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Achieving Higher Full-diversity Gain of Downlink STBC-MIMO SCMA System

Triratana Metkarunchit
Thai-Nichi Institute of Technology, Bangkok, 10250, Thailand

Abstract—Sparse code multiple access (SCMA) and multiple-input multiple-output (MIMO) are two important techniques that can solve high spectral efficiency problem and the massive connectivity requires of fifth generation wireless communication industry in the future. In this paper, the combination of space-time block code multiple input multiple output (STBC-MIMO) and SCMA system are suggested. However, STBC-MIMO system has diversity gain from the number of transmission and receiving antennas for flat MIMO channels. In order to make STBC-MIMO SCMA system achieve higher diversity gain, I suggest a simple method, new SCMA codeword mapping with STBC, that has diversity from the number of resolvable paths for any pairs of transmit-receive antennas. The simulation result demonstrates that the presented SCMA codeword mapping can improve bit-error rate performance.

Index Terms—5G, Sparse code multiple access, space time block code, multiple input multiple output.

Cite: Triratana Metkarunchit, "Achieving Higher Full-diversity Gain of Downlink STBC-MIMO SCMA System," Journal of Communications, vol. 13, no. 9, pp. 535-539, 2018. Doi: 10.12720/jcm.13.9.535-539.