Non-orthogonal multiple access (NOMA) is an efficient scheme of radio resource sharing. Recently, Di et al. have proposed a framework to apply the multi-dimensional trellis coded modulation (MD-TCM) in code-domain NOMA to jointly design the superposed codewords. In this study, we consider the potentiality of the coded modulation with non-binary convolutional codes for a code-domain NOMA. As a starting point, when multiple outputs from non-binary convolutional encoders are superposed, we examine whether they can be decoded or not by computer simulation. The result shows the proposed superposed coded system for 256-QAM provides coding gain over the uncoded 256-QAM system.
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