Articles de revues : « Wireless communication systems »

1

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

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

2

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

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

3

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

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

4

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

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

5

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.

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

6

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.

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

7

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 novembre 2018) : 4075. http://dx.doi.org/10.3390/s18114075.

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

8

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.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

9

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.

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

10

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

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

11

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

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

12

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

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

13

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

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

14

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

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

15

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

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

16

Trivedi, Kishor S., Xiaomin Ma et 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.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

17

Daneshgaran, Fred, et 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.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

18

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.

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

19

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

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

20

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

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

21

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.

Texte intégral

Résumé :

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).

Styles APA, Harvard, Vancouver, ISO, etc.

22

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.

Texte intégral

Résumé :

<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>

Styles APA, Harvard, Vancouver, ISO, etc.

23

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

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

24

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.

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

25

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

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

26

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

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

27

Li, Yuhua, Lishuang Wan et Haimin Zhang. « Communication Network for Sports Activity Monitoring Systems ». Complexity 2021 (17 avril 2021) : 1–10. http://dx.doi.org/10.1155/2021/9971605.

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

28

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

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

29

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

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

30

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

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

31

Zhao, Lili, Peng Zhang, Qicai Dong, Xiangyang Huang, Jianhua Zhao et 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.

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

32

Li, Miaoyu, Zhonghao Du, Yutong Liu et 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 (avril 2021) : 454–61. http://dx.doi.org/10.1051/jnwpu/20213920454.

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

33

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

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

34

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

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

35

CHEN, Chien-Sheng, Szu-Lin SU et 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.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

36

Lu, Dingqing, et Zhengrong Zhou. « Integrated solutions for testing wireless communication systems ». IEEE Communications Magazine 49, n^o 6 (juin 2011) : 96–100. http://dx.doi.org/10.1109/mcom.2011.5783992.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

37

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

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

38

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

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

39

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.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

40

Iskander, M. F., et Zhengqing Yun. « Propagation prediction models for wireless communication systems ». IEEE Transactions on Microwave Theory and Techniques 50, n^o 3 (mars 2002) : 662–73. http://dx.doi.org/10.1109/22.989951.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

41

Arnon, S. « Optimization of urban optical wireless communication systems ». IEEE Transactions on Wireless Communications 24, n^o 5 (mai 2003) : 626–29. http://dx.doi.org/10.1109/twc.2003.814351.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

42

Wang, Ke. « Quasi-Passive Indoor Optical Wireless Communication Systems ». IEEE Photonics Technology Letters 32, n^o 21 (1 novembre 2020) : 1373–76. http://dx.doi.org/10.1109/lpt.2020.3026343.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

43

Del Re, E., S. Morosi, D. Marabissi, L. Mucchi, L. Pierucci et L. S. Ronga. « Reconfigurable Antenna for Future Wireless Communication Systems ». Wireless Personal Communications 42, n^o 3 (23 janvier 2007) : 405–30. http://dx.doi.org/10.1007/s11277-006-9185-8.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

44

Ghassemlooy, Z., et A. C. Boucouvalas. « Indoor optical wireless communication systems and networks ». International Journal of Communication Systems 18, n^o 3 (2005) : 191–93. http://dx.doi.org/10.1002/dac.698.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

45

Arslan, H�seyin, et Gregory E. Bottomley. « Channel estimation in narrowband wireless communication systems ». Wireless Communications and Mobile Computing 1, n^o 2 (2001) : 201–19. http://dx.doi.org/10.1002/wcm.14.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

46

Lee, Byung Moo, et Rui J. P. de Figueiredo. « BLAST PERFORMANCE IN MIMO WIRELESS COMMUNICATION SYSTEMS ». SYNCHROINFO JOURNAL 8, n^o 1 (2022) : 25–29. http://dx.doi.org/10.36724/2664-066x-2022-8-1-25-29.

Texte intégral

Résumé :

Recently, a new detection algorithm for the Vertical Bell Laboratories Layered Space Time (V-BLAST) system, which we call Enhanced-V-BLAST, or simply E-V-BLAST, was proposed. V-BLAST has demonstrated very high spectral efficiency, there is a wide gap between the original V-BLAST algorithm and the Maximum Likelihood (ML) algorithm. Recently, some algorithms have been presented to make narrower this gap. In a new detection algorithm (Enhanced (E) V BLAST) for V-BLAST system was presented which showed significantly better performance and flexibility than the original V-BLAST detection. The E-V-BLAST algorithm gets closer to the optimum detection Maximum Likelihood (ML) algorithm by making decisions based on multiple symbols. The Enhanced (E)-V-BLAST has two parameters which can be adjusted to achieve a desired performance and complexity trade-off. In the present paper, we analyze the performance of EV-BLAST as a function of the two inherent adjustable parameters of E-V-BLAST. On the basis of this analysis, we obtain some useful characteristics of the E-V-BLAST algorithm which allow one to achieve the desired performance and complexity trade-off.

Styles APA, Harvard, Vancouver, ISO, etc.

47

Bechteler, A. Sevinc Aydinlik, et Thomas F. Bechteler. « Switchless bidirectional amplifier for wireless communication systems ». Microwave and Optical Technology Letters 49, n^o 8 (2007) : 1888–90. http://dx.doi.org/10.1002/mop.22631.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

48

DURRESI, Mimoza. « Ad-hoc wireless sensor communications for health monitoring systems ». Ingenious 2, n^o 1 (2022) : 7–14. http://dx.doi.org/10.58944/rycc2468.

Texte intégral

Résumé :

The Covid 19 challenge, the increased aging population, and the modern way of living are increasing the need for health monitoring communications services. Healthcare monitoring is a very important research field of study. This is related in finding new, more efficient ways in health data communications with three main quality of service requirements: low delay, high security, high quality data transmission. Considering these requirements and recent developments in domestical health monitoring services, it is important not only the equipment used for health monitoring sensing but also the communication protocol used to access the data center. In this paper we develop a new communication protocol for ad-hoc wireless network created by the sensors used for personal health monitoring systems installed in patient wrists. This is a hierarchical protocol where the sensors communicate through a virtual infrastructure that helps to collect the data from the personal health monitoring equipments in an efficient way even in the areas with no wireless infrastructure. The communication scheme ensures a hierarchy of nodes that gets translated to hierarchy of costs as only a few nodes need to have a larger processing power resulting in a lower battery consumption for most of the patients. The neighbourhood area is divided into virtual cells where each cell is represented from one node center that holds the communication for all the surrounded nodes and forwards its information towards the next cell center found in the direction of the sink. As a result the information collected even in the fields without any wireless infrastructure might be carried towards the cells that are in a communication distance with the sink. The updated information data is forwarded toward the data centers to be analysed by the specialists. Taking in consideration that even in the urban areas the elderly population doesn’t have internet services, this ad-hoc communication protocol represents a good solution for health monitoring equipments. Moreover, the same communication protocol can be used for signaling life signs in war areas.

Styles APA, Harvard, Vancouver, ISO, etc.

49

Sabelkin, Mike, et 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 (avril 2011) : 51–65. http://dx.doi.org/10.4018/jitn.2011040104.

Texte intégral

Résumé :

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.

Styles APA, Harvard, Vancouver, ISO, etc.

50

Naresh Kumar, D., et . « Securing Underwater Wireless Communication Networks ». International Journal of Engineering & ; Technology 7, n^o 2.23 (20 avril 2018) : 505. http://dx.doi.org/10.14419/ijet.v7i2.23.15344.

Texte intégral

Résumé :

Underwater remote correspondence systems (UWCNs) are especially defenseless against vindictive assaults because of the high piece blunder rates, huge and variable proliferation deferrals, and low data transmission of acoustic channels. The special attributes of the Underwater acoustic correspondence channel and the contrasts between Underwater sensor systems and their ground-based partners require the improvement of productive and solid security instruments. In this class, an entire review of security for UWCNs is exhibited, and the exploration challenge for secure correspondence in this condition is sketched out.UWCNs incorporate sensors and self-ruling Underwater vehicles (AUVs) that collaborate to perform particular applications, for example, Underwater observing. Coordination and data sharing amongst sensors and AUVs make the arrangement of security testing.

Styles APA, Harvard, Vancouver, ISO, etc.

Articles de revues sur le sujet « Wireless communication systems »

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres