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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.
Aiming at the problem of uneven distribution of signal-to-noise ratio (SNR) of receiving planar optical signal in light-emitting diode (LED) of visible light communication system in coal mine working face, the paper proposes to optimize the height of LED light source and improve the SNR distribution uniformity of receiving plane optical signal The new method is that the optical power of receiving point in visible light communication is inversely proportional to the square of the distance, and the received optical power changes obviously with the change of communication distance. Using the algorithm of group optimization-fireworks algorithm to search the height of each LED light source, The average SNR of receiving plane is increased to improve the overall performance of the system.The results show that when the height of LED light source is adjusted in the range of 0.85 ~ 3.00m, the SNR variance of light receiving plane is reduced from 2.16 × 104 to 1.08 × 10 ~ 4 and the SNR factor is decreased from 32.703 4 To 16.678 4. SNR mean increased from 44.967 to 62.390. When the LED light source height was limited to 2.60 ~ 3.00m, the variance of light receiving plane SNR was reduced from 2.16 × 104 to 1.61 × 10 ~ 4, SNR factor decreased from 32.703 4 to 22.693 1, The average SNR increases from 44.967 to 55.850, which effectively improves the receiver plane SNR uniformity and system SNR performance.