Wong, Kai‐Kit;
Tong, Kin‐Fai;
Chen, Yu;
Zhang, Yangyang;
(2022)
Extra‐large MIMO enabling slow fluid antenna massive access for millimeter‐wave bands.
Electronics Letters
, 58
(25)
pp. 1016-1018.
10.1049/ell2.12662.
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Abstract
Fluid antenna multiple access (FAMA) is a new way of accommodating a large number of users on a single channel for massive connectivity, with slow FAMA (s-FAMA) being the practical version for achieving this. The impressive performance is understood to be achievable if the users have independent Rayleigh fading envelopes. With mobile networks vamping up the operating frequencies in 5G and beyond, nevertheless, the channel will have less multipath and become more directional. It is unclear if s-FAMA still performs well and how its performance is affected by different channel parameters. To address this, this letter first develops a multipath fading channel model capable of modelling a mixture of directional line-of-sight (LoS) and non-LoS paths over the ports of a fluid antenna system. The results indicate that a large number of paths in the channel is essential to the performance and a large Rice factor will degrade the performance rapidly. Also, contrast to the initial belief, the size of the fluid antenna plays a more important role than the number of ports or resolution of the fluid antenna. To restore the gain of s-FAMA, it is proposed to employ extra-large multiple-input multiple-output (XL-MIMO) at the base station (BS) to scramble the channel and create artificial multipath so that the users' envelopes can become independent Rayleigh again. The results confirm that XL-MIMO enabling s-FAMA is an effective technique for massive connectivity in the directional millimeter-wave (mmWave) bands.
| Type: | Article |
|---|---|
| Title: | Extra‐large MIMO enabling slow fluid antenna massive access for millimeter‐wave bands |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1049/ell2.12662 |
| Publisher version: | https://doi.org/10.1049/ell2.12662 |
| Language: | English |
| Additional information: | © 2022 The Authors. Electronics Letters published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| 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/10159698 |
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