Optimization of Indoor VLC Coverage Uniformity by Improved Genetic Simulated Annealing Algorithm

Fig. 4. Received optical power distributions before and after optimization under rectangular layout. (a) Without optimization algorithm; (b) SAA (c) GSAA; (d) IGSAA

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Fig. 5. Received optical power distributions before and after optimization under mixed layout. (a) Without optimization algorithm; (b) SAA; (c) GSAA; (d) IGSAA

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Table 1. Default parameters for simulation

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Table 1. Default parameters for simulation

Symbol	Meaning	Value	Symbol	Meaning	Value
L×W×H	Room size /(m×m×m)	5×5×3	T_s0	Gain of optical filter	1
FOV	Transmitter field angle /(°)	45	g₀	Gain of optical concentrator	1
H_f	Receiving plane height /m	0.85	ψ_c	FOV of the PD /(°)	55
P_t	Single LED transmit power /mW	452	P_sens	Sensitivity of PD receiver /( A·W^-1)	0.52
ϕ_1/2	Half power angle /(°)	80	n_lens	Reflective index of a lens	1.5
-	LEDs in each lamp	7×7	-	Interval between LEDs /m	0.01

Table 2. Optical power under rectangular layout dBm
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Table 2. Optical power under rectangular layout dBm
Condition Minimumpower Maximumpower Powervariance
Original -3.74 2.04 7.92
SAA -7.73 -1.98 5.74
GSAA -7.24 -2.68 4.33
IGSAA -7.98 -3.76 3.22

Table 3. Optical power under mixed layout dBm
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Table 3. Optical power under mixed layout dBm
Condition Minimumpower Maximumpower Powervariance
Original -2.46 -1.38 2.78
SAA -6.94 -3.65 1.75
GSAA -4.90 -3.21 1.31
IGSAA -4.57 -3.71 0.99

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Liu Huanlin, Zhu Pingxin, Chen Yong, Lin Zhenyu. Optimization of Indoor VLC Coverage Uniformity by Improved Genetic Simulated Annealing Algorithm[J]. Chinese Journal of Lasers, 2019, 46(1): 106001

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