Готові списки джерел за темами / WIRELES COMMUNICATION

Добірка наукової літератури з теми "WIRELES COMMUNICATION"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "WIRELES COMMUNICATION"

Feng Wang, M. T. Thai, Yingshu Li, Xiuzhen Cheng, and Ding-Zhu Du. "Fault-Tolerant Topology Control for All-to-One and One-to-All Communication in Wireles Networks." IEEE Transactions on Mobile Computing 7, no. 3 (March 2008): 322–31. http://dx.doi.org/10.1109/tmc.2007.70743.

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Handayani, Tri Febriana, Pande Ketut Sudiarta, and I. Made Oka Widyantara. "UJI KEAMANAN KOMUNIKASI VOIP MENGGUNAKAN SISTEM KEAMANAN SRTP-TLS PADA JARINGAN NIRKABEL." Jurnal SPEKTRUM 5, no. 1 (June 25, 2018): 13. http://dx.doi.org/10.24843/spektrum.2018.v05.i01.p02.

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

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Shrestha, Sujan, and Subarna Shakya. "Technical Analysis of ZigBee Wireless Communication." December 2020 2, no. 4 (January 5, 2021): 197–203. http://dx.doi.org/10.36548/jtcsst.2020.4.004.

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

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

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

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Hadi, Teeb Hussein. "Types of Attacks in Wireless Communication Networks." Webology 19, no. 1 (January 20, 2022): 718–28. http://dx.doi.org/10.14704/web/v19i1/web19051.

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

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Wang, Haichao, Jinlong Wang, Guoru Ding, and Zhu Han. "D2D Communications Underlaying Wireless Powered Communication Networks." IEEE Transactions on Vehicular Technology 67, no. 8 (August 2018): 7872–76. http://dx.doi.org/10.1109/tvt.2018.2832068.

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Ahmed, Iqrar, Heikki Karvonen, Timo Kumpuniemi, and Marcos Katz. "Wireless Communications for the Hospital of the Future: Requirements, Challenges and Solutions." International Journal of Wireless Information Networks 27, no. 1 (October 28, 2019): 4–17. http://dx.doi.org/10.1007/s10776-019-00468-1.

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

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Suhartono, Joni. "Merencanakan Keamanan Jaringan Komputer." ComTech: Computer, Mathematics and Engineering Applications 2, no. 1 (June 1, 2011): 467. http://dx.doi.org/10.21512/comtech.v2i1.2784.

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

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Rinne, Jukka, Jari Keskinen, Paul Berger, Donald Lupo, and Mikko Valkama. "M2M Communication Assessment in Energy-Harvesting and Wake-Up Radio Assisted Scenarios Using Practical Components." Sensors 18, no. 11 (November 16, 2018): 3992. http://dx.doi.org/10.3390/s18113992.

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

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

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

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Дисертації з теми "WIRELES COMMUNICATION"

Kodikara, Patabandi C. K. "Multimedia communications over 3G wireless communication systems." Thesis, University of Surrey, 2004. http://epubs.surrey.ac.uk/844270/.

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This thesis addresses the transmission of video over third generation radio access networks. The first part of the thesis investigates the capabilities of Universal Terrestrial Radio Access Networks (UTRAN) in terms of the provision of multimedia communications. The error performance and traffic requirements of real-time video transmission over circuit switched and packet switched connections are examined. The effect of network parameter settings upon video performances is evaluated, and optimum radio bearer configurations for the transmission of video are derived. A method of estimating received video quality after transmission over error prone environments is developed. The quality estimation is based on a distortion model, which accurately models the overall distortion seen in decoder frame reconstruction. This includes quantisation distortion, concealment distortion, and error propagation. Based on the developed performance model, optimum MTU (Maximum Transfer Unit) size for efficient wireless video communications over a packet switched access network is derived. The second part of the thesis investigates quality enhancement techniques for multimedia traffic transmitted over wireless channels. Quality enhancement is achieved at three levels of the transmission process: link level, application level and system level. Link level quality enhancement techniques are designed to optimise the allocation of link level parameter values according to the media characteristics. A novel Unequal Error Protection scheme and a novel Unequal Power Allocation scheme are designed to exploit the inherent diversity in the subjective importance of different sections of compressed media. The algorithms are developed and analysed for transmission of video over 3G wireless systems. The effectiveness of these algorithms is demonstrated through the results of simulated transmission over a UMTS channel. Application level quality enhancement techniques are designed to explore the time-varying nature of the wireless channel. A number of link adaptation schemes are proposed for real time video communication and real-time video streaming over 3G wireless systems. These algorithms are designed to enhance the perceptual video quality, and the system utilisation. This is achieved by adapting the allocated radio network parameters and the source parameters, according to a feedback channel condition. Simulation results show a significant performance improvement compared to non-adaptive schemes. Finally, system level adaptation techniques are designed for efficient radio resource allocation in multi-user scenarios. Two adaptive resource allocation schemes are proposed and analysed for real-time video communications in a UMTS system. The proposed algorithms are shown to provide improved performances in terms of average received video quality and user satisfaction. Key words: Wireless Communication, Multimedia communication. Video Transmission.

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Wang, Shendi. "Efficient transmission design for machine type communications in future wireless communication systems." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/23647.

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With a wide range of potential applications, the machine type communication (MTC) is gaining a tremendous interest among mobile network operators, system designers, MTC specialist companies, and research institutes. The idea of having electronic devices and systems automatically connected to each other without human intervention is one of the most significant objectives for future wireless communications. Low data rate transmission and the requirement for low energy consumption are two typical characteristics for MTC applications. In terms of supporting low cots MTC devices, industrial standards will be more efficient if designers can re-use many features of existing radio access technologies. This will yield a cost effective solution to support MTC in future communication systems. This thesis investigates efficient MTC waveform and receiver designs for superior signal transmission quality with low operational costs. In terms of the downlink receiver design, this thesis proposes a novel virtual carrier (VC) receiver system for MTC receivers, which aims to reduce the maximum bandwidth to improve the data processing efficiency and cost-efficiency by using analogue filters to extract only sub-carriers of interest. For the VC receiver systems, we thus reduce the sampling rate in order to reduce the number of subsequent processing operations, which significantly reduces the analogue-to-digital converter (ADC) cost and power consumption while providing high signal to interference noise ratio (SINR) and low bit to error rate (BER) to support low data rate MTC devices. Our theoretical equations account for the interference effect of aliasing on the sub-carrier location, and this helps the system designer to evaluate what kind of filters and receiver sampling rate can be used to balance the energy cost and detection performance. In terms of the uplink waveform design, considering the enhanced number of MTC devices in the future communication systems, i.e. the fifth generation (5G) communications, the same tight synchronisation as used in today appears not to be cost-effective or even possible. Synchronisation signals, which aim to provide a perfect time or frequency synchronisation in the current fourth generation (4G) communication systems (known as the long-term evolution, LTE), is much more costly for low data rate MTC transmissions. The system bandwidth will be significantly reduced if a base station tries to synchronise all received signals among hundreds or thousands MTC devices in one transmission time period. In terms of relaxing the synchronisation requirements, this thesis compares and analyses the side-lobe reduction performance for several candidate multi-carrier waveforms to avoid these problems. We also propose the infinite impulse response universal filtered multi-carrier (UFMC) system and the overlap and add UFMC system, which significantly reduce the processing complexity compared with the state of the art UFMC techniques. This thesis derives closed-form expressions for the interference caused by time offsets between adjacent unsynchronised MTC users. Our analytical equations can be used in both simple and complex time-offset transmission scenarios, and enable the system designer to evaluate the SINR, the theoretical Shannon capacity and the BER performance.

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Bezuidenhout, Quintus. "Satellite communications strategy selection for optimal LEO satellite communication." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71930.

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Thesis (MScEng)--Stellenbosch University, 2012.
ENGLISH ABSTRACT: A low earth orbit satellite system can be useful in numerous communication applications where physical connections are not possible. Communication time available from any point on earth to the satellite is less than one hour per day. This one hour is fragmented into smaller time slots due to the satellite orbiting. This is not much time to transfer data and there is even less time available to transfer data when there are other external factors affecting the system. It is thus crucial to optimise the satellite communications link so that more data can be transferred per orbit. The goal of this thesis is to improve the performance of a low earth orbit satellite communication channel by varying certain parameters of the system, such as the protocol used, modulation scheme, packet size, transmission power etc. and then to observe how these parameters influence the system. The protocols that were chosen to be implemented are CSMA-CA, CSMA-CA with DSSS technology and Round-Robin Polling. A simulator for each protocol was designed with the Opnet platform, so that specific parameters could be changed and the results observed, in order to optimise the communications link between the satellite and ground stations. The results showed that there is no particular configuration of modulation scheme, packet size, transmission power etc. presenting the best overall solution for LEO satellite communications. It must be considered what the specific LEO satellite application would be used for and the characteristics required by that specific application. A suitable configuration must subsequently be chosen from the set of configurations available to satisfy most of the application requirements.
AFRIKAANSE OPSOMMING: ’n Satelliet met ’n lae wentelbaan kan gebruik word in verskeie kommunikasie toepassings waar fisiese verbindinge nie noodwendig moontlik is nie. Die kommunikasietyd van enige punt van aarde af na die satelliet, is minder as een uur per dag. Hierdie tyd word nog verder verklein omdat die satelliet besig is om, om die aarde te wentel. ’n Uur is glad nie baie tyd om data oor te dra nie en in realiteit is daar nog minder tyd beskikbaar as daar eksterne faktore op die sisteem inwerk. Dus is dit baie belangrik om die satelliet kommunikasiekanaal te optimiseer sodat soveel moontlik data as moontlik oorgedra kan word per omwenteling. Die doel van hierdie tesis is om die deurset van die kommunikasiekanaal van n lae wentelbaan satelliet te optimiseer, deur verskeie parameters te verander soos, protokol wat gebruik word, modulasie skema, pakkie grootte, transmissiekrag ens. en dan waar te neem hoe dit die sisteem beïnvloed. Die protokolle wat geïmplementeer is, is CSMA-CA, CSMA-CA met DSSS tegnologie en Round-Robin Polling. ’n Simulator vir elke protokol was ontwerp in die Opnet simulasie platform, sodat die spesifieke parameters verander kon word om die resultate te bestudeer met die doel om die kommunikasiekanaal tussen die satelliet en grond stasies optimaal te benut. Die resultate het bewys dat daar geen spesifieke konfigurasie van modulasie skema, pakkie grootte, transmissiekrag ens. is wat die algehele beste oplossing is nie. Die spesifieke applikasie waarvoor die lae wentelbaan satelliet gaan gebruik word moet geanaliseer word sowel as die spesifieke karakteristieke van daai applikasie. Daarvolgens moet n unieke konfigurasie opgestel word wat meeste van die applikasie se behoeftes bevredig.

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Muhovic, Admir. "Secure Wireless Communication." Thesis, KTH, Kommunikationssystem, CoS, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92023.

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The need for and requests for utilization of wireless equipment are growing rapidly. Advantages of using wireless communication are easy to realize. Having access to electronically stored information no matter where you are is a big advantage. Furthermore, wireless communication is increasingly utilized in everyday work and there is a constant development of new wireless equipment. Today, utilization of wireless communication is very practical as well as effective. On the other hand, using wireless equipment and communication entails risk unless efforts are made to secure this communication. Some wireless protocols exist and are used, despite their being vulnerable to attacks. Additionally, the traffic can easily be eavesdropped. Incorrect installation of wireless equipment contributes to the vulnerabilities of wireless communication. Some of the IT-equipment available on the market today offers wireless communication. This equipment is increasingly used within FMV. Such equipment includes: laptops, PDAs, cellular phones, etc. This wireless equipment, according to FMV’s information security policy, must be approved from a security viewpoint before it can be used at FMV. Thus an analysis of risks associated with usage of wireless equipment must take place and the mechanisms necessary to ensure adequate security must be identified. The document “Requirements on Security Functions (Kraven på SäkerhetsFunktioner, KSF)” identifies the technical and/or administrative requirements for such equipment.</p> The aim of this thesis was to analyze if it is possible to utilize wireless equipment at FMV, specifically, if it can be connected to the internal LAN at FMV. In other words, the wireless equipment must be able to offer security protection corresponding to the information security class: HEMLIG/RESTRICTED. The thesis contains an analysis of which security functions are available on the market today and evaluates whether these security functions meet the requirements given in KSF. The result is a proposal for the best security mechanism(s) within the constraints of KSF and the available equipment. The thesis proposes a technical solution along with suitable security mechanisms. The advantages and drawbacks of each has been analyzed. Additionally, the thesis presents a number of (administrative) security policies in order to be able to handle security aspects which are not covered by the KSF.
Behoven och efterfrågan av mobil och trådlös utrustning är i dagsläget allt större. Fördelarna med att använda sig av trådlös kommunikation är enkla att inse. Att kunna ha tillgång till elektroniskt lagrad information oavsett var man än befinner sig är en stor fördel. Vidare implementeras trådlös kommunikation allt mer i det vardagliga arbetet samtidigt som utrustning för denna sorts kommunikation är i ständig utveckling. I slutändan är användandet av trådlös kommunikation väldigt praktiskt samtidigt som det är effektivt. Användandet av trådlös utrustning och kommunikation medför ett risktagande då denna typ av kommunikation allmänt är osäker. Detta eftersom teknologin fortfarande är i utvecklingsfasen. De i dagsläget aktuella trådlösa protokollen är sårbara för attacker och det är dessutom enkelt att avlyssna trafiken. Felaktig installation av utrustning bidrar dessutom också till att den trådlösa kommunikationen blir sårbar. En del av den IT-utrustning som idag finns tillgänglig ute på marknaden och som alltmer används inom FMV har möjlighet att kommunicera trådlöst med omgivningen. Exempel på sådan utrustning är bärbara datorer, PDA:er, mobiltelefoner mm. Denna typ av utrustning, dvs. trådlös utrustning, skall enligt FMVs informationssäkerhetspolicy godkännas från säkerhetssynpunkt innan den får tas i bruk på FMV. Det innebär att man utför en analys av vilka risker som är förknippade med användandet av trådlös utrustning samt att man identifierar adekvata skyddsåtgärder. Till sin hjälp använder man sig av Kraven på SäkerhetsFunktioner (KSF) som består av tekniska och/eller administrativa krav. Syftet med detta examensarbete var att undersöka om det finns möjlighet att använda trådlös utrustning på FMV, dvs. att denna används på interna LAN på FMV. Med andra ord skall den trådlösa utrustningen kunna erbjuda ett skydd motsvarande högst informationssäkerhetsklassen HEMLIG/RESTRICTED (H/R). Examensarbetet innefattar en analys av vilka säkerhetsfunktioner idag finns tillgängliga ute på marknaden och utvärderar huruvida dessa säkerhetsfunktioner uppfyller kraven givna i Kraven på SäkerhetsFunktioner (KSF). Resultatet är ett förslag på de bästa säkerhetsmekanismerna inom restriktionerna av KSF och den tillgängliga utrustningen. Examensarbetet föreslår en teknisk lösning med lämpliga säkerhetsmekanismer. Dess för- och nackdelar har analyserats. Examensarbetet presenterar dessutom ett antal (administrativa) säkerhets policies som hanterar säkerhetsaspekter som inte omhändertas av KSF.

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Cottingham, David Naveen. "Vehicular wireless communication." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611258.

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Yin, Hujun. "Cross layer design and optimization of wireless networks /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/5904.

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Dong, Lu. "MIMO Selection and Modeling Evaluations for Indoor Wireless Environments." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19767.

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Анотація:

Array-to-array, or multiple-input multiple-output (MIMO), links are known to provide extremely high spectral efficiencies in rich multipath environments, such as indoor wireless environments. The selection of a subset of receiver array antennas for a MIMO wireless link has been studied by many as a way to reduce cost and complexity in a MIMO system while providing diversity gain. Combined with a switched multi-beam beamformer, it becomes the beam selection system that can gain high signal-to-interference ratio (SIR) improvement in an interference-imited environment. The objective of this research is to evaluate the performance of low-complexity antenna or beam subset selection methods for small MIMO networks. The types of networks include (1) point-to-point MIMO links with out-of-system interference, (2)multi-user networks with a single, but possibly spatially distributed access point. We evaluate various selection techniques on measured indoor channels, which has not been done before. We propose a new practical selection metric, the peak-to-trough ratio of orthogonal frequency division multiplexing (OFDM) training symbols. We also compare antenna and beam selection on measured indoor channels under more general conditions than has previously been done. Finally, we consider some channel modeling issues associated with beamformers. We investigate the validity of three types of statistical MIMO channel models. A new beamformer is designed based on the ideal of the ``Weichselberger model.'

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Dagne, Carl, Johan Bengtsson, and Ingemar Lindgren. "Microwave Wireless Communication System." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-232.

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The purpose of the project was to develop the hardware to a microwave wireless system working

at the frequency 2.45 GHz. The functionality of the system should also be easy to understand

since the system is to be used in an educational purpose. Much time has been spent impedance

matching components, a task that proved to be harder than we expected. Other work that has been

is layout of all parts, filter construction and the writing of an easy to understand thesis. After the

parts had been completed, they were tested in a network analyzer and/or spectrum analyzer.

Successful full system test has been done up to 400 meters, the length the system is to be used

for.

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Herbert, Steven John. "Wireless communication in vehicles." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/280675.

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There is an increasing interest in the deployment of wireless communication systems in vehicles. The motivation for this work is to provide a fundamental characterisation of the in-vehicle Electromagnetic (EM) wave propagation environment, and to demonstrate how this can be used to aid the deployment of wireless communication systems in vehicles. The fundamental characterisation of the in-vehicle EM wave propagation environment presented in this dissertation yields a number of useful outcomes. The instantaneous impulse response of the in-vehicle channel is characterised, which is presented in the form of a statistical model for arriving rays. Noticing that it is impractical to undertake a full statistical characterisation of the time-varying impulse response, the time variation of the in-vehicle channel is instead characterised as a Doppler spread. This approach provides parameters which are sufficient to perform an information theoretic analysis to lower bound the capacity of the in-vehicle channel. For typical operating conditions, it is found that the channel capacity is approximately equal to that of the same channel with perfect channel state information available at the receiver. Having established the fundamental EM wave propagation characteristics for a single in-vehicle wireless channel, the EM properties of the cavity itself are characterised. This is achieved through a thorough investigation into the analogy between vehicle cavities and reverberation chambers, specifically considering the quality factor (and hence time constant), EM isolation, and electric field uniformity of typical vehicle cavities. This approach yields the important insight that the root mean square delay spread is approximately the same for all wireless links in a typical vehicle cavity. Also, that the angular spread of energy received at any given location (away from the cavity boundaries) is approximately uniform, and that over short distances the coherence distance is well defined, and hence Multiple Input Multiple Output antenna arrays should work well in vehicles. To what extent a typical wireless system can exploit this characterisation depends on how well the parameters can be estimated by a typical wireless communication system. This is also addressed, specifically investigating the estimation of the cavity time constant, and channel time variation. It is found that both of these can be estimated well using a typical wireless sensor network system.

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Jiang, Junyi. "Optical wireless communication systems." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/387239/.

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In recent years, Optical Wireless (OW) communication techniques have attracted substantial attention as a benefit of their abundant spectral resources in the optical domain, which is a potential solution for satisfying the ever-increasing demand for increased wireless capacity in the conventional Radio Frequency (RF) band. Motivated by the emerging techniques and applications of OW communication, the Institute of Electrical and Electronics Engineers (IEEE) had released the IEEE standard 802.15.7 for short-range optical wireless communications, which categorised the Physical layer (PHY) of the OW communication into three candidate-solutions according to their advantages in different applications and environments: 1) Physical-layer I (PHY I): Free Space Optical (FSO)communication employs high-intensity Light Emitting Diodes (LEDs) or Laser Diodes (LDs) as its transmitter. 2) Physical-layer II (PHY II) uses cost-effective, low-power directional white LEDs for the dual function of illumination and communication. 3) Physical III (PHY-III) relies on the so-called Colour-Shift Keying (CSK) modulation scheme for supporting high-rate communication. Our investigations can be classified into three major categories, namely Optical Orthogonal Frequency Division Multiplexing (OFDM) based Multiple-Input Multiple-Output (MIMO) techniques for FSO communications in the context of PHY I, video streaming in PHY-II and the analysis and design of CSK for PHY-III. To be more explicit, in Chapter 2 we first construct a novel ACO-OFDM based MIMO system and investigate its performance under various FSO turbulence channel conditions. However, MIMO systems require multiple optical chains, hence their power consumption and hardware costs become substantial. Hence, we introduced the concept of Aperture Selection (ApS) to mitigate these problems with the aid of a simple yet efficient ApS algorithm for assisting our ACO-OFDM based MIMO system. Since the channel conditions of indoor Visible Light Communication (VLC) environments are more benign than the FSO-channels of Chapter 2, directional white LEDs are used to create an “attocell” in Chapter 3. More specifically, we investigate video streaming in a multi-Mobile Terminals (MTs) indoor VLC system relying on Unity Frequency Reuse (UFR) as well as on Higher Frequency Reuse Factor based Transmission (HFRFT) and on Vectored Transmission (VT) schemes. We minimise the distortion of video streaming, while satisfying the rate constraints as well as optical constraints of all the MTs. In Chapter 4 we analyse the performance of CSK relying both on joint Maximum Likelihood (ML) Hard-Detection (HD), as well as on the the Maximum A posteriori (MAP) criterion-based Soft-Detection (SD) of CSK. Finally, we conceive both two- stage and three-stage concatenated iterative receivers capable of achieving a substantial iteration gain, leading to a vanishingly low BER.

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Книги з теми "WIRELES COMMUNICATION"

Broadband wireless communications: 3G, 4G, and wireless LAN. Boston: Kluwer Academic Publishers, 2001.

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Wireless optical telecommunications. London: ISTE Ltd., 2012.

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Wireless communication. New Delhi: Oxford University Press, 2009.

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Sayre, Cotter W. Complete wireless design. 2nd ed. New York: McGraw-Hill, 2008.

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Sayre, Cotter W. Complete Wireless Design. New York: McGraw-Hill, 2008.

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Michael, Moher, ed. Modern wireless communications. Upper Saddle River, N.J: Pearson/Prentice Hall, 2005.

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Prathima, Agrawal, ed. Wireless communications. New York: Springer, 2006.

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Sheikh, Asrar U. H. Wireless Communications. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/978-1-4419-9152-2.

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Vitetta, Giorgio M., Desmond P. Taylor, Giulio Colavolpe, Fabrizio Pancaldi, and Philippa A. Martin. Wireless Communications. Chichester, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118576618.

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Zhang, Keith Q. T. Wireless Communications. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781119113263.

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Частини книг з теми "WIRELES COMMUNICATION"

Kohno, Ryuji. "Spatial and Temporal Communication Theory Using Software Antennas for Wireless Communications." In Wireless Communications, 293–321. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4757-2604-6_15.

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Higgins, Henry. "Wireless Communication." In Body Sensor Networks, 155–88. London: Springer London, 2014. http://dx.doi.org/10.1007/978-1-4471-6374-9_4.

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Kilinc, Enver Gurhan, Catherine Dehollain, and Franco Maloberti. "Wireless Communication." In Analog Circuits and Signal Processing, 77–103. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-21179-4_4.

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Cameron, Neil. "Wireless Communication." In Arduino Applied, 311–23. Berkeley, CA: Apress, 2018. http://dx.doi.org/10.1007/978-1-4842-3960-5_17.

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Krommenacker, Nicolas, Vincent Lecuire, Nicolas Salles, Serafim Katsikas, Christos Giordamlis, and Christos Emmanouilidis. "Wireless Communication." In E-maintenance, 247–72. London: Springer London, 2010. http://dx.doi.org/10.1007/978-1-84996-205-6_10.

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Maclay, Walter N. "Wireless Communication." In Closing the Care Gap with Wearable Devices, 115–20. New York: Productivity Press, 2022. http://dx.doi.org/10.4324/9781003304036-15.

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Bhagyaveni, M. A., R. Kalidoss, and K. S. Vishvaksenan. "Wireless Communication." In Introduction to Analog and Digital Communication, 203–35. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003338673-13.

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Bräunl, Thomas. "Wireless Communication." In Embedded Robotics, 131–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05099-6_9.

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Kühner, Jens. "Wireless Communication." In Expert .NET Micro Framework, 203–8. Berkeley, CA: Apress, 2009. http://dx.doi.org/10.1007/978-1-4302-2388-7_7.

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Biswas, Rajib. "Wireless Communication." In Advanced Wireless Communication and Sensor Networks, 3–9. New York: Chapman and Hall/CRC, 2023. http://dx.doi.org/10.1201/9781003326205-2.

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Тези доповідей конференцій з теми "WIRELES COMMUNICATION"

Kalaivani, R., and J. Vijithaananthi. "Intelligent and secure communication over wireles devices using network localization." In 2017 International Conference on I-SMAC (IoT in Social, Mobile, Analytics and Cloud) (I-SMAC). IEEE, 2017. http://dx.doi.org/10.1109/i-smac.2017.8058338.

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Pramono, Wahyudi Budi, Pandu Setiawan, and Firdaus. "Solar power supply for ZigBee wireles sensor network." In 2016 International Seminar on Application for Technology of Information and Communication (ISemantic). IEEE, 2016. http://dx.doi.org/10.1109/isemantic.2016.7873862.

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Nishida, Yuta, Yosuke Tanigawa, and Hideki Tode. "Cooperative packet transmission scheduling between multicast and unicast flows for communication efficiency in wireles LAN." In 2018 15th IEEE Annual Consumer Communications & Networking Conference (CCNC). IEEE, 2018. http://dx.doi.org/10.1109/ccnc.2018.8319282.

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Shin, Daekyo, Soohyun Jang, and Pusik Park. "A Test Result on the Performance of Next Generation ITS Communication in the Railway Environment." In 2017 Joint Rail Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/jrc2017-2202.

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Recently the demand of wireless communications technology in railway field has increased for the purpose of safe operation and economical construction and reducing operating costs. The real implementation test was carried out in order to apply the next generation ITS wireless communication technology (WAVE: Wireless Access Vehicular Environment) to the railway. WAVE communication is suitable for high-speed environment, have a reliable wireless communication performance. This paper presents the results of test about installing the WAVE base station / WAVE Terminal for applying to the railway and measure the performance evaluation conducted.

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Deng, Qiuzhuo, Lu Zhang, Hongqi Zhang, Zuomin Yang, Xiaodan Pang, Vjačeslavs Bobrovs, Sergei Popov, et al. "Quantum Noise Secured Terahertz Communications." In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/ofc.2023.w2a.33.

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The quantum noise based terahertz signal encryption scheme is proposed, a 16 Gbits-1 secure terahertz communication system at 300 GHz with the optical communication realms is demonstrated, taking a significant step toward high-security wireless communications.

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J. M., Aravind, and Arul Teen Y. P. "Oceanic Turbulence and Beam Propagation Characteristics of Underwater Optical Wireless Communication: A Brief Survey." In The International Conference on scientific innovations in Science, Technology, and Management. International Journal of Advanced Trends in Engineering and Management, 2023. http://dx.doi.org/10.59544/tgts6433/ngcesi23p92.

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Underwater wireless communication (UWC) means the transmission of information using wireless channels through the underwater, i.e. radio frequency waves (RF), acoustic waves and optical waves in an unguided water environment. In this review article we focus on underwater optical wireless communications (UWOCs) using optical waves as transmission medium. UWOCs have a much higher communication frequency and therefore a much higher data rate compared to RF and acoustic counter-parts. Due to this high-speed data transfer advantage, UWOC has been very attractive over the past few years. Many application shave been proposed in UWOC systems for protection of the environment, underwater exploration, emergency alerts and military operations etc. However, underwater absorption, scattering and turbulence processes will introduce attenuation and fading to light propagation and then degrade the performance of underwater wireless optical communications (UWOC). In this review paper we give a detailed overview of turbulence and beam propagation characteristics of different water bodies in UWOC.

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M. Gallant, Linda, Gloria M. Boone, and Gregg Almquist. "Wireless Organizational Communication: A Framework for Communicative Informatics." In 2003 Informing Science + IT Education Conference. Informing Science Institute, 2003. http://dx.doi.org/10.28945/2709.

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As mobile communication becomes more pervasive, there is an increasing need to study the potential uses of wireless organizational communication. The difficulty in analyzing information and communication technology (ICT) in organizational communication is the unintentional split between information processes perspectives and human communication perspectives in the discussions of workplace technology. By merging two constructs, organizational informatics and organizational sensemaking, this paper develops a communicative organizational informatics (COI) framework, which provides a robust perspective on how people communicate through the uses of technology in organizational settings. This communicative informatics framework offers a powerful lens to study the meanings, understandings, uses and gratifications, and potentials of technology in organizations and how it can facilitate workplace communication. A COI analysis of a personal digital assistant (PDA), a Palm VII, with a live wireless connection to a company sales database is examined by applying a usability testing methodology.

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Zhong, Xu, and Yu Zhou. "Establishing and Maintaining Wireless Communication Coverage Among Multiple Mobile Robots via Fuzzy Control." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47989.

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This paper addresses the critical issue of establishing and maintaining desired wireless communication connectivity in a team of collaborative mobile robots, which is highly demanded for reliable functioning of multi-robot systems but challenging in realistic environments. The signal propagation of wireless communications among mobile robots is affected by not only the transmission power and distance but also obstacles and other environmental conditions as well as robot movement, which result in signal loss, attenuation, multi-path fading and shadowing. Consequently, the communication condition among mobile robots in a physical environment is usually unstable, and it is difficult to accurately predict the actual communication ranges of robots. We propose a decentralized control strategy which, based on perceived link quality, adopts fuzzy control to accommodate the fluctuating communication condition, and approach and maintain desired and reliable communication connections among neighboring robots. The effectiveness of the proposed scheme has been verified in several simulated environments with different signal propagation conditions based on a probabilistic signal propagation model.

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Himsoon, T. Kee, and W. Pam Siriwongpairat. "Design and Analysis of 220 MHz RF Communications for Interoperable Positive Train Control System." In 2011 Joint Rail Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/jrc2011-56073.

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The interoperable positive train control (PTC) system uses radio frequency (RF) in the 220 MHz band for wireless communications. Robust and reliable 220 MHz RF communication is critical to the success of the interoperable PTC system. To ensure proper operation of the interoperable PTC system, it is thus crucial to properly engineer and evaluate RF performance of communications from wayside devices and base stations to trains operating along PTC controlled track. This paper presents a design of wireless communications over the 220 MHz band for the interoperable PTC system. Performance of the designed 220 MHz PTC communications is analyzed and theoretical predictions are provided. The paper also presents a simulation system architecture for analyzing the performance of PTC communications over the 220 MHz band. The simulation system test bed integrates a message generator, RF channel simulator, and PTC software-defined radio prototypes configured as a base, locomotive, or wayside radio. Extensive simulations were conducted to determine RF performance of PTC radio communications in various scenarios including flat terrain and city environments. Simulation results are given and compared to the theoretical predictions.

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Katterbauer, Klemens, and Abdallah Al Shehri. "Smart MIMO-OFDM Wireless Communication Frameworks for Subsurface Wireless Sensor." In SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210750-ms.

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Abstract Wireless communication in subsurface wells and reservoir has been a major challenge in ensuring robust data transmission, and reliable communication between the sensors. Challenges from the multiple reflection as well as other external factors, makes subsurface communication a unique challenge for modern communication algorithms. While multiple-Input, multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) communication has been extensively implemented in wireless communication for signal processing, unique challenges arise in subsurface reservoirs caused by unknown formation properties and fluid movements. We present a new smart MIMO-OFDM algorithm for wireless communication in subsurface reservoirs. The new algorithm integrates both MIMO and OFDM into a deep learning framework. It optimizes the communication quality as well as reliability of the communication between the various subsurface wireless devices. The joint integration and smart adjustment leverages the power of both algorithms simultaneously, and allows significantly improved communication robustness between the wireless devices. We tested the smart MIMO-OFDM on a synthetic carbonate reservoir formation with multiple wireless sensors and wireless appliances. Fracture Robots (FracBots, about 5 mm in size) technology will be used to sense key reservoir parameters (e.g., temperature, pressure, pH and other chemical parameters). The technology is comprised of a wireless microsensor network for mapping and monitoring fracture channels in conventional and unconventional reservoirs. The system establishes wireless network connectivity via magnetic induction (MI)-based communication, since it exhibits highly reliable and constant channel conditions with sufficiently communication range inside an oil reservoir environment. The results exhibited strong performance of the wireless communication, hence providing reliable and robust subsurface wireless communication. The novel framework presents a vital component in enhancing subsurface wireless communication and achieve robust data transfer. The results outline the opportunity for wireless communication to become a critical component for subsurface communication.

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Звіти організацій з теми "WIRELES COMMUNICATION"

Tailor, Sanjay. Wireless Communications. Fort Belvoir, VA: Defense Technical Information Center, June 1996. http://dx.doi.org/10.21236/ada310023.

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Nguyen, Clark T. MEMS For Wireless Communications. Fort Belvoir, VA: Defense Technical Information Center, September 2002. http://dx.doi.org/10.21236/ada408056.

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Glatzmaier, Greg. Multi-Heliostat Wireless Communication Assessment. Office of Scientific and Technical Information (OSTI), June 2014. http://dx.doi.org/10.2172/1505157.

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Bartone, Erik J., and John F. Carbone. Low Frequency Wireless Communications Technology. Office of Scientific and Technical Information (OSTI), January 2004. http://dx.doi.org/10.2172/820935.

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Krogmeier, J., and Darcy Bullock. Statewide Wireless Communications Project, Volume 1: Communication Field Tests for Satellite, Cellular, and Spread Spectrum Radio. West Lafayette, IN: Purdue University, 2008. http://dx.doi.org/10.5703/1288284314218.

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Rajaravivarma, Veeramuthu, and Krishna Sivalingam. Wireless Connectivity to ATM Communication Grid. Fort Belvoir, VA: Defense Technical Information Center, August 1998. http://dx.doi.org/10.21236/ada367858.

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Tassiulas, Leandros. Research Problems in Wireless Communication Networks. Fort Belvoir, VA: Defense Technical Information Center, March 1998. http://dx.doi.org/10.21236/ada380014.

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Li, Xiaohua E. Cooperative Communications for Wireless Information Assurance. Fort Belvoir, VA: Defense Technical Information Center, July 2005. http://dx.doi.org/10.21236/ada437086.

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Li, Xiaohua. Wireless Information Assurance and Cooperative Communications. Fort Belvoir, VA: Defense Technical Information Center, March 2006. http://dx.doi.org/10.21236/ada449197.

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Scarfone, K. A., C. Tibbs, and M. Sexton. Guide to securing WiMAX wireless communications. Gaithersburg, MD: National Institute of Standards and Technology, 2010. http://dx.doi.org/10.6028/nist.sp.800-127.

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