A low complexity power allocation scheme for NOMA-based indoor VLC systems

The narrow modulation bandwidth of light emitting diode (LED) is a barrier for indoor visible light communication (VLC) systems to achieve high data rate. The non-orthogonal multiple access (NOMA) is considered to be a promising technology to improve spectral efficiency of wireless communication systems. In this paper, we apply the non-orthogonal multiple access (NOMA) to visible light communication (VLC) systems, and propose a low complexity power allocation scheme for NOMA-based indoor VLC systems which is called the simplified gain ratio power allocation (S-GRPA) scheme. In the S-GRPA scheme, the channel state information (CSI) used for power allocation is not complete and obtained through look-up table method rather than calculation, which reduces the complexity of the power allocation scheme. Simulation results are presented to verify the effectiveness of the proposed scheme.