Analytical Characterization of Device-to-Device and Cellular Networks Coexistence

Al-Rimawi, Ashraf; Dardari, Davide

doi:10.1109/twc.2017.2712640

“…We consider the dynamic PPP downlink cellular-network shown in Fig.1 in which the locations of BSs are distributed as a homogeneous Poisson point process (HPPP) with density λ. A typical user is assumed to be randomly located, according to an independent stationary point process in a Voronoi cell, and has a connection with the closest BS [33]. In addition, we assume that all BSs transmit at constant power and each BS, serving one mobile station (MS), use the same radio resource.…”

Section: System Modelmentioning

confidence: 99%

Performance Analysis of Dynamic Downlink PPP Cellular Networks Over Generalized Fading Channels With MRC Diversity

Al-Rimawi

¹

,

Siam

²

,

Abdo

³

et al. 2021

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This paper proposes novel and generalized expressions to characterize the performance of modern cellular networks under realistic user mobility behavior. The η-µ distribution is employed to derive the received power probability density function, the average bit error rate for different modulation schemes, and the coverage probability assuming a Poisson point process spatial distribution of base stations in downlink. The user is assumed to experience fading with Maximum Ratio Combining (MRC) and move according to a random way-point mobility model. To get more insights on the achivable diversity order, accurate asymptotic expressions for the coverage probability and average bit error rate are derived. The derived expressions are applicable to different widely-used fading environments, such as Rayleigh and Nakagami-m as particular cases, by an appropriate selection of the η-µ parameters. Monte Carlo simulation was used to show the validity of the proposed expressions. In addition, the generalized expressions allow the system designer to quantify the effects of user mobility on the cellular network performance, in different propagation environments, and network topologies as a function of the number of base stations and MRC branches.

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“…To this end, κ-µ shadowed distribution is widely used in literature for modeling composite fading/shadowing. It has a clear physical interpretation, good analytical properties and unifies popular fading models such as One-Side Gaussian, Rayleigh, Nakagami-m, Rician, κ-µ, and η-μ fading channels as special cases as reported in [37] and [38,Table. I].…”

Section: B Motivation and Contributionmentioning

confidence: 86%

On the Performance of RIS-Assisted Communications with Direct Link over κ-µ Fading

Al-Dweik¹,

Al-Rimawi²

2022

Preprint

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0

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Reconfigurable intelligent surfaces (RISs) is a new technology that can be used to create a virtual line-of-sight (LOS) link when the direct link is blocked. The signal-to-noise ratio (SNR) can be significantly improved by optimizing the reflecting elements’ phases to make the reflected signals add coherently at the receiver. Nevertheless, the RIS cannot control the phase of the direct link if it exists. In such scenarios, the RIS phase can still be controlled such that the direct and reflected signals add coherently, however, the gain obtained by using the RIS might be hindered. Therefore, this paper considers the performance analysis of such scenarios where a novel analytical framework is developed to evaluate the SNR, outage probability and bit error rate (BER). To capture a broad range of fading conditions, the channels are modeled as independent but not identically distributed generalized κ-µ shadowed fading channels. The Laguerre expansion is used to derive the probability density function (PDF) and cumulative distribution function (CDF) of the instantaneous channel fading, which are used to derive the PDF and CDF of the instantaneous SNR. The paper also considers deriving the asymptotic PDF, CDF, moment generating function (MGF) of the SNR, as well as the outage probability and BER. The derived expressions are used to evaluate the system performance in various fading environments such as Rayleigh, One-Sided Gaussian, Nakagami-m , Rician, and Rician-shadowed distributions since they are special cases of the κ-µ shadowed distribution. The obtained analytical results corroborated by Monte Carlo simulation show that a strong direct link can generally eliminate the gain obtained using the RIS. Therefore, the overhead required for the RIS operation becomes a burden on the network and may cause severe throughput degradation. In such scenarios, the RIS involvement should dynamically controlled to avoid unnecessary complexity and throughput reduction.

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“…To this end, κ − µ shadowed distribution is widely used in literature for modeling composite fading/shadowing. It has a clear physical interpretation, good analytical properties and unifies popular fading models such as One-Side Gaussian, Rayleigh, Nakagami-m, Rician, κ-µ, and η-μ fading channels as special cases [28], and [29, Table . I]. To the best of our knowledge, no prior work in literature has derived an analytical framework for studying RIS-assisted wireless communication systems in the more generalized κ-µ shadowed fading channel.…”

Section: B Motivation and Contributionmentioning

confidence: 99%

“…The κ-µ shadowed model has an additional parameter ω, as compared to κ-µ model, which is related to shadowing. Consequently, it has a clear physical interpretation, flexible analytical properties and can represent common fading models such as One-Side Gaussian, Rayleigh, Nakagami-m, Rician, κ-µ, and η-μ fading channels as special cases [28], [29,Table. I].…”

Section: B Channel Modelmentioning

confidence: 99%

On the Performance of RIS-Assisted Communications with Direct Link in κ-µ Shadowed Fading Channels

Al-Dweik¹,

Al-Rimawi²

2022

Preprint

Self Cite

0

View full text Add to dashboard Cite

Reconfigurable intelligent surfaces (RISs) is a new technology that can be used to create a virtual line-of-sight (LOS) link when the direct link is blocked. The signal-to-noise ratio (SNR) can be significantly improved by optimizing the reflecting elements’ phases to make the reflected signals add coherently at the receiver. Nevertheless, the RIS cannot control the phase of the direct link if it exists. In such scenarios, the RIS phase can still be controlled such that the direct and reflected signals add coherently, however, the gain obtained by using the RIS might be hindered. Therefore, this paper considers the performance analysis of such scenarios where a novel analytical framework is developed to evaluate the SNR, outage probability and bit error rate (BER). To capture a broad range of fading conditions, the channels are modeled as independent but not identically distributed generalized κ-µ shadowed fading channels. The Laguerre expansion is used to derive the probability density function (PDF) and cumulative distribution function (CDF) of the instantaneous channel fading, which are used to derive the PDF and CDF of the instantaneous SNR. The paper also considers deriving the asymptotic PDF, CDF, moment generating function (MGF) of the SNR, as well as the outage probability and BER. The derived expressions are used to evaluate the system performance in various fading environments such as Rayleigh, One-Sided Gaussian, Nakagami-m , Rician, and Rician-shadowed distributions since they are special cases of the κ-µ shadowed distribution. The obtained analytical results corroborated by Monte Carlo simulation show that a strong direct link can generally eliminate the gain obtained using the RIS. Therefore, the overhead required for the RIS operation becomes a burden on the network and may cause severe throughput degradation. In such scenarios, the RIS involvement should dynamically controlled to avoid unnecessary complexity and throughput reduction.

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Analytical Characterization of Device-to-Device and Cellular Networks Coexistence

Cited by 15 publications

References 39 publications

Performance Analysis of Dynamic Downlink PPP Cellular Networks Over Generalized Fading Channels With MRC Diversity

Performance Analysis of Dynamic Downlink PPP Cellular Networks Over Generalized Fading Channels With MRC Diversity

On the Performance of RIS-Assisted Communications with Direct Link over κ-µ Fading

On the Performance of RIS-Assisted Communications with Direct Link in κ-µ Shadowed Fading Channels

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