Design of Codebook for Long-reach Sparse Code Multiple Access Passive Optical Networks

Sparse code multiple access (SCMA) is a promising technology for long-reach passive optical networks (LR-PONs). The design of SCMA codebooks is crucial to system capacity and transmission performance. In this paper, a novel design of SCMA codebooks over fiber channel is proposed, including a low-complexity design criterion based on error probability minimization for independent resource elements and a new labelling rule. The simulation results show that the presented low-complexity SCMA codebook design exhibits good transmission performance, especially in the low optical signal-to-noise ratio (SNR) regions. The codebook design is applicable to LR optical access networks.