多通道STAR IRS辅助的NOMA系统用户分组方案研究
On user grouping for multi carrier STAR IRS aided NOMA systems
  
DOI:
中文关键词:  智能反射面;非正交多址;资源分配;同时透射和反射
英文关键词:intelligent reflecting surface; non orthogonal multiple access; resource allocation; simultaneously transmitting and reflecting(STAR)
基金项目:国家自然科学基金(62171237)资助项目
作者单位
王培宇 南京邮电大学 通信与信息工程学院,江苏 南京 210003 
王 鸿 南京邮电大学 通信与信息工程学院,江苏 南京 210003 
马昊淳 南京邮电大学 通信与信息工程学院,江苏 南京 210003 
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中文摘要:
      同时透射和反射的智能反射面(Simultaneously Transmitting and Reflecting Intelligent Reflecting Surface, STAR IRS)被视为第六代移动通信的革新性技术。文中研究了STAR IRS辅助的上行非正交多址接入(Non Orthogonal Multiple Access, NOMA)系统中用户与子信道配对问题,通过对用户合理分组与相移矩阵优化使得系统和速率最大。首先,根据系统和速率表达式,提出了一种低复杂度的用户分组方案,通过最大化级联信道增益,解决用户初始分组和解码顺序问题;其次,在满足每个用户传输速率的约束下,为了进一步提升系统和速率,交替优化相移矩阵和分组方案。仿真结果表明,与其他基准方案相比,文中提出的用户与子信道配对方案可以有效提高系统的和速率性能。
英文摘要:
      Simultaneously transmitting and reflecting intelligent reflecting surface (STAR IRS) is regarded as a revolutionary technology for the sixth generation (6G) mobile communication networks. This paper investigates the pairing scheme between the channels and the users for uplink transmission of STAR IRS aided non orthogonal multiple access (NOMA) systems. The system sum rate is maximized by carefully designing user grouping and optimizing the phase shift matrix of STAR IRS. First, based on the expression of the system sum rate, a user grouping scheme is proposed with low complexity. Furhter, by maximizing the sum of the combined channel gains, the initial grouping scheme of users and the decoding order are developed. Second, in order to improve the sum rate under the constraint of each user’s transmission rate,an alternating method is developed to optimize the phase shift matrix of STAR IRS and the user grouping scheme., Simulation results show that compared with various benchmarks, the proposed user and sub channel pairing scheme is capable of enhancing the sum rate of STAR IRS assisted NOMA system.
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