Stacked Intelligent Metasurface-Assisted Fluid Antenna Systems: Outage Probability
For wireless communication systems, this work combines two emerging technologies to improve outage performance, but the contribution is incremental as it applies existing methods to a new hybrid model.
The paper proposes a joint SIM-FAS communication model and derives a closed-form outage probability expression using BDMA, showing substantial performance gains over conventional benchmarks.
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.