Stacked Intelligent Metasurface-Assisted Fluid Antenna Systems: Outage Probability

TL;DR

This paper introduces a joint SIM-FAS communication model, deriving a closed-form outage probability expression and optimizing phase shifts to enhance performance, validated by numerical results.

Contribution

It presents a novel joint SIM-FAS model with a closed-form outage probability and optimized phase shifts, advancing wave and spatial signal manipulation techniques.

Findings

Analytical outage probability expression accurately predicts system performance.

Optimized SIM phase shifts significantly reduce outage probability.

Numerical results show substantial gains over benchmark schemes.

Abstract

Stacked intelligent metasurfaces (SIMs) and fluid antenna systems (FAS) are emerging technologies for wave-domain and spatial signal manipulation, respectively.This letter proposes a novel joint SIM-FAS communication model in which transmission and reception are performed by a SIM and an FAS, respectively. Using the block-diagonal matrix approximation (BDMA), a closed-form expression for the outage probability is derived, and the SIM phase shifts are optimized to minimize outage. Numerical results validate the analytical accuracy and demonstrate substantial performance gains over conventional benchmark schemes.