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The major challenge faced by the fifth generation (5G) mobile network is higher spectral efficiency and massive connectivity, i.e., the target spectrum efficiency is 3 times over 4G, and the target connection density is one million devices per square kilometer. These requirements are difficult to be satisfied with orthogonal multiple access (OMA) schemes. Non-orthogonal multiple access (NOMA) has...
Sparse code multiple access (SCMA) is a proposed candidate for multiple access method in 5G telecommunication. In SCMA system, the classic receiver is message passing algorithm (MPA). MPA can reach a near optimal performance, but the computation process is complicated and time-consuming, so MPA is suitable for advanced terminal. But for simple terminal such as sensor node, large mount of calculations...
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