Optimal Antenna Configuration Filtering and Joint Power Control for Throughput Maximization in Fluid Antenna Multiple Access Networks

Globecom, pp. 642–647

Abstract

This work investigates a fluid antenna multiple access (FAMA) system, in which a base station (BS) with multiple fluid antennas serves multiple users, each also equipped with fluid antennas. With the objective of fairness-aware throughput maximization, we propose an optimal joint antenna configuration and resource allocation design, incorporating transmit power control alongside BS antenna assignment and port selection for all active fluid antennas. The antenna assignment and port selection introduce numerous discrete variables, resulting in a mixed-integer nonlinear problem, thus significantly complicating the joint optimization. To address these challenges without compromising optimality, we develop a novel methodology for globally optimal FAMA design. Specifically, we first characterize the optimal power control with a given antenna configuration, which enables the formulation of a system of equations and inequalities (SEI) to assess the achievability of any throughput level. A fixpoint-based inference approach is then developed to determine SEI solvability, facilitating the iterative filtering of nonoptimal configurations. The globally optimal FAMA design is finally achieved by through optimal power control associated with the best antenna configuration. Finally, numerical results validate the global optimality and the high benefits of our proposed design.

Authors 5

1. Ning Guo

   Wuhan University

   Affiliation as printed

   Wuhan University,School of Electronic Information,China

2. Xiaopeng Yuan Aachen INDA Chair

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University,INDA Chair,Germany

3. Yulin Hu

   Wuhan University

   Affiliation as printed

   Wuhan University,School of Electronic Information,China

4. Robert Schober

   Friedrich-Alexander-Universität Erlangen-Nürnberg

   Affiliation as printed

   Friedrich-Alexander-University Erlangen-Nürnberg (FAU),Germany

5. Anke Schmeink Aachen INDA Chair

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University,INDA Chair,Germany