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Reconfigurable Intelligent Surface-Assisted Uplink Sparse Code Multiple Access
arXiv - CS - Emerging Technologies Pub Date : 2020-11-19 , DOI: arxiv-2011.09647
Ibrahim Al-Nahhal; Octavia A. Dobre; Ertugrul Basar

Reconfigurable intelligent surface-empowered communication (RIS) and sparse code multiple access (SCMA) are promising candidates for future generations of wireless networks. The former enhances the transmission environments, whereas the latter provides a high spectral efficiency transmission. This letter proposes, for the first time, an RIS-assisted uplink SCMA (SCMA-RIS) scheme to improve the conventional SCMA spectrum efficiency. The message passing algorithm (MPA) is utilized and modified to decode the SCMA-RIS transmitted signals. Moreover, a low-complexity decoder for the SCMA-RIS scheme is proposed to significantly reduce the MPA decoding complexity and improve the bit error rate performance of the conventional SCMA. Monte-Carlo simulations and complexity analysis are presented, which support the findings.
更新日期:2020-11-21
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