We study a self-organizing wireless network in which the number of active connections to the typical user equipment (UE) is dynamic, in order to sustain temporally varying network traffic. Using tools of stochastic geometry, we show that even though the signal coverage improves with a higher degree of connectivity, the per-user throughput may degrade. Consequently, the operator needs to reconfigure

The next-generation wireless communication systems must address the compensation of in-phase and quadrature phase imbalance (IQI), carrier frequency offset (CFO), and doubly selective channel (DSC) to provide a high quality of service for high mobility users with low-cost radio . None of the existing works consider all these RF impairments under DSC for multi-user scenario. To address this gap, in

The RTCA (Radio Technical Commission for Aeronautics) DO-260B document has stimulated in latest years the adoption of novel algorithms to improve the ability of receivers to detect and decode ADS-B (Automatic Dependent Surveillance-Broadcast) signals, with particular emphasis on preamble detection, declaration of bit state and confidence level, detection and correction of errors. Motivated by an industry-driven

In this paper, the physical layer security is investigated in a dual-hop wireless communication scenario, where an energy-constrained relay not only assists the source-to-destination information transmission, but also acts as a potential eavesdropper wiretapping the source information. We take into account both antenna mode switching and destination selection for the amplify and forward relaying network

Non-orthogonal multiple access (NOMA) combined with multiple-input multiple-output (MIMO) can greatly increase the system throughput, but it will cause additional interference. Generally, the interference can be eliminated by utilizing the precoding technology. The previous studies preferentially focused on the channel difference between users, and neglected the lowly correlated scenarios, leading

In this paper, we investigate the interference suppression by exploiting wireless cache in relaying networks for beyond fifth-generation (B5G) communications, where multiple decode-and-forward (DF) relays equipped with wireless cache assist the data transmission from the source to the destination over cochannel interference environments. To alleviate the severe effect of interference, wireless cache

Based on the inverted pendulum model, gait planning of biped robot is carried out, which makes it walk steadily and realizes steering in one step. Aiming at the stability of the turning poses of the humanoid robot, this paper studies the landing stability analysis of the robot, the planning and control of landing after turning, improves the inverted pendulum model, and introduces the turning angle

Mobile edge computing (MEC) is an attractive solution for the contradiction between huge computation resources and limited processing capacity of vehicular terminals, especially for the emerging 5G and beyond 5G (B5G) vehicular networks. However, most of the existing studies focus either on data interactions among moving vehicles or communications between vehicles and road side units (RSUs), ignoring

Radio frequency fingerprint identification (RFID) provokes many promising applications of internet of things. Deep learning is considered as one of powerful tools to empower RFID techniques. Recently, several deep learning based RFID methods have been proposed. However, their deep neural networks were trained from the limited length of RF fingerprint samples due to the very high training cost. Hence

Caching has emerged as an efficient technique to reduce delivery latency and network congestion. The focus of this paper is on content delivery in the caching-based wireless systems. In view of the fact that in such systems, users store fractional of popular contents during off-peak hours, we propose a modified version of the Luby Transform (MLT) encoding for the delivery phase to take the advantage

Recently, the orthogonal frequency-division multiplexing (OFDM) system has become an appropriate technique to be applied on the physical layer in various requests, mainly in wireless communication standards, which is the reason to use OFDM within mobile wireless medical applications. The OFDM with cyclic prefix (CP) can compensate lacks for the time-invariant multi-path channel effects using a single

Constitutional design is a new grammatical relationship and thinking mode of modern morphological design. It reflects the basic characteristics of modern design that engages in the essence of things and uses analysis and comprehensive scientific methods to create shapes. Genetic algorithms are bionic algorithms in a macro sense and a branch of evolutionary algorithms. The structure of neural networks

In this paper, we introduce a method to estimate the drone location in a wireless sensor field (SF). The sensors are assumed to be installed in a field in a doublets form (i.e., each two sensors are combined to form a doublet). Each doublet in the near drone location can be used to estimate the angle between the doublet axis and the line connecting the drone to doublet’s vertex. The locus of this angle

Indoor intrusion detection based on Wireless Local Area Network (WLAN) has been widely used for security monitoring, smart homes, entertainment games, and many other fields in the Beyond 5G (B5G) wireless communication network environment. Most existing indoor intrusion detection methods directly exploit the Received Signal Strength (RSS) data collected by Monitor Points (MPs) and pay little attention

This paper studies the problem of joint relay selection and power allocation (J-RS-PA) for non-orthogonal multiple-access (NOMA)-based multicast cognitive radio networks with energy-harvesting (EH) relays. Particularly, the primary and secondary transmitters communicate with their receivers over EH amplify-and-forward relays, with the aim of simultaneously maximizing the network sum-rate, minimizing

Filter Bank Multicarrier (FBMC) is a multicarrier scheme that employs shaping filter for improved spectral properties. In this paper, a low complexity data-aided symbol timing and carrier frequency offset synchronization technique for FBMC is presented for continuous mode transmission. Two training sequences based on Zadoff–Chu sequence are proposed. The first sequence is called the Long Sequence that

With the rapid development of electronic technology and its widespread application in modern warfare, the modulation methods of individual radar signal sources are more flexible, the parameters are diverse, and the modern battlefield electromagnetic signal environment is complex, so that radar signal recognition based on traditional conventional parameters Technology cannot meet real needs. Among the

Frequency allocation in small cell-based green heterogeneous mobile networks is a demanding research domain nowadays. Femtocells are the essential components of small cell networks. In this paper, we propose a low power micro-femtocell network using the master–slave algorithm. In the master–slave algorithm, the master node allocates work to the slave nodes. When a slave ends its task given by a master

Deep learning based intelligent intrusion detection (IID) methods have been received strongly attention for computer security protection in cybersecurity. All these learning models are trained at either a single user server or centralized server. For one thing, it is almost impossible to train a powerful deep learning model at a single user. For other, it will encounter intrusion risks at centre server

This paper exploits the parallelism between Discrete Gabor Transform (DGT) and Generalized Frequency-Division Multiplexing (GFDM) that exists when the synthesis function, i.e. the pulse shaping filter, and the analysis function, i.e. the receiving filter, satisfy the Wexler–Raz identity. Choosing functions that satisfy the Wexler–Raz condition allows optimal symbol-by-symbol detection for a DGT-based

Utilization of flying platforms like Unmanned Aerial Vehicles (UAVs) is progressively increasing in our daily lives. Key characteristics such as flexibility, mobility and adaptive altitude, make UAVs particularly suitable for application in areas such as crop management, goods delivery, public safety and real-time video surveillance of public places to assist in terrestrial networks. IEEE 802.11ah

Spectrum sensing is an essential aspect of cognitive radios that allows secondary users (SUs) to opportunistically use licensed frequency bands while the primary user is idle. In this paper, we assume the available spectrum is divided into multiple bands, and SUs search over these bands to detect the empty bands, which is known as multi-band spectrum sensing. Most of the recent work focus on spectrum

In order to find a solution for the target coverage problem in directional sensor networks (DSNs), some researchers have recently introduced several efficient algorithms. These sensors are conventionally supposed to have a single power level and a single coverage is just needed for targets. In other words, there are various sensing ranges and power consumptions for these sensors under real conditions

Nowadays, the demand for mobile wireless communication systems has increased drastically due to its significant use for various real-time applications. This increased demand for communication causes heavy utilization of the radio spectrum to improve ubiquitous computing services. However, systems providing high-speed communication fail to achieve the desired performance due to unsystematic spectrum

This paper studies multi-antenna processing based cache-aided relaying networks for B5G communications, where the techniques of multi-antenna processing and wireless caching are investigated by studying the impact on the network performance. As to the multi-antenna processing scheme, both the selection combining (SC) and the maximal-ratio transmission/maximal-ratio combining (MRT/MRC) technique are

This paper investigates the opportunistic sharing of relay for the proposed Non-Orthogonal Multiple Access (NOMA) assisted Cognitive Radio Networks (CRNs). The proposed scheme consists of a base station that communicates the superimposed composite signal to Primary Equipment (PEs) as well as Secondary Equipment (SEs) with/without a relay. This scheme is opportunistically investigated with both Decode-and-Forward

This paper investigates the legitimate eavesdropping of a wireless powered suspicious communication network. The considered network consists of a wireless powered suspicious transmitter, a suspicious receiver, and a power station. The power station is assumed to be also a monitor to legitimately eavesdrop the suspicious communication with the help from a wireless powered jammer. The problem for maximizing

Downlink channel estimation in FDD massive MIMO systems is a challenge in 5G wireless communication systems. Using orthogonal pilots for downlink channel estimation leads to the pilot overhead problem. To cope with this problem, spatio-temporal common sparsity feature of delay domain beside the compressive sensing algorithm has used for channel estimation. In a practical affair, the spatial common

Millimeter wave (mmW) communication coupled with massive MIMO architecture is attaining considerable attention to overcome the huge data rate requirements. Increasing the dimensions of a massive MIMO architecture provides spatial multiplexing gains, but at the cost of decrease in hardware efficiency. To optimize the energy efficiency of massive MIMO systems, in this paper, focusing on a sub-connected

Quadratic residue (QR) codes have a high prospect on error correction for reliable data conveyance over channel with noise. This paper presents a fast algebraic scheme for decoding the binary (41, 21, 9) QR code for correcting up to 4 errors on an one-case-by-one-case basis, in which the calculation of unknown syndromes is eliminated and the conditions for checking for the various numbers of errors

Vehicle-to-Infrastructure (V2I) networks have a wide application prospect for providing vehicles with reliable road safety and infotainment services. This paper studies an Unmanned Aerial Vehicle (UAV)-assisted vehicular network, in which a UAV with cache is dispatched to communicate with moving vehicles and base stations. We study the throughput maximization problem by optimizing the power distribution

In this paper, the physical layer (PHY) security performance for a coordinate interleaved orthogonal design (CIOD) for space–time coding system with transmit antenna selection scheme (TAS) is analyzed and evaluated. As an important performance measure for the PHY security in the wireless systems, closed-form expression is derived for the secrecy outage probability (SOP) of a CIOD space–time coding

Energy-based localization has received great interest due to its low cost and simple implementation. It is well-known that sensor placement around the source plays a significant role in localization performance. This paper considers source localization based on the received signal strength difference (RSSD). Then, we propose two methods for sensor placement using maximization of the determinant of

Handovers (HOs) have been envisioned to be more challenging in 5G networks due to the inclusion of millimetre wave (mm-wave) frequencies, resulting in more intense base station (BS) deployments. This, by its turn, increases the number of HOs taken due to smaller footprints of mm-wave BSs thereby making HO management a more crucial task as reduced quality of service (QoS) and quality of experience (QoE)

In this paper, we investigate the detection performance for MIMO signals in a wireless full-duplex (FD) relaying network, in which the diversity techniques, including maximal ratio transmission (MRT) at source and maximal ratio combining (MRC) at destination, are applied. Especially, we rigorously study the impact of hardware impairment (HI) at all nodes and the residual self-interference (RSI) at

Mobile edge computing (MEC) is a prospective technology to enhance the computing power of mobile devices by offloading the tasks to MEC server. Due to the limited size of mobile devices, the insufficient of battery becomes a serious problem. Wireless power transfer (WPT) and mobile devices cooperation can extend the endurance of mobile devices. Integrating unmanned aerial vehicle (UAV) into wireless

Generally, Big Data denotes that datasets may not be apparent, accomplished, deal with or even acquired by the traditional tools in IT and the software or hardware tools in an acceptable period. This paper presents a new method for the minimization of the For the purpose of feature extraction, the Term Frequency–Inverse Document Frequency (TF–IDF) has been employed. A Feature Selection process takes

Due to the recent advances in intelligent transportation systems (ITS), Automatic Train System (ATS) gained significant attention among the research community. An effective ATS offers the whole railway network to operate in a safe, cost-effective and proficient manner against sudden disturbances like temporary platform blockages. Numerous Train Timetable Rescheduling (TTR) models have been presented

In this paper, we investigate the secrecy performance of simultaneous wireless information and power transfer (SWIPT) systems in terms of the secrecy outage probability (SOP), where multi-antenna diversity is employed to combat deep fading. In this investigated system, there are three nodes, namely, a source, a destination and an eavesdropper, and the destination and the eavesdropper are equipped with

Spatial Modulation (SM) is a Multi-Input Multi-Output (MIMO) transmission technique where only one antenna transmits data in each transmission interval, leading to a reduction in the number of RF chains and transmission power. The application of SM in Massive MIMO systems relies on perfect channel estimation, which is a fundamental challenge in these systems. Differential Spatial Modulation (DSM) is

Millimeter wave (mm-wave) at 60 GHz is a revolutionary technology for ultra-high data rate indoor communications. Unfortunately, due to unfavorable channel characteristics, communication at 60 GHz suffers from poor link budget, high penetration loss and severe signal attenuation. To improve the link budget and the quality of the received signal, the beamforming techniques must be incorporated. In this

In recent years, non-orthogonal multiple access (NOMA) has attracted considerable attention as a promising multi-access technique for next generation wireless communication systems. Media-based modulation (MBM), which is an emerging index modulation concept, is another technique that can be considered for next generation wireless communication systems due to its high spectral and energy efficiency

In this paper, the problem of pilot contamination in a multi-cell massive multiple input multiple output (MIMO) system is addressed. We propose a pilot assignment scheme, in which compared to the conventional methods, the corresponding optimization problem is solved in a low-complexity manner. To this end, by utilization of multi-path model comprising angle of arrival (AoA) distributions of users for

Medical image fusion and classification has been utilized to get valuable significant data multimodality medical image data. The fundamental commitment of this paper is to extricate the compelling features from the fused medical image that is Multimodality Medical images (MMI) for the classification model. At first, MMI are considered for the fusion procedure by shearlet Transform and optimization

A secondary fading multiple access channel (S-FMAC) with two transmitters, having random available bandwidth taking values 0 or 1 and one coherent receiver knowing random and independent channel coefficients, has been studied before. In this paper, we investigate the wiretap version of S-FMAC as a secondary multiple access wiretap channel (S-MAC-WT) over similar Rayleigh/ Rayleigh and dissimilar Rayleigh/Nakagami

Terahertz communications offers a massive potential for the prospective beyond 5G wireless systems, as the band offers huge bandwidth and data rates as compared to the existing sub 6 GHz bands, which are almost saturated. In this paper, we investigate the feasibility of wireless communications over the Terahertz-band (0.75–10 THz) at various atmospheric altitudes, considering different transmission

Autism Spectrum Disorder (ASD) is a disorder of neurodevelopment whose delayed diagnosis has been posing a barrier in alleviating the severity of the conditions of the sufferers. ASD patients experience difficulties with social communication and interaction. They also show restricted and repetitive patterns of behavior. Approximately 62 million people are diagnosed with ASD globally. Males are about

This study develops a new class of super-orthogonal trellis codes for four transmit antennas based on double space–time codes. The transmit antennas are divided into two groups, each having two transmit antennas. The information bits are demultiplexed into two streams; each is encoded independently using a super-orthogonal trellis code and then is transmitted from the corresponding antenna group. The

Fifth Generation (5G) communication systems will accommodate various kinds of data. There are two important problems in the 5G protocol, which have not been studied in depth. The first problem is the co-existence of heterogeneous communication standards; the second issue is to fuse information from different sources, for example, in cognitive communications. A new coding scheme, namely pattern exclusive

Pressure control drilling technology (MPD) an effective solution to the problems of low efficiency and high drilling risk of conventional drilling technology. Based on the current working environment of the oil well site, this paper introduces a data acquisition system based on the well field wireless transmission network, studies and analyzes the factors affecting the bottom hole pressure and the

Existing public safety networks (PSNs) are not designed to cope with disasters such as terrorist attacks, consequently leading to long delays and intolerable response times. First responders’ life threats when accessing the attacked zone are more severe in comparison to other disasters and the accuracy of basic information such as the number of terrorists, the number of trapped people, their locations

Grid search is the most effective method for tuning hyperparameters in machine learning (ML). However, it has high computational complexity, and is not appropriate when here are many hyperparameters to be tuned. In this paper, two novel suboptimal grid search methods are presented, which search the grid marginally and alternatively. In order to show the efficiency of hyperparameter tuning by the proposed

Millimeter-wave (mmWave) communication systems are realized to play a key role in next-generation communication systems to achieve high data rate requirements, allowing manifold connected devices and efficient bandwidth utilization. Although mmWave communication has severe degradation problems, security is considered as one of the most important issues. The objective of this study is to analyze and

Millimeter wave (mmWave) communications based on unmanned aerial vehicles (UAVs) are very promising in the fifth generation (5G) and future communication networks due to its ultra-high capacity. Considering the navigation of UAVs and narrow beam of mmWave, unstable beam pointing in the three-dimensional (3D) space becomes a key challenge for the mmWave UAV communications. In this paper, a novel spatial

In this paper, a strategy is designed to address the problem of closed trajectory cooperative target search for multiple UAVs, with the flight range and the initial and terminal heading constrains. The strategy is composed of two related phases, cooperative target searching phase and flight path planning phase for UAV returning to the nearest base. In the first phase, an Immune Genetic Algorithm (IGA)

As a generalized framework unifying the traditional orthogonal frequency-division multiplexing (OFDM) and single-carrier frequency-domain equalization (SC-FDE), orthogonal signal-division multiplexing (OSDM) has emerged as a promising modulation scheme for building reliable underwater acoustic communication (UAC) systems. However, given the temporal and spatial variability of acoustic links, the received

In emergency situations, existing Internet of Things (IoT) infrastructure is vulnerable to natural disasters and unable to provide reliable services to users in disaster areas. Due to flexible maneuverability and fast deployment, unmanned aerial vehicle (UAV) plays an important role in the IoT deployment in emergency since it can be fast deployed as aerial relay to significantly enhance the communication

This paper investigates the cell-edge user’s performance in a two-user multiple-input single-output non-orthogonal multiple access (MISO-NOMA) systems using downlink beamformers for optimal power allocation. In particular, power allocation coefficients (PACs) are adjusted through beamformers so that the cell-edge user’s performance is improved in a two-user network scenario. In the proposed model,

In wireless cellular networks a user equipment can be scheduled for uplink transmission only if the timing is correctly synchronized. Hence, a dedicated channel must be established, i.e. the Physical Random-Access Channel (PRACH), which has a key role as interface between the non-synchronized users’ equipment and the uplink orthogonal transmission scheme. Due to the stringent requirements in terms