Huangfu, J;
Song, Z;
Hou, T;
Li, A;
Liu, Y;
Nallanathan, A;
Wong, KK;
(2025)
Performance Analysis of Fluid Antenna System under Spatially-Correlated Rician Fading Channels.
IEEE Transactions on Wireless Communications
10.1109/TWC.2025.3590722.
Preview |
Text
Performance_Analysis_of_Fluid_Antenna_System_under_Spatially-Correlated_Rician_Fading_Channels.pdf - Accepted Version Download (5MB) | Preview |
Abstract
Fluid antenna systems (FAS) are among the most promising technologies for the sixth generation (6G) mobile communication networks. Unlike traditional fixed-position multiple-input multiple-output (MIMO) systems, a FAS possesses position reconfigurability to switch on-demand among N predefined ports over a prescribed space. This paper explores the performance of a single-input single-output (SISO) model with a fixed-position antenna transmitter and a single-antenna FAS receiver, referred to as the Rx-SISO-FAS model, under spatially-correlated Rician fading channels. Our contributions include exact expressions and closed-form bounds for the outage probability of the Rx-SISO-FAS model, as well as exact and closed-form lower bounds for the ergodic rate. Importantly, we also analyze the performance considering both uniform linear array (ULA) and uniform planar array (UPA) configurations for the ports of the FAS. To gain insights, we evaluate the diversity order of the proposed model and our analytical results indicate that with a fixed overall system size, increasing the number of ports, N, significantly decreases the outage performance of FAS under different Rician fading factors. Our numerical results further demonstrate that: i) the Rx-SISO-FAS model can enhance performance under spatially-correlated Rician fading channels over the fixed-position antenna counterpart; ii) the Rician factor negatively impacts performance in the low signal-to-noise ratio (SNR) regime; iii) FAS can outperform an L branches maximum ratio combining (MRC) system under Rician fading channels; and iv) when the number of ports is identical, UPA outperforms ULA.
| Type: | Article |
|---|---|
| Title: | Performance Analysis of Fluid Antenna System under Spatially-Correlated Rician Fading Channels |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TWC.2025.3590722 |
| Publisher version: | https://doi.org/10.1109/twc.2025.3590722 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Fluid antenna system (FAS), ergodic rate, fixed-position MIMO, outage probability, Rician fading channels |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10214370 |
Archive Staff Only
 |
View Item |
