  In this paper, we investigate the problem of resource allocation for fluid
antenna relay (FAR) system with antenna location optimization. In the
considered model, each user transmits information to a base station (BS) with
help of FAR. The antenna location of the FAR is flexible and can be adapted to
dynamic location distribution of the users. We formulate a sum rate
maximization problem through jointly optimizing the antenna location and
bandwidth allocation with meeting the minimum rate requirements, total
bandwidth budget, and feasible antenna region constraints. To solve this
problem, we obtain the optimal bandwidth in closed form. Based on the optimal
bandwidth, the original problem is reduced to the antenna location optimization
problem and an alternating algorithm is proposed. Simulation results verify the
effectiveness of the proposed algorithm and the sum rate can be increased by up
to 125% compared to the conventional schemes.
