Impact of overloading on link-level performance for sparse code multiple access

Massive connectivity is one of the main requirements of the fifth generation (5G) multiple access, and sparse code multiple access (SCMA) as a new non-orthogonal multiple access technique in frequency domain will probably meet the requirement. The sparsity of codewords is the key feature of SCMA, which can enable codewords to be overloaded. In this paper, we evaluate the performance of overloading on link-level for SCMA with different levels of overloading and compare with Low Density Signature (LDS). Simulation results are provided to show the impact of codewords overloading on link-level performance. The results show that with overloading SCMA is outperform LDS in terms of BER, which confirm SCMA is a promising technology for realizing massive connectivity with various devices.

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