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Fluid Antenna-aided Full Duplex Communications: A Macroscopic Point-Of-View
The synergy of fluid-based reconfigurable antenna (FA) technology and
full-duplex (FD) communications can be jointly beneficial, as FD can enhance
the spectral efficiency of a point-to-point link, while the new degree of
freedom offered by the FA technology can be exploited to handle the overall
interference. Hence, in this paper, an analytical framework based on stochastic
geometry is developed, aiming to assess both the outage and average sum-rate
performance of large-scale FA-aided FD cellular networks. In contrast to
existing studies, where perfect channel state information is assumed, the
developed framework accurately captures the impact of channel estimation (CE)
on the performance of the considered network deployments, as well as the
existence of residual loop-interference (LI) at the FD transceivers.
Particularly, we focus on a limited coherence interval scenario, where a novel
sequential linear minimum-mean-squared-error-based CE method is performed for
all FA ports and LI links, followed by data reception from the port with the
strongest estimated channel. By using stochastic geometry tools, analytical
expressions for the outage and the average sum-rate performance are derived.
Our results reveal that FA-aided FD communications experience an improved
average sum-rate performance of around 45\% compared to conventional FD
communications.Comment: 32 pages, 8 figure
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