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Reflection Coefficient Measurement Method for Reconfigurable Intelligent Surface Based on Harmonic Analysis
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DOI：10.1109/LAWP.2025.3629144.png)
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Abstract
En 中文
Accurate characterization of the reflection coefficient of reconfigurable intelligent surface (RIS) is crucial for the design and optimization of RIS-assisted communication systems. Conventional measurement methods often rely on specialized instruments, which are costly and bulky. In this letter, we propose a novel harmonic-based reflection coefficient measurement method that enables in-situ and low-cost measurement using standard software-defined radio platform. By applying time-varying square-wave control signals to the RIS, the proposed method can obtain the amplitude ratio and the phase difference between two reflection states through harmonic analysis of the reflected signal. A prototype system is developed and experimentally validated, demonstrating that the proposed method achieves comparable measurement results to that of conventional approaches while significantly reducing hardware complexity.
Keywords:
Reflection coefficient
Harmonic analysis
Wireless communication
Reconfigurable intelligent surfaces
Time measurement
Reflection
Receiving antennas
Hardware
Transmitting antennas
Time-domain analysis
Experimental measurement
harmonic analysis
reconfigurable intelligent surface (RIS)
reflection coefficient
Journal
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Citations:
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