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白光LED灯几MHz到几百MHz的调制带宽使其在照明的同时兼具通信功能。首先提出了照度均方差最小化准则来设计LED灯在室内的布局问题,分别考虑了不包含墙壁反射和包含墙壁反射两种情况下对室内照度分布的影响,分别给出了两种情况下白光LED灯的最优布局。然后分析了室内视距链路(不包含墙壁反射)和非视距链路(包含墙壁反射)下的室内照度分布、接收功率分布以及信噪比分布。非视距链路相对于视距链路来说,室内照度分布和接收功率分布明显增加,但是信噪比明显下降,这主要是由于非视距链路下墙壁反射产生的码间干扰所致。
White LED light modulation bandwidth of a few MHz to several hundred MHz make it both in lighting and communication functions. First of all, the criterion of minimizing the mean square deviation of illumination is proposed to design the layout problem of LED lamps indoors. The influence of indoor illumination distribution under the condition of not including wall reflection and wall reflection is considered respectively. The two cases are given respectively. LED lighting the best layout. Then, the indoor illumination distribution, the received power distribution and the signal-to-noise ratio distribution under indoor line-of-sight links (excluding wall reflection) and NLOS (including wall reflection) are analyzed. Non-line-of-sight links Compared with line-of-sight links, the indoor illumination distribution and received power distribution increase obviously, but the signal-to-noise ratio decreases obviously, which is mainly caused by intersymbol interference caused by wall reflection under non-line-of- .