Reconfigurable Intelligent Surface Phase Control for Wireless Localization
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Solution Overview
Problem
Existing wireless localization techniques using reconfigurable intelligent surfaces face challenges in optimizing multipath-aided localization due to uncontrolled electromagnetic interactions and interference, which affect accuracy and resilience, especially in obstructed and crowded indoor environments.
Innovation Solution
A method that selects and controls reconfigurable intelligent surfaces to minimize a cost function based on position error bounds, ensuring optimal phase settings and spacing to reduce interference, using performance indicators like Fisher information and geometric dilution of precision, to refine user equipment position estimates iteratively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reconfigurable intelligent surfaces are used to enhance wireless localization through multipath components, then localization accuracy is improved, but interference between additional multipath components increases
Solution Approach 1:
The patent converts the harmful multipath interference into beneficial localization information by using reconfigurable intelligent surfaces to create controlled multipath components. The RIS elements reflect signals to generate additional multipath components that carry location-dependent information, transforming what was previously harmful interference into useful positioning data
Solution Approach 2:
The patent changes the phase parameters of RIS elements to optimize the characteristics of reflected signals. By adjusting phase shifts of individual RIS elements, the system controls the amplitude and phase of multipath components to maximize localization accuracy while minimizing interference, effectively managing the trade-off between utilizing multipath information and avoiding interference
2Reliability
If multiple reconfigurable intelligent surfaces are deployed to improve localization coverage, then localization resilience is enhanced, but interference between surfaces increases
Solution Approach 1:
The patent segments the deployment of reconfigurable intelligent surfaces by establishing minimum distance constraints between different RIS surfaces. This segmentation prevents excessive interaction and interference between multiple surfaces while maintaining sufficient coverage for localization resilience
Solution Approach 2:
The patent controls the phase parameters of each RIS surface independently to manage interference between surfaces. By adjusting phase shifts, the system optimizes the combined effect of multiple surfaces to enhance localization resilience while minimizing mutual interference
3Reliability
If reconfigurable intelligent surfaces are used in obstructed environments to maintain localization continuity, then localization availability is improved, but electromagnetic interference increases
Solution Approach 1:
The patent introduces reconfigurable intelligent surfaces as intermediary elements between the base station and user equipment in obstructed environments. These RIS surfaces act as mediators that reflect and redirect signals around obstacles, maintaining localization continuity while the controlled phase management prevents excessive electromagnetic interference
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy and continuity of user equipment wireless localization by optimizing the selection and phase control of reconfigurable intelligent surfaces, mitigating interference and improving positioning performance across various environments.
Implementation Method 1
K reconfigurable intelligent surfaces reflecting signal(s) transmitted between a base station and said user equipment
Data Source
AI summary
A method for optimizing user equipment wireless localization using K reconfigurable intelligent surfaces reflecting signal(s) transmitted between a base station and the user equipment, the method including, whatever an a priori position of the user equipment selecting at least one reconfigurable intelligent surface to activate among the K reconfigurable intelligent surfaces, determining phases of elements of the at least one reconfigurable intelligent surface, by minimizing a predetermined cost function, depending on the a priori position, and accounting for a predetermined position error bound of the user equipment, while ensuring that at most K reconfigurable intelligent surfaces are selected, ensuring that the minimum Euclidian distance between two consecutive selected reconfigurable intelligent surfaces of a predetermined configuration, is strictly higher than a predetermined value limiting interference between additional multipath components generated by the at least one reconfigurable intelligent surface.