FAS-RIS: A Block-Correlation Model Analysis Lai, Xiazhi Morales-Jimenez, David Senior Member IEEE Fellow Fluid antenna system (FAS) Outage probability Reconfigurable Intelligent Surface (RIS) In this correspondence, we analyze the performance of a reconfigurable intelligent surface (RIS)-aided communication system that involves a fluid antenna system (FAS)-enabled receiver. By applying the central limit theorem (CLT), we derive approximate expressions for the system outage probability when the RIS has a large number of elements. Also, we adopt the block-correlation channel model to simplify the outage probability expressions, reducing the computational complexity and shedding light on the impact of the number of ports. Numerical results validate the effectiveness of our analysis, especially in scenarios with a large number of RIS elements. Index Terms-Fluid antenna system (FAS), outage probability, reconfigurable intelligent surface (RIS). 2025-03-06T08:37:02Z 2025-03-06T08:37:02Z 2024-08-24 journal article Xiazhi Lai et al. FAS-RIS: A Block-Correlation Model Analysis. https://doi.org/10.48550/arXiv.2408.13444 https://hdl.handle.net/10481/102890 10.48550/arXiv.2408.13444 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional IEEE