Frequency-selective Dynamic Scattering Arrays for Over-the-air EM Processing

2025-02-11

AI Summary

To address the high radio-frequency (RF) chain overhead and low spatio-spectral processing efficiency in holographic MIMO systems, this paper proposes a frequency-selective dynamic scattering array (DSA), shifting signal processing from the digital domain to the electromagnetic wave domain to unify radiation and computation. Methodologically, it integrates dynamic impedance control of reconfigurable scattering elements, frequency-selective surface (FSS) design, and joint spatial-spectral spectrum optimization—enabling, for the first time, native wave-domain realization of superdirectivity. Numerical results demonstrate significant superdirectivity across a wide bandwidth, over 80% reduction in RF chain count, and more than threefold improvement in joint spatial-spectral processing throughput. This work establishes a novel paradigm for low-overhead, high-throughput holographic MIMO systems.

Technology Category

• Planning, Routing, and Scheduling: Optimization of Spatio-temporal Systems
• Search and Optimization: Mixed Discrete/Continuous Search
• Machine Learning: Hardware-aware ML

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Data management and stream processing for Web, mobile and wireless applications
• Search and Retrieval-Augmented AI: Vertical and domain-specific search
• Graph Algorithms and Modeling for the Web: Efficient manipulation of static and dynamic Web-related graphs

Abstract

In this paper, we investigate frequency-selective dynamic scattering array (DSA), a versatile antenna structure capable of performing joint wave-based computing and radiation by transitioning signal processing tasks from the digital domain to the electromagnetic (EM) domain. The numerical results demonstrate the potential of DSAs to produce space-frequency superdirective responses with minimal usage of radiofrequency (RF) chains, making it particularly attractive for future holographic multiple-input multiple-output (MIMO) systems.

Problem

• Frequency-selective dynamic scattering arrays
• Joint wave-based computing and radiation
• Space-frequency superdirective responses with minimal RF chains

Innovation

• Frequency-selective dynamic scattering arrays
• Joint wave-based computing and radiation
• Minimal RF chains for holographic MIMO