Modular Arithmetic Broadcasting (MAB) for VLC

Aiming at massive connectivity and enhanced spectral efficiency, non-orthogonal multiple access (NOMA) has been extensively investigated in the context of optical wireless communications and especially of visible light communications (VLC). However, the use of successive interference cancellation (SIC) at the receiver is a limiting factor because of increased complexity, particularly in downlink NOMA. In this work, we propose a practical SIC-free constellation-based scheme for VLC networks, namely modular arithmetic broadcasting (MAB). The performance of the considered system is evaluated in terms of bit error probability, for which closed-form expression are derived. Numerical results validate the theoretical analysis and highlight the superiority of the proposed scheme over SIC-based NOMA.