Fluid antenna-aided rate-splitting multiple access
Fluid antenna-aided rate-splitting multiple access
This letter considers a fluid antenna system (FAS)-aided rate-splitting multiple access (RSMA) approach for downlink transmission. In particular, a base station (BS) equipped with a single traditional antenna system (TAS) uses RSMA signaling to send information to several mobile users (MUs) each equipped with FAS. To understand the achievable performance, we first present the distribution of the equivalent channel gain based on the joint multivariate t-distribution and then derive a compact analytical expression for the outage probability (OP). Moreover, we obtain the asymptotic OP in the high signal-to-noise ratio(SNR) regime. Numerical results show that combining FAS with RSMA significantly outperforms TAS and conventional multiple access schemes, such as non-orthogonal multiple access (NOMA),in terms of OP. The results also indicate that FAS can be the tool that greatly improves the practicality of RSMA.
Ghadi, Farshad Rostami
4e46e4a3-5737-4a86-a1b0-bbdc7b9a8068
Wong, Kai-Kit
bb7395be-1830-4de8-b714-8dca2b8e6979
López-Martínez, F. Javier
196c23e5-7817-406f-b39f-f2c19ddd9fcf
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Chae, Chan Byoung
90d9c9fb-2f07-476d-86a4-b8c6e45fe5c1
Ghadi, Farshad Rostami
4e46e4a3-5737-4a86-a1b0-bbdc7b9a8068
Wong, Kai-Kit
bb7395be-1830-4de8-b714-8dca2b8e6979
López-Martínez, F. Javier
196c23e5-7817-406f-b39f-f2c19ddd9fcf
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Chae, Chan Byoung
90d9c9fb-2f07-476d-86a4-b8c6e45fe5c1
Ghadi, Farshad Rostami, Wong, Kai-Kit, López-Martínez, F. Javier, Hanzo, Lajos and Chae, Chan Byoung
(2025)
Fluid antenna-aided rate-splitting multiple access.
IEEE Transactions on Vehicular Technology.
(In Press)
Abstract
This letter considers a fluid antenna system (FAS)-aided rate-splitting multiple access (RSMA) approach for downlink transmission. In particular, a base station (BS) equipped with a single traditional antenna system (TAS) uses RSMA signaling to send information to several mobile users (MUs) each equipped with FAS. To understand the achievable performance, we first present the distribution of the equivalent channel gain based on the joint multivariate t-distribution and then derive a compact analytical expression for the outage probability (OP). Moreover, we obtain the asymptotic OP in the high signal-to-noise ratio(SNR) regime. Numerical results show that combining FAS with RSMA significantly outperforms TAS and conventional multiple access schemes, such as non-orthogonal multiple access (NOMA),in terms of OP. The results also indicate that FAS can be the tool that greatly improves the practicality of RSMA.
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Accepted/In Press date: 13 August 2025
Identifiers
Local EPrints ID: 505020
URI: http://eprints.soton.ac.uk/id/eprint/505020
ISSN: 0018-9545
PURE UUID: 61d556b4-721f-4268-9f4d-ad81404b45ff
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Date deposited: 24 Sep 2025 16:33
Last modified: 25 Sep 2025 01:33
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Contributors
Author:
Farshad Rostami Ghadi
Author:
Kai-Kit Wong
Author:
F. Javier López-Martínez
Author:
Lajos Hanzo
Author:
Chan Byoung Chae
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