Abstract: In order to meet the needs of large-scale user access and differentiated user request rates, non-orthogonal multiple access (NOMA) and orthogonal multiple access schemes for fuzzy logic decision-making in indoor visible light communications (VLC) are studied. The proposed scheme considers the number of users, user request rate and user channel gain, and designs a mode selection algorithm based on fuzzy logic to decide the user access NOMA or orthogonal multiple access mode. In power allocation phase, an unequal subcarrier power allocation between NOMA group and power allocation between users in a NOMA group according to user’s differentiated request rates are designed to improve the throughput of the system. The simulation results show that proposed scheme can improve the VLC system throughput and average user satisfaction.

Key words: indoor visible light communication, fuzzy logical, mode selection, multiple access, power allocation