The fifth generation (5G) mobile networks are envisaged to enable a plethora of breakthrough advancements in wireless technologies, providing support diverse set services over single platform. While the deployment 5G systems is scaling up globally, it time look ahead for beyond systems. This mainly driven by emerging societal trends, calling fully automated and intelligent supported extended reality haptics communications. To accommodate stringent requirements their prospective applications,...

We consider the use of Fisher-Snedecor F distribution, which is defined as ratio two chi-squared variates, to model composite fading channels. In this context, root-mean-square power a Nakagami-m signal assumed be subject variations induced by an inverse Nakagamim random variable. Comparisons with physical channel data demonstrate that proposed provides good, and in most cases better, fit compared generalized-K model. Motivated result, simple novel expressions are derived for key statistical...

Visible light communication (VLC) has been proposed as a promising and efficient solution to indoor ubiquitous broadband connectivity. In this paper, non-orthogonal multiple access, which recently introduced an effective scheme for fifth generation (5G) wireless networks, is considered in the context of VLC systems under different channel uncertainty models. To end, we first derive novel closed-form expression bit-error-rate (BER) perfect state information (CSI). Capitalizing on this, then...

Energy detection (ED) is a simple and popular method of spectrum sensing in cognitive radio systems. It also widely known that the performance techniques largely affected when users experience fading effects. This paper investigates an energy detector over generalized <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\kappa{-}\mu$</tex></formula> Notation="TeX">$\kappa{-} \mu$</tex></formula> extreme...

The proliferation of mobile Internet and connected devices, offering a variety services at different levels performance, represents major challenge for the fifth generation wireless networks beyond. This requires paradigm shift toward development key enabling techniques next networks. In this respect, VLC has recently emerged as new communication to provide ubiquitous connectivity by complementing radio frequency communications. One main challenges systems, however, is low modulation...

The ever-increasing demand of mobile Internet and multimedia services poses unique significant challenges for current future generation wireless networks. These are mainly related to the support massive ubiquitous connectivity, low latency, highly efficient utilization spectrum resources. Therefore, it is a paramount importance address them in design deployment To this end, paper provides comprehensive overview multiple access schemes context visible light communications (VLC). Specifically,...

Recently, interest on the utilization of unmanned aerial vehicles (UAVs) has aroused. Specifically, UAVs can be used in cellular networks as users for delivery, surveillance, rescue search, or an base station (aBS) communication with ground remote uncovered areas dense environments requiring prompt high capacity. Aiming to satisfy requirements wireless networks, several multiple access techniques have been investigated. In particular, space-division (SDMA) and power-domain non-orthogonal...

Direct-conversion architectures can offer highly integrated low-cost hardware solutions to communication transceivers. However, it has been demonstrated that radio frequency (RF) impairments such as amplifier nonlinearities, phase noise, and in-phase/quadrature-phase imbalances (IQI) lead severe degradation of the performance systems. Motivated by this, present work is devoted quantification evaluation effects RF IQI on wireless communications in context cascaded fading channels for both...

In this letter, we investigate the sum of independent but not identically distributed (i.n.i.d.) Fisher-Snedecor F variates. First, a novel closed-form expression is derived for moment generating function instantaneous signal-to-noise ratio. Based on this, corresponding probability density and cumulative distribution i.n.i.d. variates are derived, which subsequently employed in analysis multiple branch maximal-ratio combining (MRC). Specifically, impact multipath shadowed fading outage...

The <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\kappa $ </tex-math></inline-formula> - notation="LaTeX">$\mu / inverse gamma and notation="LaTeX">$\eta composite fading models are presented extensively investigated in this paper. We derive closed-form expressions for the fundamental statistics of model, such as probability density function (PDF), cumulative distribution (CDF). Additionally, we solve...

In the present contribution, we propose a novel opportunistic ambient backscatter communication (ABC) framework for radio frequency (RF)-powered cognitive (CR) networks. This considers spectrum sensing (SS) integrated with ABC and harvest-then-transmit (HTT) operation strategies. Novel analytic expressions are derived average throughput, energy consumption efficiency (EE) in considered set up. These represented closed-form have tractable algebraic representation which renders them convenient...

This paper investigates the characteristics of shadowed fading observed in off-body communications channels at 5.8 GHz. is realized with aid κ-μ/gamma composite model, which assumes that transmitted signal undergoes κ-μ fading, subject to multiplicative shadowing. Based on this, total power multipath components, including both dominant and scattered non-negligible variations follow gamma distribution. For this we present an integral form probability density function (PDF) as well important...

The F composite fading model was recently proposed as an accurate and tractable statistical for the characterization of conditions encountered in realistic wireless communication scenarios. In present contribution, we capitalize on distinct properties this to derive analytical framework then evaluate achievable channel capacity over channels under different state information (CSI) assumptions. To end, first consider that CSI is known only at receiver, which novel analytic expressions optimum...

The synergy between visible light communication (VLC) and radio frequency (RF) networks has attracted a considerable amount of attention due to the envisioned improvements compared conventional systems, mainly in terms data rate coverage. In this paper, we investigate for first time coexistence VLC RF networks, assuming that both are served by common backhaul network, as well perfect imperfect channel state information (CSI). context, propose an optimal resource allocation scheme maximizes...

The use of unmanned aerial vehicles (UAVs) as base stations (BSs) is envisaged a key enabler for the fifth generation (5G) and beyond-5G networks. Specifically, (UAV-BS) are expected to provide ubiquitous connectivity high spectral efficiency. To this end, we present in correspondence an in-depth look into integration rate-splitting multiple access (RSMA) with UAV-BSs downlink transmissions. A non-convex problem joint UAV placement, RSMA precoding, rate splitting, aiming maximize weighted...

The increased proliferation of connected devices requires a development innovative technologies for the next generation wireless systems. One key challenges, however, is spectrum scarcity, owing to unprecedented broadband penetration rate in recent years. Based on this, visible light communication (VLC) has recently emerged as an effective potential solution enabling high-speed short-range communications. Yet, despite their undoubted advantageous features, VLC systems suffer from several...

Large intelligent surface (LIS) has recently emerged as a potential enabling technology for 6G networks, offering extended coverage and enhanced energy spectral efficiency. In this work, motivated by its promising potentials, we investigate the error rate performance of LIS-assisted nonorthogonal multiple access (NOMA) networks. Specifically, consider downlink NOMA system, in which data transmission between base station (BS) L users is assisted an LIS comprising M reflective elements (REs)....

This paper is devoted to the derivation of novel analytic expressions and bounds for a family special functions that are useful in wireless communication theory. These well-known Nuttall Q-function, incomplete Toronto function, Rice Ie-function, Lipschitz-Hankel integrals. Capitalizing on offered results, identities additionally derived between above Humbert, Φ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> , function as well specific...

Cognitive radio is an emerging wireless technology that capable of efficiently coordinating the use currently scarce spectrum resources, and sensing constitutes its most crucial operation. This paper proposes wideband multichannel methods utilizing fast Fourier transform or filter-bank-based for analysis. Fine-grained analysis facilitates optimal energy detection in practical scenarios where transmitted signal, channel frequency response, and/or receiver response do not follow commonly...

In this paper, we investigate the performance of energy detection-based spectrum sensing over F composite fading channels. To end, an analytical expression for average detection probability is first derived. This then extended to account collaborative sensing, square-law selection diversity reception, and noise power uncertainty. The corresponding receiver operating characteristics (ROC) are analyzed different conditions signal-to-noise ratio (SNR), uncertainty, time-bandwidth product,...

Visible light communication (VLC) technology was introduced as a key enabler for the next generation of wireless networks, mainly thanks to its simple and low-cost implementation. However, several challenges prohibit realization full potential VLC, namely, limited modulation bandwidth, ambient interference, optical diffuse reflection effects, devices' nonlinearity, random receiver orientation. On contrary, centralized machine learning (ML) techniques have demonstrated significant in handling...

The present contribution investigates Index Modulation Aided Non-Orthogonal Multiple Access (IM-NOMA) in simultaneously transmitting and reflecting reconfigurable intelligent surfaces (STAR-RIS)-assisted networks. In the proposed IM-NOMA scheme, information for a specific user (IM user) is spatially modulated across STAR-RIS subsurfaces according to predefined pattern. Then, IM detects its signal using an energy-based maximum likelihood (EML) detection method, which technically leverages...

The aim of this work is twofold. Firstly, we derive a novel closed-form representation for the Marcum Q-function, Q <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</sub> (a, b), which valid all values its order m. Secondly, propose tight approximation one dimensional Q(x). high accuracy derived expressions verified with aid computational algorithms as well through comparisons existing, yet limited, representations. Importantly, relationships...

This work investigates two important performance metrics of underlay cooperative cognitive radio (CR) networks: Interference cumulative distribution function licensed users and outage probability unlicensed users. These are thoroughly analyzed in realistic operating conditions such as imperfect fading channel information strict transmit power constraint, which satisfies interference constraint maximum over Nakagami-m channels. Novel closed-form expressions derived subsequently validated...