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In the indoor visible light communication (VLC) system, the light source has the dual function of illumination and communication. Due to the different size of indoor space and indoor facilities, it will inevitably lead to different indoor light power distribution. In order to achieve the optimal communication effect, the layout of the light source must be reasonably designed so that the receiving power distribution is relatively uniform on the same horizontal plane in the room. The current layout methods are mostly based on the square plane three-dimensional space, while the layout methods of the rectangular plane three-dimensional space are rarely studied. In this paper, a room with size 5m×4m×3m is used as a model. Firstly, according to the shock response principle, the optimal layout of four LED lights is obtained through theoretical calculations, so that the received light power fluctuation in the z=h plane in this room is minimized. Then, according to a set of simulation parameters, the theoretical optimal layout with the minimum fluctuation of receiving optical power in the h=0.75m plane in the room is calculated, and then Matlab is used to simulate the received optical power distribution of the plane under different layouts. The simulation results are consistent with the theoretical calculations. Finally, the illumination distribution under the optimal layout is calculated to verify that the designed optimal layout meets the international illumination standards. The light source layout model designed in this paper not only meets the illumination standards, but also ensures the reliability of communication. It provides an optimization method for the layout of indoor visible light communication LED light source.
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