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Joint Design for Simultaneously Transmitting And Reflecting (STAR) RIS Assisted NOMA Systems
arXiv - CS - Information Theory Pub Date : 2021-06-06 , DOI: arxiv-2106.03001
Jiakuo Zuo, Yuanwei Liu, Zhiguo Ding, Lingyang Song, H. Vincent Poor

Different from traditional reflection-only reconfigurable intelligent surfaces (RISs), simultaneously transmitting and reflecting RISs (STAR-RISs) represent a novel technology, which extends the \textit{half-space} coverage to \textit{full-space} coverage by simultaneously transmitting and reflecting incident signals. STAR-RISs provide new degrees-of-freedom (DoF) for manipulating signal propagation. Motivated by the above, a novel STAR-RIS assisted non-orthogonal multiple access (NOMA) (STAR-RIS-NOMA) system is proposed in this paper. Our objective is to maximize the achievable sum rate by jointly optimizing the decoding order, power allocation coefficients, active beamforming, and transmission and reflection beamforming. However, the formulated problem is non-convex with intricately coupled variables. To tackle this challenge, a suboptimal two-layer iterative algorithm is proposed. Specifically, in the inner-layer iteration, for a given decoding order, the power allocation coefficients, active beamforming, transmission and reflection beamforming are optimized alternatingly. For the outer-layer iteration, the decoding order of NOMA users in each cluster is updated with the solutions obtained from the inner-layer iteration. Moreover, an efficient decoding order determination scheme is proposed based on the equivalent-combined channel gains. Simulation results are provided to demonstrate that the proposed STAR-RSI-NOMA system, aided by our proposed algorithm, outperforms conventional RIS-NOMA and RIS assisted orthogonal multiple access (RIS-OMA) systems.

中文翻译:

同时传输和反射 (STAR) RIS 辅助 NOMA 系统的联合设计

与传统的仅反射可重构智能表面 (RIS) 不同,同时发射和反射 RIS (STAR-RIS) 代表了一种新技术,它将 \textit{half-space} 覆盖范围同时扩展到 \textit{full-space} 覆盖范围传输和反射入射信号。STAR-RIS 为操纵信号传播提供了新的自由度 (DoF)。受上述启发,本文提出了一种新型的 STAR-RIS 辅助非正交多路访问 (NOMA) (STAR-RIS-NOMA) 系统。我们的目标是通过联合优化解码顺序、功率分配系数、主动波束成形以及传输和反射波束成形来最大化可实现的总速率。然而,公式化的问题是非凸的,具有错综复杂的耦合变量。为了应对这一挑战,提出了一种次优的两层迭代算法。具体而言,在内层迭代中,对于给定的解码顺序,功率分配系数、主动波束形成、传输和反射波束形成交替优化。对于外层迭代,用内层迭代得到的解更新每个簇中 NOMA 用户的解码顺序。此外,提出了一种基于等效组合信道增益的高效解码顺序确定方案。仿真结果表明,在我们提出的算法的帮助下,所提出的 STAR-RSI-NOMA 系统优于传统的 RIS-NOMA 和 RIS 辅助正交多址 (RIS-OMA) 系统。功率分配系数、主动波束成形、透射和反射波束成形交替优化。对于外层迭代,用内层迭代得到的解更新每个簇中 NOMA 用户的解码顺序。此外,提出了一种基于等效组合信道增益的高效解码顺序确定方案。仿真结果表明,在我们提出的算法的帮助下,所提出的 STAR-RSI-NOMA 系统优于传统的 RIS-NOMA 和 RIS 辅助正交多址 (RIS-OMA) 系统。功率分配系数、主动波束成形、透射和反射波束成形交替优化。对于外层迭代,用内层迭代得到的解更新每个簇中 NOMA 用户的解码顺序。此外,提出了一种基于等效组合信道增益的高效解码顺序确定方案。仿真结果表明,在我们提出的算法的帮助下,所提出的 STAR-RSI-NOMA 系统优于传统的 RIS-NOMA 和 RIS 辅助正交多址 (RIS-OMA) 系统。每个集群中 NOMA 用户的解码顺序使用从内层迭代获得的解决方案进行更新。此外,提出了一种基于等效组合信道增益的高效解码顺序确定方案。仿真结果表明,在我们提出的算法的帮助下,所提出的 STAR-RSI-NOMA 系统优于传统的 RIS-NOMA 和 RIS 辅助正交多址 (RIS-OMA) 系统。每个集群中 NOMA 用户的解码顺序使用从内层迭代获得的解决方案进行更新。此外,提出了一种基于等效组合信道增益的高效解码顺序确定方案。仿真结果表明,在我们提出的算法的辅助下,所提出的 STAR-RSI-NOMA 系统优于传统的 RIS-NOMA 和 RIS 辅助正交多址 (RIS-OMA) 系统。
更新日期:2021-06-08
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