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영어

This paper investigates a novel LED lamp arrangement to reduce SNR fluctuation in indoor visible light communication system. In VLC system, the signal sources often come from several LED lamps. The different positions of the LED lamps will influence the system quality. In our proposed scheme, the LED lamp arrangement consists of N LED lamps spreading in the ceiling. The heights of all lamps are the same of 3 meters which is the height of communication room. An optimal LED arrangement with the firework algorithm is presented for the minimum SNR factor and SNR fluctuation on the light receiver plane no matter the number of lamps. In order to compare the effect of SNR distributions, the total power of N LED lamps is identical. Our studies show that the SNR factor under such a LED arrangement is reduced from 118.5 to 4.09 with 16 LED lamps multi-input system which effectively reduces the SNR fluctuation between different users. Such arrangement guarantees all users obtain almost identical communication quality regardless of users’ locations.