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面向服务质量的RIS辅助的多用户NOMA系统功率分配方案

季薇 赵亚楠 刘子卿 李汀 梁彦 宋云超 李飞

季薇, 赵亚楠, 刘子卿, 李汀, 梁彦, 宋云超, 李飞. 面向服务质量的RIS辅助的多用户NOMA系统功率分配方案[J]. 电子与信息学报, 2023, 45(10): 3603-3611. doi: 10.11999/JEIT220946
引用本文: 季薇, 赵亚楠, 刘子卿, 李汀, 梁彦, 宋云超, 李飞. 面向服务质量的RIS辅助的多用户NOMA系统功率分配方案[J]. 电子与信息学报, 2023, 45(10): 3603-3611. doi: 10.11999/JEIT220946
JI Wei, ZHAO Yanan, LIU Ziqing, LI Ting, LIANG Yan, SONG Yunchao, LI Fei. QoS-oriented Power Allocation Scheme for Multi-user NOMA System Assisted by RIS[J]. Journal of Electronics & Information Technology, 2023, 45(10): 3603-3611. doi: 10.11999/JEIT220946
Citation: JI Wei, ZHAO Yanan, LIU Ziqing, LI Ting, LIANG Yan, SONG Yunchao, LI Fei. QoS-oriented Power Allocation Scheme for Multi-user NOMA System Assisted by RIS[J]. Journal of Electronics & Information Technology, 2023, 45(10): 3603-3611. doi: 10.11999/JEIT220946

面向服务质量的RIS辅助的多用户NOMA系统功率分配方案

doi: 10.11999/JEIT220946
基金项目: 国家自然科学基金 (61871238)
详细信息
    作者简介:

    季薇:女,博士,教授,研究方向为无线通信与通信信号处理、智能信号处理等

    赵亚楠:男,硕士生,研究方向为NOMA系统中的资源分配

    刘子卿:男,硕士生,研究方向为RIS辅助的通信系统

    李汀:男,博士,副教授,研究方向为MIMO 技术、3D MIMO 技术、协作通信等

    梁彦:女,博士,副教授,研究方向为无线通信与移动通信

    宋云超:男,博士,副教授,研究方向为通信信号处理

    李飞:女,博士,教授,研究方向为量子智能计算、群智能和无线通信中的信号处理技术

    通讯作者:

    季薇 jiwei@njupt.edu.cn

  • 中图分类号: TN92

QoS-oriented Power Allocation Scheme for Multi-user NOMA System Assisted by RIS

Funds: The National Natural Science Foundation of China (61871238)
  • 摘要: 可重构智能超表面(RIS)可被视为通信网络中具有特殊功能的“中继”来配合非正交多址接入(NOMA)系统构建一种协同的信息传输方案。考虑到未来物联网(IoT)场景下不同用户设备对服务质量(QoS)的不同需求,该文提出一种RIS辅助的多用户NOMA通信系统模型,并针对两类用户(信息用户和能量用户)的QoS需求设计了一种基于迭代优化的功率分配方法。该方法通过联合设计RIS相移矩阵、基站端波束赋形以及NOMA系统串行干扰消除顺序来最小化系统的总发射功率,以全面减轻通信系统中基站的能耗负担。仿真结果表明,与无RIS的场景相比,RIS辅助的NOMA系统可有效减小基站的能耗;在有RIS的场景下,所提功率分配方法的能耗明显低于RIS端随机选择相位的方式和基站端直接采用迫零波束赋形的方式。
  • 图  1  系统模型

    图  2  RIS元素个数与算法迭代次数图

    图  3  RIS元素个数和基站发射功率图

    图  4  基站天线数目和基站发射功率关系图

    图  5  不同用户SINR门限值和基站发射功率关系图

    算法1 基于半正定松弛的迭代优化算法
     步骤1 通过解决问题P2确定SIC解调顺序$ \{ s(k)\} $
     步骤2 基站端主动波束赋形、RIS端无源波束赋形优化
     (1)初始化${\left\{ { {\boldsymbol{W} } }_{k}\right\} }^{(0)},\;{\left\{ {\theta }_{m}\right\} }^{(0)}$,令$ r = 0,\varepsilon = {10^{ - 3}} $
     (2)在给定RIS相移矩阵$ {\{ {\theta _m}\} ^{(r)}} $的前提下,解决问题P3,并获得基站端的有源波束赋形向量$ {\{ {{\boldsymbol{W}}_k}\} ^{(r + 1)}} $
     (3)在给定基站波束赋形向量$ {\{ {{\boldsymbol{W}}_k}\} ^{(r + 1)}} $的前提下,解决问题P5,并获得RIS端的无源波束赋形向量$ {\{ {\theta _m}\} ^{(r + 1)}} $
     (4)更新r=r+1
     (5)问题目标值的下降低于阈值$ \varepsilon $,跳出循环;
     (6)重复步骤2中的(2)~(5)
      返回SIC解调顺序,基站端有源波束赋形向量,RIS端相移矩阵
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-07-13
  • 修回日期:  2023-01-20
  • 网络出版日期:  2023-02-04
  • 刊出日期:  2023-10-31

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