TY - JOUR PB - Institute of Electrical and Electronics Engineers (IEEE) JF - IEEE Transactions on Wireless Communications A1 - Ghadi, Farshad Rostami A1 - Wong, Kai-Kit A1 - Javier López-Martínez, F A1 - Chae, Chan-Byoung A1 - Tong, Kin-Fai A1 - Zhang, Yangyang KW - Fluid antenna system KW - arbitrary fading KW - correlation KW - Gaussian copula KW - SISO KW - outage probability N1 - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions. ID - discovery10197479 UR - https://doi.org/10.1109/TWC.2024.3454558 N2 - This paper investigates the performance of a single-user fluid antenna system (FAS), by exploiting a class of elliptical copulas to describe the dependence structure amongst the fluid antenna positions (ports). By expressing the well-known Jakes? model in terms of the Gaussian copula, we consider two cases: (i) the general case, i.e., any arbitrary correlated fading distribution; and (ii) the specific case, i.e., correlated Nakagami- m fading. For both scenarios, we first derive analytical expressions for the cumulative distribution function (CDF) and probability density function (PDF) of the equivalent channel in terms of multivariate normal distribution. Then we obtain the outage probability (OP) and the delay outage rate (DOR) to analyze the performance of FAS. By employing the popular rank correlation coefficients such as Spearman?s ? and Kendall?s ?, we measure the degree of dependency in correlated arbitrary fading channels and illustrate how the Gaussian copula can be accurately connected to Jakes? model in FAS. Our numerical results demonstrate that increasing the size of FAS provides lower OP and DOR, but the system performance saturates as the number of antenna ports increases. In addition, our results indicate that FAS provides better performance compared to conventional single-fixed antenna systems even when the size of fluid antenna is small. AV - public SN - 1536-1276 Y1 - 2024/// TI - A Gaussian Copula Approach to the Performance Analysis of Fluid Antenna Systems ER -