Exploring Fairness for FAS-assisted Communication Systems: from NOMA to OMA
arxiv(2024)
摘要
This paper addresses the fairness issue within fluid antenna system
(FAS)-assisted non-orthogonal multiple access (NOMA) and orthogonal multiple
access (OMA) systems, where a single fixed-antenna base station (BS) transmits
superposition-coded signals to two users, each with a single fluid antenna. We
define fairness through the minimization of the maximum outage probability for
the two users, under total resource constraints for both FAS-assisted NOMA and
OMA systems. Specifically, in the FAS-assisted NOMA systems, we study both a
special case and the general case, deriving a closed-form solution for the
former and applying a bisection search method to find the optimal solution for
the latter. Moreover, for the general case, we derive a locally optimal
closed-form solution to achieve fairness. In the FAS-assisted OMA systems, to
deal with the non-convex optimization problem with coupling of the variables in
the objective function, we employ an approximation strategy to facilitate a
successive convex approximation (SCA)-based algorithm, achieving locally
optimal solutions for both cases. Empirical analysis validates that our
proposed solutions outperform conventional NOMA and OMA benchmarks in terms of
fairness.
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