Near-Field Codebook Design for IRS-Assisted mmWave Communication Systems

Garkisch M, Scheder A, Lotter S, Vossiek M, Schober R (2025)

Publication Type: Conference contribution

Publication year: 2025

Publisher: IEEE

City/Town: New York City

Pages Range: 4653-4658

Conference Proceedings Title: ICC 2025 - IEEE International Conference on Communications

Event location: Montreal

DOI: 10.1109/ICC52391.2025.11161606

Abstract

Large intelligent reflecting surfaces (IRSs) possess a large near-field (NF) range, which makes their configuration challenging. To reduce the potentially significant overhead associated with configuring these large IRSs, phase shift codebooks are a promising approach. However, most existing IRS codebooks focus on maximizing the beamforming gain of the IRS, rather than optimizing the signal-to-noise ratio (SNR) at the receiver, which is more critical to the quality of service (QoS). In this paper, we introduce an IRS codebook design that maximizes the minimum SNR within a target receiver volume by optimizing the IRS phase shifts. We observe that, in the considered NF range, maximizing the IRS reflection gain for the farthest surface of the target receiving volume is equivalent to maximizing the SNR within the entire volume. Based on this observation, we derive an analytical phase shift design, where each unit cell (UC) of the IRS focuses on a specific point. Next, we formulate a nonconvex optimization problem, for a second, improved codebook design, and find a local optimum for the minimum SNR based on sucessive convex approximation (SCA). The optimized design reveals a trade-off between the minimum SNR and the codebook size, while achieving excellent performance across the entire considered NF. Numerical evaluations show that both proposed designs outperform several baseline schemes from the literature.

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How to cite

APA:

Garkisch, M., Scheder, A., Lotter, S., Vossiek, M., & Schober, R. (2025). Near-Field Codebook Design for IRS-Assisted mmWave Communication Systems. In ICC 2025 - IEEE International Conference on Communications (pp. 4653-4658). Montreal, CA: New York City: IEEE.

MLA:

Garkisch, Moritz, et al. "Near-Field Codebook Design for IRS-Assisted mmWave Communication Systems." Proceedings of the ICC 2025 - IEEE International Conference on Communications, Montreal New York City: IEEE, 2025. 4653-4658.

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