Bibliografie tematiche / Wireless communication systems. Data transmission systems. Radio

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Letteratura scientifica selezionata sul tema "Wireless communication systems. Data transmission systems. Radio"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 6 febbraio 2022

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Articoli di riviste sul tema "Wireless communication systems. Data transmission systems. Radio"

Fedosov, Valentin, Andrey Legin e Anna Lomakina. "Adaptive algorithm based on antenna arrays for radio communication systems". Serbian Journal of Electrical Engineering 14, n. 3 (2017): 301–12. http://dx.doi.org/10.2298/sjee1703301f.

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Trends in the modern world increasingly lead to the growing popularity of wireless technologies. This is possible due to the rapid development of mobile communications, the Internet gaining high popularity, using wireless networks at enterprises, offices, buildings, etc. It requires advanced network technologies with high throughput capacity to meet the needs of users. To date, a popular destination is the development of spatial signal processing techniques allowing to increase spatial bandwidth of communication channels. The most popular method is spatial coding MIMO to increase data transmission speed which is carried out due to several spatial streams emitted by several antennas. Another advantage of this technology is the bandwidth increase to be achieved without expanding the specified frequency range. Spatial coding methods are even more attractive due to a limited frequency resource. Currently, there is an increasing use of wireless communications (for example, WiFi and WiMAX) in information transmission networks. One of the main problems of evolving wireless systems is the need to increase bandwidth and improve the quality of service (reducing the error probability). Bandwidth can be increased by expanding the bandwidth or increasing the radiated power. Nevertheless, the application of these methods has some drawbacks, due to the requirements of biological protection and electromagnetic compatibility, the increase of power and the expansion of the frequency band is limited. This problem is especially relevant in mobile (cellular) communication systems and wireless networks operating in difficult signal propagation conditions. One of the most effective ways to solve this problem is to use adaptive antenna arrays with weakly correlated antenna elements. Communication systems using such antennas are called MIMO systems (Multiple Input Multiple Output multiple input - multiple outputs). At the moment, existing MIMO-idea implementations do not always noticeably accelerate traffic at short distances from the access point, but, they are very effective at long distances. The MIMO principle allows reducing the number of errors in radio data interchange (BER) without reducing the transmission rate under conditions of multiple signal re-reflections. The work aims at developing an adaptive space-time signal algorithm for a wireless data transmission system designed to improve the efficiency of this system, as well as to study the efficiency of the algorithm to minimizing the error bit probability and maximizing the channel capacity.

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Olberg, P. "Multimedia Sensor Networks Based on Ultra-wideband Chaotic Radio Pulses". Bulletin of Science and Practice 7, n. 2 (15 febbraio 2021): 220–26. http://dx.doi.org/10.33619/2414-2948/63/21.

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The fast direction in information and communication systems of the wireless sensor network is discussed. Special attention was paid to ultra-wideband wireless sensor networks, which use chaotic radio pulses as information carriers for communication between sensor nodes. The creation of such systems became possible after many years of research on the creation and management of chaos in electronic systems. The requirements for transceivers for transmitting multimedia data in wireless sensor networks and the characteristics of existing systems are considered. The prospects of using ultra-wideband wireless systems based on direct chaotic data transmission in multimedia sensor networks are analyzed.

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Kumar, A. Narendra. "Low Error Rate Data Transmission in Cognitive Radio Networks". JOURNAL OF ADVANCES IN CHEMISTRY 13, n. 10 (4 marzo 2017): 5899–904. http://dx.doi.org/10.24297/jac.v13i10.5832.

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Cognitive Radio (CR) has become a hopeful technology to enhance the spectrum utilization through spectrum sharing between licensed user (primary user) and unlicensed user (secondary user). An vital rule mandated for the development of such frameworks are to develop solutions that donâ€™t require any changes to the existing primary user (PU) infrastructure. An Orthogonal Frequency Division Multiplexing (OFDM) is typically worn advancements in present wireless communication systems which has the possibility of fulfilling the demand for cognitive radios intrinsically or with slight changes. In this paper, Space time block codes is used. The various antennas used on both ends for trustworthy data broadcast and interference nulling schemes. These codes can accomplish full broadcast diversification determined via the number of broadcast antennas. The MIMO is worn for enhancing the power of a wireless link, to determine the issue for lower BER and achieve a superior performance.

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Riurean, Simona. "Design and Evaluation of Visible Light Wireless Data Communication Models". Journal of Digital Science 2, n. 2 (29 dicembre 2020): 3–13. http://dx.doi.org/10.33847/2686-8296.2.2_1.

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The technologies based on the radio frequency used for wireless transmission indoor are more congested than ever these days, therefore several wireless communication alternatives are intensively searched. Some most promising technologies are based on the optical part of the electromagnetic spectrum. The benefits and drawbacks in optical wireless data communication models design are presented in this work. The key characteristics of the VLC systems are briefly discussed, as well. Some models developed for wireless data transfer in visible light communication and infrared are presented, and their operation related to the data rate and the length of the optical link, are briefly compared.

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Huening, Felix, Holger Heuermann, Franz-Josef Wache e Rami Audisho Jajo. "A new wireless sensor interface using dual-mode radio". Journal of Sensors and Sensor Systems 7, n. 2 (21 settembre 2018): 507–15. http://dx.doi.org/10.5194/jsss-7-507-2018.

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Abstract. The integration of sensors is one of the major tasks in embedded, control and “internet of things” (IoT) applications. For the integration mainly digital interfaces are used, starting from rather simple pulse-width modulation (PWM) interface to more complex interfaces like CAN (Controller Area Network). Even though these interfaces are tethered by definition, a wireless realization is highly welcome in many applications to reduce cable and connector cost, increase the flexibility and realize new emerging applications like wireless control systems. Currently used wireless solutions like Bluetooth, WirelessHART or IO-Link Wireless use dedicated communication standards and corresponding higher protocol layers to realize the wireless communication. Due to the complexity of the communication and the protocol handling, additional latency and jitter are introduced to the data communication that can meet the requirements for many applications. Even though tunnelling of other bus data like CAN data is generally also possible the latency and jitter prevent the tunnelling from being transparent for the bus system. Therefore a new basic technology based on dual-mode radio is used to realize a wireless communication on the physical layer only, enabling a reliable and real-time data transfer. As this system operates on the physical layer it is independent of any higher layers of the OSI (open systems interconnection) model. Hence it can be used for several different communication systems to replace the tethered physical layer. A prototype is developed and tested for real-time wireless PWM, SENT (single-edge nibble transmission) and CAN data transfer with very low latency and jitter.

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Brennan, Daniel, Bing Miao, Konstantin Vassilevski, Nicolas G. Wright e Alton B. Horsfall. "Amplitude Shift Keyed Radio Communications for Hostile Environments". Materials Science Forum 645-648 (aprile 2010): 953–56. http://dx.doi.org/10.4028/www.scientific.net/msf.645-648.953.

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This work presents the amplitude modulation radio transmission system for communications in hostile environments. The commissioning of a high temperature oscillator and AM mixer system for the purpose of Amplitude Shift Keyed modulation is presented. While previous work has demonstrated oscillators in the Ultra High Frequency (UHF) band, these have been targeted at applications such as radar and mobile telephones. In this paper we have concentrated on the shortwave bands to maximize the range between a sensor unit and the receiver within wireless networks. The work demonstrates that simple communication systems are already possible for hostile environments and allow for simple sensor data to be wirelessly transmitted to safer working areas.

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Zhang, Zhenyu, Anas Chaaban e Lutz Lampe. "Physical layer security in light-fidelity systems". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, n. 2169 (2 marzo 2020): 20190193. http://dx.doi.org/10.1098/rsta.2019.0193.

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Light-fidelity (LiFi) is a light-based wireless communication technology which can complement radio-frequency (RF) communication technologies for indoor applications. Although LiFi signals are spatially more contained than RF signals, the broadcasting nature of LiFi also makes it susceptible to eavesdropping. Therefore, it is important to secure the transmitted data against potential eavesdroppers. In this paper, an overview of the recent developments pertaining to LiFi physical layer security (PLS) is provided, and the main differences between LiFi PLS and RF PLS are explained. LiFi achievable secrecy rates and upper bounds are then investigated under practical channel models and transmission schemes. Beamforming and jamming, which received significant research attention recently as a means to achieve PLS in LiFi, are also investigated under indoor illumination constraints. Finally, future research directions of interest in LiFi PLS are identified and discussed. This article is part of the theme issue ‘Optical wireless communication’.

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Heslop, Liza, Andrew Howard, Juanita Fernando, Andrew Rothfield e Lyn Wallace. "Wireless communications in acute health-care". Journal of Telemedicine and Telecare 9, n. 4 (1 agosto 2003): 187–93. http://dx.doi.org/10.1258/135763303322225490.

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Before a particular form of wireless communication is implemented within a health-care institution, consideration should be given to the system's capacity for transmitting voice, data and video information, as well as its reliability and coverage. An important associated choice concerns the best combination of user devices that will enable secure and rapid transmission of data to clinical staff at the point of care. Several technologies are available. No new technology that is likely to become available over the next five years will address the two main concerns of health service organizations: the need for non-interference with sensitive equipment; and the need for immediate communication of urgent messages. We therefore believe that health industries with a mobile workforce will gain five to eight years of useful life from cordless telephone systems and that paging or other radio-based devices will remain an important mode of communication for at least the next five years, especially where emergency communication is concerned.

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Garlinska, Magdalena, Agnieszka Pregowska, Karol Masztalerz e Magdalena Osial. "From Mirrors to Free-Space Optical Communication—Historical Aspects in Data Transmission". Future Internet 12, n. 11 (22 ottobre 2020): 179. http://dx.doi.org/10.3390/fi12110179.

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Fast communication is of high importance. Recently, increased data demand and crowded radio frequency spectrum have become crucial issues. Free-Space Optical Communication (FSOC) has diametrically changed the way people exchange information. As an alternative to wire communication systems, it allows efficient voice, video, and data transmission using a medium like air. Due to its large bandwidth, FSOC can be used in various applications and has therefore become an important part of our everyday life. The main advantages of FSOC are a high speed, cost savings, compact structures, low power, energy efficiency, a maximal transfer capacity, and applicability. The rapid development of the high-speed connection technology allows one to reduce the repair downtime and gives the ability to quickly establish a backup network in an emergency. Unfortunately, FSOC is susceptible to disruption due to atmospheric conditions or direct sunlight. Here, we briefly discuss Free-Space Optical Communication from mirrors and optical telegraphs to modern wireless systems and outline the future development directions of optical communication.

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Brandl, Martin, e Karlheinz Kellner. "Performance Evaluation of Power-Line Communication Systems for LIN-Bus Based Data Transmission". Electronics 10, n. 1 (4 gennaio 2021): 85. http://dx.doi.org/10.3390/electronics10010085.

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Powerline communication (PLC) is a versatile method that uses existing infrastructure such as power cables for data transmission. This makes PLC an alternative and cost-effective technology for the transmission of sensor and actuator data by making dual use of the power line and avoiding the need for other communication solutions; such as wireless radio frequency communication. A PLC modem using DSSS (direct sequence spread spectrum) for reliable LIN-bus based data transmission has been developed for automotive applications. Due to the almost complete system implementation in a low power microcontroller; the component cost could be radically reduced which is a necessary requirement for automotive applications. For performance evaluation the DSSS modem was compared to two commercial PLC systems. The DSSS and one of the commercial PLC systems were designed as a direct conversion receiver; the other commercial module uses a superheterodyne architecture. The performance of the systems was tested under the influence of narrowband interference and additive Gaussian noise added to the transmission channel. It was found that the performance of the DSSS modem against singleton interference is better than that of commercial PLC transceivers by at least the processing gain. The performance of the DSSS modem was at least 6 dB better than the other modules tested under the influence of the additive white Gaussian noise on the transmission channel at data rates of 19.2 kB/s.

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Tesi sul tema "Wireless communication systems. Data transmission systems. Radio"

Ng, Ka Wai. "Generalized bit and power allocation for single and multi-user OFDM MIMO system in frequency selective fading channel /". View abstract or full-text, 2003. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202003%20NG.

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Labuschagne, Adriaan S. "The design of a telemetry system for Grumeti Reserves /". Thesis, Link to the online version, 2006. http://hdl.handle.net/10019.1/2542.

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Motahari, Bidgoli Seyed Mohammad Amin. "An Optical Design Configuration for Wireless Data Transmission". FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2439.

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The concept of 2D barcodes is of great relevance for use in wireless data transmission between handheld electronic devices. In a typical setup, any file on a cell phone for example can be transferred to a second cell phone through a series of images on the LCD which are then captured and decoded through the camera of the second cell phone. In this research, a new approach for data modulation in 2D barcodes is introduced, and its performance is evaluated in comparison to other standard methods of barcode modulation. In the proposed method, Orthogonal Frequency Division Multiplexing (OFDM) modulation is used together with Differential Phase Shift Keying (DPSK) over adjacent frequency domain elements to modulate intensity of individual pixels. It is shown that the bit error rate performance of the proposed system is superior to the current state of the art in various scenarios. A specific aim of this study is to establish a system that is proven tolerant to camera motion, picture blur and light leakage within neighboring pixels of an LCD. Furthermore, intensity modulation requires the input signal used to modulate a light source to be positive, which requires the addition of a dc bias. In the meantime, the high crest factor of OFDM requires a lower modulation index to limit clipping distortion. These two factors result in poor power efficiency in radio over fiber applications in which signal bandwidth is generally much less than the carrier frequency. In this study, it is shown that clipping a bipolar radio frequency signal at zero level, when it has a carrier frequency sufficiently higher than its bandwidth, results in negligible distortion in the pass band and most of the distortion power is concentrated in the baseband. Consequently, with less power provided to the optical carrier, higher power efficiencies and better receiver sensitivity will result. Finally, a more efficient optical integrated system is introduced to implement the proposed intensity modulation method which is optimized for radio over fiber applications.

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Gurung, Sanjaya. "Integrating environmental data acquisition and low cost Wi-Fi data communication". Thesis, University of North Texas, 2009. https://digital.library.unt.edu/ark:/67531/metadc12131/.

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This thesis describes environmental data collection and transmission from the field to a server using Wi-Fi. Also discussed are components, radio wave propagation, received power calculations, and throughput tests. Measured receive power resulted close to calculated and simulated values. Throughput tests resulted satisfactory. The thesis provides detailed systematic procedures for Wi-Fi radio link setup and techniques to optimize the quality of a radio link.

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Kriegler, Wouter. "A fixed-point DSP architecture for software-defined radio". Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/3029.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2009.
Due to ever evolving wireless communication standards and technologies, the need for more flexible radio terminals are becoming more sought after in order to adapt to these new standards. Software-defined radio offers a solution to this demand. Software-defined radio is a radio communication system where signal processing components that have typically been implemented in hardware are replaced by reconfigurable and re-useable software modules running on a digital processor. The need exists to rapidly create new SDR applications without designing an entire system from the ground up, and without specialised knowledge of the target platform. This thesis initially describes the design of a generic SDR architecture that is highly reconfigurable and promotes a high level of code re-use. The research forms part of a larger project to design a domain-specific language (DSL) in which to describe SDR functionality in a platform-independent way. In this thesis, the code synthesis from the DSL is extended to support the Freescale DSP563xx family.

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Rootman, Adriaan Cornelius. "Development of a remote wireless monitoring system for large farms". Thesis, Cape Peninsula University of Technology, 2012. http://hdl.handle.net/20.500.11838/1173.

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Thesis submitted in fulfilment of the requirements for the degree Master of Technology: Electrical Engineering at the Cape Peninsula University of Technology, 2012
This research project addresses the unique challenges of extensive farming in terms of monitoring and controlling remote equipment or events. Poorly maintained roads and escalating fuel costs increase difficulty of farming and the time spent on physically monitoring remote sites further reduces financial yields. The research showed that there are very few solutions that implement wireless or electronic technology to overcome the challenges associated with these isolated and arid areas and that a low-cost, long range wireless telemetry solution that is easy to use would be beneficial for the extensive farming industry. It was therefore the aim of this project to develop a remote monitoring and controlling solution that implements wireless technology to convey information of activities around the farm utilising electronic means. To be able to successfully develop a wireless telemetry solution that will accurately meet the needs of this specific sector of industry, market research was conducted. To guide the research, the QFD (quality function deployment) process for product development has been implemented. The research consisted out of various aspects including a survey, financial considerations and international comparisons. The research also aided in the understanding of the day-to-day activities and also the physical parameters of extensive farms. Also, currently available technologies and products were evaluated to establish whether similarities exist that will aid in the development of a new product. The development process was based on the results obtained in the market research and resulted in a wireless telemetry solution that overcame all the design challenges and proved to be technically feasible, successfully addressing the application requirements. Zigbee technology was utilized for wireless communication because it provided an off-the-shelf solution with a number of readily available development platforms from various technology providers. A communication range of up to 6 kilometres with a transmitted power of 11dBm was achieved for point-to-point communication and a mesh network topology has been implemented for even longer range and complete coverage on farms. Various types of measurements have been catered for, with custom-designed instrumentation which enabled measurements such as water levels, movement and analogue signals. Also, a basic user interface was developed to enable the user to monitor or control the equipment or events remotely from a personal computer, locally or even over the internet. The results of this research project showed that by carefully selecting available technologies and understanding the application, it is possible to develop a solution that addresses the monitoring and controlling needs associated with extensive farming. The wireless telemetry system that was developed resulted in a saving equal to 10% of the total expenses of the farms per year. The telemetry system is therefore a financially feasible solution with a payback period of less than 1 year and far below the initial estimated budget. Without the need to physically monitoring equipment and events, an increase in productivity and the expansion of the overall enterprise is a further benefit added unto the monetary savings. In addition to the financial benefits of implementing new wireless technology, this is an opportunity to contribute to a cleaner and more sustained future as a legacy for the next generation by reducing the carbon footprint of the farm.

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Schuartz, Fábio César. "Múltiplas antenas como alternativa para aumentar a taxa de extração de chaves secretas em redes veiculares com desvanecimento lento". Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1797.

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A comunicação em redes veiculares ad hoc (VANETs) é comumente dividida em dois cenários, chamados veículo-a-veículo (V2V) e veículo-a-infraestrutura (V2I). Objetivando estabelecer uma comunicação segura contra espiões, trabalhos recentes tem proposto a troca de chaves secretas baseado na variação da força do sinal recebido (RSS). Entretanto, o bom desempenho de tal método depende da taxa de variação do canal, sendo mais apropriado a cenários em que o canal varia rapidamente, como geralmente é o caso da comunicação V2V. Já na comunicação V2I, o canal normalmente possui desvanecimento lento. Neste trabalho, é proposta a utilização de múltiplas antenas com o intuito de gerar artificialmente um canal de desvanecimento rápido, permitindo assim a extração de chaves secretas através da RSS em um cenário V2I. Análises numéricas mostram que o modelo proposto pode obter desempenho superior, em termos de taxa de extração de bits secretos, do que o modelo de salto em frequência proposto na literatura.
The communication in vehicular ad hoc networks (VANETs) is commonly divided in two scenarios, namely vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I). Aiming at establishing secure communication against eavesdroppers, recent works have proposed the exchange of secret keys based on the variation in received signal strength (RSS). However, the performance of such scheme depends on the channel variation rate, being more appropriate for scenarios where the channel varies rapidly, as is usually the case with V2V communication. In the communication V2I, the channel commonly undergoes slow fading. In this work we propose the use of multiple antennas in order to artificially generate a fast fading channel so that the extraction of secret keys out of the RSS becomes feasible in a V2I scenario. Numerical analysis shows that the proposed model can outperform, in terms of secret bit extraction rate, a frequency hopping-based method proposed in the literature.

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Razavi, S. H. "Data transmission over TACS cellular radio". Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329178.

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Zhou, Yiqing, e 周一靑. "Advanced techniques for high speed wireless communications". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B29296080.

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Alastalo, Ari. "Microelectromechanical resonator-based components for wireless communications : filters and transmission lines /". Espoo VTT, 2006. http://www.vtt.fi/inf/pdf/publications/2006/P616.pdf.

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Più fonti

Libri sul tema "Wireless communication systems. Data transmission systems. Radio"

Wilamowski, Bogdan M. Industrial communication systems. 2^a ed. Boca Raton, Florida: CRC Press, 2011.

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Rajiv, Kumar, a cura di. Cellular digital packet data. Boston: Artech House, 1996.

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Gralla, Preston. How wireless works. 2^a ed. Indianapolis, Ind: Que, 2005.

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Gralla, Preston. How Wireless Works. Upper Saddle River: Pearson Education, 2003.

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(South), Korea, a cura di. Chŏnp'apŏp haesŏl: Chŏnp'apŏp ŭi haesŏk kwa sarye. Sŏul-si: Jinhan M&B, 2013.

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Gralla, Preston. Cómo funcionan las redes inalámbricas. Madrid: Anaya Multimedia, 2007.

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Wireless data networking. Boston: Artech House, 1995.

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Hosom, David S. Feasibility of wireless data transmission on ships. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1997.

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Wireless data technologies. Hoboken, NJ: J. Wiley, 2003.

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Data communication principles: For fixed and wireless networks. Boston: Kluwer Academic Publishers, 2003.

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Capitoli di libri sul tema "Wireless communication systems. Data transmission systems. Radio"

Cremonini, Marco, Ernesto Damiani, Sabrina Capitani di Vimercati e Pierangela Samarati. "Security, Privacy, and Trust in Mobile Systems". In Information Security and Ethics, 2095–102. IGI Global, 2008. http://dx.doi.org/10.4018/978-1-59904-937-3.ch140.

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Access to general purpose information and communication technology (ICT) is not equally distributed on our planet: developed countries represent about 70% of all Internet users, while its percentage of Internet hosts has raised from 90% in 2000 to about 99% in 2002. Things change dramatically if we look at mobile and wireless technology: developing countries already represent about 40% of mobile connections in 2000, with a foreseen growth rate that is faster in developing countries than in developed ones in the period 2000-2005 (mainly due to India and the People’s Republic of China). This trend is driven by the new perspectives offered by mobile electronic technology applications that provide an alternative to poor telecommunication infrastructures still common in many developing countries. The technological evolution in wireless data communications is introducing a rich landscape of new services relying on three main technologies: • proximity (or personal) area networks (PANs), composed of personal and wearable devices capable of automatically setting up transient communication environments (also known as ad hoc networks); • wireless local area network technologies (WLANs); and • a third generation of mobile telecommunications (3G), gradually replacing General Packet Radio Service (GPRS) and the related set of technologies collectively called “2.5 Generation” (2.5G). PAN is a new technology bringing the “always connected” principle to the personal space. On the other hand, 3G systems and WLANs have coexisted for a while; what is new is their interconnection, aimed at decoupling terminals and applications from the access method. 3G mobile networks already provide video-capable bandwidth, global roaming for voice and data, and access to Internet-rich online content. Thanks to their increasing integration, PANs, WLANs, and 3G networks will extend the user’s connectivity in a complementary and hierarchical manner; in the fullness of time, they will provide all the functionalities of an Integrated Services Multimedia Network (ISMN), enabling a whole set of new business models and applications. The fusion of these technologies will eventually result in an ultimate ubiquitous wireless system that will be operated from anywhere, including homes, business locations, vehicles, and even commercial aircrafts. However, although wireless communications provide great flexibility and mobility, they often come at the expense of security. Indeed, wireless communications rely on open and public transmission media that expose new vulnerabilities in addition to the security threats found in wired networks. A number of specific open issues and even inherent dangers, some of which had been already identified and described in the early stages of wireless technology adoption, are yet to be solved (Howard, 2000). For instance, with wireless communications, important and vital information is often placed on a mobile device that is vulnerable to theft and loss. In addition, information is transmitted over the unprotected airwaves, and finally, 3G networks are getting smaller and more numerous, causing opportunities for hackers and other abusers to increase.

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Venkataraman, Hrishikesh, Bogdan Ciubotaru e Gabriel-Miro Muntean. "System Design Perspective". In Advances in Wireless Technologies and Telecommunication, 287–309. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0083-6.ch012.

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The next generation of cellular networks has evolved from voice-based to data-centric communication. The recent focus has been mainly on high data-rate services like mobile gaming, high quality music, Internet browsing, video streaming, etcetera, which consumes lots of bandwidth. This puts a severe constraint on the available radio resource. In this chapter, the IEEE 802.16 based multihop WiMAX networks (802.16j) is introduced, and the system design is explained in detail. The chapter outlines the background and the importance of multihop wireless networks, especially in the cellular domain. Different types of multihop design for WiMAX are explained, along with a detailed analysis of the effect of the number of hops in the WiMAX networks. Further, in order to support next generation rich media services, the system design requirements, and challenges for real-time video transmission are explained.

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Mitra, Sulata. "Seamless Mobility Management". In Security, Privacy, Trust, and Resource Management in Mobile and Wireless Communications, 463–89. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-4691-9.ch019.

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The next generation wireless networks will be heterogeneous wireless environments because of the coexistence of a large variety of wireless access technologies. The different networks have different architectures and protocols. So it is difficult for a user to roam from one radio system to another which can be solved by using the Internet protocol as a common interconnection protocol as it needs no assumptions about the characteristics of the underlying technologies. An all-IP wireless network is an IP-based wireless access system that makes wireless networks more robust, scalable, and cost effective. The nodes in such a network are mobile nodes as they change their location and point of attachment to the Internet frequently. The mobility management is an important research issue in an all-IP wireless network for providing seamless roaming facility to mobile nodes from one wireless system to another. The dynamic resource management is also required in this environment to ensure sufficient resource in the selected route for transmission or reception of the data packets during seamless roaming of the mobile nodes. This chapter is aimed at the researchers and the policy makers making them aware of the different means of mobility management and resource management for mobile nodes in all-IP wireless networks.

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Wódczak, Michał. "Autonomic Cooperative Networking". In Encyclopedia of Information Science and Technology, Third Edition, 6132–42. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-5888-2.ch604.

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As it capitalises on spatio-temporal processing, cooperative transmission aims to improve the reliability of wireless communications through the exploitation of radio diversity provided by relay nodes assisting in the transmission between the source and destination nodes. The inclusion of network layer routines facilitates the orchestration of such cooperative data processing in terms of the pre-selection of the network nodes to be assigned to cooperating groups intended to express cooperative behaviour. Going further, as the system becomes more and more complex, there appears an urgent need to introduce certain dose of self-management from the global perspective so that numerous cooperative and non-cooperative set-ups may be formed simultaneously. This is where the autonomic system design comes into the picture as the main enabler for and the umbrella under which the concept of Autonomic Cooperative Networking may be realised.

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Sabelkin, Mike, e François Gagnon. "Data Transmission Oriented on the Object, Communication Media, Application, and State of Communication Systems". In Advancements and Innovations in Wireless Communications and Network Technologies, 117–32. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2154-1.ch009.

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

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Farraj, Abdallah K., Eman M. Hammad e Scott L. Miller. "Performance Studies for Spectrum-Sharing Cognitive Radios under Outage Probability Constraint". In Advances in Wireless Technologies and Telecommunication, 345–67. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-6571-2.ch013.

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This chapter investigates the performance of primary and secondary users in a spectrum-sharing cognitive environment. In this setup, multiple secondary users compete to share a channel dedicated to a primary user in order to transmit their data to a receiver unit. One secondary user is scheduled to share the channel, and to do so, its transmission power should satisfy the outage probability requirement of the primary user. Secondary users are ranked according to their channel strength, and performance measures are derived as a function of a generic channel rank. The performance of different scheduling schemes is also investigated. Further, the performance of the primary user is investigated in this environment. Numerical results are presented to verify the theoretical analysis and investigate the relation between the parameters of the communication environment and the performance measures of the users of the system.

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Tripathi, Meenakshi, Jyoti Gajrani e Vinesh Kumar Jain. "Mobile Security". In Advances in Wireless Technologies and Telecommunication, 43–59. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2342-0.ch003.

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Mobile communication has various important issues such as congestion control, scarcity of radio spectrum, bandwidth utilization, and security. With increased number of threats in mobile devices, security has become the most important issue now-a-days. Security can be considered primarily at two levels; wireless transmission medium and mobile data level, where malicious applications execute their behavior by exploiting vulnerabilities present in mobile OS. The chapter also focuses on the latter one as these attacks can be easily performed by targeting vulnerabilities present in OS. The content is specifically on Android Operating System security as Android has become the largest installed base of mobile platform. This chapter specifies these vulnerabilities and focuses on malicious intentions of latest and sophisticated malware in detail. The chapter covers static and dynamic analysis tools as well as focuses on limitations of these methods for analyses. The results for malware samples with emulator detection capabilities show that these malware behaves more as benign samples.

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Kourogiorgas, Charilaos, Nektarios Moraitis e Athanasios D. Panagopoulos. "Radio Channel Modeling and Propagation Prediction for 5G Mobile Communication Systems". In Advances in Wireless Technologies and Telecommunication, 1–30. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-8732-5.ch001.

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5G mobile communication networks are emerging in order to cover the extreme needs for high data rates for delivering multimedia data to mobile communication users. The required bandwidth may be found if millimeter wave bands are fully employed for the establishment of such cellular systems. In this Book Chapter the propagation issues for 5G mobile communication systems are rigorously analyzed and presented. Firstly, the most popular scenarios and architectures of the next generation mobile systems are described and the channel models utilized for the evaluation of physical layer techniques (air interface are given. Secondly, the channel effects are described, i.e. effects due to local environment of the transceivers, atmospheric effects and their combination and the state of the art on the modeling of these effects is analytically presented. Finally, future directions for the propagation and channel model prediction for the next generation mobile communication systems -5G millimeter wave cellular systems are analyzed. Open issues and technical challenges of millimeter wave (mmWave) 5G cellular systems are finally described.

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Domb, Menachem. "Advancements in Optical Data Transmission and Security Systems". In Cryptography - Recent Advances and Future Developments [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94835.

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Optical Communication (OC) for data transmission was introduced more than 30 years ago. It employs two main technologies, fiber optics using a physical wire and Free Space Optical (FSO) wireless transmission. Fiber optics has been well developed over the years in terms of distance, bandwidth, speed, reliability, and other enhancements that contribute to its use. Recent developments in FSO transmission has made it the mainstream and a better alternative compared to RF wireless transmission, concerning all parameters. In this chapter, we focus on advancements in OC that represent innovative ideas of how to enable new methods of secured optical data transmission in different ways and not simply as an extension to current methods and technologies.

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Habib, Irfan, Atiqul Islam, Suman Chetia e Samar Jyoti Saikia. "A New Coding Scheme for Data Security in RF based Wireless Communication". In Advances in Systems Analysis, Software Engineering, and High Performance Computing, 301–19. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8493-5.ch013.

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A radio-controlled (RC) aircraft is controlled remotely by a hand-held transmitter and a receiver within the craft. The working mechanism of such an arrangement designed using an AT89S51 microcontroller is reported in this chapter. The primary focus of the chapter is to describe the design of the interfacing of transceiver module with AT89S51 microcontroller and control the movement of the aircraft according to the instruction given remotely. The microcontroller reads the input given by the user and transmits the data to the receiver at the aircraft. The receiver module receives the transmitted signal and demodulates it and gives the data as serial sequence of bits at the output. The serial data are then given to the decoder which transforms the data from serial to parallel. This set of data is used to control motors and any related device. A special coding technique is used to secure the transmitted data.

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Atti di convegni sul tema "Wireless communication systems. Data transmission systems. Radio"

Kazakov, G. N., A. M. Petrakov e V. A. Shevtsov. "Radio Monitoring of Wireless Networks Using LoRa Data Transmission Technology". In 2020 Systems of Signals Generating and Processing in the Field of on Board Communications. IEEE, 2020. http://dx.doi.org/10.1109/ieeeconf48371.2020.9078640.

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Kashef, Mohamed, Richard Candell e Sebti Foufou. "On the Impact of Wireless Communications on Controlling a Two-Dimensional Gantry System". In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2896.

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Abstract Industrial wireless is essential to achieve the vision of future manufacturing systems which are highly dynamic and reconfigurable, and communicate large amounts of data. Main challenges of wireless deployment include the stochastic nature of the wireless channels and the harsh industrial transmission environment. In this work, a typical two-dimensional gantry system is controlled by a local controller which receives G-code commands wirelessly over a Wi-Fi network. The industrial wireless channel is replicated using a radio frequency (RF) channel emulator where various scenarios are considered and various wireless channel parameters are studied. The movement of the gantry system tool is tracked using a vision tracking system to quantify the impact of the wireless channel on the system performance. Numerical results are presented including the total run time of an industrial process and the dwell times at various positions through the process.

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Baskaran, M., e R. Prabakaran. "Photonic generation of microwave pulses using Stimulated Brillouin Scattering (SBS)-based carrier processing and data transmission for Radio over Fiber (RoF) systems". In 2016 International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET). IEEE, 2016. http://dx.doi.org/10.1109/wispnet.2016.7566158.

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Kluge, Martin, Jordi Sabater, Josef Schalk, Luong V. Ngo, Helmut Seidel e Ulrich Schmid. "Wireless Sensing of Physical Parameters Inside Hermetically Enclosed Conductive Envelopes". In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35481.

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In the modern aeronautics and aerospace industry, there is a manifold amount of applications emerging for wireless sensors. While many new systems are making use of radio transmitters, EADS Innovation Works has developed a concept for transmitting energy and data to the inside of hermetically sealed envelopes used for hydraulic accumulators, fuel tanks, oxygen bottles, etc. For such kind of metal enclosures, the use of radio frequency is impossible as the electromagnetic waves are blocked by the surrounding material. Classical approaches like using wire-based feed-throughs threaten the reliability of the overall system and hence, they are less attractive especially when safety relevant components are targeted. The system described in this paper makes use of ultrasonic transmission techniques in order to power and communicate with a wireless sensor inside a metal enclosure. An innovative platform and communication concept allows to efficiently read data from basically any type of low power commercial sensors of the shelf. Major design drivers for the overall system are a high level of integration and high reliability.

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Flaherty, Paul A. "CCS: A Railway Corridor Control System Utilizing Ultra Wideband Radio Technology". In ASME/IEEE 2004 Joint Rail Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/rtd2004-66015.

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Ultra Wide Band (UWB) radio is a unique technology which combines a megabit wireless local area network with a centimeter-resolution radiolocation (RADAR) capability over distances less than 100 meters. A linear chain of UWB nodes can be used to create a hop-by-hop data transmission network, which also forms a RADAR “corridor” along the chain. By co-locating such a chain of nodes along a railroad right-of-way, precise information on the location and velocity of trains could be distributed throughout the corridor. In addition, the radar corridor would detect the introduction of track obstacles such as rocks, people, and automobiles, as well as shifted loads and other high-wide train defects. Finally, the network of nodes would enable off-train communications with payload sensors, locomotive computers, and could also provide wireless connectivity for passenger service.

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Habib, Alexander J., Jeffery L. Barton, Randall M. Mathison e Michael G. Dunn. "Wireless Telemetric Data Acquisition and Real-Time Control for a High Measurement-Density Internal Heat Transfer Experiment". In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26408.

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This paper describes a wireless data transmission system for a large-scale rotating experiment to investigate the heat transfer in a three-passage serpentine test section. Patterned after the NASA HOST program, the current experiment extends the data set to larger aspect ratios including 1:2, 1:4 and 1:6. As with HOST, heat transfer is measured using the heated conducting segments technique, and the serpentine test section spins at rotation numbers representative of engine conditions. Rotating experiments are essential for capturing the representative operating conditions and complicated flow physics that must be understood to advance internal cooling technology for these high aspect ratio configurations. There are challenges associated with controlling the operating parameters and collecting accurate data for high measurement-density rotating experiments. This experiment requires that 140 copper panels be held at a constant temperature by independently controlling and recording the power supplied to a separate heater on each panel. This means there must be 140 temperature measurements, 140 pairs of heater power leads, enough power to drive all of these heaters, and data recording capacity left over to measure fluid temperatures and pressures. Traditional methods of transferring rotating signals to the stationary frame of reference (such as slip rings) are widely implemented but have practical limitations in the quantity of transferrable signals and the electrical current capacity of the individual channels. Alternatively, wireless transmission techniques were first developed decades ago, but their practical use has been limited by onboard power delivery requirements and cost. This paper describes the development of a new data transmission and control system that takes advantage of improvements in low-cost off-the-shelf electronics to create a battery powered and microprocessor controlled system for acquisition, storage, control, and wireless communication. These components are assembled to form an integral part of the rotating mechanical hardware. By handling high-fidelity microcircuit signal conditioning, data acquisition, feedback control, and data storage in the rotating frame and transmitting the results with two-way wireless communication, this system provides high measurement density and active feedback control that would have been impractical with a conventional slip-ring approach. The design and construction of the wireless control system for one full sidewall of the three-serpentine passage is described in detail. Its capability and functionality is demonstrated with operational data. It will be demonstrated that while all of the components in this system are readily available, the unique combination of this technology opens up a new world of measurement capabilities.

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Tse, Peter W., e Wei Guo. "An Ensemble Empirical Mode Decomposition-Based Lossy Signal Compression Method for a Remote and Wireless Bearing Condition Monitoring System". In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70495.

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Rolling bearings are one of the most widely used and most likely to fail components in the vast majority of rotating machines. A remote and wireless bearing condition system allows the bearings to be inspected in remote or hazardous environments and increases the machine reliability. To minimize the transmission loads of enormous vibration data for accurate bearing fault diagnosis, a lossy compression method based on ensemble empirical mode decomposition (EEMD) method was proposed for bearing vibration signals in this paper. The EEMD method inherits the advantage of the popular empirical mode decomposition (EMD) method and can adaptively decompose a multi-component signal into a number of different frequency bands of signal components called intrinsic mode functions (IMFs). After applying the EEMD method to the vibration signal, the impulsive signal component related to the faulty bearing is extracted. The noise and irrelevant signal components that are often embedded in the collected vibration signals were removed. In the bearing signal, the distribution for most of the extremes is around zero. Almost all meaningful extremes related to the defect are concentrated in a small fraction of the samples. Hence, this signal compression provides high compression ratio for the bearing vibration signal. To verify the effectiveness of this method, raw vibration signals were collected from an experimental motor and a real traction motor. The proposed lossy signal compression method was applied to these vibration signals to extract the bearing signals and compress them. A comparison of this compression method with the popular wavelet compression method was also conducted. Wirelessly transmitting these compressed data demonstrates that the proposed signal compression method provides high compression performance for bearing vibration signals. Furthermore, the fault diagnosis using the reconstructed signal indicates that most of the impulses relating to the bearing fault are retained, including their periodicity and amplitudes, which are vital for accurate bearing fault diagnosis. Therefore, the compression of the bearing vibration signal contributes not only on the decreases of the file size and the transmission time, but also on the extraction of faulty bearing features to improve the accuracy in signal analysis. With the help of this method, wireless data communication for the remote and wireless bearing condition monitoring system becomes highly efficient, even in a limited bandwidth environment and maintains accurate bearing fault detection without loss of features and the need of transmitting a large amount of vibration data.

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Sangeethapriya, S., e R. Amutha. "Reliable data transmission in wireless sensor networks". In 2014 International Conference on Information Communication and Embedded Systems (ICICES). IEEE, 2014. http://dx.doi.org/10.1109/icices.2014.7034188.

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Sugeno, Kazuki, Yukitoshi Sanada e Mamiko Inamori. "Data transmission using transmitter side channel estimation in wireless power transfer system". In 2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC). IEEE, 2014. http://dx.doi.org/10.1109/pimrc.2014.7136541.

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Yin, Liuguo, Changmian Wang e Geir E. Oien. "Energy Consumption Optimization in Data Transmission from Correlated Sensor Nodes". In 2007 4th International Symposium on Wireless Communication Systems. IEEE, 2007. http://dx.doi.org/10.1109/iswcs.2007.4392295.

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