Sum rate utilization of 4×4 multiple-input multiple-output (MIMO) visible light communication (VLC)

摘要

In this work, 4×4 Multiple-Input Multiple-Output Visible Light Communication (MIMO-VLC) system architecture is proposed with the capability of serving up to six users. Each transmitter has four LEDs and each receiver has four photodetectors. Therefore, the link between the transmitter and any user has different sixteen routs. The proposed system used non-orthogonal multiple access (NOMA) to utilize the system bandwidth. Numerical simulation is applied to evaluate the system performance. The relation between normalized offset and sum rate is analyzed and discussed. The results show that the system sum rate has been improved at the system edge with increasing the number of users. On the other hand, adding extra users affects the average bit rate allowed for each user. Thus, the relation between the number of users and the normalized offset is provided. The benefits and drawbacks of adding extra users to the proposed system are also discussed through this work.