考虑HPSA的IRS辅助室内VLC系统光源优化

doi:10.19665/j.issn1001-2400.20240103

摘要/Abstract

摘要：

针对可见光通信(VLC)系统中接收平面光功率分布不均匀的问题,提出了一种基于混合粒子群算法(HPSA)的智能反射面(IRS)辅助室内VLC系统光源优化设计方案。以16个发光二极管(LED)的矩形和混合型布局为例,设置接收光功率方差为适应度函数,将所提出的HPSA与IRS技术相结合,对LED的位置布局、半功率角以及IRS的偏航角与滚转角进行优化。仿真对比了初始的(未经优化)、基于HPSA优化的室内VLC系统,以及基于HPSA优化的IRS辅助VLC系统的性能。结果表明,在考虑一次反射链路的情况下,与初始的VLC系统相比,采用HPSA优化的系统在两种光源布局下的接收光功率以及信噪比波动都明显降低;基于HPSA优化的IRS辅助室内VLC系统在矩形布局下对接收光功率波动的改善与基于HPSA优化的VLC系统效果相当,其在混合型布局下明显低于仅采用HPSA优化的VLC系统的光功率波动。3种可见光通信系统中,基于HPSA优化的IRS辅助VLC系统的平均接收光功率最大。此外,上述3种VLC系统采用混合型布局的平均均方时延拓展性能均优于矩形布局。研究工作对室内可见光通信系统光源分布研究具有一定参考价值。

关键词: 可见光通信系统, 发光二极管, 光源优化, 混合粒子群算法, 智能反射面, 接收光功率, 信噪比

Abstract:

Aiming at the problem of unevenness of optical power distribution on the receiving plane in a visible light communication(VLC) system,a light source optimization method for an intelligent reflecting surface(IRS)-assisted indoor VLC system based on the hybrid particle swarm algorithm(HPSA) is proposed.Taking the two layout schemes of rectangular and hybrid arrangements with 16 light-emitting diodes(LEDs) as examples,the variance of received optical power on the receiving plane is set as the fitness function,and the proposed HPSA is combined with the IRS technology to optimize the half-power angle and positional layout of LEDs as well as the yaw and roll angles of IRS.Subsequently,initial(unoptimized) optimization using the HPSA,and optimization using the HPSA for the IRS-aided VLC systems are simulated and compared.The results indicate that when considering the first reflection link,compared to the original VLC system,the fluctuations of received optical power and signal-to-noise ratio of the VLC system optimized with the HPSA significantly decrease for both light source layouts;the HPSA optimized IRS-aided indoor VLC system improves the received optical power fluctuations in the rectangular layout as well as the HPSA optimized VLC system,and its performance is significantly better than that of the HPSA optimized VLC system only in the hybrid layout for optical power fluctuations improvement.Among the three VLC systems,the IRS-aided VLC system based on HPSA optimization has the largest average received optical power.Besides,the average root mean square delay spread performance of the above three VLC systems using a hybrid layout is better than that of a rectangular layout.This work will benefit the study of light source distribution in indoor VLC systems.

Key words: visible light communication, light emitting diodes, light source optimization, hybrid particle swarm algorithm, intelligent reflecting surface, received optical power, signal to noise ratio

中图分类号:

TN92

何慧萌, 杨婷, 施会丽, 王平, 邴喆, 王星, 白勃. 考虑HPSA的IRS辅助室内VLC系统光源优化[J]. 西安电子科技大学学报, 2024, 51(2): 46-55.

HE Huimeng, YANG Ting, SHI Huili, WANG Ping, BING Zhe, WANG Xing, BAI Bo. Optimization of light sources for the IRS-assisted indoor VLC system considering HPSA[J]. Journal of Xidian University, 2024, 51(2): 46-55.

图/表 11

图1

图2

图3

图4

表1

图5

表2

HPSA优化的IRS辅助VLC系统的矩形布局参数"

S/m	L/m	w/(°)	ϑ/(°)	θ $1 / 2 1$ /(°)	θ $1 / 2 2$ /(°)	θ $1 / 2 3$ /(°)	θ $1 / 2 4$ /(°)	θ $1 / 2 5$ /(°)	θ $1 / 2 6$ /(°)
0.1	1.6	17.18	15.47	32.63	37.45	39.62	30.46	41.76	43.22
θ $1 / 2 7$ /(°)	θ $1 / 2 8$ /(°)	θ $1 / 2 9$ /(°)	θ $1 / 2 10$ /(°)	θ $1 / 2 11$ /(°)	θ $1 / 2 12$ /(°)	θ $1 / 2 13$ /(°)	θ $1 / 2 14$ /(°)	θ $1 / 2 15$ /(°)	θ $1 / 2 16$ /(°)
40.08	37.73	36.53	42.39	45.52	42.28	34.56	35.56	38.22	31.11

表2

表3

HPSA优化的IRS辅助VLC系统的混合型布局参数"

r/m	a/m	b/m	w/(°)	ϑ/(°)	θ $1 / 2 1$ /(°)	θ $1 / 2 2$ /(°)	θ $1 / 2 3$ /(°)	θ $1 / 2 4$ /(°)	θ $1 / 2 5$ /(°)	θ $1 / 2 6$
2.4	0.1	0.4	13.17	38.38	38.22	33.98	32.12	34.55	40.22	45.25
θ $1 / 2 7$ /(°)	θ $1 / 2 8$ /(°)	θ $1 / 2 9$ /(°)	θ $1 / 2 10$ /(°)	θ $1 / 2 11$ /(°)	θ $1 / 2 12$ /(°)	θ $1 / 2 13$ /(°)	θ $1 / 2 14$ /(°)	θ $1 / 2 15$ /(°)	θ $1 / 2 16$ /(°)
39.92	42.89	35.63	45.56	42.36	44.31	35.82	31.89	45.33	36.78

表3

图6

图7

图8

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参数	符号	数值	参数	符号	数值
P_t/W	LED发射光功率	1	FOV/(°)	接收机视场角	90
A/cm²	接收机有效面积	1	T_s(ϕ)	滤波器增益	1
R/(A·W^-1)	光电转换效率	0.35	G_s(ϕ)	聚光器增益	1
ρ	墙面反射系数	0.8	dA_IRS/cm²	IRS单元反射面积	0.01
ρ_IRS	IRS反射系数	0.95	q/C	电荷量	1.6×10^-19
Γ	信道噪声因子	0.62	I_bg/mA	暗电流值	0.1
g_m/(m·s^-1)	跨导率	30	T/次	最大迭代次数	100