AI-Driven Design of Stacked Intelligent Metasurfaces for Software-Defined Radio Applications

TL;DR

This paper introduces a differentiable, GPU-accelerated simulation framework for stacked intelligent metasurfaces integrated into AI-driven software-defined radio systems, enabling adaptive beamforming and dynamic reconfiguration for 6G wireless communication.

Contribution

It presents a novel implementation of a SIM model within NVIDIA's Sionna framework, facilitating end-to-end learning and optimization of intelligent metasurface-assisted communication channels.

Findings

Effective simulation of SIM-assisted channels in GPU environments.

Successful end-to-end training for adaptive beamforming.

Benchmark results demonstrate improved control in NTN environments.

Abstract

The integration of reconfigurable intelligent surfaces (RIS) into future wireless communication systems offers promising capabilities in dynamic environment shaping and spectrum efficiency. In this work, we present a consistent implementation of a stacked intelligent metasurface (SIM) model within the NVIDIA's AI-native framework Sionna for 6G physical layer research. Our implementation allows simulation and learning-based optimization of SIM-assisted communication channels in fully differentiable and GPU-accelerated environments, enabling end-to-end training for cognitive and software-defined radio (SDR) applications. We describe the architecture of the SIM model, including its integration into the TensorFlow-based pipeline, and showcase its use in closed-loop learning scenarios involving adaptive beamforming and dynamic reconfiguration. Benchmarking results are provided for various deployment scenarios, highlighting the model's effectiveness in enabling intelligent control and signal enhancement in non-terrestrial-network (NTN) propagation environments. This work demonstrates a scalable, modular approach for incorporating intelligent metasurfaces into modern AI-accelerated SDR systems and paves the way for future hardware-in-the-loop experiments.