移动通信2025，Vol.49Issue(4)：28-33,6.DOI:10.3969/j.issn.1006-1010.20250217-0001
智能超表面辅助MIMO系统:单极化与双极化的选择
Intelligent Surface-Assisted MIMO System:Dual Polarization or Single Polarization
摘要
Abstract
In mobile communication systems,dual-polarized multiple-input multiple-output(DP-MIMO)technology significantly enhances spectral efficiency through polarization dimension multiplexing and diversity gain.However,due to the cross-polarization coupling effect in wireless polarization channels,the capacity of existing DP-MIMO systems cannot surpass the performance limit of single-polarized MIMO(SP-MIMO)architectures.Therefore,this paper proposes a joint polarization phase design scheme based on DP reconfigurable intelligent surfaces(DP-RISs)and systematically investigates the relationship between the surface size of DP-RIS and MIMO system capacity performance.Specifically,we establish a polarization channel model and derive a closed-form expression for the RIS-assisted DP/SP-MIMO system capacity under the optimal phase design.Based on this,we provide the size threshold at which DP system performance exceeds that of the SP system.Theoretical analysis and simulation results demonstrate that when the number of RIS elements exceeds this size threshold,DP-MIMO system can achieve a capacity advantage over SP-MIMO.The research conclusions offer key size design guidelines for the engineering deployment of DP-MIMO systems with RIS assistance.关键词
可重构智能超表面/双极化/多输入多输出系统Key words
reconfigurable intelligent surface/dual polarization/multiple-input-multiple-output system分类
电子信息工程引用本文复制引用
郑子洲,张泓亮,黄欢,王刚..智能超表面辅助MIMO系统:单极化与双极化的选择[J].移动通信,2025,49(4):28-33,6.基金项目
国家自然科学基金面上项目"面向近场的透射-反射可重构超表面辅助多用户传输技术"(62371011) （62371011）
国家自然科学基金青年科学基金项目"随机配置智能超表面的全无源干扰机制及其防御策略研究"(62401387) （62401387）
