Implementation of RIS Beam-Scanning Testbed and Performance Analysis in mmWave OFDM Systems 


Vol. 51,  No. 2, pp. 382-389, Feb.  2026
10.7840/kics.2026.51.2.382


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  Abstract

Reconfigurable Intelligent Surfaces (RIS) offer a low-power, programmable means to manipulate mmWave propagation by dynamically adjusting the phase of an array of passive elements. In this work, we develop and evaluate a 1-bit, 32×32 PIN-diode RIS equipped with an FPGA-based high-speed control board. We implement a codebook-based beam-scanning structure using a LabVIEW host and FPGA for rapid beam switching. We validate beam-steering performance using horn antennas and vector network analyzer, demonstrating precise near-and far-field pattern controls that closely match MATLAB simulations. Finally, we develop a LabVIEW-based 28 GHz end-to-end OFDM testbed and conduct link experiments, showing significant improvements in constellation quality and bit-error-rate (BER) under target beam conditions compared to non-focused conditions. These results confirm that RIS can effectively enhance mmWave OFDM communication links in practical scenarios.

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[IEEE Style]

J. Lee, S. W. Cho, K. W. Choi, "Implementation of RIS Beam-Scanning Testbed and Performance Analysis in mmWave OFDM Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 51, no. 2, pp. 382-389, 2026. DOI: 10.7840/kics.2026.51.2.382.

[ACM Style]

Jina Lee, Sung Woo Cho, and Kae Won Choi. 2026. Implementation of RIS Beam-Scanning Testbed and Performance Analysis in mmWave OFDM Systems. The Journal of Korean Institute of Communications and Information Sciences, 51, 2, (2026), 382-389. DOI: 10.7840/kics.2026.51.2.382.

[KICS Style]

Jina Lee, Sung Woo Cho, Kae Won Choi, "Implementation of RIS Beam-Scanning Testbed and Performance Analysis in mmWave OFDM Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 51, no. 2, pp. 382-389, 2. 2026. (https://doi.org/10.7840/kics.2026.51.2.382)
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pISSN : 1226 - 4717
eISSN : 2287 - 3880