Articles de revues : « WIRELES COMMUNICATION »

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Feng Wang, M. T. Thai, Yingshu Li, Xiuzhen Cheng et Ding-Zhu Du. « Fault-Tolerant Topology Control for All-to-One and One-to-All Communication in Wireles Networks ». IEEE Transactions on Mobile Computing 7, n^o 3 (mars 2008) : 322–31. http://dx.doi.org/10.1109/tmc.2007.70743.

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Handayani, Tri Febriana, Pande Ketut Sudiarta et I. Made Oka Widyantara. « UJI KEAMANAN KOMUNIKASI VOIP MENGGUNAKAN SISTEM KEAMANAN SRTP-TLS PADA JARINGAN NIRKABEL ». Jurnal SPEKTRUM 5, n^o 1 (25 juin 2018) : 13. http://dx.doi.org/10.24843/spektrum.2018.v05.i01.p02.

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VoIP is a technology used to communicate voice remotely and directly using data communication lines with TCP / IP protocol. But basically, VoIP communication does not guarantee data security when doing communication. A very important security system is added in VoIP communications to maintain the confidentiality of communication, so that communication can not be recorded and played back. To build a security when communicating VoIP, then in this study added an SRTP-TLS security system. The study was conducted on wireless networks by comparing the security of data communications when using the SRTP-TLS security system and without using a security system.Keywords: Wireless, Security System, VoIP

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Shrestha, Sujan, et Subarna Shakya. « Technical Analysis of ZigBee Wireless Communication ». December 2020 2, n^o 4 (5 janvier 2021) : 197–203. http://dx.doi.org/10.36548/jtcsst.2020.4.004.

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Information transformed over a long distance without any means like wires, cables and other forms of conductors. The term wireless communication is broad which incorporate different forms of communication and connecting between more devices without any mode of wires through this wireless communication technology. In pre-industrial age, the first network of wireless was developed. This technology has more advanced and featured with upcoming technology and this is one form is future generation. This technology has more impact in growing world. The name wireless communication itself gives the meaning without any physical connection the communication is done in better way. Wireless communication has exponential growth in cellular system and over around two to three billion users.

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Wen, Li Jia, et Xin Li. « The Research of CIR Based on Communication Technology of GSM-R ». Applied Mechanics and Materials 713-715 (janvier 2015) : 1269–72. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.1269.

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In order to realize the wireless communication function of railway locomotives, Cab Integrated Wireless communication equipment (referred to as CIR) as the railway wireless communication system in China's railway locomotives equipment, because has powerful functions, high degree of standardization, and flexible operating characteristics emerged. CRI is based on the GSM-R digital mobile communication technology, GPS global positioning technology, 450MHz and 800MHz analog wireless communications technology such as the development of comprehensive in-vehicle communications equipment. It is the ground of GSM-R equipment and 450MHz, 800MHz and other ground equipment, together form a complete rail integrated wireless communications network.

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Hadi, Teeb Hussein. « Types of Attacks in Wireless Communication Networks ». Webology 19, n^o 1 (20 janvier 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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Wang, Haichao, Jinlong Wang, Guoru Ding et Zhu Han. « D2D Communications Underlaying Wireless Powered Communication Networks ». IEEE Transactions on Vehicular Technology 67, n^o 8 (août 2018) : 7872–76. http://dx.doi.org/10.1109/tvt.2018.2832068.

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Ahmed, Iqrar, Heikki Karvonen, Timo Kumpuniemi et Marcos Katz. « Wireless Communications for the Hospital of the Future : Requirements, Challenges and Solutions ». International Journal of Wireless Information Networks 27, n^o 1 (28 octobre 2019) : 4–17. http://dx.doi.org/10.1007/s10776-019-00468-1.

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Abstract In this conceptual paper, we discuss the concept of hospital of the future (HoF) and the requirements for its wireless connectivity. The HoF will be mostly wireless, connecting patients, healthcare professionals, sensors, computers and medical devices. Spaces of the HoF are first characterized in terms of communicational performance requirements. In order to fulfil the stringent requirements of future healthcare scenarios, such as enhanced performance, security, safety, privacy, and spectrum usage, we propose a flexible hybrid optical-radio wireless network to provide efficient, high-performance wireless connectivity for the HoF. We introduce the concept of connected HoF exploiting reconfigurable hybrid optical-radio networks. Such a network can be dynamically reconfigured to transmit and receive optical, radio or both signals, depending on the requirements of the application. We envisage that HoF will consist of numerous communication devices and hybrid optical-radio access points to transmit data using radio waves and visible light. Light-based communications exploit the idea of visible light communications (VLC), where solid-state luminaries, white light-emitting diodes (LEDs) provide both room illumination as well as optical wireless communications (OWC). The hybrid radio-optical communication system can be used in principle in every scenario of the HoF. In addition to the hybrid access, we also propose a reconfigurable optical-radio communications wireless body area network (WBAN), extending the conventional WBAN to more generic and highly flexible solution. As the radio spectrum is becoming more and more congested, hybrid wireless network approach is an attractive solution to use the spectrum more efficiently. The concept of HoF aims at enhancing healthcare while using hospital resources efficiently. The enormous surge in novel communication technologies such as internet of things (IoT) sensors and wireless medical communications devices could be undermined by spectral congestion, security, safety and privacy issues of radio networks. The considered solution, combining optical and radio transmission network could increase spectral efficiency, enhancing privacy while reducing patient exposure to radio frequency (RF). Parallel radio-optical communications can enhance reliability and security. We also discuss possible operation scenarios and applications that can be introduced in HoF as well as outline potential challenges.

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Suhartono, Joni. « Merencanakan Keamanan Jaringan Komputer ». ComTech : Computer, Mathematics and Engineering Applications 2, n^o 1 (1 juin 2011) : 467. http://dx.doi.org/10.21512/comtech.v2i1.2784.

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Communication via wireless devices provides many benefits to companies and users, such as portability and flexibility, productivity improvement, and low installation fee. Wireless technology covers a variety of abilities on use and needs. A WLAN device as an example allows users to get mobile from a place to another without wires attached and connection loss. Wirelesss means more flexible, more efficient, and cost reduced. Adhoc network such as Bluetooth allows for data synchronization with network system and sharing application among devices. Bluetooth functions to diminish wires for printers and other supporting devices. Portable devices such as PDA and cell phone allow remote users to synchronize personal databases and provide accesses to email, browsing, and internet access. Thus, security risks are very influential on wireless network. Some of the risks are almost the same as the wired network, few are derived from other cable networks and some others are new.

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Rinne, Jukka, Jari Keskinen, Paul Berger, Donald Lupo et Mikko Valkama. « M2M Communication Assessment in Energy-Harvesting and Wake-Up Radio Assisted Scenarios Using Practical Components ». Sensors 18, n^o 11 (16 novembre 2018) : 3992. http://dx.doi.org/10.3390/s18113992.

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Techniques for wireless energy harvesting (WEH) are emerging as a fascinating set of solutions to extend the lifetime of energy-constrained wireless networks, and are commonly regarded as a key functional technique for almost perpetual communications. For example, with WEH technology, wireless devices are able to harvest energy from different light sources or Radio Frequency (RF) signals broadcast by ambient or dedicated wireless transmitters to support their operation and communications capabilities. WEH technology will have increasingly wider range of use in upcoming applications such as wireless sensor networks, Machine-to-Machine (M2M) communications, and the Internet of Things. In this paper, the usability and fundamental limits of joint RF and solar cell or photovoltaic harvesting based M2M communication systems are studied and presented. The derived theoretical bounds are in essence based on the Shannon capacity theorem, combined with selected propagation loss models, assumed additional link nonidealities, diversity processing, as well as the given energy harvesting and storage capabilities. Fundamental performance limits and available capacity of the communicating link are derived and analyzed, together with extensive numerical results evaluated in different practical scenarios, including realistic implementation losses and state-of-the-art printed supercapacitor performance figures with voltage doubler-based voltage regulator. In particular, low power sensor type communication applications using passive and semi-passive wake-up radio (WuR) are addressed in the study. The presented analysis principles and results establish clear feasibility regions and performance bounds for wireless energy harvesting based low rate M2M communications in the future IoT networks.

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Javornik, Tomaž, Andrej Hrovat et Aleš Švigelj. « Radio Technologies for Environment-Aware Wireless Communications ». WSEAS TRANSACTIONS ON COMMUNICATIONS 21 (31 décembre 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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Li, Fang Jian. « Analysis of the Wireless Optical Communication Technology and its Application ». Applied Mechanics and Materials 687-691 (novembre 2014) : 3579–82. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.3579.

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The wireless optical communication is a kind of broadband access technology, it can be said that it properly combined with the optical fiber and wireless communication technology. More to say, it is a powerful supplement of modern optical fiber communication. In this paper, based on the advantages of wireless optical communication technology, this paper introduces the wireless optical communication technology in the application of 2G network, 3G network and extends the application in backbone network, and analyzes the common problems and solutions in the wireless optical communication. With the advance of technology, the wireless optical communications technology development prospects will be more and more broad, is worthy of popularization and application.

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Kaushik, Himanshu. « Shifting Towards 6G from 5G Wireless Networks – Advancements, Opportunities and Challenges ». Journal of Electronics,Computer Networking and Applied Mathematics, n^o 26 (25 novembre 2022) : 20–29. http://dx.doi.org/10.55529/jecnam.26.20.29.

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Radio waves are used in wireless communication to transmit information from one location to another. Beginning in the twenty-first century, the advancement of electronic chips, antenna, and microcontrollers caused radio wave communication to proceed more quickly, which led to the widespread use of wireless voice communication. While 6G communications gained a lot of attention from the business and academic worlds, 5G communications are still being universally adopted. Compared through 5G, 6G will have a wider frequency band, greater transmission speed, spectrum efficiency, higher connection ability, lesser delay, broader exposure, and more strong anti-interference capacity to gratify a range of network necessities. This survey presents an perceptive understanding of 6G wireless communications via introducing necessities, features, serious technologies, challenges, opportunities and applications. 6G is estimated to do better than existing wireless communication systems concerning the transmission speed, latency, global coverage etc. Even though the 5G standard have obtained various advancements, there are still a few limits within it. 6G along will provide the necessities of a entirely related planet and offers ubiquitous wireless connectivity designed for everyone. The analysis of the existing condition of wireless communication in various states, together with the projection of future research potential, are both included in this study.

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Hughes Driscoll, Colleen A., Jamie A. Schub, Kristi Pollard et Dina El-Metwally. « A Wireless Text Messaging System Improves Communication for Neonatal Resuscitation ». American Journal of Medical Quality 32, n^o 3 (16 mai 2016) : 307–12. http://dx.doi.org/10.1177/1062860616650939.

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Handoffs for neonatal resuscitation involve communicating critical delivery information (CDI). The authors sought to achieve ≥95% communication of CDI during resuscitation team requests. CDI included name of caller, urgency of request, location of delivery, gestation of fetus, status of amniotic fluid, and indication for presence of the resuscitation team. Three interventions were implemented: verbal scripted handoff, Spök text messaging, and Engage text messaging. Percentages of CDI communications were analyzed using statistical process control. Following implementation of Engage, the communication of all CDI, except for indication, was ≥95%; communication of indication occurred 93% of the time. Control limits for most CDI were narrower with Engage, indicating greater reliability of communication compared to the verbal handoff and Spök. Delayed resuscitation team arrival, a countermeasure, was not higher with text messaging compared to verbal handoff ( P = 1.00). Text messaging improved communication during high-risk deliveries, and it may represent an effective tool for other delivery centers.

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Cao, Lei, et Xing Yang. « Research on the Convergence Application of Satellite Mobile Communication and Wireless Ad Hoc Network ». Journal of Physics : Conference Series 2187, n^o 1 (1 février 2022) : 012056. http://dx.doi.org/10.1088/1742-6596/2187/1/012056.

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Abstract The article analyzes the networking modes and main features of satellite mobile communications and wireless ad hoc networks, and proposes to build a dual-function terminal of satellite mobile communications and wireless ad hoc networks. By merging the respective advantages of the two communication modes, the application range of satellite mobile communication can be further expanded, and finally exemplified typical application scenarios.

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Li, Yun Feng, Yang Cao et Gang Dong. « Interoperability Analysis and Expectation of Short Distance Micro-Power Wireless Communication Technology ». Applied Mechanics and Materials 530-531 (février 2014) : 751–55. http://dx.doi.org/10.4028/www.scientific.net/amm.530-531.751.

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Electric energy consumption data acquisition system is an important part of the smart grid, with the construction and development of the State Grid Corporation electric energy consumption data acquisition, micro-power wireless communication is becoming one of the important local communication technologies for electric energy consumption data acquisition. However, many micro-power wireless provider different standards also brought many problems. This article describes the status of the domestic energy consumption data acquisition, the characteristics of micro-power wireless communications Interconnection and Interworking as well as prospects for the future research directions in the field of micro-power wireless communications.

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Leccese, Fabio, et Giuseppe Schirripa Spagnolo. « State-of-the art and perspectives of underwater optical wireless communications ». ACTA IMEKO 10, n^o 4 (30 décembre 2021) : 25. http://dx.doi.org/10.21014/acta_imeko.v10i4.1097.

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In scientific, military, and industrial sectors, the development of robust and efficient submarine wireless communication links is of enormous interest. Underwater wireless communications can be carried out through acoustic, radio frequency (RF), and optical waves. Underwater optical communication is not a new idea, but it has recently been considered because seawater exhibits a window of reduced absorption both in the visible spectrum and long-wavelength UV light (UV-A). Compared to its bandwidth limited acoustic counterpart, underwater optical wireless communications (UOWCs) can support higher data rates at low latency levels. Underwater wireless communication networks are important in ocean exploration, military tactical operations, environmental and water pollution monitoring. Anyway, given the rapid development of UOWC technology, documents are still needed showing the state of the art and the progress made by the most current research. This paper aims to examine current technologies, and those potentially available soon, for Underwater Optical Wireless Communication and to propose a new perspective using UV-A radiation.

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Gao, Feng, et Zhi Hua Hu. « The Security Mechanism for Wireless Sensor Networks ». Applied Mechanics and Materials 256-259 (décembre 2012) : 2392–95. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.2392.

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In recent years, with advances in microelectronics technology and wireless communication technology which promote the rapid development of low power, low price, multifunction sensor, and it also contributed to the development of wireless sensor networks. Wireless sensor network can be used in military, medical and commercial areas. This paper mainly described the characteristics of wireless sensor networks, security threats in the communication process and analyzed its security needs of taking security mechanisms to ensure the security of wireless communications.

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P., Renuka Devi. « Underwater Communication Using Wireless Sensor Networks ». International Journal of Psychosocial Rehabilitation 24, n^o 5 (20 avril 2020) : 2264–75. http://dx.doi.org/10.37200/ijpr/v24i5/pr201925.

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Agarwal, Abhishek. « Development of Architecture of Wireless Communication ». SIJ Transactions on Computer Networks & ; Communication Engineering 04, n^o 06 (15 décembre 2016) : 01–11. http://dx.doi.org/10.9756/sijcnce/v4i6/0206170201.

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Naranjo-Hernández, David, Amparo Callejón-Leblic, Željka Lučev Vasić, MirHojjat Seyedi et Yue-Ming Gao. « Past Results, Present Trends, and Future Challenges in Intrabody Communication ». Wireless Communications and Mobile Computing 2018 (11 mars 2018) : 1–39. http://dx.doi.org/10.1155/2018/9026847.

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Intrabody communication (IBC) is a wireless communication technology using the human body to develop body area networks (BANs) for remote and ubiquitous monitoring. IBC uses living tissues as a transmission medium, achieving power-saving and miniaturized transceivers, making communications more robust against external interference and attacks on the privacy of transmitted data. Due to these advantages, IBC has been included as a third physical layer in the IEEE 802.15.6 standard for wireless body area networks (WBANs) designated as Human Body Communication (HBC). Further research is needed to compare both methods depending on the characteristics of IBC application. Challenges remain for an optimal deployment of IBC technology, such as the effect of long-term use in the human body, communication optimization through more realistic models, the influence of both anthropometric characteristics and the subject’s movement on the transmission performance, standardization of communications, and development of small-size and energy-efficient prototypes with increased data rate. The purpose of this work is to provide an in-depth overview of recent advances and future challenges in human body/intrabody communication for wireless communications and mobile computing.

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Shang, Xiao Feng, Zhi Jian Wang et Chao Gang Fan. « Research on Radio Frequency Wireless Communication Technology ». Advanced Materials Research 314-316 (août 2011) : 337–40. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.337.

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On many occasions, the wired communications technologies can not meet the actual needs, such as in the operating in the wild or harsh environment. If using communication module built by radio frequency communication chip to achieve the data transmission of two regions of space, take MCU as a control component to achieve the freely data communication docking. This will be a good way to solve the wireless communications problems.

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

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Vaigandla, Karthik Kumar, Sravani Thatipamula et Radha Krishna Karne. « Investigation on Unmanned Aerial Vehicle (UAV) : An Overview ». IRO Journal on Sustainable Wireless Systems 4, n^o 3 (2 août 2022) : 130–48. http://dx.doi.org/10.36548/jsws.2022.3.001.

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Unmanned Aerial Vehicles (UAVs) are becoming increasingly popular these days. One among the major technological developments of today are UAVs or drones. The coordination and coverage capabilities of large clusters of UAVs, or their cooperative capabilities for such goals as terrain mapping, make them of particular interest. This paper explores the use of unmanned aerial vehicles in smart and modern cities in depth. Future wireless networks will likely include UAVs to facilitate wireless broadcasting and support high-speed transmissions. Various layer techniques are discussed in this paper. Moreover, an overview of the latest UAV communication technologies and network topologies has been presented. Military and commercial applications have attracted a lot of interest in unmanned aerial vehicles. Due to their low cost and flexible deployment, UAVs are considered valuable in 5G and 6G networks due to their communication capabilities. Like aerial base stations, relays, or mobile users in cellular networks, UAVs can provide airborne wireless coverage in a variety of ways. Wireless links can only be established temporarily with UAVs. A great challenge is to extend UAV communication's lifetime and develop low-power, green UAV communication. A comprehensive study of green UAV communications has been presented in this paper. Furthermore, an overview of UAV applications is also illustrated. Additionally, some promising research topics and methods are being discussed.

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Ding, Jupeng, Wenwen Liu, Chih-Lin I, Hui Zhang et Hongye Mei. « Advanced Progress of Optical Wireless Technologies for Power Industry : An Overview ». Applied Sciences 10, n^o 18 (16 septembre 2020) : 6463. http://dx.doi.org/10.3390/app10186463.

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Optical wireless communications have attracted widespread attention in the traditional power industry because of the advantages of large spectrum resources, strong confidentiality, and freedom from traditional electromagnetic interference. This paper mainly summarizes the major classification and frontier development of power industry optical wireless technologies, including the indoor and outdoor channel characteristics of power industry optical wireless communication system, modulation scheme, the performance of hybrid power line, and indoor wireless optical communications system. Furthermore, this article compares domestic and foreign experiments, analyzes parameters for instance transmission rate, and reviews different application scenarios such as power wireless optical positioning and monitoring. In addition, in view of the shortcomings of traditional power technology, optical wireless power transfer technology is proposed and combined with unmanned aerial vehicles to achieve remote communication. At last, the main challenges and possible solutions faced by power industry wireless optical technologies are proposed.

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Huang, Cao, Xiao Jun Guo et Ze Guo Liu. « An Integrated Wireless Communication System for Remote Pastoral Areas in Tibet ». Applied Mechanics and Materials 427-429 (septembre 2013) : 2313–16. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.2313.

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To support mobile communications in remote pastoral areas of Tibet effectively, this paper proposes an integrated wireless communication system including mobile ad hoc network (MANET), wireless senor network (WSN), cellular network and Beidou satellite network. The overall integrated wireless communication system and the relevant elements are described specifically. The proposed system can help to reduce the network deployment cost and provide voice, message and low rate data services.

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Zhao, Jian Jun, Yan Bai et Ren Shu Wang. « Application of Zigbee Technology in Chemical Water Ultrafiltration System ». Advanced Materials Research 459 (janvier 2012) : 343–46. http://dx.doi.org/10.4028/www.scientific.net/amr.459.343.

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Having investigated the application of industrial wireless gateway, this paper focuses on the designing of monitoring system in chemical water ultrafiltration system. This monitoring system is based on Zigbee wirelss communication technology and aims at the connecting between wireless sensor network and Profibus-Dp field bus. The design of operator station as well as hardware and software design for the valve terminal nodes and gateway are presented in detail.

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Qi, Chen Jie, et Hong Wei Wang. « The Wireless Sensor System Based on the Chip of STM32 and SH79F32 ». Applied Mechanics and Materials 548-549 (avril 2014) : 744–47. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.744.

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In this thesis, we take STM32F103R8T6 as main chip, SH79F32 as auxiliary chip, the temperature sensor of DS18B20 as collection tools, wireless transceiver based on nRF905 as communication tool, and reach the function of wireless sensor networks. Through Altium Designer Release 10 to conduct schematic design and draw PCB, and then solder circuit boards, use the software of Keil to design process, to realize wireless sensor communication between different microcontrollers, after that ,complete the design and production of wireless sensor communications platforms.

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Eswaran, Sivaraman. « Opportunities and Trends of Wireless Communications ». IRO Journal on Sustainable Wireless Systems 4, n^o 2 (25 juillet 2022) : 102–9. http://dx.doi.org/10.36548/jsws.2022.2.004.

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Wireless communication is a process of transferring information from one place to another place through radio waves. The transfer of information can be either an image or numerical data or voice or video. The design of wireless modules were started to come for a general user in the late 20th century but it has not been accepted in many applications due to its quality degrade over the wired systems. In the beginning of 21st century the improvisation of electronic chips, antenna and microcontroller made the radio wave communication to move forward in a faster way and that made the wireless voice communication as very popular. The paper analyzes the current status of wireless communication in different states and projects the research opportunities by exploring the future expectations of wireless communications.

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Tuzlukov, Vyacheslav. « Performance of Generalized Receiver Employed by Broadband Multicarrier DS-CDMA System Using Space-Time Spreading-Assisted Transmit Diversity ». WSEAS TRANSACTIONS ON COMMUNICATIONS 20 (29 septembre 2021) : 152–71. http://dx.doi.org/10.37394/23204.2021.20.21.

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In this paper the multicarrier direct-sequence code-division multiple access (MC DS-CDMA) using space-time spreading assisted transmit diversity is investigated in the context of broadband wireless communi-cations systems constructed based on the generalized approach to signal processing in noise over frequency-se-lective Rayleigh fading channels. We consider the issue of parameter design for the sake of achieving high-ef-ficiency communications in various dispersive environments. In contrast to the conventional MC DS-CDMA wireless communication system employing the time (T)-domain spreading only, in the present paper the broad-band wireless MC DS-CDMA wireless communication schemes employ both the time (T)-domain and frequen-cy (F)-domain spreading, i.e., employ the TF-domain spreading. The bit-error rate (BER) performance of the space-time spreading assisted broadband MC DS-CDMA wireless communications system is investigated for down-link transmissions associated with the single user and multiuser generalized detectors and is compared with that of the single user correlation detector and the multiuser decorrelating detector. Our study demonstra-tes that with appropriately selecting the system parameters, the broadband MC DS-CDMA wireless communi-cation system using the space-time spreading assisted transmit diversity constitutes a promising downlink tran-smission scheme. This scheme is capable to support ubiquitous communications over diverse communication environments without the BER performance degradation

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Jing Cheng Liang, Wen Hua Gao, Jun Yan Dai, Peng Zhang, Qiang Cheng et Tie Jun Cui. « A dual-band 3-bit reconfigurable intelligent surface with independent control of phases ». ITU Journal on Future and Evolving Technologies 4, n^o 1 (2 mars 2023) : 60–69. http://dx.doi.org/10.52953/tusq6486.

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Reconfigurable Intelligent Surfaces (RISs) have received a great deal of attention from the wireless communication community due to their powerful ability to improve the wireless communication environment. Dual-band RIS enables aperture to share two bands, improving spectrum utilization in wireless communications and thus expanding communication capacity. However, most of the reported dual-band RISs cannot achieve independent controls of the dual-band phases, which greatly limits their practical application in wireless communications. In this paper, we propose a dual-band 3-bit RIS to achieve independent controls of the reflection phases in two frequency bands by designing two tunable structures without raising the profile. It also exhibits low sensitivity to incident angles between 0° and 50°. Thereafter, the beam steering ability of the proposed RIS is further investigated with experiments under normal and oblique incidences at two frequencies, which demonstrates the powerful potential of RISs to manipulate the electromagnetic wave propagation environment.

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Yang, Qingyan, Virginia Sisiopiku, Jim A. Arnold, Paul Pisano et 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 (janvier 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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Leccese, Fabio, et Giuseppe Schirripa Spagnolo. « LED-to-LED wireless communication between divers ». ACTA IMEKO 10, n^o 4 (30 décembre 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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Kaur, Amandeep, et Praveen Kumar Malik. « Adoption of Micro-Strip Patch Antenna for Wireless Communication ». International Journal of Electronics, Communications, and Measurement Engineering 10, n^o 1 (janvier 2021) : 1–21. http://dx.doi.org/10.4018/ijecme.2021010101.

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The tremendous growth in wireless technology boosts the need for data transmission at high rates and with fast speed. The invention of wireless data transmission techniques cut down infrastructure costs by omitting the need for wires for long-distance communication. In every wireless application like wi-fi, Bluetooth, wi-max, GPS, mobile communication, satellite communication, etc. needs an antenna for signal transmission using radio wave, so the antenna is highly regarded for this. In this research article, an overview of wireless communication and the need for a microstrip patch antenna is discussed for wireless applications with gain and bandwidth enhancement techniques discovered by researchers till now after an extensive literature survey. Antenna performance is analyzed in terms of antenna parameters like VSWR, bandwidth, return loss, gain, and radiation pattern. This extensive literature survey is done to provide benefit to researchers and to analyze how much antenna efficiency is obtained at different frequencies in terms of the above-mentioned antenna parameters.

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Wen, Li Mei. « Application of Wireless Communication in Multi-Channel Temperature Control System ». Applied Mechanics and Materials 397-400 (septembre 2013) : 1918–22. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.1918.

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In the technology of temperature measurement, the sensor is an important part of system. But with the increase of the number of sensors, it will undoubtedly bring with a lot of data cable. Compared with wired communication technology, wireless communications technology has the advantages of low cost, simple structures, low impact of environment. So the wireless communication technology meeting with the requirements of data communications has become a more practical, fast and efficient way. This paper describes a multi-channel temperature monitoring system using nRF905 wireless transmission module, STC89C52RC MCU and DS18B20 temperature sensor as core. Functions such as sampling, analysis, display, alarm and others can be done automatically by the system, dates transmitted by wireless module, and the system can realize the function of real-time monitoring of temperature.

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Prabakaran, M. P., A. Sivasubramanian et K. Chitra. « Performance Analysis of QAM with MEMS Based SCIR for Indoor Optical Wireless Communication ». Applied Mechanics and Materials 592-594 (juillet 2014) : 2189–92. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.2189.

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This paper presents the systematic evaluation of performance of indoor optical wireless communication using different modulation schemes and micro electro mechanical systems - single channel imaging receiver (MEMS-SCIR). For the future modern world, indoor optical wireless communications (OWC) play a vital role. The main objective is to compare the performance of various modulation schemes in terms of their bit error probability. On -off keying (OOK) and pulse position modulation (PPM) are widely used in optical wireless communication for its simplicity. Here different digital modulation schemes are approached; bit error rate (BER) is calculated over additive white Gaussian noise channel (AWGN). M-quadrature amplitude modulation (MQAM) gives a better BER performance compared to the M- phase shift keying (MPSK). Thus, MQAM based MEMS-SCIR provides better performance in indoor optical wireless communications.

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Sopan Talekar. « Applications of Cognitive Radio Networks : A Review ». December 2022 4, n^o 4 (4 janvier 2023) : 272–83. http://dx.doi.org/10.36548/jismac.2022.4.004.

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Cognitive radio network is one of the future technology of wireless communication. Recently, wireless communications are facing the problem of spectrum scarcity due to the huge demand for various applications. There are many applications such as health services, personal entertainment, military and public safety, smart home appliances, smart farming, traffic monitoring, controlling etc., using wireless communication, and most of them are delay sensitive and real time applications. The wireless communication can improve their performance with the capabilities of cognitive radio. In this study, many cognitive radio enabled wireless applications are discussed. It shows that it can be easily deployed with cognitive radio enabled devices without any cost. With this, unused licensed spectrum is utilized efficiently and moreover, it solves the problem of spectrum scarcity.

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Widom, Allan, Yogendra N. Srivastava et John Swain. « Wireless Electromagnetic Communication Systems between Bacteria in Communities ». Key Engineering Materials 543 (mars 2013) : 318–21. http://dx.doi.org/10.4028/www.scientific.net/kem.543.318.

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Bacteria, very old on an evolutionary scale, can live within agricultural soils wiredtogether into communities. The information content transferred through the wires is not yetentirely clear. It has recently been discovered that, younger on the evolutionary scale, E. colibacteria can live in communities with wireless communication systems. E. coli bacteria containDNA macromolecules in the form of a closed loops. The DNA molecules are coated with coherentwater shells having semiconducting properties. The electron energy levels when moving withinthe DNA water shells can be invoked to explain the broadcast and reception frequency spectraof the wireless bacterial systems.

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Aggarwal, Rishabh. « Wireless Communication : Evolution and Advance Wireless Communication ». International Journal of Sustainable Development Research 4, n^o 2 (2018) : 25. http://dx.doi.org/10.11648/j.ijsdr.20180402.12.

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Liang, Chuan, Guang Hui Cai, Peng Li et Shu Wen Zheng. « Design and Implementation of an OFDM System with Interleaving and De-Interleaving Based on FPGA ». Advanced Materials Research 1008-1009 (août 2014) : 1497–500. http://dx.doi.org/10.4028/www.scientific.net/amr.1008-1009.1497.

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Today's wireless communication has become the primary means of communication, the wireless communication relative to wired communications, its random parameter channel delay problem and fading problem raising a new challenge to the reliability of communication. This article describes the basic principle of OFDM system with interleaving and de-interleaving, Verification platform to build on this basis, and using EDA tools Quartus II functional and timing verify the correctness, Giving the integrated circuit simulation results, also showing the use of FPGA to achieve interleave and interleaving process well in OFDM systems. Effectively improve the reliability of the system, not only meet the needs of Systems on flexibility and real-time, but also occupy less hardware resources, fast, and consistent with the development trend of modern communications.

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N. Krishnaraj. « An overview of NFC Technology for Wireless Communication ». December 2022 4, n^o 4 (4 janvier 2023) : 263–76. http://dx.doi.org/10.36548/jsws.2022.4.005.

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This article discusses about wireless communication technologies such as IEEE 802.15.4, Wireless Sensor Network (WSN), Ultra-High Frequency (UHF) and Near Field Communication (NFC) technologies are described. The part of industry and everyday life could be significantly impacted by Wireless Sensor Networks (WSN). A wireless sensor network (WSN) is a collection of sensor nodes that communicate with one another using wireless technologies. These nodes gather data and send it to the gateway across the Internet, the informal cloud. In a WSN, node-to-node communication may be multi-hop or direct. Every new concept or technology attempts to be integrated into the WSN in order to increase efficiency, improve user experience, and consume less power. Near Field Communications (NFC), a type of wireless networking technology allows to establish simple, secure and interactive communication. iPack is a technology that focuses on integrating NFC into pre-existing systems to create a Wireless Sensor Network (WSN) that supports NFC. Furthermore, data from a sensor node can be transferred to devices with a single touch by using this method. NFC with WSN is a single hop communication. The NFC interface also offers a safe wireless connection.

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Valarmathi, P. « Li-Fi Technology in Wireless Data Communication ». International Journal of Trend in Scientific Research and Development Volume-2, Issue-5 (31 août 2018) : 2338–45. http://dx.doi.org/10.31142/ijtsrd18299.

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Poor, H. Vincent. « 2022 ACM SIGMOBILE Outstanding Contributions Award ». GetMobile : Mobile Computing and Communications 26, n^o 2 (21 juillet 2022) : 19. http://dx.doi.org/10.1145/3551670.3551676.

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For significant and lasting contributions to research on mobile computing and communications and wireless networking, Dr. Andrea Goldsmith is the recipient of the 2022 SIGMOBILE Outstanding Contributions Award. Dr. Goldsmith is a world-class scholar and entrepreneur in the field of wireless communications. Her work, beginning in the 1990s, on the capacity of fading communication channels, and on the use of adaptive modulation schemes to achieve this capacity, has had considerable influence on the thinking of the wireless networking community as the need for highercapacity wireless systems has exploded over the intervening years.

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Kang, Yoohwa, Sunwoo Lee, Songi Gwak, Taekyeong Kim et Donghyeok An. « Time-Sensitive Networking Technologies for Industrial Automation in Wireless Communication Systems ». Energies 14, n^o 15 (26 juillet 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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Et. al., Dr B. Suneela,. « MOLECULAR ABSORPTION IN ATOMSPHERE USING MILLIMETER WAVE COMMUNICATION ». INFORMATION TECHNOLOGY IN INDUSTRY 9, n^o 2 (1 avril 2021) : 722–30. http://dx.doi.org/10.17762/itii.v9i2.405.

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Millimeter wave (mmWave) communication has become the boom for manyacademic institutions and industry organisations reason for its benefits when related to the prevailing wireless communication procedures comprising of Wifi, 4G, 5G,mmWavepcommunications such as WiFi and 4G, mmWave communications implement frequency carriers at higher level including such features enormous range of bandwidth, quality, narrow beam, extreme transmissionsuperiority, and robust detection capability. Such critical situations affected by the most preferrable applications will be well tackled with the problems face by employing wireless technologies. The increase rapidly traffic can substantially lighten the wireless communication due to enhancement in the technology ofmmWave communications. Over the insight of mmWave advantageous with respect to the easy obstruction, clear handling, less wavelength, and blockings etc., to do with the major issues and concerns that utilize for the additionalamenities with enormous quantity of 5G communications with the traditional way ofstatementfor anti-impeding, dynamic control, interference supervision, spatial reuse, and system design for enhancement. This study surveys the various standards and concerns related to structural design and protocols for mmWave communicationsassessedon cellular based access and its beneficial areas has been investigated.

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Wadly, Fachrid, Rio Septian et Zuhri Ramadhan. « Strategi Penanggulangan Kelemahan Terhadap Ancaman Keamanan Pada Jaringan Wireless ». Jurnal Nasional Teknologi Komputer 3, n^o 2 (30 avril 2023) : 59–67. http://dx.doi.org/10.61306/jnastek.v3i2.89.

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The use of wireless-based technology devices at this time is so much, good used for voice and data communications. Because wireless technology utilizes frequency high to deliver a communication, then the vulnerability to security is also higher compared to other communication technologies. Various security measures can be taken through communication devices used by users and by operators who provide services communication. Weaknesses of wireless networks in general can be divided into 2 types, namely weaknesses on the configuration and weakness on the type of encryption used. Broadly speaking, the gap on wireless network spans over four layers where the four layers actually are is the process of occurrence of data communication on wireless media. The four layers are layers physical layer, network layer, user layer, and application layer. The security handling models that occur in each layer of wireless technology can be done, among others, by: hide SSID, make use of WEP keys, WPA-PSK or WPA2-PSK, facility implementation, MAC filtering, installation of captive portal infrastructure.

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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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Briso-Rodríguez, César, Ke Guan, Yin Xuefeng et 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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Beck, Edgar, Carsten Bockelmann et Armin Dekorsy. « Semantic Information Recovery in Wireless Networks ». Sensors 23, n^o 14 (12 juillet 2023) : 6347. http://dx.doi.org/10.3390/s23146347.

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Motivated by the recent success of Machine Learning (ML) tools in wireless communications, the idea of semantic communication by Weaver from 1949 has gained attention. It breaks with Shannon’s classic design paradigm by aiming to transmit the meaning of a message, i.e., semantics, rather than its exact version and, thus, enables savings in information rate. In this work, we extend the fundamental approach from Basu et al. for modeling semantics to the complete communications Markov chain. Thus, we model semantics by means of hidden random variables and define the semantic communication task as the data-reduced and reliable transmission of messages over a communication channel such that semantics is best preserved. We consider this task as an end-to-end Information Bottleneck problem, enabling compression while preserving relevant information. As a solution approach, we propose the ML-based semantic communication system SINFONY and use it for a distributed multipoint scenario; SINFONY communicates the meaning behind multiple messages that are observed at different senders to a single receiver for semantic recovery. We analyze SINFONY by processing images as message examples. Numerical results reveal a tremendous rate-normalized SNR shift up to 20 dB compared to classically designed communication systems.

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Sun, Shu Min, Wen Juan Jiang, Yu Meng et Yan Cheng. « The Hardware Design of Measurement System of Transmission Lines Based on Wireless Communication ». Advanced Materials Research 1092-1093 (mars 2015) : 366–69. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.366.

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A set of measurement system for the testing of transmission lines, composing of wireless center station, wireless current acquisition and transmission nodes, wireless voltage acquisition and transmission node, was designed, which was based on wireless communication. The high speed wireless bridge working at 2.4GHz together with the clock synchronization module based on the IEEE1588 communicating protocol were both employed for the communication and time synchronization separately. The measurement system has data storage, waveform display, data analysis, automatic report generation and other functions. The measurement system can greatly reduced arrangement of cables, thereafter improved the test efficiency.

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DeGaspari, John. « Feature Focus : Fieldbus Architecture : A Tale of Two Buses ». Mechanical Engineering 123, n^o 09 (1 septembre 2001) : 51–55. http://dx.doi.org/10.1115/1.2001-sep-2.

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This article focuses on field bus technology, a digital two-way conul1unications protocol. It is designed to take advantage of intelligent instrumentation equipped with microprocessors to communicate between the field and the control room. Because it can communicate large quantities of data from the field devices, industrial networks tying together field bus instruments open the way for complex control and automation tasks. As field bus evolves, some think that computer networking will play an increasingly important role and improve the performance in the plant. Both Profibus and Fieldbus Foundation provide for Ethernet capability. Wireless communication is also likely to play a potential role in field bus systems. There is a potential for wireless in data acquisition. Issues still needed to be worked out: electrical storms can interfere with communications and wires must be strung to power the devices.

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