摘要
可重构智能表面(reconfigurable intelligent surface,RIS,也称智能超表面)通过智能调控电磁传播路径,有效提高了6G通信系统的性能.然而,RIS集成大量反射单元使得多波束调控复杂度高、码本搜索空间大,导致实时调控能力不足,难以应用于多用户波束跟踪.为提升RIS在多用户移动场景的适用性,创新基于逆衍射的场源迭代模型,快速生成近远场多用户调控码本,设计RIS辅助单基站定位方案,感知用户移动位置实时切换波束.研制RIS辅助多用户波束跟踪系统原型,实现多用户移动过程中快速波束对准.试验结果表明,毫秒级波束切换可实现移动多用户的实时信息传输.
Abstract
Reconfigurable intelligent surface(RIS)effectively improves the performance of 6G communication sys-tems by intelligently controlling the electromagnetic propagation path.However,the integration of a large number of reflecting elements in RIS increases the complexity of multi-beam control and enlarges the codebook search space,leading to insufficient real-time control capabilities and difficulties in multi-user beam tracking.To enhance the appli-cability of RIS in multi-user mobile scenarios,an innovative inverse diffraction-based field source iterative model was proposed to rapidly generate near-and far-field multi-user control codebooks.A RIS-assisted single base station posi-tioning scheme was designed to sense the movement of users and switch beams in real-time.A prototype of a RIS-assisted multi-user beam tracking system was developed,enabling fast beam alignment during multi-user mobility.Experimental results show that millisecond-level beam switching can achieve real-time information transmission for mobile multi-users.
维普
万方数据