Analysis of Transmitter Half Angle and FOV Variations on Multiplexing Indoor Li-Fi Communication

Light fidelity (Li-Fi) is the communication technology that is in great demand for future technology because it provides communication services with the high bandwidth, especially for indoor communication. However, Li-Fi requires the proper device placement to meet line of sight (LOS) conditions as the primary requirement for visible light communication (VLC). Therefore, this study aims to design the multiplexing indoor Li-Fi communication model for 4 channels by varying the transmitter half angle and field of view (FOV) values using movable light emitting diode (LED) panel. The investigation is carried out for variations in the angle value of 30° up to 75° and 25 nm channel spacing using bit rate of 20 Mbps per channel. System performance observations include of the optical received power, signal to noise ratio (SNR), Q-factor and bit error rate (BER) values. Based on the test results show that the performance of each channel with 25 nm channel spacing has met the ITU-T standard, where the fourth channel has the best performance. However, the use of trasmitter half angle and FOV values have the significant effect on the received signal quality. This is indicated by the variation of the 30° half angle transmitter and FOV values which have the best received signal quality compared to other variations (45°,60°, and 75°). So this study recommends the use of a small transmitter half angle and FOV values for the application of multiplexing indoor Li-Fi.