Enhancing QoS Through Fluid Antenna Systems over Correlated Nakagami-m Fading Channels

Tlebaldiyeva, Leila; Nauryzbayev, Galymzhan; Arzykulov, Sultangali; Eltawil, Ahmed M.; Tsiftsis, Theodoros A.

doi:10.1109/wcnc51071.2022.9771633

Cited by 33 publications

(27 citation statements)

References 18 publications

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“…Besides, the diversity gain can be translated into a significant capacity gain [29]. 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: Contextmentioning

confidence: 99%

“…While most efforts in fluid antenna communication systems are limited to single-user scenarios, for example, [27][28][29][30][31][32][33][34][35][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: Contextmentioning

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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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: Contextmentioning

confidence: 99%

Section: Contextmentioning

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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“…Early studies on considering such positionadaptable antenna for single-user channels were given in [8], [9], demonstrating great diversity and capacity benefits. Since then, researchers have stepped up in studying the performance of fluid antenna systems in more general fading channels [10]- [12] and designing new coded modulation schemes [13].…”

Section: Introductionmentioning

confidence: 99%

Deep Learning Enabled Slow Fluid Antenna Multiple Access

et al. 2023

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The increasing interest of fluid antenna systems is reinforced by an unprecedented way of achieving multiple access, by exploiting moments of deep fades in space. This phenomenon, referred to as fluid antenna multiple access (FAMA), allows the fluid antenna at each user to be switched to a location in space (i.e., port) where the sum-interference power collectively suffers from a deep fade, resulting in a decent signal reception without the need of complex signal processing. Nevertheless, selecting the best port is an arduous task, which requires a large number of channel observations to obtain the high performance gain. This letter aims to devise a low-complexity port selection scheme for FAMA where each user has a small number of port observations only. We assume slow FAMA (s-FAMA) so that the selected port remains unchanged until the channel conditions change. A deep learning approach is proposed to infer the signal-to-interference plus noise ratios (SINR) at all the available ports given only a small number of observations. The simulation results exhibit that the proposed scheme is able to attain significant reductions in outage probability, and improvements in multiplexing gain, from a relatively small number of available port observations, showing great potential for future multiple access technologies.

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“…The FAS-enabled receivers were studied in [6], [7] for a point-to-point network over correlated Rayleigh fading channels; the outage probability (OP) formulas for FAS-Rx was presented and the FAS performance was compared to the traditional maximum-ratio-combining diversity. The authors in [8] applied a similar system model for an analog beamformed mmWave network and derived the OP formula in a single integral form. The authors in [6]- [9] reported a high performance of the FAS receivers even at a half wavelength size of an antenna length.…”

Section: Introductionmentioning

confidence: 99%

Outage Performance of Fluid Antenna System (FAS)-aided Terahertz Communication Networks

Tlebaldiyeva¹,

Arzykulov²,

Rabie³

et al. 2023

Preprint

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Millimeter-wave networks have already been successfully rolled out in many countries and now the research direction heads toward new technologies and standards to enable Tbps rates for future sixth-generation (6G) wireless communication systems. This work studies a point-to-point terahertz (THz) communication network exploiting the concept of a fluid antenna system (FAS) over correlated alpha-mu fading channels, nicely fitting the THz communication. Furthermore, the considered system is expanded to the selection-combining-FAS (SC-FAS) and maximum-gaincombining-FAS (MGC-FAS) diversity variates at the receiver side. The proposed FAS and its diversity configuration techniques are aimed to combat the high path loss, blockages, and molecular absorption effect related to the THz band. Our contribution includes comprehensive outage probability (OP) performance analysis for the THz band given the non-diversity and diversity FAS receivers. Moreover, the derived outage probability formulas are verified via Monte Carlo simulations. Numerical results have confirmed the superior performance of the MGC-FAS scheme in terms of OP. Finally, this work justifies that a higher number of antenna ports dramatically improves the system performance, even in the presence of correlation.

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Enhancing QoS Through Fluid Antenna Systems over Correlated Nakagami-m Fading Channels

Cited by 33 publications

References 18 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

Deep Learning Enabled Slow Fluid Antenna Multiple Access

Outage Performance of Fluid Antenna System (FAS)-aided Terahertz Communication Networks

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