An optimization method and device for an IRS-assisted wireless communication system

Abstract

The invention discloses a method and device for optimizing an IRS-assisted wireless communication system. The method comprises the steps of selecting a first preset number of reflection unit sets RUSat the preset position of an IRS; determining a channel time delay corresponding to each RUS in the first preset number of RUSs, estimating a reflection path length distance passing through each RUSbetween the wireless AP and UE based on the channel time delay corresponding to each RUS, and determining an initial estimation position of the UE by using a triangulation positioning method based on the reflection path length corresponding to each RUS; re-selecting a second preset number of RUSs taking the RUSs closest to and farthest from the initial estimated position of the UE as reference on the IRS, and re-estimating the position of the UE to obtain an optimized UE estimated position; with the channel difference corresponding to the RUS closest to the initial estimated position of theUE and the channel difference corresponding to the RUS farthest from the initial estimated position of the UE are maximum, so that the precision of the optimized estimated position of the UE is higher; and communicating based on the optimized UE position. According to the invention, the position of the UE can be accurately estimated, and the communication between the AP and the UE is optimized.

Description

technical field [0001] The present invention relates to the technical field of 5G wireless communication, and more specifically, to an optimization method and device for an IRS-assisted wireless communication system. Background technique [0002] In the field of 5G wireless communication, because the transmission of high-frequency signals (such as millimeter waves or terahertz waves) is easily blocked by obstacles, the effect of wireless communication is not good. In order to solve this problem, there is an idea: through a specially manufactured low-cost, passive, reflective, reconfigurable smart surface (Metasurface / LIS / Large Intelligent Surface / Reconfigurable reflectarrays / Intelligent walls / Software-controlled metasurfaces / Intelligent Reflecting Surface / IRS, hereinafter are expressed by IRS), especially when the wireless access point AP (Access Point) and the user equipment UE (User Equipment) cannot communicate directly, they can communicate through the AP-IRS-UE channel...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to solve the problem that when the position of the UE is constantly changing in the prior art, the error of the RUS in estimating the position of the UE is large, resulting in the reflection coefficient matrix not being the most suitable matrix, and the communication effect between the AP and the UE. suboptimal technical issues

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