论文标题
可重新配置的智能表面辅助上行链路稀疏代码多访问
Reconfigurable Intelligent Surface-Assisted Uplink Sparse Code Multiple Access
论文作者
论文摘要
可重新配置的智能表面授权通信（RIS）和稀疏代码多访问（SCMA）是子孙后代无线网络的有前途的候选人。前者增强了传输环境，而后者则提供了高光谱效率的传输。这封信首次提出了RIS辅助上行链接SCMA（SCMA-RIS）方案，以提高常规的SCMA频谱效率。使用并修改了传递算法（MPA）的消息传递信号。此外，提出了针对SCMA-RIS方案的低复杂解码器，可显着降低MPA解码的复杂性并提高常规SCMA的位错误率性能。介绍了蒙特卡洛模拟和复杂性分析，以支持发现。
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.
