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室内可见光通信是一种利用室内照明白光LED灯来实现高速通信的新兴技术。当接收器在室内角落时较大的接收角限制了光电探测器的接收功率,从而降低了系统信噪比。为了实现接收器在室内各个位置处均能获得最大功率,提出了包含非视距链路情况下(墙壁一次反射)倾斜探测器接收面的设计方法,即在考虑视距链路(直射)的同时,还考虑了墙壁一次反射非视距链路下倾斜接收器的倾角设计。在室内各个位置处的最优倾斜角度可以通过牛顿算法得到,该快速算法的迭代次数仅为3~4次。仿真结果表明,倾斜接收器后系统最小信噪比提高大约5 d B,最大信噪比和平均信噪比均提高大约2 d B。尤其对改善室内角落处的信噪比最为显著。
Indoor visible light communication is an emerging technology that uses white LED lights for indoor lighting to achieve high-speed communications. A larger acceptance angle limits the receive power of the photodetector when the receiver is in a corner of the room, reducing the system signal-to-noise ratio. In order to obtain maximum power of the receiver at every position in the room, a design method of the receiving surface of the tilt detector with a non-line-of-sight link (wall primary reflection) is proposed. That is, At the same time, the inclination design of the tilt receiver under the non-line-of-sight link with one reflection on the wall is also considered. The optimal tilt angle at various locations in the room can be obtained by Newton’s algorithm. The iteration number of this fast algorithm is only 3 ~ 4 times. The simulation results show that the minimum signal-to-noise ratio of the system after tilted receiver is increased by about 5 d B, and the maximum SNR and the average signal-to-noise ratio increase by about 2 dB. Especially for improving the signal to noise ratio at the corner of the room is the most significant.