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An Improved Uplink Sparse Coded Multiple Access
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DOI：10.1109/LCOMM.2016.2613934.png)
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Abstract
En 中文
Sparse coded multiple access (SCMA) has received considerable attention recently as a candidate multiple access scheme for 5G cellular systems. This letter proposes an improved uplink SCMA scheme where instead of the multi-dimensional constellation (MDC) mapping and a fixed number of nonzero elements per sparse codeword, a varying number of coded symbols from each user are directly mapped onto the resource elements. We show that the proposed SCMA scheme outperforms the MDC-SCMA scheme in terms of both error rate performance and receiver complexity when the user load is high.
Keywords:
Sparse coded multiple access
iterative receiver
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