RIS Signal Detection Circuit for Low-Cost Direction Sensing
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining high reliability and data transmission rates due to signal degradation from obstacles, and the installation of additional base stations and repeaters is inefficient due to high costs and restricted placement, while current radio wave direction detection circuits for reconfigurable intelligent surfaces are costly.
Innovation Solution
A signal detection circuit comprising a reconfigurable intelligent surface, a multiple input/output circuit, a magnitude detection circuit, and a processor, which reduces manufacturing costs by using lower-cost elements to detect the direction of incident radio waves, utilizing a sampling area and reflection area with unit cells to process and identify signal magnitude and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional base stations and repeaters are installed to overcome signal degradation, then wireless communication reliability is improved, but installation cost and complexity increase
Solution Approach 1:
A reconfigurable intelligent surface (RIS) is introduced as an intermediary component between the base station and user equipment. The RIS includes multiple unit cells that can be configured to reflect and steer radio waves along alternative paths, effectively mediating signal transmission in obstructed environments without requiring additional base stations or repeaters
Solution Approach 2:
The RIS is divided into multiple independently controllable unit cells arranged in a grid pattern. Each unit cell can be individually configured to control the phase and amplitude of reflected signals, allowing the surface to be segmented into different functional regions for beamforming and spatial filtering operations
2Measurement precision
If RF chain circuits are used to detect radio wave direction, then detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive RF chain circuits with a lens-based optical system. A lens is positioned behind the RIS to focus incident radio waves onto specific sensor elements, enabling direction detection through geometric optics rather than electronic signal processing, thereby significantly reducing manufacturing cost while maintaining detection accuracy
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
The proposed circuit effectively reduces manufacturing costs and enhances wireless communication performance by accurately identifying signal direction and optimizing beam steering, even with larger reconfigurable intelligent surfaces, without the need for high-cost RF chain circuits.
Implementation Method 1
a reconfigurable intelligent surface may adjust the phase of a reflected radio wave and may form a desired shape of beam by controlling the phase of a reflected wave
Implementation Method 2
when a lens is positioned behind the reconfigurable intelligent surface, an incidence direction of a radio wave may be identified
Data Source
AI summary
Provided are a signal detection circuit and a detection method using the signal detection circuit. The signal detection circuit includes a reconfigurable intelligent surface, a multiple input/output circuit connected to the reconfigurable intelligent surface, a magnitude detection circuit connected to the multiple input/output circuit, and a processor connected to the magnitude detection circuit, wherein the reconfigurable intelligent surface includes a sampling area arranged to intersect in a first direction and a second direction, the multiple input/output circuit is configured to receive and process a signal from the sampling area, the magnitude detection circuit is configured to receive the signal from the multiple input/output circuit and detect a magnitude of the received signal, and the processor is configured to identify an incidence direction of the signal based on a detection result of the magnitude detection circuit.