摘要
针对煤矿工作面可见光通信系统中光源发光二极管(LED)导致接收平面光信号信噪比(SNR)分布不均匀的问题,提出了优化LED光源高度、提高工作面接收平面光信号SNR分布均匀性的新方法.可见光通信中接收点光功率与距离平方成反比,随着通信距离的改变,接收光功率变化明显,应用群体优化算法——烟花算法搜索每个LED光源高度,降低接收平面SNR波动,增加接收平面SNR均值,提高系统整体性能.结果表明:LED光源高度在0.85~3.00m范围内调节时,光接收平面SNR方差由2.16×104降低到1.08×10~4,SNR因子从32.703 4降低到16.678 4,SNR均值从44.967提高到62.390;LED光源高度限制在2.60~3.00m时,光接收平面SNR方差由2.16×104降低到1.61×10~4,SNR因子从32.703 4降低到22.693 1,SNR均值从44.967提高到55.850,有效改进了接收平面SNR均匀性和系统SNR性能.
To solve the problem of signal-to-noise ratio （SNR） uneven distribution on the receiver plane caused by LED sources in coalface visible light communications,a new method was proposed to increase the SNR distribution uniformity through LED heights optimizing.The received light power is inversely proportional to the square of the light propagation distance in visible light communications.So,when the light propagation distance varies,the received light power and the SNR will change quickly.The fireworks algorithm,a group optimization algorithm,was used to regulate every LED height in a global range.By this method,the SNR fluctuation was reduced to improve the SNR mean value and the system performance.Simulation results show that the SNR variance on light receiver plane reduces to 1.08× 10^4 from 2.16 × 10^4,the SNR factor reduces to 16.678 4 from 32.703 4 and the mean SNR increases from 44.967 to 62.390 when heights of LED sources are between 0.85 and 3.00 meters.When heights of LED sources are confined from 2.60 to 3.00 meters,the SNR variance reduces to 1.61×10^4 from 2.16×10^4,the SNR factor reduces to 22.693 1 from 32.703 4 and the mean SNR increases from 44.967 to 55.850.From the above data,we can see that the SNR uniformity and the system performance are effectively increased.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2017年第5期1174-1180,共7页
Journal of China University of Mining & Technology
基金
江苏省自然科学基金项目(BK20151148)
江苏省科技成果转化专项资金项目(BA2016016)
徐州市科技计划项目(KC14SM097)
关键词
可见光通信
烟花算法
高度调节
信噪比
SNR因子
visible light communication
fireworks algorithm
altitude optimization
signal-to-noise ratio
SNR factor
