Multi-Layer Coding and Map-Assisted Partial Group Decoding for Multi-Color Multi-User Visible Light Communication

In this paper, interference cancellation with multilayer coding and constrained partial group decoder (CPGD) is adopted for visible light communication (VLC) with a light emitting diode (LED) array. To reduce the online computational complexity, a decoding map on the decoding orders and the associated rate allocations is constructed via solving the max-min fairness problem based on the derived achievable rate of a VLC multiple access channel. A classification-based algorithm is proposed to reduce the decoding map size. Finally, the system throughput is further enhanced via solving the transmitter-user association problem followed by an iterative update of rate allocation and decoding order. From the numerical results, symmetric decoding map is observed for the squared transmitting LED array.