Communication Systems - Science topic

In this paper, a functioning bandpass filter designed, simulated and implemented for potential use in the front-end framework of the Ultra-High Frequency (UHF) Radio Frequency Identification (RFID) receiver is presented. The RFID communications in the UHF domain operate in the frequency range from 860 to 960 MHz as such many other communication sys...

This paper introduces a novel 5-port MIMO antenna tailored for the 24–40 GHz frequency range, with a focus on applications such as n257, n258 satellite-to-ground communication, and n259, n260 NR 5G with material-based analysis. Fr4 and Roger substrate are used to analyze the approaches for the proposed antenna, and Roger substrate is suitable for d...

Avionics systems of an Unmanned Aerial Vehicle (UAV) or drone are the critical electronic components found onboard that regulate, navigate, and control UAV travel while ensuring public safety. Contemporary UAV avionics work together to facilitate success of UAV missions by enabling stable communication, secure identification protocols, novel energy...

Machine Learning for Radio Resource Management and Optimization in 5G and Beyond aims to highlight a new line of research that uses innovative technologies and methods based on AI/ML techniques to address issues and challenges related to radio resource management in 5G and 6G communication systems. This book provides comprehensive coverage of curre...

This paper introduces a new method for improving wireless communication systems by employing beyond diagonal reconfigurable intelligent surfaces (BD-RIS) and unmanned aerial vehicle (UAV) alongside deep reinforcement learning (DRL) techniques. BD-RIS represents a departure from traditional RIS designs, providing advanced capabilities for manipulati...

A metasurface inspired circularly polarized (CP) compact patch antenna with high gain for fifth-generation communication systems is designed and implemented in this article. The proposed structure features a corner truncated patch antenna and a metasurface of 3×3 double sided identical circular metallic patches. The attribute that puts this design...

This article studies the performance of the copper wire communication channel in the existence of the Middleton impulsive noise model. Differential chaos shift keying (DCSK) scheme is implemented with a noise reduction (NR) technique to mitigate the impulsive noise effect and improve system performance. The proposed communication system is simulate...

A wide-spatial coverage, low-profile, pattern reconfigurable, millimeter-wave antenna array designed for Vehicle-to-Everything (V2X) communication systems, crucial for fifth-generation wireless networks. The array features a hybrid structure and beam-scanning capabilities, ensuring extensive spatial coverage in the n257 band. Utilizing PIN diode-co...

Integrated Sensing and Communication (ISAC) systems have emerged as a key component for Sixth Generation (6G) networks, enhancing resource efficiency and enabling diverse applications. Currently, ISAC systems have been recognized as a leading trend for future standardization, i.e., International Mobile Telecommunications (IMT)-2030. As in the previ...

By introducing all IP networks together with IP TVs, smart homes, mobile phones, smartwatches, vehicle communication systems, etc. The demand for internet-based applications has increased which has also produced an increasing demand for bandwidth requirements in packet-switched networks. Thus, improving the system performance is now more important...

In this study, we present a dual-hop decode-and-forward relaying-based free-space optical (FSO) communication system. We consider utilizing simultaneous lightwave information and power transfer (SLIPT) with a time-splitting technique at the relay, where the direct current component of the received optical signal is harvested as a transmit power for...

Integrated sensing and communication (ISAC) is regarded as a promising technology for next-generation communication networks. As the demand for communication performance significantly increases, extremely large-scale antenna arrays and tremendously high-frequency bands get widely applied in communication systems, leading to the expansion of the nea...

Number of control visits for post-inpatient patients at the AFM Arosbaya clinic from the last 3 months of data in 2023 is around 31.4%, concluded that the number of control visits is low. One of the causes the low number of control visits is poor implementation of discharge planning, this is proven by research 1 which found that 66% of respondents...

High-power amplifiers are critical components in optical systems spanning from long-range optical sensing and optical communication systems to micromachining and medical surgery. Today, integrated photonics with its promise of large reductions in size, weight and cost cannot be used in these applications, owing to the lack of on-chip high-power amp...

This study explores the impact of the Risk-Based Internal Audit approach on improving risk management processes in Yemeni Islamic banks in Aden. The study focuses on four core RBIA functions: early identification, risk assessment, control evaluation, and monitoring and reporting. Data from eight banks were analyzed using SPSS, linear regression, an...

An adaptive polarization controller (APC) is crucial in mitigating carrier fading in a self-homodyne coherent detection (SHCD) system. In this paper, we propose a simplified APC design based on the X-cut, Y-propagating lithium niobate platform. Meanwhile, the alpha-beta filter is used to control the designed APC. The designed APC only needs one pha...

In this paper, we propose a microstrip antenna that incorporates a dual-polarization and bidirectional focusing metasurface (MS) for achieving high-gain transmission in circular polarization (CP) and reflection in linear polarization (LP) radiation, respectively. Initially, we design a MS that enables independent manipulation of the transmitted CP...

Recent advances in signal processing and AI-based inference enable the exploitation of wireless communication signals to collect information on devices, people, actions, and the environment in general, i.e., to perform Integrated Sensing And Communication (ISAC). This possibility offers exciting opportunities for Internet of Things (IoT) systems, b...

Integrated sensing and communication (ISAC) has become an attractive technology for future wireless networks. In this paper, we propose a simultaneous transmission and reflection reconfigurable intelligent surface (STAR-RIS) aided dynamic scatterers tracking scheme for ISAC in high mobility millimeter wave communication systems, where the STAR-RIS...

In this paper, a quasi-deterministic (Q-D) model for non-stationary underwater acoustic (UWA) channels is proposed. This model combines the BELLHOP deterministic model and geometry-based stochastic model (GBSM), which provides higher accuracy and flexibility. Different propagation components in shallow water are classified as D-rays, R-rays and F-r...

Slotted waveguide antenna (SWA) arrays are highly valued for their compact structure, high power handling capability, directivity, and efficiency, making them ideal for advanced radar and communication systems. In broad‐wall SWAs, side lobe levels (SLLs) are influenced by slot displacement from the waveguide centerline and slot inclination angles,...

The study undertook a critical analysis and focused on the African Communication system in Igbo land which is as old as man and Christian religion. This is because African traditional communication systems, values, cultures and beliefs exist in several forms in different parts of Igboland and witnessed a crossroads. This paper employed desk and eth...

The performance evaluation of sixth generation (6G) communication systems is anticipated to be a controlled and repeatable process in the lab, which brings up the demand for wireless channel emulators. However, channel emulation for 6G space-time-frequency (STF) non-stationary channels is missing currently. In this paper, a non-stationary multiple-...

Characterizing the performance trade-offs between sensing and communication subsystems is essential for enabling integrated sensing and communication systems. Various metrics exist for each subsystem; however, this study focuses on the ergodic capacity of the communication subsystem. Due to the complexity of deriving the sensing mean square error (...

Satellite–ground communication is a critical component in the global communication system, significantly contributing to environmental monitoring, radio and television broadcasting, aerospace operations, and other domains. However, the technology encounters challenges in data transmission efficiency, due to the drastic alterations in the communicat...

Based on the vision of global coverage for sixth-generation (6G) wireless communication systems, the low earth orbit (LEO) satellite-to-ground channel model for urban scenarios has emerged as highly important for the system design. In this paper, we propose an LEO satellite-to-ground channel model through shooting and bouncing rays (SBR) algorithm...

Respiratory diseases pose a significant threat to global public health, as exemplified by the COVID-19 pandemic. Molecular communication (MC), as a new method in communication systems, provides a framework for the modeling of diseases. Current studies, however, largely restrict MC models to transmission scenarios involving a single source and singl...

In this research, an 8-element multi-input multi-output (MIMO) antenna is presented for millimeter wave communication systems. The present design incorporates two circular rings cojoined with a monopole. Both the rings are cross-coupled for better radiation and less interference properties. The present MIMO structure is designed from the reference...

This paper explores the advancements and benefits of optical fiber technology in long-distance data transmission. We highlight the essential role optical fibers play in modern communication networks, emphasizing their superior bandwidth capabilities and lower latency compared to traditional copper infrastructures. Our study offers a comprehensive a...

Federated Learning (FL) paradigm has been very popular in the implementation of 5G and beyond communication systems as it provides necessary security for the users in terms of data. However, the FL paradigm is still vulnerable to model inversion attacks, which allow malicious attackers to reconstruct data by using the trained model gradients. Such...

The accelerating demand for wireless communication necessitates wideband, energy-efficient photonic sub-terahertz (sub-THz) sources to enable ultra-fast data transfer. However, as critical components for THz photonic mixing, photodiodes (PDs) face a fundamental trade-off between quantum efficiency and bandwidth, presenting a major obstacle to achie...

The use of pens in human-computer interaction has been investigated since Ivan Sutherland's Sketchpad graphical communication system in the early 1960s. We provide an overview of the major developments in pen-based interaction over the last six decades and compare different hardware solutions and pen-tracking techniques. In addition to pen-based in...

The flexible control of electromagnetic (EM) waves across the entire spatial domain is a long‐standing aspiration in metasurface research, driven by its potential to enhance signal coverage and channel capacity. However, most existing full‐space metasurfaces are restricted to manipulating incidence within one specific half‐space, failing to exploit...

The navigation and radio communication systems experience significant disruptions due to post‐sunset equatorial ionospheric irregularities. There is ongoing debate regarding the impact of meridional/trans‐equatorial wind speed on these irregularities, though it is widely agreed that the Pre‐Reversal Enhancement (PRE) plasma vertical drift velocity...

The continuous advancements in multi-mode detection and surveillance technologies have made multispectral-compatible camouflage increasingly vital for both defense and civilian applications. Meanwhile, stealth radomes require in-band communication of electromagnetic signals. This paper presents a multifunctional metasurface that provides multispect...

This research addresses the phenomenon of bilingualism within the field of linguistics, which has examined various phenomena associated with linguistic realities across all languages. Scholars have acknowledged that language is a system governed by different mechanisms that vary from one language to another at all levels. The phenomenon of linguist...

In non-geostationary orbit (NGSO) satellite communication systems, effectively utilizing beam hopping (BH) technology is crucial for addressing uneven traffic demands. However, optimizing beam scheduling and resource allocation in multi-NGSO BH scenarios remains a significant challenge. This paper proposes a multi-NGSO BH algorithm based on deep re...

The demand for high-capacity communication systems has grown exponentially in recent decades, constituting a technological field in constant change. Data transmission at high rates, reaching tens of Gb/s, and over distances that can reach hundreds of kilometers, still faces barriers to improvement, such as distortions in the transmitted signals. Su...

With the rapid development of technology, the Internet of Vehicles (IoV), as a crucial component of intelligent transportation systems, is undergoing profound changes. This review focuses on the frontier field of Integrated Sensing, Communication, and Computation (ISCC) for the IoV towards 6G. It begins by elaborating on its research background and...

Mobile Ad Hoc Networks (MANETs) are increasingly replacing conventional communication systems due to their decentralized and dynamic nature. However, their wireless architecture makes them highly vulnerable to flooding attacks, which can disrupt communication, deplete energy resources, and degrade network performance. This study presents a novel hy...

This article presents a broadband circularly polarized four-port multiple-input–multiple-output (MIMO) antenna with high isolation is presented in this article. The proposed MIMO antenna consists of four octal-shaped monopole antennas with common ground is realized and fabricated on FR-4 (εr 4.3) substrate with a thickness of 1.6 mm and a size of 1...

Massive MIMO (Multiple-Input Multiple-Output) is an advanced wireless communication technology, using a large number of antennas to improve the overall performance of the communication system in terms of capacity, spectral, and energy efficiency. The performance of MIMO systems is highly dependent on the quality of channel state information (CSI)....

This paper designs a novel centrosymmetric double-layer nested antiresonant fiber (CDNAF) with few-mode transmission characteristics. The cladding structure of the CDNAF incorporates glass plates and multilayer capillaries, effectively mitigating the coupling between various core modes and cladding modes. Simulation results show that the CDNAF can...

This paper presents a novel design approach for an anomalous reflector metasurface for communication systems operating at 8 GHz band. The main contribution of this work is the development of a general analytical method that accurately calculates the electromagnetic response of realistic metasurfaces with periodic impedance profiles. The modulated s...

Radio‐frequency (RF) fingerprinting is an emerging technology for advanced device authentication. This work addresses the issue by improving both the algorithm and hardware to target real‐time AI processing in communication systems. Here, efficient real‐time communication system using canonical cortical graph neural network with high‐level target n...

Due to the serious challenge for mobile operators as a result of spectrum congestion in radio frequency spectrum, free space optical (FSO) communication has been considered a timeous alternative especially for future generation high capacity wireless networks. Although FSO offers advantages such as huge data carrying capacity among others, it suffe...

The proliferation of electronic devices has given rise to electromagnetic interference (EMI), which can cause malfunction in electronic devices and disrupt wireless communication systems. Polymers in their pure form exhibit limited EMI shielding properties due to their inherently low electrical conductivity. A promising approach to address this lim...

DL-based automatic modulation classification (AMC) models are highly susceptible to adversarial attacks, where even minimal input perturbations can cause severe misclassifications. While adversarially training an AMC model based on an adversarial attack significantly increases its robustness against that attack, the AMC model will still be defensel...

Movable antennas (MAs) enhance flexibility in beamforming gain and interference suppression by adjusting position within certain areas of the transceivers. In this paper, we propose an MA-assisted integrated sensing and communication framework, wherein MAs are deployed for reconfiguring the channel array responses at both the receiver and transmitt...

Micro light-emitting diodes (µLEDs), crucial for advanced displays and communication systems, face efficiency challenges due to sidewall defects. This study investigates the impact of various passivation layers, including SiO2, Al2O3, and HfO2, on AlGaInP-based 620 nm red µLEDs. We fabricated devices with two mesa sizes and demonstrated that atomic...

This paper presents an architecture based on the MANET (Mobile Ad Hoc Network) paradigm as an emergency communication system between users of electric bicycles. The solution consists of 4 mobile nodes representing the users and a main fixed node, which emulates a bicycle docking station. This architecture allows multi-hop communication between the...

The reliability of power communication networks is vital to ensure uninterrupted operation in power electronics. Self-healing techniques address this need by automating fault identification and recovery. However, existing methods struggle with dynamic challenges like voltage fluctuations, thermal overloads, and multidimensional sensor data, often l...

This research article presents the comprehensive design and analysis of a 2.45 GHz RF power amplifier operating at 40 dBm using GaN technology. The amplifier is built around the CGH40010F transistor and employs a Linearization with Nonlinear Components Method (LINC) for enhanced linearity. The study outlines the design methodology, including the se...

In this paper, we demonstrated a novel bidirectional high-speed transmission system integrating a free-space optical (FSO) communication with a 5G wireless link, utilizing a high-power erbium-doped fibre amplifier (EDFA) for enhanced loss compensation. The system supports downlink rates of 1-Gb/s/4.5-GHz and 10-Gb/s at 24-GHz and 39-GHz, and an upl...

The dual function radar and communication technology plays a crucial role in Internet of Vehicles. However, fewer studies have focused on optimizing the joint performance of sensing and communication in full‐duplex Internet of Vehicles while considering fairness. Therefore, this paper considers the scenario that the full‐duplex gNB employs dual fun...

The development of dual‐mode organic photodetectors (OPDs) greatly improves its functionality by enabling selective spectral detection. This study presents a unidirectional bias‐switchable dual‐mode OPD that leverages selective carrier extraction through the manipulation of light field distributions and non‐equilibrium transport dynamics. This dual...

A transmission-type 2-bit coding polarization conversion metasurface with radiation function is proposed in this paper. Polarization conversion is realized by two layers of grating structure and polarization conversion structure layer. Compared with conventional polarization conversion metasurface which is composed of two orthogonal grating layers...

The 6G Key Technologies, Applications, and Challenges training by Tonex offers an in-depth exploration of the next-generation wireless communication system. This course provides insights into 6G technologies, their transformative applications, and the challenges shaping their deployment. Attendees will understand the evolution from 5G to 6G and the...

This paper presents a scalable reflective metasurface design optimized for 5G and beyond (B5G) wireless communications, featuring a unique combination of passive metasurface elements. The proposed design emphasizes a less complex structural configuration, facilitating easy scalability and cost-effective fabrication. By implementing a single-layer s...

Channel Autoencoders (CAEs) have shown significant potential in optimizing the physical layer of a wireless communication system for a specific channel through joint end-to-end training. However, the practical implementation of CAEs faces several challenges, particularly in realistic and dynamic scenarios. Channels in communication systems are dyna...

A high security physical layer encryption scheme for dual-mode orthogonal frequency division multiplexing with index modulation (DM-OFDM-IM) in magnetic induction communication is proposed. The scheme utilizes DM-OFDM-IM, where subcarriers within each subblock are divided into two groups, each modulated by distinct signal constellations. DM-OFDM-IM...