Artigos de revistas: "Wireless communication systems"

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Mistry, Vrushank. "Wireless Communication Technologies in HVAC Control Systems". International Journal of Science and Research (IJSR) 7, n.º 7 (5 de julho de 2018): 1537–43. http://dx.doi.org/10.21275/sr24203192628.

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Prasad, R. "Wireless Broadband Communication Systems". IEEE Communications Magazine 35, n.º 1 (janeiro de 1997): 18. http://dx.doi.org/10.1109/mcom.1997.568189.

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Ghassemlooy, Zabih, Stanislav Zvanovec, Mohammad-Ali Khalighi, Wasiu O. Popoola e Joaquin Perez. "Optical wireless communication systems". Optik 151 (dezembro de 2017): 1–6. http://dx.doi.org/10.1016/j.ijleo.2017.11.052.

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Kumar, Nitin. "Investigation and Analysis of the Impact of Interference on Wireless Communication Systems". Mathematical Statistician and Engineering Applications 70, n.º 2 (26 de fevereiro de 2021): 1010–18. http://dx.doi.org/10.17762/msea.v70i2.2154.

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Wireless communication systems are widely used in modern society, and their reliability is paramount to ensure effective communication. The aim of this investigation is to analyze the effects of interference on wireless communication systems. Interference is a major issue in wireless communication systems and can significantly degrade the system's performance. This paper presents a survey of investigations into the effect of interference on wireless communication systems. It provides an overview of the various types of interference and their effects on wireless communication systems, as well as techniques used to mitigate interference in wireless communication systems. It also reviews recent research on interference in wireless communication systems, which has shown that interference can significantly degrade the performance of wireless communication systems. The paper also discusses the challenges and future directions in the investigation of interference in wireless communication systems, such as the development of interference models that accurately capture the complex nature of interference, the design of interference mitigation techniques that can adapt to changing interference conditions, and the optimization of wireless communication systems to minimize the impact of interference. Finally, the survey highlights the importance of investigating the effect of interference on wireless communication systems and provides a comprehensive overview of the various techniques used to mitigate interference.

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Kawade, S., e T. Hodgkinson. "Licence-exempt wireless communication systems". BT Technology Journal 25, n.º 2 (abril de 2007): 64–75. http://dx.doi.org/10.1007/s10550-007-0029-1.

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Yang, Qingyan, Virginia Sisiopiku, Jim A. Arnold, Paul Pisano e Gary G. Nelson. "Assessment of Rural Intelligent Transportation System Wireless Communications Solutions". Transportation Research Record: Journal of the Transportation Research Board 1739, n.º 1 (janeiro de 2000): 51–58. http://dx.doi.org/10.3141/1739-07.

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Rural transportation systems have different features and needs than their urban counterparts. To address safety and efficiency concerns in rural environments, advanced rural transportation systems (ARTS) test and deploy appropriate intelligent transportation systems (ITS) technologies, many of which require communication support. However, wireless communication systems that currently serve urban areas often are not available or suitable in rural environments. Thus, a need exists to identify communication solutions that are likely to address successfully the needs and features of ARTS applications. Current and emerging wireless communications systems and technologies have been systematically assessed with respect to rural ITS applications. Wireless communication functions associated with rural ITS functions are first identified. Then requirements for applicable communication technologies in the rural environment are defined. Existing and emerging wireless communication systems and technologies are reviewed and evaluated by a systematic process of assessing rural ITS wireless solutions. Finally, recommendations for future research and operational tests are offered. The analysis results are expected to benefit rural ITS planners by identifying suitable wireless solutions for different rural contexts.

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Javornik, Tomaž, Andrej Hrovat e Aleš Švigelj. "Radio Technologies for Environment-Aware Wireless Communications". WSEAS TRANSACTIONS ON COMMUNICATIONS 21 (31 de dezembro de 2022): 250–66. http://dx.doi.org/10.37394/23204.2022.21.30.

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The contemporary wireless transmitter in addition to information symbols transmits also training symbols in order to help the receivers in the estimation of the information symbols by estimating the channel state information (CSI). In this paper, we look at existing wireless communication technologies in light of environment-aware wireless communications, which is a new concept of wireless communications that queries the time-invariant CSI from the local or global database, using information about the transmitter and receiver location. Thus, this study is the first critical review of the potential of today’s terrestrial wireless communication systems including wireless cellular technologies (GSM, UMTS, LTE, NR), wireless local area networks (WLANs), and wireless sensor networks (WSNs), for estimating CSI, the ratio between training and information symbols and the rate of channel variation, and the potential use of time invariable CSI in environment aware wireless communications. The research reveals, that early communication systems provide means for narrowband channel estimation and the CSI is only available as channel attenuation based on signal level measurements. By increasing the frequency bandwidth of communications, the CSI is estimated in some form of channel impulse response (CIR) in almost all currently used radio technologies, but this information is generally not available outside the communication systems. Also, the CSI is estimated only for the channel with active communications. The new radio technology (NR) offers the possibility of estimating the CIR for non-active channels as well, and thus the possibility of initiating environmentally aware wireless communications.

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Balador, Ali, Anis Kouba, Dajana Cassioli, Fotis Foukalas, Ricardo Severino, Daria Stepanova, Giovanni Agosta et al. "Wireless Communication Technologies for Safe Cooperative Cyber Physical Systems". Sensors 18, n.º 11 (21 de novembro de 2018): 4075. http://dx.doi.org/10.3390/s18114075.

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Cooperative Cyber-Physical Systems (Co-CPSs) can be enabled using wireless communication technologies, which in principle should address reliability and safety challenges. Safety for Co-CPS enabled by wireless communication technologies is a crucial aspect and requires new dedicated design approaches. In this paper, we provide an overview of five Co-CPS use cases, as introduced in our SafeCOP EU project, and analyze their safety design requirements. Next, we provide a comprehensive analysis of the main existing wireless communication technologies giving details about the protocols developed within particular standardization bodies. We also investigate to what extent they address the non-functional requirements in terms of safety, security and real time, in the different application domains of each use case. Finally, we discuss general recommendations about the use of different wireless communication technologies showing their potentials in the selected real-world use cases. The discussion is provided under consideration in the 5G standardization process within 3GPP, whose current efforts are inline to current gaps in wireless communications protocols for Co-CPSs including many future use cases.

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Michalski, Wojciech. "Evolutionary paths in wireless communication systems". Journal of Telecommunications and Information Technology, n.º 3 (30 de setembro de 2005): 105–11. http://dx.doi.org/10.26636/jtit.2005.3.318.

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The paper contains a review and analysis of evolutionary paths of seven most important, from network development strategy point of view, wireless communication systems, especially the WLAN operating according to the IEEE 802.11 standard. With respect to WLAN, trends related to evolution toward mobile network and self organizing network as well as toward integration of WLAN and GSM using GPRS are presented. Concerning WLAN architecture development, evolution paths toward distributed controlled network as well as centrally coordinated and controlled network are described. Moreover, analysis includes cellular mobile radio systems, wireless personal networks, wide area wireless packet data systems, satellite-based mobile systems, paging/messaging systems and cordless telephones. With respect to these systems, general evolution process and trends associated with this process are described.

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Bai, Xinyue. "Design of UAV wireless communication system". Journal of Physics: Conference Series 2649, n.º 1 (1 de novembro de 2023): 012061. http://dx.doi.org/10.1088/1742-6596/2649/1/012061.

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Abstract The increasing demand for communication has led to a surge in the development and deployment of wireless communication technology in unmanned aerial vehicles (UAVs). As a result, there has been extensive research conducted on UAV wireless communication systems over the past five years. This article provides an overview of the advancements made in three key areas of research: transmission of UAV wireless communication systems, wireless communication networks, and design optimization of UAV wireless communication systems. The article summarizes the existing literature on these topics and highlights the main findings and challenges faced by researchers. In addition, it explores the principles and implementation approaches of three types of UAV wireless communication systems, including a UAV wireless communication system, a UAV wireless transmission system based on the AD9361+ZYNQ7045 platform, and a UAV communication system based on wireless data transmission module. Overall, the research in UAV wireless communication systems has shown great potential for future applications in various fields such as aerial photography, disaster monitoring, and search and rescue operations. By improving the efficiency and reliability of wireless communication between UAVs, the technology can enhance their performance and increase their usefulness in a range of industries.

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Chae, Chan-Byoun, Antonio Forenza, Robert Heath, Matthew McKay e Iain Collings. "Adaptive MIMO transmission techniques for broadband wireless communication systems [Topics in Wireless Communications". IEEE Communications Magazine 48, n.º 5 (maio de 2010): 112–18. http://dx.doi.org/10.1109/mcom.2010.5458371.

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Han, Daxiao. "An overview of 6G wireless systems". Applied and Computational Engineering 35, n.º 1 (22 de janeiro de 2024): 50–55. http://dx.doi.org/10.54254/2755-2721/35/20230359.

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With the demand of low latency communication explodes, the inherent limitations of the fifth generation communication is constantly exposed to the public. Such 5G shortcomings are spurring worldwide activities focused on defining the next-generation 6G wireless communication system. So the paper offers an overview of 6G wireless systems based on existing literature and statistical data. The paper concentrate on the driving forces in the development of 6G. In the meanwhile, the paper presents some potential application scenarios in the future. In the last section, the paper points out some challenges that are most likely to encounter in the coming development of 6G. Based on current prospect of 6G, it is likely that 6G features low latency and high efficiency and has 100 times better transmission capacity than 5G. The future applications are holographic telecommunications, mutual interaction of emotional thinking, and digital twinning. In conclusion, integrated with different technologies like AI,Terahertz Communications, and blockchain, 6G features many advantages and will permeate into peoples daily lives.

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Briso-Rodríguez, César, Ke Guan, Yin Xuefeng e Thomas Kürner. "Wireless Communications in Smart Rail Transportation Systems". Wireless Communications and Mobile Computing 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/6802027.

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Railway, subway, airplane, and other transportation systems have drawn an increasing interest on the use of wireless communications for critical and noncritical services to improve performance, reliability, and passengers experience. Smart transportation systems require the use of critical communications for operation and control, and wideband services can be provided using noncritical communications. High speed train (HST) is one of the best test cases for the analysis of communication links and specification of the general requirements for train control and supervision, passenger communications, and onboard and infrastructure wireless sensors. In this paper, we analyze in detail critical and noncritical networks mainly using the HST as a test case. First, the different types of links for smart rail transportation are described, specifying the main requirements of the transportation systems, communications, and their applications for different services. Then, we propose a network architecture and requirements of the communication technologies for critical and noncritical data. Finally, an analysis is made for the future technologies, including the fifth-generation (5G) communications, millimeter wave (mmWave), terahertz (THz), and satellites for critical and high-capacity communications in transportation.

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Seymour, Tom, e Ali Shaheen. "History of Wireless Communication". Review of Business Information Systems (RBIS) 15, n.º 2 (11 de abril de 2011): 37–42. http://dx.doi.org/10.19030/rbis.v15i2.4202.

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The history of communication is an exciting topic. This article reviews various areas that makeup the current history of wireless communication. These topics include: the wireless vision, generations of wireless, technical issues, current wireless systems, wireless LaNs, Wide Area Wireless Data Services, Broadband Wireless Access, Satellite Wireless Access, Satellite Networks, and Bluetooth and this material will stimulate you to do more research in these various areas of the wireless industry.

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Kang, Yoohwa, Sunwoo Lee, Songi Gwak, Taekyeong Kim e Donghyeok An. "Time-Sensitive Networking Technologies for Industrial Automation in Wireless Communication Systems". Energies 14, n.º 15 (26 de julho de 2021): 4497. http://dx.doi.org/10.3390/en14154497.

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The fourth industrial revolution is accelerating industrial automation. In industrial networks, manufacturing processes require hard real-time communication where the latency is less than 1ms. Time-sensitive networking (TSN) technology over Ethernet already supports deterministic delivery for real-time communication. However, TSN technologies over wireless networks are currently in their initial development stage. Therefore, this study presents an overview of TSN research trends in wireless communications. This paper focuses on 5G networks and IEEE 802.11. We summarize standardization trends for TSN in 5G networks and introduce the TSN technologies for 802.11-based WLAN. Then, we introduce the integration scenario of 5GS with WLAN. This study provides insights into wireless communication technologies for wireless TSN.

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Akhibi, Samuel D. "Trends in Automotive Communication". International Journal of Network and Communication Research 7, n.º 1 (15 de janeiro de 2022): 1–13. http://dx.doi.org/10.37745/ijncr.16/vol7n1113.

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Modern vehicles are complex cyber-physical systems where communication protocols designed for physically isolated networks are now employed to connect Internet-enabled devices. This paper presents an overview of wireless automotive communication technologies and the Interference Rejection Combining Approach in Vehicle Communication systems with the aim of identifying the strong candidates for future in-vehicle and inter-vehicle automotive applications. The paper ﬁrst gives an overview of automotive applications relying on wireless communications, with a particular focus on key networking technologies used for in-vehicle and inter-vehicle applications then on Interference Rejection Combining Approach in Vehicle Communication systems.

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Bharathi, Anantha. "SMART ANTENNAS FOR WIRELESS COMMUNICATION SYSTEMS". CVR Journal of Science and Technology 1, n.º 1 (1 de outubro de 2011): 37–40. http://dx.doi.org/10.32377/cvrjst0108.

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Shaqfeh, Mohammad Obaidah. "Novel Reduced-Feedback Wireless Communication Systems". Qatar Foundation Annual Research Forum Proceedings, n.º 2011 (novembro de 2011): CSP14. http://dx.doi.org/10.5339/qfarf.2011.csp14.

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Juan, Hung-Hui, e Chingyao Huang. "Analytical model for wireless communication systems". IEEE Communications Letters 14, n.º 6 (junho de 2010): 569–71. http://dx.doi.org/10.1109/lcomm.2010.06.090400.

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Saidane, A. "Wireless Communication Technologies: New Multimedia Systems". Microelectronics Journal 32, n.º 9 (setembro de 2001): 787–88. http://dx.doi.org/10.1016/s0026-2692(01)00051-9.

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Hara, Shinsuke, Hiroyuki Yomo, Petar Popovski e Kazunori Hayashi. "New Paradigms in Wireless Communication Systems". Wireless Personal Communications 37, n.º 3-4 (31 de maio de 2006): 233–41. http://dx.doi.org/10.1007/s11277-006-9036-7.

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Trivedi, Kishor S., Xiaomin Ma e S. Dharmaraja. "Performability modelling of wireless communication systems". International Journal of Communication Systems 16, n.º 6 (2003): 561–77. http://dx.doi.org/10.1002/dac.605.

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Daneshgaran, Fred, e Josef Noll. "Special issue: Reconfigurable wireless communication systems". Wireless Communications and Mobile Computing 2, n.º 8 (2002): 785–87. http://dx.doi.org/10.1002/wcm.117.

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Hadi, Teeb Hussein. "Types of Attacks in Wireless Communication Networks". Webology 19, n.º 1 (20 de janeiro de 2022): 718–28. http://dx.doi.org/10.14704/web/v19i1/web19051.

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One of the most important types that used to transfer data between nodes without using wires is a “wireless communication network”, where the transmission of data is censored remotely by using electromagnetic waves such as radio waves that usually implemented in the physical layer of the network. Continuous improvements in wireless network technology have reduced the security and speed differences between types of networks (wired and wireless), but in turn, increased security threats to wirelessly transmitted data. Wireless networks are weak in terms of "privacy protection" because anyone who is within the coverage area of a wireless network can attempt to break into that network. Hacking incidents have been reported frequently in places with shared free networks, and it has been observed that the places of open distributed networks of the Internet are most at risk of complete penetration of your phone or PC data. To solve this problem, several programs have been developed that provide protection for wireless networks that differ in terms of security. Some of them did not provide sufficient protection for wireless networks, such as Wired Equivalent Privacy (WEP), and others made progress in preventing intrusions compared to their predecessors, such as Wi-Fi Protected Access (WPA).

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Leccese, Fabio, e Giuseppe Schirripa Spagnolo. "LED-to-LED wireless communication between divers". ACTA IMEKO 10, n.º 4 (30 de dezembro de 2021): 80. http://dx.doi.org/10.21014/acta_imeko.v10i4.1177.

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<p class="Abstract">For military divers, having a robust, secure, and undetectable wireless communication system available is a fundamental element. Wireless intercoms using acoustic waves are currently used. These systems, even if reliable, have the defect of being easily identifiable and detectable. Visible light can pass through sea water. Therefore, light can be used to develop short-range wireless communication systems. To realize secure close-range underwater wireless communication, the Underwater Optical Wireless Communication (UOWC) can be a valid alternative to acoustic wireless communication. UOWC is not a new idea, but the problem of the presence of sunlight and the possibility of using near-ultraviolet radiation (near-UV) has not been adequately addressed in the literature yet. In military applications, the possibility of using invisible optical radiation can be of great interest. In this paper, a feasibility study is carried out to demonstrate that UOWC can be performed using near-ultraviolet radiation. The proposed system can be useful for wireless voice communications between military divers as well as amateur divers.</p>

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Zhou, Yangbin. "Inter-symbol Anti-interference Algorithm for 5G Communication System Based on Deep Learning". Highlights in Science, Engineering and Technology 70 (15 de novembro de 2023): 553–61. http://dx.doi.org/10.54097/hset.v70i.13965.

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As a matter of fact, the fifth generation (5G) wireless technology requires huge capacity to ensure normal use of communications, and a large amount of data will cause interference between wireless communication systems. With this in mind, to reduce inter-symbol interference in wireless systems, MIMO-OFDM is employed, the rapid growth of deep learning has the potential to significantly enhance wireless system performance. In reality, applying deep learning to estimate channels in MIMO-OFDM systems can reduce channel errors as well as improve channel quality, thereby greatly reducing inter-code interference between systems. On this basis, this paper introduces various DL-based channel estimation and demonstrates its improvement in the efficiency of the system. According to the analysis, the usage of deep learning in 5G wireless communication systems has great advantages. In addition, the limitations and defects are also discussed at the same time. Overall, these results shed light on guiding further exploration of 5G communication.

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Zhelev, Stefan. "Comparative analysis of the probability in digital wireless communication systems". Journal scientific and applied research 2, n.º 1 (3 de março de 2012): 21–27. http://dx.doi.org/10.46687/jsar.v2i1.38.

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Digital signals dominate satellite communications systems. A measure the quality of digital signals is Bit Error Rate (BER) and Symbol Error Rate (SER). The main purpose of the paper is a comparison of the probability of error for various modulation and demodulation schemes used in digital communications systems (DCS) for transmitting information over channel. Error Rate parameters are resulting analytically, not experimentally.

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Unterhuber, Paul, Stephan Pfletschinger, Stephan Sand, Mohammad Soliman, Thomas Jost, Aitor Arriola, Iñaki Val et al. "A Survey of Channel Measurements and Models for Current and Future Railway Communication Systems". Mobile Information Systems 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/7308604.

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Modern society demands cheap, more efficient, and safer public transport. These enhancements, especially an increase in efficiency and safety, are accompanied by huge amounts of data traffic that need to be handled by wireless communication systems. Hence, wireless communications inside and outside trains are key technologies to achieve these efficiency and safety goals for railway operators in a cost-efficient manner. This paper briefly describes nowadays used wireless technologies in the railway domain and points out possible directions for future wireless systems. Channel measurements and models for wireless propagation are surveyed and their suitability in railway environments is investigated. Identified gaps are pointed out and solutions to fill those gaps for wireless communication links in railway environments are proposed.

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WITKOWSKI, Marek. "SECURITY OF ICT SYSTEMS IN CRISIS MANAGEMENT". Scientific Journal of the Military University of Land Forces 162, n.º 4 (1 de outubro de 2011): 80–90. http://dx.doi.org/10.5604/01.3001.0002.3179.

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The article presents ICT (Information and Communication Technology) networks and systems that are used to provide communications for crisis management purposes. The articles describes wired and wireless communication assets and discusses their advantages and disadvantages when they are used to carry out national security tasks.

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Jihad, Noor J., e Murooj A. Abd Almuhsan. "Future trends in optical wireless communications systems: Review". Technium: Romanian Journal of Applied Sciences and Technology 13 (15 de setembro de 2023): 53–67. http://dx.doi.org/10.47577/technium.v13i.9474.

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Optical fibers are frequently used in data transmission systems, Because of their ability to transmit large amounts of information and dielectric nature. In central, metropolitan, or broad-area applications, network topologies incorporating many wavelengths per optical fiber are utilized to connect thousands of users with a wide variety of transmission rates and capacities. The simultaneous transmission of many wavelengths over a fiber with a nm range of 1300 to 1600 is a potent characteristic of an Optical communication network. Wavelength division multiplexing (WDM) is a method for combining various wavelengths onto a single fiber. The WDM concept, when combined with optical amplifiers, produces communication lines that enable quick communication between users across national borders. An overview of the difficulties with fiber-optic communication is provided in this paper. The areas that will be most important for the development of optical communications in the future are outlined in this study. Modern optical fibers and integrated optics were both developed in the dominion of optical machinery and parts. Optical fiber communication systems are widely used for high-speed data transmission over long distances. There are some specific details and examples of optical fiber communication systems such as Fiber Optic Cables, Light Sources, optical modulator, optical amplifier, optical receivers, fiber optical network, medical applications.

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Manda, Rajarao. "A Low-Power, High-Bandwidth Wireless Communication System for Industrial IoT Applications". Mathematical Statistician and Engineering Applications 71, n.º 2 (6 de março de 2022): 647–57. http://dx.doi.org/10.17762/msea.v71i2.2194.

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In anticipation for an automated future, the Internet of Things (IoT) has rapidly connected more gadgets. Thus, IoT applications' performance requirements present new challenges. Power consumption, service quality, localization, security, and exact wireless channel propagation modelling and characterization are potential issues. When connecting separate sensors wirelessly, the latter is crucial. Channel modelling varies by location because environmental factors affect wireless signal range and quality. Wireless communication technologies are widely used for disaster victim and responder tracking and machine health monitoring in networked manufacturing. Data communication in such systems must be real-time or risk financial losses or human lives. Facilitating real-time medium access via license-free bands in uncontrolled situations is difficult because all communicating stations must be synchronized. (real and nonreal-time). In open communication, medium access protocols cannot filter out unmonitored station traffic.Real-time data collection and analysis improve system efficiency, preventative maintenance, and energy savings. Modulation systems, antenna designs, and power management are just a few of the various ways that must be considered throughout system design and development. IIoT applications also have power, security, and dependability issues. A Low-Power, High-Bandwidth Wireless Communication System for Industrial IoT Applications has a bright future thanks to artificial intelligence and machine learning, 5G networks, new low-power communication technologies, improved security, and blockchain technology. Without this technology, IIoT growth is impossible.

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Li, Yuhua, Lishuang Wan e Haimin Zhang. "Communication Network for Sports Activity Monitoring Systems". Complexity 2021 (17 de abril de 2021): 1–10. http://dx.doi.org/10.1155/2021/9971605.

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In this paper, through research and analysis of the communication network of the physical activity monitoring system, we combine wearable technology and identification technology and design a physical health monitoring bracelet that integrates multifaceted physical data collection and effective identity matching function. We match the identity through the chip and collect the physical fitness data generated in the process of exercise and centralized test by the sensor in real-time. Finally, the data transmission is realized through the WIFI communication function to achieve the purpose of monitoring physical exercise and improving physical quality. To ensure the continuity and stability of information transmission, the joint transmission method of direct transmission and indirect transmission is essential. Besides, considering the energy causality limitation of sensor nodes and relay nodes, a collaborative transmission model of wireless body area network based on wireless cognitive network is constructed. And, a power allocation algorithm based on maximum ratio merging and wireless cognitive network is proposed, which puts forward a new idea for the future research of wireless body area network resource allocation.

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Belicheva, K. V., R. S. Yonushauskayte e S. A. Pavlov. "Prospects for visible color for underwater wireless broadband communications". Applied photonics 10, n.º 7 (28 de dezembro de 2023): 91–116. http://dx.doi.org/10.15593/2411-4375/2023.7.07.

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Nowadays, underwater wireless communications are realized through communication systems based on acoustic waves, electromagnetic waves (radiofrequency waves and low frequency waves), magnetic induction and visible light. This paper provides a basic problems and key aspects in the development of underwater wireless optical communication systems. The latter attracts considerable interest from science, industry and ecology as an effective solution to satisfy the rapidly increasing demands of underwater high data-rate transmission on at any depth. However, severe aquatic channel conditions (absorption, scattering, turbulence, etc.) significantly reduce the attainable communication ranges. The second serious problem limiting the functioning of wireless optical communication systems is the difficulty of aligning the transmitter beam with the receiver's field of view. Two main types between transmitter and receiver are considered: diffuse line-of-sign (wide-beam) configuration and point-to-point light-of-sign (narrow-beam) configuration. Diffuse line-of-sign communication have reduced alignment requirements, but data rates and distances are noticeably lower than in narrow-beam systems. The main technical solutions for adjusting the receiver and transmitter in narrow-beam communication systems are discussed in this paper.

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Gutiérrez, Juan Felipe, e Jesús María Quintero. "Visible Light Communication". Revista Ontare 10 (5 de dezembro de 2022): 26. http://dx.doi.org/10.21158/23823399.v10.n1.2022.3538.

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This work presents a general and introductory review of visible light communication. Visible light communication or VLC refers to wireless communications using a spectral range from 380 to 780 nm for the transmission of information. This part of the optical-electromagnetic range presents some advantages to current wireless radio frequency technologies, as well as several challenges to its development and application. Different visible light communication systems have been developed for indoor, outdoor, domestic, and industrial fields where the luminaire performs two tasks: general lighting and data transmission, since this type of communication has important and valuable applications. Recently, research has been performed to improve each functional block’s performance that composes this kind of communication system. The incursion VLC poses challenges such as LED bandwidth limited by the carrier lifetime, the LED-Driver Linearity, it’s up-link; the general lighting infrastructure to the internet; and the dimming and general lighting performance. It is concluded that the incursion of Visible Light Communication into the already extended spectrum of wireless communications systems will complement and make it less harmful to our environment as international regulation has helped to improve this technology substantially.

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Solyman, Ahmad A. A., e Ismail A. Elhaty. "Potential key challenges for terahertz communication systems". International Journal of Electrical and Computer Engineering (IJECE) 11, n.º 4 (1 de agosto de 2021): 3403. http://dx.doi.org/10.11591/ijece.v11i4.pp3403-3409.

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The vision of 6G communications is an improved performance of the data rate and latency limitations and permit ubiquitous connectivity. In addition, 6G communications will adopt a novel strategy. Terahertz (THz) waves will characterize 6G networks, due to 6G will integrate terrestrial wireless mobile communication, geostationary and medium and low orbit satellite communication and short distance direct communication technologies, as well as integrate communication, computing, and navigation. This study discusses the key challenges of THz waves, including path losses which is considered the main challenge; transceiver architectures and THz signal generators; environment of THz with network architecture and 3D communications; finally, Safety and health issues.

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Belda, Květoslav, Václav Rychnovský e Pavel Píša. "Wireless communication for control of manipulation systems". Archives of Control Sciences 22, n.º 1 (1 de janeiro de 2012): 29–41. http://dx.doi.org/10.2478/v10170-011-0010-6.

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Wireless communication for control of manipulation systemsThe paper deals with a novel application of the wireless data communication for a continual control of the distributed manipulation systems. The solution is intended for industrial robotic plants. A considered way of the wireless communication is based on ZigBee protocol. The protocol is tested for a real time bidirectional data communication within a manipulation system. The system consists of several moving manipulation units, several stationary auxiliary units and one control computer. The computer provides the cooperation of all units in the system in relation to the user requirements. The system is controlled by a simple feedback multi-level control realized in MATLAB - Simulink environment. The paper is focused on the realization of the boards of power electronics, transmitters, optical positional sensors, optical gates and their networking in accordance with ZigBee protocol definition. The behavior of the ZigBee is illustrated by several records from real experiments.

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Abdourahamane, Ali. "ADVANTAGES OF OPTICAL ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING IN COMMUNICATIONS SYSTEMS". EUREKA: Physics and Engineering 2 (31 de março de 2016): 27–33. http://dx.doi.org/10.21303/2461-4262.2016.00058.

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The role of the optical transmitter is to generate the optical signal, impose the information bearing signal, and launch the modulated signal into the optical fiber. The semiconductor light sources are commonly used in state-of-the-art optical communication systems. Optical communication systems has become one of the important systems after the advent of telephone, internet, radio networks in the second half of the 20th century. The development of optical communication was caused primarily by the rapidly rising demand for Internet connectivity. Orthogonal frequency-division multiplexing (OFDM) belongs to a wide class of multicarrier modulation. Orthogonal frequency-division multiplexing has succeeded in a wide range of applications in the wireless communication domain from video/audio digital broadcasting to wireless local area networks (LANs). Although their very low loss compared to that of the wireless counterpart, optical systems still need renovation for spans commonly less than150 Km. In this paper advantages of optical orthogonal frequency division multiplexing in communications systems will explained.

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Umar, Amjad. "Computer Aided Planning for Wireless Systems". International Journal of Business Data Communications and Networking 8, n.º 1 (janeiro de 2012): 56–67. http://dx.doi.org/10.4018/jbdcn.2012010104.

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Information and communication technology (ICT) managers in the modern enterprises face a bewildering array of decisions regarding planning of new systems, integration of new systems with existing ones, securing the ICT assets, and administrating the resulting complex ICT systems. The rapid introduction of wireless systems (mobile computing and wireless communications) in the business and government settings is further exasperating the situation, particularly in the developing countries. A Computer Aided Planner (Planner), part of the UN eNabler Toolset, has been developed to quickly and effectively produce detailed strategic plans for a wide range of egovernment services with particular attention to wireless systems. This paper presents a high level overview of this effort.

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Zhao, Lili, Peng Zhang, Qicai Dong, Xiangyang Huang, Jianhua Zhao e Zeyu Su. "Research of the Channel Estimation in Wireless Communication Systems". ITM Web of Conferences 25 (2019): 01002. http://dx.doi.org/10.1051/itmconf/20192501002.

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Wireless communication technology has been developed rapidly after entering the 21st century. Data transfer rate increased significantly as well as the bandwidth became wider and wider from 2G to 4G in wireless communication systems. Channel estimation is an import part of any communication systems; its accuracy determines the quality of the whole communication. Channel estimation methods of typical wireless communication systems such as UWB, 2G and 3G have been researched.

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Huang, Yuanyuan, e Chengchu Wu. "Spectrum analysis of multi-pulse position modulation in optical communication". Highlights in Science, Engineering and Technology 53 (30 de junho de 2023): 78–87. http://dx.doi.org/10.54097/hset.v53i.9685.

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In this paper, the authors aim to compare the performance of space optical communication and wireless optical communication by analyzing the transmission mechanism, transmission method, and transmission rate of MPPM (Multi-Pulse Pulse Position Modulation). MPPM is a widely used modulation technique in optical communication systems, which has the advantage of reducing the effect of noise and improving the system's error rate. To achieve the objective, the authors will employ mathematical models to compare the performance of space optical communication and wireless optical communication. They will analyze the transmission mechanism, transmission method, and transmission rate of MPPM in both communication systems and draw conclusions based on their findings. The authors hope that the results of this study will positively promote the development of MPPM in the future. By comparing the performance of space optical communication and wireless optical communication, this study will provide insights into the strengths and weaknesses of both systems, which can help in the development of more efficient and reliable optical communication systems.

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Li, Miaoyu, Zhonghao Du, Yutong Liu e Siying Niu. "Optimization algorithm of communication systems with intelligent reflecting surface for internet of things". Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 39, n.º 2 (abril de 2021): 454–61. http://dx.doi.org/10.1051/jnwpu/20213920454.

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With the development of 5th-generation(5G) wireless systems and internet of things(IoT), high speed wireless communications are facing severe challenges due to numerous connections of communication terminals and limited frequency resources. Intelligent reflecting surface(IRS), a newly appeared wireless communication technology, has attracts people's attentions worldwide by its low power consumptions and costs. In order to improve the communication rates of users, this paper proposes a novel optimization algorithm by implementing the deep learning to IRS for establishing the mapping from the channel state information to the optimal reflecting coefficient matrix of IRS. The present algorithm can perform real-time reconfiguration of IRS while protecting the privacy of IoT users.

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SHUKLA, PRATIBHA, e Akhilesh A. Waoo. "Bitter Rate of Performance in Wireless Communications on 5G Technology". INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 07, n.º 12 (23 de dezembro de 2023): 1–13. http://dx.doi.org/10.55041/ijsrem27705.

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Wireless communications have become an integral part of our modern society, enabling seamless connectivity and data exchange. The bit rate of performance in wireless communication systems plays a crucial role in determining the quality of service and user experience. This abstract provides an overview of key factors influencing bit rate in wireless communications and highlights the challenges and advancements in optimizing performance. The bit rate, often measured in bits per second (bps) or multiples thereof, quantifies the rate at which data can be transmitted over a wireless channel. Several factors impact the bit rate in wireless communications, including the available bandwidth, modulation schemes, signal-to- noise ratio (SNR), and channel conditions. The bit rate is closely related to the achievable data throughput and is a critical metric for assessing the efficiency of wireless networks. Wireless technologies, such as 4G and 5G, have significantly increased the bit rates achievable for mobile communication. These technologies employ advanced modulation techniques and multiple-input, multiple- output (MIMO) systems to enhance spectral efficiency and data rates. Additionally, the deployment of small cells and the use of high-frequency bands have improved data rates and reduced latency in wireless networks. However, challenges persist in optimizing bit rates for wireless communications. Factors like signal interference, fading, and path loss can degrade performance. Moreover, the ever- increasing demand for data-intensive applications and the proliferation of IoT devices put additional pressure on wireless networks to deliver higher bit rates with low latency. To address these challenges, ongoing research focuses on developing advanced signal processing algorithms, beamforming techniques, and error correction mechanisms. Machine learning and artificial intelligence are also being employed to optimize wireless communication systems and enhance bit rates.

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Cano, Juan M., Aranzazu D. Martin, Reyes S. Herrera, Jesus R. Vazquez e Francisco Javier Ruiz-Rodriguez. "Grid-Connected PV Systems Controlled by Sliding via Wireless Communication". Energies 14, n.º 7 (31 de março de 2021): 1931. http://dx.doi.org/10.3390/en14071931.

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Grid-connected photovoltaic (PV) systems are designed to provide energy to the grid. This energy transfer must fulfil some requirements such as system stability, power quality and reliability. Thus, the aim of this work is to design and control a grid-connected PV system via wireless to guarantee the correct operation of the system. It is crucial to monitor and supervise the system to control and/or detect faults in real time and in a remote way. To do that, the DC/DC converter and the DC/AC converter of the grid-connected PV system are controlled wirelessly, reducing costs in cabling installations. The used control methods are the sliding for the DC/DC converter and the Proportional-Integral (PI) for the inverter. The sliding control is robust, ensures system stability under perturbations, and is proven to work well via wireless. The PI control is simple and effective, proving its validity through wireless too. In addition, the effect of the communications is analysed in both controllers. An experimental platform has been built to conduct the experiments to verify the operation of the grid-connected PV system remotely. The results show that the system operates well, achieving the desired values for the maximum power point tracker (MPPT) sliding control and the energy transfer from the inverter to the grid.

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Bhatt, Maharshi K., Bhavin S. Sedani e Komal Borisagar. "Performance analysis of massive multiple input multiple output for high speed railway". International Journal of Electrical and Computer Engineering (IJECE) 11, n.º 6 (1 de dezembro de 2021): 5180. http://dx.doi.org/10.11591/ijece.v11i6.pp5180-5188.

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This paper analytically reviews the performance of massive multiple input multiple output (MIMO) system for communication in highly mobility scenarios like high speed Railways. As popularity of high speed train increasing day by day, high data rate wireless communication system for high speed train is extremely required. 5G wireless communication systems must be designed to meet the requirement of high speed broadband services at speed of around 500 km/h, which is the expected speed achievable by HSR systems, at a data rate of 180 Mbps or higher. Significant challenges of high mobility communications are fast time-varying fading, channel estimation errors, doppler diversity, carrier frequency offset, inter carrier interference, high penetration loss and fast and frequent handovers. Therefore, crucial requirement to design high mobility communication channel models or systems prevails. Recently, massive MIMO techniques have been proposed to significantly improve the performance of wireless networks for upcoming 5G technology. Massive MIMO provide high throughput and high energy efficiency in wireless communication channel. In this paper, key findings, challenges and requirements to provide high speed wireless communication onboard the high speed train is pointed out after thorough literature review. In last, future research scope to bridge the research gap by designing efficient channel model by using massive MIMO and other optimization method is mentioned.

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Sabelkin, Mike, e François Gagnon. "Data Transmission Oriented on the Object, Communication Media, Application, and State of Communication Systems". International Journal of Interdisciplinary Telecommunications and Networking 3, n.º 2 (abril de 2011): 51–65. http://dx.doi.org/10.4018/jitn.2011040104.

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The proposed communication system architecture is called TOMAS, which stands for data Transmission oriented on the Object, communication Media, Application, and state of communication Systems. TOMAS could be considered a Cross-Layer Interface (CLI) proposal, since it refers to multiple layers of the Open Systems Interconnection Basic Reference Model (OSI). Given particular scenarios of image transmission over a wireless LOS channel, the wireless TOMAS system demonstrates superior performance compared to a JPEG2000+OFDM system in restored image quality parameters over a wide range of wireless channel parameters. A wireless TOMAS system provides progressive lossless image transmission under influence of moderate fading without any kind of channel coding and estimation. The TOMAS system employs a patent pending fast analysis/synthesis algorithm, which does not use any multiplications, and it uses three times less real additions than the one of JPEG2000+OFDM.

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CHEN, Chien-Sheng, Szu-Lin SU e Yih-Fang HUANG. "Mobile Location Estimation in Wireless Communication Systems". IEICE Transactions on Communications E94-B, n.º 3 (2011): 690–93. http://dx.doi.org/10.1587/transcom.e94.b.690.

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Lu, Dingqing, e Zhengrong Zhou. "Integrated solutions for testing wireless communication systems". IEEE Communications Magazine 49, n.º 6 (junho de 2011): 96–100. http://dx.doi.org/10.1109/mcom.2011.5783992.

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Wu, Yongpeng, Xiqi Gao, Shidong Zhou, Wei Yang, Yury Polyanskiy e Giuseppe Caire. "Massive Access for Future Wireless Communication Systems". IEEE Wireless Communications 27, n.º 4 (agosto de 2020): 148–56. http://dx.doi.org/10.1109/mwc.001.1900494.

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Ivrlac, M. T., W. Utschick e J. A. Nossek. "Fading correlations in wireless MIMO communication systems". IEEE Journal on Selected Areas in Communications 21, n.º 5 (junho de 2003): 819–28. http://dx.doi.org/10.1109/jsac.2003.810348.

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Birli, Joseph. "Wireless communication systems for masks or helmets". Journal of the Acoustical Society of America 122, n.º 5 (2007): 2505. http://dx.doi.org/10.1121/1.2801802.

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