Abstract Particle swarm optimization (PSO) is one of the most well-regard metaheuristics with remarkable performance when solving diverse problems. However, PSO faces two main problems that degrade its performance: slow convergence and local optima entrapment. In addition, this algorithm substantially degrades on high-dimensional classical PSO, particles can move in each iteration either slower or faster speed. This work proposes a novel idea called velocity pausing where proposed (VPPSO)...

In this article, we introduce a new multiple-access method, delta-orthogonal multiple access (D-OMA), for massive in future 6G cellular networks. D-OMA is based on the concept of distributed large coordinated multipoint (CoMP) transmission-enabled nonorthogonal (NOMA) using partially overlapping subbands NOMA clusters. We demonstrate performance scheme terms outage capacity different degrees subband overlapping. addition, propose novel D-OMA-based physical-layer security to enhance...

In future cell-free (or cell-less) wireless networks, a large number of devices in geographical area will be served simultaneously non-orthogonal multiple access scenarios by distributed points (APs), which coordinate with centralized processing pool. For such network static predefined beamforming design, we first derive closed-form expression uplink outage probability for user/device. To reduce the complexity joint received signals presence and APs, propose novel dynamic architecture. this...

In a cell-free network, large number of mobile devices are served simultaneously by several base stations (BSs)/access points(APs) using the same time/frequency resources. However, this creates high signal processing demands (e.g., for beamforming) at transmitters and receivers. work, we develop centralized distributed deep reinforcement learning (DRL)-based methods to optimize beamforming uplink network. First, propose fully method (i.e., learning) that uses Deep Deterministic Policy...

In this paper, the performance of two-way multiuser mixed radio frequency/free space optical (RF/FSO) relay networks with opportunistic user scheduling and asymmetric channel fading is studied. RF links are used to conduct data transmission between users node, while a FSO link on last-mile communication node base station. The assumed follow Rayleigh model, unified Gamma–Gamma atmospheric turbulence model pointing error. First, closed-form expressions for exact outage probability, asymptotic...

In a cell-free wireless network, distributed access points (APs) jointly serve all user equipments (UEs) within their coverage area by using the same time/frequency resources. this paper, we develop novel downlink multiple-input multiple-output (MIMO) millimeter wave (mmWave) network architecture that enables APs and UEs to dynamically self-partition into set of independent subnetworks in time-slot basis. For this, propose several partitioning algorithms based on deep reinforcement learning...

In this paper, a multiuser mixed radio frequency (RF) and hybrid free-space optical (FSO)/RF system is considered, where multiple mobile users transmit their data to an intermediate decode-and-forward relay node through RF links using virtual multiple-input multiple-output (MIMO) system, the forwards multiplexed of all FSO link that supported by MIMO backup destination. The equipped with buffer in physical layer for temporal storage users' until best channel conditions at relay-destination...

A novel generalized coordinated multi-point transmission (GCoMP)-enabled non-orthogonal multiple access (NOMA) scheme is proposed. In particular, distributed base stations (BSs) in a network coverage area cooperate on the downlink to serve set of user equipments (UEs) using same frequency band. Furthermore, all UEs associated BS and particular band forms single NOMA cluster. The number BSs serving UE referred as <italic xmlns:mml="http://www.w3.org/1998/Math/MathML"...

We propose a novel antenna clustering-based method for simultaneous wireless information and power transfer (SWIPT) in multiple-input multiple-output (MIMO) full-duplex (FD) system. For point-to-point communication set up, the proposed enables device with multiple antennas to simultaneously transmit harvest energy using same time-frequency resources. And transmitting receives from harvesting (EH) device. This is achieved by clustering into two MIMO subsystems: one transmission (IT) another...

A new multiple access method, namely, delta-orthogonal (D-OMA) is introduced for massive in future generation 6G cellular networks. D-OMA based on the concept of distributed large coordinated multipoint transmission-enabled non-orthogonal (NOMA) using partially overlapping sub-bands NOMA clusters. Performance this scheme demonstrated terms outage capacity different degrees sub-bands. can also be used enhanced security provisioning both uplink and downlink wireless Practical implementation...

Security and consistency of smart grids is one the main issues in design maintenance highly controlled monitored new power grids. Bad data injection attack could lead to disasters such as system outage, or huge economical losses. In many scenarios, attacker can come up with strategies that couldn't be detected by traditional bad detection methods. Adaptive Partitioning State Estimation (APSE) method [3] has been proposed recently combat attacks. this work, we evaluate compare a method. The...

This paper studies the performance of two-way multiuser mixed radio frequency/free space optical (RF/FSO) relay networks with opportunistic user scheduling <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> and asymmetric fading channels. The considered system consists multiple users communicating a destination node through decode-and forward (DF) in fashion. links between are assumed to be Rayleigh distributed RF channels, while link is...

We propose a multiple-input multiple-output (MIMO)-based full-duplex (FD) scheme that enables wireless devices to simultaneously transmit information and harvest energy using the same time-frequency resources. In this scheme, for MIMO point-to-point set up, transmitting device receives from harvesting device. Furthermore, self-interference (SI) at caused by FD mode of operation is utilized as desired power signal be harvested For implementation-friendly antenna selection precoding both...

The emergence of new wireless technologies together with the requirement massive connectivity results in several technical issues such as excessive interference, high computational demand for signal processing, and lengthy processing delays. In this work, we propose beamforming techniques an uplink cell-free network centralized, semi-distributed, fully distributed all based on deep reinforcement learning (DRL). First, a centralized method that uses deterministic policy gradient algorithm...

We investigate on large-scale deployment of non-orthogonal multiple access (NOMA) for improved spectral and power efficiency in cellular networks to provide massive wireless connectivity (e.g. machine-type communication [mMTC]). First, we describe the basics single-antenna NOMA technology its extension co-located multiple-antenna as well coordinated multipoint transmission (CoMP)-enabled technologies. Then discuss some practical challenges such inter-NOMA-interference (INI), inter-cell...

In this paper, the performance of two-way relaying (TWR) multiuser mixed radio frequency/free space optical (RF/FSO) relay networks with opportunistic user scheduling and asymmetric channel fading is studied. First, closed-form expressions for exact outage probability, asymptotic (high signal-to-noise ration (SNR)) average ergodic capacity are derived assuming heterodyne detection (HD) scheme. Additionally, impacts several system parameters including number users, pointing errors,...

In this paper, we consider decode-and-forward (DF) buffer-aided relay selection and transmission power allocation for underlay cognitive radio (CR) network that is equipped with multiple-input multiple-output (MIMO) antenna scheme. We propose a low complexity MIMO-based scheme maximizes the single-hop normalized rate of secondary (SN). Also, sub-optimal overall sum primary (PN) SN. first derive optimal expressions both PN The derived are then used in an iterative algorithm to produce...

In large scale dynamic wireless networks, the amount of overhead caused by channel estimation (CE) is becoming one main performance bottlenecks. This due to number users whose channels should be estimated and user mobility. work proposes a new hybrid estimation/prediction (CEP) scheme reduce in time-division duplex (TDD) cell-free massive multiple-input-multiple-output (mMIMO) systems. The sending pilot signal from each only once given (window) coherence intervals (CIs). Then minimum...