arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2207.00799eess.SPcs.ITmath.IT
收藏

基于电磁传播模型的近场定位 Cramér-Rao 界

Cramér-Rao Bounds of Near-Field Positioning Based on Electromagnetic Propagation Model

Ang Chen, Li Chen, Yunfei Chen, Changsheng You, Guo Wei, F. Richard Yu

AI总结:

本文将近场定位模型从经典球面波前模型改进为更准确的电磁传播模型,推导并验证了不同电场类型与多天线系统下的 Cramér-Rao 界。

摘要:

在 5G 之后的无线网络中,高频段大规模天线阵列的采用被广泛预见。这导致了近场区域的出现,其中波前不再是平面而是球面,为通信和定位带来了新的机遇与挑战。在本文中,我们将近场定位技术从经典的球面波前模型(SWM)改进为更准确、更真实的电磁传播模型(EPM)。基于完整的 EPM,开发了一种针对三种电场类型(矢量、标量和整体标量电场)具有不同观测能力的通用近场定位模型。对于这三种观测到的电场类型,采用 Cramér-Rao 界(CRB)来评估可达到的估计精度。通过将电磁传播概念与估计理论相结合,推导了不同电场观测的 CRB 表达式。当假设终端位于接收天线表面的中心垂线(CPL)上时,可进一步获得闭式表达式。此外,上述讨论被扩展到具有多个接收天线的系统。在这种情况下,推导了使用各种电场类型的 CRB,并深入研究了不同接收天线数量的影响。提供了数值结果以量化 CRB 并验证分析结果。同时,评估了不同系统参数的影响,包括电场类型、波长、接收天线尺寸和天线数量。

英文摘要:

The adoption of large-scale antenna arrays at high-frequency bands is widely envisioned in the beyond 5G wireless networks. This leads to the near-field regime where the wavefront is no longer planar but spherical, bringing new opportunities and challenges for communications and positioning. In this paper, we improve the near-field positioning technology from the classical spherical wavefront model (SWM) to the more accurate and true electromagnetic propagation model (EPM). A generic near-field positioning model with different observation capabilities for three electric field types (vector, scalar, and overall scalar electric field) is developed based on the complete EPM. For these three observed electric field types, the Cramér-Rao bound (CRB) is adopted to evaluate the achievable estimation accuracy. The expressions of the CRBs for different electric field observations are derived by combining electromagnetic propagation concepts with estimation theory. Closed-form expressions can be further obtained as the terminal is assumed to be on the central perpendicular line (CPL) of the receiving antenna surface. Moreover, the above discussions are extended to the system with multiple receiving antennas. In this case, the CRBs using various electric field types are derived, and the effect of different numbers of receiving antennas is deeply investigated. Numerical results are provided to quantify the CRBs and validate the analytical results. Also, the impact of different system parameters, including electric field type, wavelength, size of the receiving antenna, and number of antennas, is evaluated.

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。

↑