signal vpp (a) at bias voltage=1.8 V, (b) at bias voltage=2.0 V, and (c) at bias voltage=2.3 V.

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Fig. 10. Q-factor comparison for different 8-QAM constellations.

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Fig. 11. Baud rate comparison for different 8-QAM constellations.

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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 1. Minimum Euclidean Distances of Special-Shaped 8-QAM Constellations
Constellation Min_Euclidean
Circular (7,1) 0.9277
Circular (4,4) 0.9194
Rectangular 0.8165
Triangular 0.8729

Table 2. PAPRs of Different Special-Shaped 8-QAM Constellations
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Table 2. PAPRs of Different Special-Shaped 8-QAM Constellations
Constellation PAPR
Circular (7,1) 1.1429
Circular (4,4) 1.5774
Rectangular 1.3333
Triangular 1.5238

Table 3. Dynamic Range of Signal VPP Under Different Bias Voltage

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Table 3. Dynamic Range of Signal VPP Under Different Bias Voltage

Constellation	Circular (7,1)		Circular (4,4)
Dynamic range	$V_Bias = 1.8 V$	0.40 V (0.30 V–0.70 V)	$V_Bias = 1.8 V$	0.14 V (0.48 V–0.62 V)
	$V_Bias = 2.0 V$	0.60 V (0.22 V–0.82 V)	$V_Bias = 2.0 V$	0.46 V (0.32 V–0.78 V)
	$V_Bias = 2.3 V$	0.37 V (0.41 V–0.78 V)	$V_Bias = 2.3 V$	0.12 V (0.48 V–0.60 V)
Constellation	Rectangular		Triangular
Dynamic range	$V_Bias = 1.8 V$	0.22 V (0.48 V–0.70 V)	$V_Bias = 1.8 V$	0.23 V (0.4 V–0.63 V)
	$V_Bias = 2.0 V$	0.48 V (0.32 V–0.8 V)	$V_Bias = 2.0 V$	0.46 V (0.32 V–0.78 V)
	$V_Bias = 2.3 V$	0.34 V (0.45 V–0.79 V)	$V_Bias = 2.3 V$	0.34 V (0.48 V–0.82 V)

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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)

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