Wong, KK;
Morales-Jimenez, D;
Tong, KF;
Chae, CB;
(2023)
Slow Fluid Antenna Multiple Access.
IEEE Transactions on Communications
10.1109/TCOMM.2023.3255904.
(In press).
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Abstract
Fluid antennas offer a novel way to achieve massive connectivity by enabling each user to find a ‘port’ in space where the instantaneous interference undergoes a deep null for multiple access. While this unprecedented capability permits hundreds of users to share the same radio channel, each user needs to switch its best port on a symbol-by-symbol basis, which is impractical. Motivated by this, this paper considers the scenario in which the fluid antenna of each user updates its best port only if the fading channel changes. We refer to this approach as <italic>slow</italic> fluid antenna multiple access (<italic>s</italic>-FAMA). In this paper, we first investigate the interference immunity of <italic>s</italic>-FAMA through analyzing the outage probability. Then an outage probability upper bound is obtained, from which we shed light on the achievable multiplexing gain of the system and unpack the impacts of various system parameters on the performance. Numerical results reveal that despite having a weaker multiplexing power than the symbol-based, <italic>fast</italic> FAMA (i.e., <italic>f</italic>-FAMA), spatial multiplexing of 4 users or more is possible if the users’ fluid antennas have large numbers of ports.
| Type: | Article |
|---|---|
| Title: | Slow Fluid Antenna Multiple Access |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TCOMM.2023.3255904 |
| Publisher version: | https://doi.org/10.1109/TCOMM.2023.3255904 |
| 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: | Antennas , Power system reliability , Transmitting antennas , Fading channels , Switches , NOMA , Downlink |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science 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/10167298 |
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