Experimental Comparison of Multi-User Access Schemes with Multiband CAP

Multi-band carrierless amplitude and phase modulation ( $\pmb{m}$ -CAP) is associated with subcarrier multiplexing (SCM), multi-carrier code division multiple access (MC-CDMA) and power-domain non-orthogonal multiple access (PD-NOMA) to form novel multi-user visible light communication (VLC) schemes. The combination with MC-CDMA and PD-NOMA are explored for the first time using the $\pmb{m}$ -CAP modulation. In order to study the associations, their performances are compared experimentally. The data rate per user, the deviation from a user's target throughput and the maximum serviceable area for different number of users are all measured in this paper. The association of PD-NOMA with SCM and $\pmb{m}$ -CAP shows a data rate of 40.62 Mb/s per user with only 2.5 Mb/s of throughput variation in a 4-user scenario, as well as an attocell size 1.75 meter square larger than associations based on MC-CDMA.