Fluid antenna represents a concept where a mechanically flexible antenna can switch its location freely within a given space. Recently, it has been reported that even with a tiny space, a single-antenna fluid antenna system (FAS) can outperform an L-antenna maximum ratio combining (MRC) system in terms of outage probability if the number of locations (or ports) the fluid antenna can be switched to, is large enough. This letter aims to study if extraordinary capacity can also be achieved by FAS with a small space. We do this by deriving the ergodic capacity, and a capacity lower bound. This letter also derives the level crossing rate (LCR) and average fade duration (AFD) for the FAS.
@article{arxiv.2005.13737,
title = {Performance Limits of Fluid Antenna Systems},
author = {Kai-Kit Wong and Arman Shojaeifard and Kin-Fai Tong and Yangyang Zhang},
journal= {arXiv preprint arXiv:2005.13737},
year = {2020}
}