| 摘要: |
| 智能反射面（Intelligent Reflecting Surface,IRS），也被称为可重构智能表面（Reconfigurable Intelligent Surface,RIS）或大型智能表面（Large Intelligent Surface,LIS），通过重新配置无线通信传输环境，可以有效提高通信质量。考虑IRS辅助的毫米波多输入多输出(Multiple-Input Multiple-Output,MIMO)下行系统，通过采用流形优化(Manifold Optimization,MO)技术处理，协同优化IRS的无源波束成形、功率分配、预编码矩阵以及合并矩阵，以最大化多用户和速率。由于利用流形优化算法设计的最佳目标函数是非凸的，因此利用毫米波级联信道的内在结构，将非凸问题转换为更加容易处理的问题。仿真结果表明，所采用的MO方案能获得比最小均方误差(Minimum Mean Square Error,MMSE)方案以及随机相位方案更好的和速率性能。 |
| 关键词: 毫米波通信 多输入多输出（MIMO）系统 智能反射面(IRS) 流形优化 波束成形 |
| DOI：10.20079/j.issn.1001-893x.211117005 |
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| 基金项目:国家自然科学基金资助项目(61971081) |
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| Beamforming design of millimeter wave MIMO system assisted by intelligent reflecting surface |
| GE Zhongyi,YUE Dianwu,LI Guanghui,WEI Siyue,SU Yumiao |
| (School of Information Science and Technology,Dalian Maritime University,Dalian 116026,China) |
| Abstract: |
| Intelligent reflecting surface(IRS),also known as reconfigurable intelligent surface(RIS) or large intelligent surface(LIS),can effectively improve communication quality.In consideration of the IRS-assisted millimeter-wave multiple-input multiple-output(MIMO) downlink system,and through the use of manifold optimization(MO) technology processing,the passive beamforming,power allocation,precoding matrix and merging matrix of the IRS are collaboratively optimized to maximize multi-user sum-rate.Since the optimal objective function designed by the MO algorithm is non-convex,the internal structure of the millimeter-wave cascade channel is used to convert the non-convex problem into a problem easier to handle.The simulation results show that the adopted MO scheme can obtain better sum-rate performance than the minimum mean square error(MMSE) scheme and the random phase scheme. |
| Key words: millimeter wave communication multiple-input multiple-output(MIMO) system intelligent reflecting surface(IRS) manifold optimization beamforming |
