Abstract
Sparse code multiple access (SCMA) is a promising non-orthogonal multiple access technique for future wireless systems. SCMA systems are sensitive to designing multidimensional constellations. It is crucial to employ a constellation that is suitable for a certain application. In this paper, we highlight the key performance indicators (KPIs) of multidimensional constellations that should be considered in their design process for various channel scenarios. We then evaluate the performance of some of the well-known SCMA constellations for uncoded, high-rate, and low-rate LTE turbo-coded SCMA systems. All turbo-coded comparisons are performed for bit-interleaved coded modulation, with a concatenated detection and decoding scheme. Simulation results confirm that multidimensional constellations that satisfy KPIs of a certain channel scenario outperform others.
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