Design and analysis of optical receiver end by tilting receiver plane in indoor visible light communication including the NLOS link

Indoor visible light communication is a burgeoning technology that uses white light-emitting diodes (LED) for illumination to realize high rate communication. The receiving power of photodetector is limited when receiver is in the corners of the room due to the larger receiving angle, thus the signal to noise ratio (SNR) is decreased. The design method of tilting receiver plane was proposed to obtain the maximum in each place of the room including the Non-Line-of-Sight (NLOS) link. In this paper, the Line-of-Sight (LOS) was not only considered, but also the NLOS link was considered for the method of tilting the receiving plane. Newton method was employed to find the optimal tilting angle of receiver in each positon of the room and the iteration numbers of this algorithm were about three or four steps which was very fast. The simulation results show that the minimum SNR is increased 5 dB and the maximum and average SNR are both increased 2 dB. Especially, the SNR in the corners of the room is obviously increased.