基于MM算法的智能反射面辅助NOMA系统协作传输方案设计  

MM⁃based transmission design for IRS⁃aided CoMP⁃NOMA systems

作　　者：过仕安 王鸿 GUO Shian;WANG Hong(College of Telecommunications&Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2021年第6期23-28,共6页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家自然科学基金(61801246)资助项目。

摘　　要：智能反射面(IRS)被视为第六代移动通信系统的尖端和革命性技术。文中研究了IRS辅助的协作多点与非正交多址接入(CoMP⁃NOMA)融合系统的上行发射功率最小化问题。具体地,将IRS部署在两小区的边缘,用于提升边缘用户的传输性能。为了解决提出的功率最小化问题,文中利用发射功率与相位偏移之间的关系,将功率分配和相位偏移联合优化问题转化为纯相移优化问题。然而,由于恒模约束,转化后的相移优化问题仍为非凸问题,因此,提出了一种基于MM算法的相移优化方案。仿真结果表明,在相同的测试条件下,所提出解决方案的传输功耗明显低于其他基准方案。The intelligent reflecting surface(IRS)is considered as cutting⁃edge and revolutionary technology for the sixth generation of mobile communication systems.The uplink power minimization problem of IRS⁃assisted coordinated multi⁃point non⁃orthogonal multiple access(CoMP⁃NOMA)systems is studied.Specifically,an IRS is deployed at the edge of two cells to enhance the transmission performance of cell⁃edge users.To solve the formulated power minimization problem,the joint optimization problem of the power allocation and the phase shift is converted into a pure phase shift determination problem by using the relationship between the power allocation and the phase shift.Because of the constraint of constant modulus,the phase shift optimization problem is still a non⁃convex problem.Based on minorization maximization(MM)algorithm,an efficient algorithm is proposed to optimize the phase shifts.Simulation results show that under the same testing conditions,the transmit power consumption of the scheme is less than that of various benchmarks.

关 键 词：非正交多址协同多点传输 智能反射面 最小最大化算法 相位偏移 

分 类 号：TN929.5[电子电信—通信与信息系统]