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

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

Frequency synchronization and channel equalization are of a great importance in any multicarrier communication system. Hence, in this paper, a joint carrier frequency offset (CFO) and channel estimation approach is proposed for multiuser filter bank multicarrier (FBMC) in the uplink of massive multiple input multiple output (MIMO) systems. Our proposed solution jointly estimates the CFO and channel

Non-orthogonal multiple access (NOMA) along with wireless power transfer have recently been adapted to cooperative communications for 5G and beyond wireless networks. This paper investigates NOMA based cooperative relaying wireless-powered networks (CRWPNs) where, decode-and-forward (DF) relaying and successive interference cancellation are both employed at a wireless-powered intermediate node. For

Unpredictable nature of fading channels and difficulty in tracking channel state information pose major challenge in wireless energy harvesting communication system design. In this work, we address relay selection problem for wireless powered communication networks, where the relays harvest energy from the source radio frequency signals. A single source–destination pair is considered without a direct

The technological demand drastically requires Internet of Things (IoT) execution. Certainly, it will bring a paradigm transformation from a local city to a smart city. Besides several other applications, Intelligent transportation system (ITS) will bring a dominant smart society shift. ITS will benefit growing traffic system safety, reliability, demand and security. 5G Ultra-Reliable and Low Latency

To compensate the severe path loss of millimeter-wave channel, large-scale antenna arrays are required to provide beamforming gains for millimeter wave communication systems. Since the millimeter wave (mmWave) MIMO channel has strong directional selectivity, it is necessary for transmitter and receiver to perform beam alignment for obtaining maximum beamforming gains. In this paper, we first propose

In this work, we investigate linear precoding for secure spatial modulation. With secure spatial modulation, the achievable secrecy rate does not have an easy-to-compute mathematical expression, and hence, has to be evaluated numerically, which leads to high complexity in the optimal precoder design. To address this issue, an accurate and analytical approximation of the secrecy rate is derived in this