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arXiv 2302.12459eess.SP
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多RIS支持的3D侧行链路定位

Multi-RIS-Enabled 3D Sidelink Positioning

Hui Chen, Pinjun Zheng, Musa Furkan Keskin, Tareq Al-Naffouri, Henk Wymeersch

AI总结:

针对无基站环境下智能交通系统的定位难题,提出利用多个RIS辅助UE间侧行链路通信实现3D定位的两阶段算法,并通过仿真验证其高精度及消除盲区的方案。

摘要:

定位预计将成为智能交通系统(ITS)中的核心功能,以支持通信和基于位置的服务,如自动驾驶、交通控制等。随着低成本反射式可重构智能表面(RIS)在超5G/6G网络中的部署,具有高角度分辨率的额外锚点可以提升信号质量,并使在ITS场景中实现高精度、扩展覆盖的定位成为可能。然而,RIS的无源特性需要基站(BS)等信号源,这限制了在极端情况下的定位服务,例如隧道或密集城区,在这些地方5G/6G基站无法接入。在这项工作中,我们展示了在(至少)两个RIS的辅助以及两个用户设备(UE)之间的侧行链路通信下,这些UE甚至可以在没有任何基站参与的情况下被定位。提出了一种两阶段3D侧行链路定位算法,并以推导的克拉美-罗界为基准进行了评估。评估了多径和RIS配置设计对定位性能的影响,并讨论了几种不同RIS和UE位置的场景以进行可定位性分析。仿真结果证明了所提出的无基站侧行链路通信系统在具有挑战性的ITS场景中具有有前景的定位精度。此外,我们提出并评估了几种消除潜在定位性能差的盲区的解决方案,例如通过往返通信消除时钟偏移、添加几何先验或约束,以及引入更多RIS。

英文摘要:

Positioning is expected to be a core function in intelligent transportation systems (ITSs) to support communication and location-based services, such as autonomous driving, traffic control, etc. With the advent of low-cost reflective reconfigurable intelligent surfaces (RISs) to be deployed in beyond 5G/6G networks, extra anchors with high angular resolutions can boost signal quality and makes high-precision positioning with extended coverage possible in ITS scenarios. However, the passive nature of the RIS requires a signal source such as a base station (BS), which limits the positioning service in extreme situations, such as tunnels or dense urban areas, where 5G/6G BSs are not accessible. In this work, we show that with the assistance of (at least) two RISs and sidelink communication between two user equipments (UEs), these UEs can be localized even without any BSs involvement. A two-stage 3D sidelink positioning algorithm is proposed, benchmarked by the derived Cramér-Rao bounds. The effects of multipath and RIS profile designs on positioning performance are evaluated, and several scenarios with different RIS and UE locations are discussed for localizability analysis. Simulation results demonstrate the promising positioning accuracy of the proposed BS-free sidelink communication system in challenging ITS scenarios. Additionally, we propose and evaluate several solutions to eliminate potential blind areas where positioning performance is poor, such as removing clock offset via round-trip communication, adding geometrical prior or constraints, as well as introducing more RISs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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