In conventional multiple-input multiple-output (MIMO) communication systems, the positions of antennas are fixed. To take full advantage of spatial degrees of freedom, a new technology called fluid antenna (FA) is proposed to obtain higher achievable rate and diversity gain. Most existing works on FA exploit instantaneous channel state information (CSI). However, in FA-assisted systems, it is difficult to obtain instantaneous CSI since changes in the antenna position will lead to channel variation. In this letter, we investigate a FA-assisted MIMO system using relatively slow-varying statistical CSI. Specifically, in the criterion of rate maximization, we propose an algorithmic framework for transmit precoding and transmit/receive FAs position designs with statistical CSI. Simulation results show that our proposed algorithm in FA-assisted systems significantly outperforms baselines in terms of rate performance.
@article{arxiv.2312.07895,
title = {Fluid Antenna-Assisted MIMO Transmission Exploiting Statistical CSI},
author = {Yuqi Ye and Li You and Jue Wang and Hao Xu and Kai-Kit Wong and Xiqi Gao},
journal= {arXiv preprint arXiv:2312.07895},
year = {2024}
}