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Sparse code multiple access (SCMA), as a code-domain non-orthogonal multipleaccess (NOMA) scheme, has received considerable research attention for enablingmassive connectivity in future wireless communication systems. In this paper,we present a novel codebook (CB) design for SCMA based visible lightcommunication (VLC) system, which suffers from shot noise. In particular, weintroduce an iterative algorithm for designing and optimizing CB by consideringthe impact of shot noise at the VLC receiver. Based on the proposed CB, wederive and analyze the theoretical bit error rate (BER) expression for theresultant SCMA-VLC system. The simulation results show that our proposed CBsoutperform CBs in the existing literature for different loading factors withmuch less complexity. Further, the derived analytical BER expression wellaligns with simulated results, especially in high signal power regions.

Low-Complexity Codebook Design for SCMA based Visible Light Communication