Reconfigurable Intelligent Surface Enhanced NOMA Assisted Backscatter Communication System
Reconfigurable Intelligent Surface Enhanced NOMA Assisted Backscatter Communication System
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DOI：
10.1109/tvt.2021.3087582
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发表时间：
2020-12
影响因子：
6.8
通讯作者：
Jia-kuo Zuo;Yuanwei Liu;Liang Yang;Lingyang Song;Ying-Chang Liang
中科院分区：
文献类型：
--
作者：
Jia-kuo Zuo;Yuanwei Liu;Liang Yang;Lingyang Song;Ying-Chang Liang
为了增强非正交多址辅助后向散射通信(NOMABC)中具有双衰落效应的后向散射链路，提出了一种新的可重构智能表面(RIS)增强NOMABC系统。建立了后向散射器件的功率反射系数和后向散射器件的相移的联合优化问题。针对这一非凸优化问题，通过调用交替优化、逐次凸逼近和流形优化算法，提出了一种低复杂度算法。数值结果证实了所提出的RIS-NOMABC系统的性能优于没有RIS的传统NOMABC系统，并证明了所提算法的可行性和有效性。
To enhance the backscatter-links with double fading effect in non-orthogonal multiple access assisted backscatter communication (NOMABC), a new reconfigurable intelligent surface (RIS) enhanced NOMABC (RIS-NOMABC) system is proposed. A joint optimization problem over power reflection coefficients at the backscatter devices (BDs) and phase shifts at the RIS is formulated. To solve this non-convex problem, a low complexity algorithm is proposed by invoking the alternative optimization, successive convex approximation and manifold optimization algorithms. Numerical results corroborate that the proposed RIS-NOMABC system outperforms the conventional NOMABC system without RIS, and demonstrate the feasibility and effectiveness of the proposed algorithm.