  Non-orthogonal multiple access (NOMA) schemes have been proved to increase
the multiple-access achievable rate with respect to orthogonal multiple access
(OMA). In this paper we propose a novel communication system that combines
multi-level coded modulation and polar codes in a NOMA scenario. Computational
complexity decreases with the proposed scheme with respect to state-of-the-art
solutions. We also highlight the trade-off between error rate performance and
computational complexity.
