Competitive IRS Assignment for IRS-Based NOMA System
Competitive IRS Assignment for IRS-Based NOMA System
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DOI：
10.1109/lwc.2023.3333965
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发表时间：
2024-02
影响因子：
6.3
通讯作者：
H. Al-Obiedollah;Hythem Bany Salameh;K. Cumanan;Zhiguo Ding;O. Dobre
中科院分区：
文献类型：
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作者：
H. Al-Obiedollah;Hythem Bany Salameh;K. Cumanan;Zhiguo Ding;O. Dobre
这封信认为，一个智能反射面（IRS）辅助多载波（MC）非正交多址（NOMA）系统，称为IRS辅助MC-NOMA系统的下行链路传输。由于IRS可用性的限制，在可用IRS单元的支持下，可以为有限数量的信道提供服务。因此，提出了一种竞争方法来为预期信道分配可用的IRS单元，并将每个信道中的用户分组（即，聚类）。为了验证所提出的竞争方法的有效性，功率最小化问题被认为是旨在最小化总发射功率，同时确保一组服务质量的要求。由于联合功率优化问题的非凸性，本文提出了一种简单的序贯凸近似算法来求解该问题，仿真结果表明，采用本文提出的IRS分配和分组方法的IRS辅助MC-NOMA系统在发射功率消耗方面优于随机IRS分配和分组方法。
This letter considers the downlink transmission of an intelligent reflecting surface (IRS)-aided multi-carrier (MC) non-orthogonal multiple access (NOMA) system, referred to as the IRS-aided MC-NOMA system. Due to the limitations on the availability of the IRS, a limited number of channels can be served with the support of the available IRS units. Therefore, a competitive approach is proposed to assign the available IRS units for the intended channels, and to group the users in each channel (i.e., clustering). To validate the effectiveness of the proposed competitive approaches, a power minimization problem is considered that aims to minimize the total transmit power while ensuring a set of quality-of-service requirements. Because of the non-convex nature of the joint power optimization problem, we develop a simple sequential convex approximation algorithm to solve it. Simulation results demonstrate that the IRS-aided MC-NOMA system with proposed IRS-assignment and grouping approaches outperforms the random IRS-assignment and grouping approaches regarding the transmit power consumption.