Enhancement of Successive Interference Cancellation in Visible Light Communication System

For massive communication, Non orthogonal Multiple Access is considered to be implemented in next generation of 6G. Beside using radio frequencies as physical layer for wireless communication, optical wireless communication has advantages for support high speed and low error for communication. But, to server massive user, we have struggles with limited resource of power, frequency and time. In this study, we proposed the T-Fold Irregular Repetition Slotted ALOHA (IRSA) method for the Visible Light Communication (VLC) system to improve its performance. We used IRSA based on Coded Slotted ALOHA (CSA) scheme that utilities interference among users. To prove our method, we used simulation in a closed room with a room size of 6 x 6 x 6 m, using the LOS channel and transmitted power of Light Emitting Diode (LED) is 1 Watt. There are 11, 13, and 15 users with random positions that send packets in 100 time-slots based on their degree distribution. The results showed that the larger the degree distributions impact the performance. We also show that between the number of user 11 and 15, the throughput increased up to 20%, while the Packet Loss Ratio (PLR) decreased for 15 users. In addition, 6-degree distribution is used for optimal performance in 15 users.