In this paper, the performance and system complexity of candidate multiple access (MA) techniques for next generation cellular systems, namely, power domain nonorthogonal (PD-NOMA) sparse code (SCMA), are investigated. To end, each MA technique, a resource allocation problem considering heterogeneous networks is formulated. We apply successive convex approximation method to obtain their solutions. Simulation results show that SCMA-based achieves better than PD-NOMA-based one at cost more complexity.

In this letter, we propose a cooperative relaying system (CRS) based on non-orthogonal multiple access (NOMA) which uses an amplify-and-forward relay. This letter proposes novel detection scheme in the received signals of two consecutive time slots at destination is applied. We calculate asymptotic outage probability and derive diversity order for each symbol. Simulations show that our has much better performance than NOMA-based CRS with decode-and-forward (DF) Also, ergodic sum rate...

In this paper, we develop and analyze three limited-feedback resource allocation algorithms suitable for uplink transmission in heterogeneous wireless networks (HetNets). setup, one macro-cell shares the spectrum with a set of underlay cognitive small-cells via orthogonal frequency-division multiple access (OFDMA), where interference from to should be kept below predefined threshold. The aim maximize weighted sum instantaneous rates all users over cells by jointly optimizing power subcarrier...

This paper proposes a novel approach to improve the performance of heterogeneous network (HetNet) supported by dual connectivity (DC) adopting multiple unmanned aerial vehicles (UAVs) as passive relays that carry reconfigurable intelligent surfaces (RISs). More specifically, RISs are deployed under UAVs termed UAVs-RISs operate over micro-wave (<inline-formula> <tex-math notation="LaTeX">$\mu \text{W}$ </tex-math></inline-formula>) channel in sky sustain strong line-of-sight (LoS) connection...

In this paper, the tradeoff among energy efficiency, fairness, harvested energy, and system sum rate is studied. regard, various fairness methods, namely, max-min proportional minimum delay potential in power-domain non-orthogonal multiple access-based heterogeneous cellular networks are investigated. order to perform successive interference cancellation (SIC), we use two ordering approaches compare their performance. To end, propose joint subcarrier power allocation algorithms achieve fair...

This paper investigates the problem of age information (AoI) aware radio resource management for a platooning system. Multiple autonomous platoons exploit cellular wireless vehicle-to-everything (C-V2X) communication technology to disseminate cooperative awareness messages (CAMs) their followers while ensuring timely delivery safety-critical Road-Side Unit (RSU). To lower computational load at RSU and cope with challenges dynamic channel conditions, we distributed allocation framework based...

As the services and requirements of next-generation wireless networks become increasingly diversified, it is estimated that current frequency bands mobile network operators (MNOs) will be unable to cope with immensity anticipated demands. Due spectrum scarcity, there has been a growing trend among stakeholders toward identifying practical solutions make most productive use exclusively allocated on shared basis through sharing mechanisms. However, due technical complexities these mechanisms,...

We propose a robust resource allocation framework to improve the physical layer security in presence of an active eavesdropper. In considered system, we assume that both legitimate receiver and eavesdropper are full-duplex (FD) while most works literature concentrate on passive eavesdroppers half-duplex (HD) receivers. this paper, adversary intends optimize its transmit jamming signal parameters so as minimize secrecy data rate transmission. literature, assuming operates HD mode,...

In this paper, we introduce a new cooperative paradigm for secure communication in cognitive radio networks (CRNs) where secondary users (SUs) are allowed to access the spectrum of primary (PUs) as long they preserve PUs presence malicious eavesdroppers. To do so, SU transmission is divided into two hops: at first hop, transmitter sends information relay set and receiver acts friendly jammer disturb overhearing eavesdroppers second one relays selected pass PU. setup, time duration each power...

In this paper, a new approach for multiple access in the fifth generation (5G) of cellular networks called power domain sparse code (PSMA) is proposed. PSMA, we adopt both and to transmit users' signals over subcarrier simultaneously. such model, same multiple-access (SCMA) codebook can be used by users, where, these non-orthogonal (PD-NOMA) technique send non-orthogonally. Although signal different SCMA codebooks detected orthogonally, users produces interference users. With reused coverage...

In this paper, we consider a decode-and-forward (DF) relay-assisted diffusion-based molecular communication system inside one of the blood vessels human body with positive drift from transmitter to receiver. We use normal approximation distribution number received molecules and derive closed-form expression for end-to-end bit error probability system. then propose an optimization problem that aims at minimizing solve it receiver nanomachine by algorithm based on bisection method determine...

In delay-sensitive industrial Internet of Things (IIoT) applications, the age information (AoI) is employed to characterize freshness information. Meanwhile, emerging network function virtualization provides flexibility and agility for service providers deliver a given using sequence virtual functions (VNFs). However, suitable VNF placement scheduling in these schemes NP-hard finding globally optimal solution by traditional approaches complex. Recently, deep reinforcement learning (DRL) has...

We investigate the ergodic uplink resource allocation problem for secure communication in relay-assisted orthogonal frequency-division multiple access (OFDMA)-based cognitive radio networks (CRNs) presence of a set passive eavesdroppers where relay nodes assist legitimate users to transmit their messages. Previous works have commonly assumed availability channel state information (CSI) this type problems. However, due decentralized nature CRNs and hidden activities eavesdroppers, assumption...

In this paper, fifth-generation (5G) cellular networks under three promising technologies, namely, dual connectivity, coordinated multi-point transmission (CoMP), and power domain non orthogonal multiple access (PD-NOMA) are investigated. The main aim is to maximize the downlink energy efficiency (EE) by using both millimeter wave (mmW) micro (μW) links in fronthaul, while employing CoMP PD-NOMA. regard, joint fronthaul radio resource allocation for a heterogeneous cloud network considered....

In this paper, we find trajectory planning and power allocation for a vehicular network in which an unmanned-aerial-vehicle (UAV) is considered as relay to extend coverage two disconnected far vehicles. We show that two-user with amplify-and-forward (AF) relay, non-orthogonal-multiple-access (NOMA) always has better or equal sum-rate comparison orthogonal-multiple-access (OMA) at high signal-to-noise-ratio (SNR) regime. However, the cases where i) base station (BS)-to-relay link weak, ii)...

Covert communication is often limited in rate because it difficult to hide the signal background noise. Recent work has shown that jamming can significantly improve at which covert be conducted, but this a devastating effect on receiver. To tackle issue, we equip jammer with multiple antennas so employ beamforming place intended receiver null space of jamming. Moreover, order increase network, transmitter an antenna array able perform 3-dimensional (3D) toward its recipient. evaluate design,...

Network slicing (NwS) is one of the main technologies in fifth-generation mobile communication and beyond (5G+). One important challenges NwS information uncertainty which mainly involves demand channel state (CSI). Demand divided into three types: number users requests, amount bandwidth, requested virtual network functions workloads. Moreover, CSI modeled by methods: worst-case, probabilistic, hybrid. In this paper, our goal to maximize utility infrastructure provider exploiting deep...

In this paper, we propose a cross-layer resource-allocation scheme for orthogonal frequency-division multiple-access (OFDMA) systems with imperfect channel-state information (CSI). our modeling, consider two traffic types: 1) streaming traffic, which requires maximum guaranteed average delay, and 2) elastic flexible rate requirements. We then queue-state (QSI) CSI in framework to maximize the total transmission of users while delay constraint power are satisfied. also impact CSI. An...

Here our focus is on the downlink radio resource allocation in underlay spectrum sharing based OFDMA technology. Both continuous and discrete rate strategies are investigated. We consider practical case which for wireless channel between secondary base station users only partial state information (CSI) available at station. formulate problem network as an optimization objective to maximize weighted sum rate. Two main constraints maximum total transmission power, primary service collision...

The ergodic resource allocation (ERA) problem for uplink transmission in underlay cognitive radio networks (CRNs) is investigated. objective to maximize the sum-rate of secondary users (SUs) considering unavailability perfect channel state information (CSI), and subject transmit power limitations SUs, interference threshold constraint guarantee quality service primary users. Since with average-based formulation ERA, SUs do not hold instantaneously, one can replace constraints ERA their...

In this paper, by considering multiple slices, a downlink transmission of sparse code access (SCMA) based cloud-radio network (C-RAN) is investigated. setup, assuming multiple-input and single-output (MISO) mode, novel robust radio resource allocation proposed where uncertain channel state information, the worst case approach applied. We consider problem with objective to maximize total sum rate users subject minimum required each slice practical limitations C-RAN SCMA. To solve optimization...

This paper studies a novel approach for successive interference cancellation (SIC) ordering and beamforming in multiple antennas non-orthogonal access (NOMA) network with multi-carrier multi-user setup. To this end, we formulate joint design, subcarrier allocation, user association, SIC algorithm to maximize the worst-case energy efficiency (EE). The formulated problem is non-convex mixed integer non-linear programming (MINLP) which generally difficult solve. handle it, first adopt...

In this paper, we consider unmanned aerial vehicles (UAVs) equipped with a visible light communication (VLC) access point and coordinated multipoint (CoMP) capability that allows users to connect more than one UAV. UAVs can move in 3-dimensional (3D) at constant acceleration, where central server is responsible for synchronization cooperation among UAVs. The effect of accelerated movement UAV necessary be considered. Unlike most existing works, examine the effects variable speed on kinetics...

In this paper, we study a Deep Reinforcement Learning (DRL) based framework for an online end-user service provisioning in Network Function Virtualization (NFV)-enabled network. We formulate optimization problem aiming to minimize the cost of network resource utilization. The main challenge is requests by fulfilling their Quality Service (QoS) under limited availability. Moreover, stochastic large another that evaluated paper. To solve formulated efficient and intelligent manner, propose...

In this paper, we develop a hierarchical aerial computing framework composed of high altitude platform (HAP) and unmanned vehicles (UAVs) to compute the fully offloaded tasks terrestrial mobile users which are connected through an uplink non-orthogonal multiple access (UL-NOMA). To better assess freshness information in computation-intensive applications criterion age (AoI) is considered. particular, problem formulated minimize average AoI with elastic tasks, by adjusting UAVs' trajectory...