Performance Analysis of Optical OFDM Adaptive Bit-Power Loading in Indoor Visible Light Communications

Kejun Jia; Bin Jin; Li Hao

doi:10.3788/LOP56.030603

Laser & Optoelectronics Progress, Volume. 56, Issue 3, 030603(2019)

Performance Analysis of Optical OFDM Adaptive Bit-Power Loading in Indoor Visible Light Communications

Kejun Jia^1、*, Bin Jin¹, and Li Hao²

Author Affiliations

¹ School of Computer and Communication, Lanzhou University of Technology, Lanzhou, Gansu 730050, China

² Sichuan Provincial Key Laboratory of Information Coding & Transmission, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;

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Figures & Tables(12)

Fig. 1. Geometrical model of indoor VLC

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Fig. 2. Schematic of the multipath channel model

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Fig. 3. Diagram of the optical adaptive bit-power loading OFDM system

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Fig. 4. Channel gain with different coordinates of PD. (a) (3,3,0.85); (b) (1.5,1.5,0.85); (c) (0.5,0.5,0.85)

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Fig. 5. (a)-(c) Bit allocation and (d)-(f) power allocation of three kinds of algorithms in ACO-OFDM system

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Fig. 6. (a)-(c) Bit allocation and (d)-(f) power allocation of three kinds of algorithms in DCO-OFDM system

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Fig. 7. Comparison of BER performance for adaptive ACO-OFDM and adaptive DCO-OFDM

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Table 1. Simulation parameters

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Table 1. Simulation parameters

Parameter	Value
LED modulation bandwidth B_LED /MHz	100
Semi-angle at half power θ_1/2 /(°)	60
FOV at a PD Ψ_FOV/(°)	80
Detector physical area of a PD A_R /cm²	1
Reflectivity of wall ρ_i	0.8
Reflectivity area of small region ΔA /m²	0.01

Table 2. Algorithm simulation parameters
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Table 2. Algorithm simulation parameters
Parameter Value
S_av 16
P_av 1
I_max 10
K 6
b_BER 1×10^-4

Table 3. Power comparison results of adaptive ACO-OFDM
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Table 3. Power comparison results of adaptive ACO-OFDM
Method P_{opt_equ} P_{opt_adapt} P_{ele_equ} P_{ele_adapt}
Chow 0.2848 0.2255 0.2469 0.1639
Hughes-Hartogs 0.2848 0.2669 0.2469 0.2291
Fischer 0.2848 0.2064 0.2469 0.1549

Table 4. Power comparison results of adaptive DCO-OFDM
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Table 4. Power comparison results of adaptive DCO-OFDM
Method P_{opt_equ} P_{opt_adapt} P_{ele_equ} P_{ele_adapt}
Chow 1.9925 1.7432 4.8950 3.7981
Hughes-Hartogs 1.9925 1.8451 4.8950 4.2295
Fischer 1.9925 1.5553 4.8950 3.0132

Table 5. Comparison of power allocation for ACO-OFDM and DCO-OFDM
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Table 5. Comparison of power allocation for ACO-OFDM and DCO-OFDM
Fischer P_{opt_adapt} P_{ele_adapt}
ACO-OFDM 0.2064 0.1549
DCO-OFDM 1.6390 3.3537

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Kejun Jia, Bin Jin, Li Hao. Performance Analysis of Optical OFDM Adaptive Bit-Power Loading in Indoor Visible Light Communications[J]. Laser & Optoelectronics Progress, 2019, 56(3): 030603

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