Fluid antenna systems (FASs) have introduced a new paradigm for wireless system design by revealing how mutual correlation can be exploited to harvest inherent spatial diversity. While existing studies have mainly focused on one-sided FAS configurations, i.e., with FAS deployed at either the transmitter or the receiver, this work investigates the ergodic capacity of a jointly correlated dual-side FAS under statistical eigenmode transmission. Specifically, a jointly correlated dual-side channel model is developed, and the corresponding ergodic capacity together with a tight closed-form upper bound is derived. In addition, the optimal power allocation is studied, and a practical iterative algorithm is proposed for its implementation.

翻译：流体天线系统（FAS）通过揭示如何利用互相关性获取固有空间分集，为无线系统设计引入了新范式。现有研究主要关注单端FAS配置（即在发射端或接收端部署FAS），而本文研究了统计特征模传输下联合相关双端FAS的遍历容量。具体而言，建立了联合相关双端信道模型，推导了其遍历容量及紧致的闭式上界。此外，研究了最优功率分配问题，并提出了一种实用的迭代算法用于其实现。