Hardware and Software Improvements of Spatial Light Modulator (SLM)-Based Optical Wireless Communication Supporting Four Users Using Non-Orthogonal Multiple Access (NOMA)

We propose and experimentally demonstrate a spatial-light-modulator (SLM) based optical wireless communication (OWC) system using non-orthogonal multiple access realizing four-layer of successive interference cancellation (SIC) iterations for the first time. This can be attributed by our two contributions. First, an iterative phase correction algorithm (PCA) is proposed for addressing the SLM non-ideal effects. Second, low-density parity check is utilized to provide coding gain for the SIC. Experimental results show that 3.5-dB improvement at a steering angle of (5^o, 5^o) is achieved by the PCA, and >54-Gbps total data rate is achieved in the 4-user OWC system.