Sparse Code Multiple Access
Sparse code multiple access (SCMA) is a nonorthogonal multiple access technique based on codebooks of sparse structure.
Future 5G wireless networks are expected to support massive connectivity, higher throughput, lower latency, and lower controlling signal overhead. Compared with the conventional orthogonal multiple access techniques such as code division multiple access(CDMA) and orthogonal frequency division multiple access (OFDMA) utilized in current networks, nonorthogonal multiple access (NOMA), which has the advantage of higher resource utilization, is more promising in 5G network.
Motivated by the design of CDMA chip sequences, the idea of sparse spreading, called Low Density Signature (LDS), was first proposed by Reza Hoshyar (Hoshyar et al. 2008). LDS is a special case of multicarrier CDMA with a few nonzero elements in a long spreading signature. This sparsity characteristic can reduce the complexity...
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