Double-reconfigurable intelligent surface-assisted millimeter wave single base station positioning method

Abstract

The invention discloses a double-reconfigurable intelligent surface-assisted millimeter wave single base station positioning method, and belongs to the technical field of wireless positioning. The method comprises the steps: firstly, obtaining estimated angle information through angle estimation and collecting and summarizing by a BS side; selecting a proper RIS from two RISs according to the estimated angle information and path fading information for auxiliary positioning; and designing the phase shift of the RIS, then enabling a positioning reference signal sent by UE to reach BS through a direct path and a reflection path, solving a cross-correlation function of the two paths by the BS to obtain a path delay inequality, and further estimating the position of the UE, wherein the direct path represents the path from the UE to the BS, and the reflection path represents the path from the UE to the RIS plus the path from the RIS to the BS. According to the method, RIS auxiliary positioning is utilized, and positioning of the user equipment can be completed only through one base station; requirements on UE antenna configuration and software and hardware levels are extremely low, onlyextremely little calculation complexity is increased, and a positioning blind area of a community is effectively eliminated.

Description

technical field [0001] The invention relates to a millimeter wave single base station positioning method, in particular to a millimeter wave single base station positioning method assisted by dual reconfigurable smart surfaces, belonging to the technical field of wireless positioning. Background technique [0002] With the popularization of wireless communication networks and the continuous upgrading of mobile communication equipment configurations, positioning, tracking and navigation technologies have attracted more and more researchers and engineers, especially cellular network operators. This is due to the increasing demand for network planning and optimization in modern mobile communications, such as identifying traffic hot spots (that is, congested areas with insufficient network capacity during peak hours) and areas with poor coverage conditions, and analyzing the root causes of user call failures or dropped calls reasons, etc., are critical to ensuring uninterrupted ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the limitation that the existing positioning method requires multiple base stations to achieve positioning and the single RIS assisted positioning method exists where the UE is located in the BS and RIS When the BS beam is on or near the line, it is difficult to distinguish the direct and reflected paths. When the UE is far away from the RIS, the signal strength of the reflected path is weak. A dual-reconfigurable smart surface-assisted millimeter-wave single-base station positioning is proposed. method, first select a suitable RIS from the two RIS for assisted positioning through the estimated angle information and path fading information, and design the phase shift of the RIS element, and then the positioning reference signal (Positioning Reference Signal, PRS) sent by the UE ) reaches the BS through the direct path and the reflected path, and the BS obtains the path delay difference by solving the cross-correlation function of the two paths, and then estimates the UE position

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