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The flexibility and reconfigurability at the radio frequency (RF) front-endoffered by the fluid antenna system (FAS) make this technology promising forproviding remarkable diversity gains in networks with small and constraineddevices. Toward this direction, this letter compares the outage probability(OP) performance of non-diversity and diversity FAS receivers undergoingspatially correlated Nakagami-$m$ fading channels. Although the systemproperties of FAS incur in complex analysis, we derive a simple yet accurateclosed-form approximation by relying on a novel asymptotic matching method forthe OP of a maximum-gain combining-FAS (MGC-FAS). The approximation isperformed in two stages, the approximation of the cumulative density function(CDF) of each MGC-FAS branch, and then the approximation of the end-to-end CDFof the MGC-FAS scheme. With these results, closed-form expressions for the OPand the asymptotic OP are derived. Finally, numerical results validate ourapproximation of the MGC-FAS scheme and demonstrate its accuracy underdifferent diversity FAS scenarios.

Novel Expressions for the Outage Probability and Diversity Gains in Fluid Antenna System