The Role of Correlation in the Doubly Dirty Fading MAC With Side Information at the Transmitters

Ghadi, Farshad Rostami; Hodtani, Ghosheh Abed; López‐Martínez, F. Javier

doi:10.1109/lwc.2021.3092165

Cited by 12 publications

(9 citation statements)

References 16 publications

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“…Here, we provide numerical results to evaluate the proposed analytical expressions, in a number of multiuser FA set-ups. Parameter values are designed using [5], [16] as a reference. We consider a number of users K = 4, 16, 32, and the rest of simulation parameters as P = 30dBm, σ 2 = −80dBm, R th = 1bps/Hz, δ 2 = 1, and (m 1 , m 2 ) = (2,4).…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Specifically, we consider a K-user dirty multiple access channel (DMAC) in which each user takes advantage of non-causally available side information (SI) and sends an independent message to a common BS receiver equipped with an FA system through correlated Fisher-Snedecor F fading channels. In this model, SI is an information-theoretic concept that mainly refers to either CSI or interference awareness, and has the ability to meet the reliability constraint in future wireless networks by reducing the destructive effects of the interference and providing reliable communication at higher rates [14], [15], [16]. In particular, by connecting Jakes' model to copula theory with the help of rank correlation coefficients such as Spearman's ρ, we first provide an analytical expression for the joint cumulative distribution function (CDF) in the considered multiuser FA system under correlated Fisher-Snedecor F fading channels, and then derive the OP in a closed-form expression.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fluid Antenna-Assisted Dirty Multiple Access Channels Over Composite Fading

Rostami Ghadi,

Wong,

López-Martínez

et al. 2024

IEEE Commun. Lett.

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This letter investigates the application of the emerging fluid antenna (FA) technology in multiuser communication systems when side information (SI) is known at the transmitters. We consider a K-user dirty multiple access channel (DMAC) with non-causally known SI at the transmitters, where K users send independent messages to a common receiver with a FA capable of changing its location depending on the channel condition. By connecting Jakes' model to copula theory through Spearman's ρ rank correlation coefficient, we accurately describe the spatial correlation between the FA channels, and derive a closed-form expression for the outage probability (OP) under Fisher-Snedecor F fading. Results confirm that a FA-aided receiver can achieve better performance in multiuser communication: (i) increasing the number of FA ports as well as FA size can significantly lower the OP; (ii) FA can support a large number of users using only one FA at the common receiver in a few wavelengths of space.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluid Antenna-Assisted Dirty Multiple Access Channels Over Composite Fading

Rostami Ghadi,

Wong,

López-Martínez

et al. 2024

IEEE Commun. Lett.

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“…If K → ∞, it goes to 0. In (19), it is straightforward as K → ∞, the outage probability reaches 0 due to the term −1 β . Finally, in (20), the logarithm value is always negative, thereby when K → ∞, the outage probability achieves 0.…”

Section: Special Case: Correlated Nakagami-m Fadingmentioning

confidence: 99%

“…Specifically, generating the true multivariate distributions of correlated channels in FAS is hard due to mathematical and statistical limitations. To overcome this, one flexible approach to describe the structure of dependency between two or more random variables (RVs) is copula theory which has recently received significant attention in the performance analysis of wireless communication systems [13]- [19]. Generally speaking, copulas are mainly described with a dependence parameter which can measure the degree of dependence between RVs beyond linear correlation.…”

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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“…In their work [21], the authors delve into examining the influence of fading correlation on the performance of the doubly dirty fading MAC when non-causally known side information is available at transmitters.…”

Section: Related Workmentioning

confidence: 99%

Communication Performance Analysis of Wireless Multiple Access Channel with Specially Correlated Sources

Entezami,

Hodtani

2023

Preprint

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From practical and theoretical viewpoints, performance analysis of the communication systems by using information-theoretic results is very important. In this study, first, we obtain a general achievable rate for tow-user wireless multiple access channel (MAC) with specially correlated sources as a more general version for continuous alphabet MACs, by extending the known discrete alphabet results to the wireless continuous alphabet version. Next, the impact of wireless channel coefficients correlation on the performance metrics by using Copula theory, as the most convenient way for describing the dependence between several variables, is investigated and by applying the Farlie-Gumbel-Morgenstern (FGM) Copula function, we obtain a closed-form expressions for the outage probability (OP) under positive / negative dependence conditions. It is shown that the fading correlation improves the OP for negative dependence structure. Specifically, whenever the dependence structure tends to negative values, the OP decreases and the efficiency of the channel increases. Finally, the efficiency of the analytical results is illustrated numerically.

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The Role of Correlation in the Doubly Dirty Fading MAC With Side Information at the Transmitters

Cited by 12 publications

References 16 publications

Fluid Antenna-Assisted Dirty Multiple Access Channels Over Composite Fading

Fluid Antenna-Assisted Dirty Multiple Access Channels Over Composite Fading

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

Communication Performance Analysis of Wireless Multiple Access Channel with Specially Correlated Sources

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