Statistical CSI-Based Weighted Sum-Rate Maximization for Fluid Antenna-Aided Multiuser Communications
Yijia Li, Shuaixin Yang, Yue Xiao, Xianfu Lei, Ming Bo Xiao · IEEE Wireless Communications Letters · 2025
This letter focuses on the ergodic downlink weighted sum-rate (WSR) maximization in a fluid antenna (FA)-aided multiuser multiple-input multiple-output (MIMO) system. In contrast to most previous works on FA, we assume that the base station (BS) has only statistical channel state information (CSI), and then the transmit beamformer and the antenna positions are jointly optimized. The formulated non-convex problem is solved through an alternating optimization (AO) framework, involving the fractional programming (FP) and successive convex approximation (SCA) techniques. Moreover, by introducing the planar movement mode for the antennas, a low-complexity design is provided as an alternative. Numerical results validate the superiority of the proposed FA-aided system over its fixed-position antenna (FPA) counterpart.