光源布局是影响室内LED光通信照明和通信性能的关键因素之一。相比传统布局使用的大发散角朗伯型LED,小发散角LED具有反射面积小、中心光强度高等优点。以小发散角LED为光源,以最优光照度均匀性、最少LED数量为目标,对正方形和长方形房间的光源布局进行了优化设计,并分析了优化布局的系统性能。结果表明,两种房间中优化布局的照度均匀率均大于90%,接收光功率均大于-2 dBm。在正方形房间中将LED数量减少16个时,用本方法优化后的系统性能优于传统布局,平均光照度提高了7.7%,平均信噪比提高了0.89 dB,信噪比均方差降低了0.04 dB。

Light source layout is one of the key factors that affects indoor LED optical communication lighting and communication performance. Compared with the large divergence angle Lambertian LED used in the traditional layout, small divergence angle LED has the advantages of small reflection area and high central light intensity. This article uses LED with small divergence angle as light source, and aiming at the optimal uniformity of illumination and the minimum number of LEDs, the light source layout of square and rectangular rooms are optimized, and the system performance of the optimized layout is analyzed. The results show that the illuminance uniformity of the optimized layout in both rooms are greater than 90%, and the received optical power is also greater than -2 dBm. Moreover, in the square room, under the premise of reducing the number of LEDs by 16, the system performance is better than the traditional layout, the average illumination is improved by 7.7%, the average signal-to-noise ratio is improved by 0.89 dB, and the mean variance of signal-to-noise ratio is reduced by 0.04 dB.