Zhao Li, Zhu Tong, Liu Zhigang, et al. An annular light source layout model for both lighting and communication reliability[J]. Opto-Electronic Engineering, 2018, 45(7): 170503. doi: 10.12086/oee.2018.170503
Citation: Zhao Li, Zhu Tong, Liu Zhigang, et al. An annular light source layout model for both lighting and communication reliability[J]. Opto-Electronic Engineering, 2018, 45(7): 170503. doi: 10.12086/oee.2018.170503

An annular light source layout model for both lighting and communication reliability

    Fund Project: Supported by National Defense Foundation of China (61271362, 61671362), the general project Industrial Area of Shaanxi Province, China (2017GY-081), the Natural Science Foundation of Shaanxi Province, China (2017JM6041), Xi'an Science and Technology Planning Project (2017075CG/RC038 (XAGY001)), and Research Foundation of Education Bureau of Shaanxi Province, China (2017JK0373)
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  • The traditional layout of light source based on array will inevitably lead to uneven illumination and BER in the room. In order to improve the illumination uniformity and reliability of the system, it is necessary to optimize the layout of the light source reasonably. In this paper, a 4 m × 4 m × 3 m room is used as the model to design a ring light source layout model with a single-LED array and lamp belts. In this model, the distance between the inner lamps of the 6 × 6 LED array is 0.3 m. The number of surrounding lamp beads is 316 and the distance between the lamps is 0.05 m. The simulation results show that the system illumination is about 437.08 lx and the illumination uniformity is 93.9%. At the same time, the system error rate is about 2.8716×10-7.The annular light source layout model designed in this paper takes into account the uniformity of indoor illumination distribution and the reliability of communication simultaneously, which can meet the indoor lighting and communication at the same time and also can provide an optimization method for the layout of indoor visible light communication.
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  • Overview: Indoor visible light communication technology is a new wireless data transmission method based on white light LED. With the rapid development of wireless transmission and the increasing tension of the current wireless spectrum resources, the research of visible light communication has become a research hotspot in the field of communication. The light source LED should take the dual functions of lighting and communication into consideration at the same time. In order to effectively ensure uniformity of lighting and the reliability of communication, a reasonable layout of the light source is needed to get a simple and beautiful layout structure and can effectively avoid the shadow effect and improve the uniformity of lighting and the reliability of communication. At present, there are many literatures on indoor illumination and visible light communication reliability at domestic and foreign, but most of them are based on the traditional array layout model that has the weaknesses of large illumination variance and uneven illumination distribution. In order to avoid these problems in traditional array layout model, a 4 m×4 m×3 m indoor model is adopted as the real space transport model to calculate the indoor illumination distribution and communication reliability, and a ring light source layout model with a single-LED array and lamp belts is designed based on the principle of illumination compensation. Through the numerical analyses of the minimum illumination and the uniformity of illumination under different layout parameters, it is concluded that the entire receiving plane illumination is between 300 lx~470 lx when the distance between the inner lamps of the 6 × 6 LED array is 0.3 m and the number of surrounding lamp beads with distance of 0.05 m is 316. Under this layout model, the maximum and minimum illuminations of the system are about 465.1 lx and 331.4 lx, respectively. Furthermore, the mean light intensity is about 437.0751 lx, and the uniformity of about 93.9% can be achieved. Compared with the traditional 4-LED array layout model, the illumination uniformity is increased by 4.54%. At the same time, the average BER of the annular light source model is about 2.8716×10-7 that is lower than that of the 4-LED array layout model. Therefore, the annular light source layout model designed in this paper can not only meet the uniformity of indoor illumination distribution but also ensure the reliability of communication, thus providing an effective layout method for indoor visible light communication.

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