Abstract

Sparse code multiple access (SCMA) is a novel kind of air interface technology which can dramatically improve spectral efficiency of wireless radio access. Different from conventional CDMA and OFDMA, SCMA achieves the non-orthogonal multiple access of frequency domain. On the other hand, Multiple-Input Multiple-Output (MIMO) can make full use of spatial-domain resource to improve system performance without a corresponding increase in spectrum resource. This paper firstly combines SCMA and illustrates the system model and scheme. Particularly, Vertical Bell Labs Layered Space Time (V-BLAST) Coding and Space Time Block Coding (STBC) are applied in uplink and downlink respectively. The theoretical derivation and simulation results demonstrate that the integration of the two kinds of technology can achieve better performance.

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