A New Analytical Approximation of the Fluid Antenna System Channel

Khammassi, Malek; Kammoun, Abla; Alouini, Mohamed‐Slim

doi:10.1109/twc.2023.3266411

Cited by 41 publications

(29 citation statements)

References 27 publications

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“…As a result, with the much improved tractability, we have preferred to adopt the generalized channel correlation model in [38]. We also note that [33] recently employed an accurate channel model in characterizing the spatial correlation among the ports but its tractability is very limited.…”

Section: System Model For F‐famamentioning

confidence: 99%

“…Recent research also studied fluid antenna systems in Nakagami channels [30], their diversity order [31] and level crossing rates [32]. Recently in [33], Khammassi et al. employed a fully correlated channel model that accurately characterizes the channel correlation between any two ports in a fluid antenna and reported that the system performance is affected more by the size of the antenna than the resolution.…”

Section: Introductionmentioning

confidence: 99%

“…While most efforts in fluid antenna communication systems are limited to single‐user scenarios, for example, [27–36], the fact that a position‐switchable fluid antenna can access the ups and downs of fading envelope of the interference can be exploited for multiple access. Specifically, a fluid antenna assisted UE is gifted with the ability to tune in to the window of opportunity in which the interference naturally disappears in a deep fade, without prior coordination nor advanced signal processing, all by a single radio frequency (RF)‐chain fluid antenna switching its port to the most desirable one.…”

Section: Introductionmentioning

confidence: 99%

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Maximizing the network outage rate for fast fluid antenna multiple access systems

et al. 2023

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Using reconfigurable fluid antennas, it is possible to have a software‐controlled position‐tuneable antenna to realize spatial diversity and multiplexing gains that are previously only possible using multiple antennas. Recent results illustrated that fast fluid antenna multiple access (f‐FAMA) which always tunes the antenna to the position for maximum signal‐to‐interference ratio (SIR) on a symbol‐by‐symbol basis, could support hundreds of users on the same radio channel, all by a single fluid antenna at each user without complex coordination and optimization. The network outage rate, nevertheless, depends on the SIR threshold chosen for each user. Motivated by this, this paper adopts a first‐order approximation to obtain the outage probability expression from which a closed‐form solution is derived for optimizing the SIR threshold in maximizing the network outage rate. Moreover, a closed‐form expression is provided to estimate the number of users in the f‐FAMA network in which the outage rate begins to plateau. Numerical results show that the proposed SIR threshold achieves near‐maximal outage rate performance.

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Section: System Model For F‐famamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Maximizing the network outage rate for fast fluid antenna multiple access systems

et al. 2023

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“…Digital Object Identifier 10.1109/XXX.2021.XXXXXXX Several works have been recently conducted to investigate the performance of FAS from various viewpoints, e.g., [5]- [9], [12]. The authors in [5] analyzed the ergodic capacity for a FAS under correlated Rayleigh fading channels, where they provided closed-form expressions of the capacity lower bound.…”

Section: Introductionmentioning

confidence: 99%

“…In [8], it was revealed that previous contributions may not accurately capture the correlation between the FAS ports. For this purpose, [9] proposed an eigenvalue-based model to approximate the spatial correlation given by Jake's model, where they illustrated that, under such model, the FAS has limited performance gain as the number of ports increases. Multiuser communications exploiting FAS has also been proposed recently in [10]- [12].…”

Section: Introductionmentioning

confidence: 99%

Copula-Based Analysis of Physical Layer Security Performances Over Correlated Rayleigh Fading Channels

Ghadi

Hodtani

2021

IEEE Trans.Inform.Forensic Secur.

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In this letter, we study the performance of a singleuser fluid antenna system (FAS) under arbitrary fading distributions, in which the fading channel coefficients over the ports are correlated. We adopt copula theory to model the structure of dependency between fading coefficients. Specifically, we first derive an exact closed-from expression for the outage probability in the most general case, i.e., for any arbitrary choice of fading distribution and copula. Afterwards, for an important specific case, we analyze the performance of the outage probability under correlated Nakagami-m fading channels by exploiting popular Archimedean copulas, namely, Frank, Clayton, and Gumbel. The results demonstrate that FAS outperforms the conventional single fixed-antenna system in terms of the outage probability. We also see that the spatial correlation dependency structure for the FAS is a key factor to determine its performance, which is natively captured through the choice of copula.

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Achievability of Fluid Antenna Multiple Access: A Han-Kobayashi's Comparison

New,

Wong,

et al. 2023

2023 IEEE Globecom Workshops (GC Wkshps)

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Recently, fluid antenna system (FAS) has emerged as a potential candidate to deliver extra diversity and multiplexing gains. This new technology can also be adopted to mitigate interference namely, fluid antenna multiple access (FAMA). Unlike existing schemes, the key concept of FAMA is to communicate at a spatial moment where the interference is in deep fade. However, FAMA treats interference as noise and it remains unclear whether such a strategy is capacity-efficient. To address this question, we leverage insights from information theory and introduce a new Han-Kobayashi (HK)-FAMA scheme that considers rate splitting, power splitting and joint decoding, to be a capacity benchmark. Using this capacity benchmark, we then illustrate that FAMA (alone without HK) can be near to being optimal despite its simplicity. Besides, we employ a new performance metric based on the generalized degree-of-freedom (gdof) to explain the principle of FAMA.

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A New Analytical Approximation of the Fluid Antenna System Channel

Cited by 41 publications

References 27 publications

Maximizing the network outage rate for fast fluid antenna multiple access systems

Maximizing the network outage rate for fast fluid antenna multiple access systems

Copula-Based Analysis of Physical Layer Security Performances Over Correlated Rayleigh Fading Channels

Achievability of Fluid Antenna Multiple Access: A Han-Kobayashi's Comparison

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