Tesi sul tema "Radio (telecommunication system)"
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Sharkey, Jeffrey Allen. "Automated radio network design using ant colony optimization". Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/sharkey/SharkeyJ0508.pdf.
Testo completoKyösti, P. (Pekka). "Radio channel modelling for 5G telecommunication system evaluation and over the air testing". Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526219035.
Testo completoTiivistelmä Tämän väitöskirjan sisältönä on radiokanavamallinnus langattomia tiedonsiirtojärjestelmiä varten ja lisäksi mallien käyttöönottoa tulevien radiolaitteiden säteilevässä testauksessa. Uusia tietoliikennejärjestelmiä kehitetään jatkuvasti, yhtä lailla jatkuvasti kasvavien tiedonsiirtotarpeiden tyydyttämiseksi. Ensimmäisten verkkojen ja päätelaitteiden pitäisi olla saatavilla tulevaan viidennen sukupolven (5G) järjestelmään vuoden 2020 tietämillä. Työn tarkoituksena on määritellä kanavamalli 5G-järjestelmän simulointeja varten ja sitä edeltäen tunnistaa kanavamallin vaatimukset. Lisäksi tutkimuksen aiheena on 5G-laitteiden säteilevä (OTA) testaus häipyvässä radiokanavassa ja uuden testijärjestelmän määrittely tätä tarkoitusta varten. Ehdotetun testijärjestelmän keskeisenä toimintona on halutun sähkömagneettisen (EM) kentän tuottaminen testattavan laitteen ympärille. EM-kentän pitää olla kanavamallin mukainen ja toteuttaa sen häipymä-, tila-, polarisaatio-, doppler- ja viiveominaisuudet. Testijärjestelmän komponentit ja tärkeimmän suunnitteluparametrit pyritään selvittämään tässä työssä. Tutkimuksessa havaittiin, että ehdotettu karttapohjainen kanavamalli toteuttaa 5G-mallille asetetut vaatimukset. Simuloinnit osoittavat myös, että tyypillisessä kaupunkiympäristössä suosittu GSCM-malli yliarvioi kanavan kapasiteetin monen käyttäjän MIMO-tekniikka käytettäessä. Lisäksi osoitettiin sektoroidun OTA-järjestelmän, jossa hyödynnetään useita antenneja, radiokanavaemulaattoria sekä radiokaiutonta huonetta (MPAC), käyttökelpoisuus 5G-laitteiden testaukseen. Kyseisen testausjärjestelmän parametrit määriteltiin. 3GPP on tärkein foorumi, jolla 5G-standardeja luodaan. Siellä on hiljattain (2016) sovittu 5G-simulointeja varten kanavamalli, joka ei ole tässä työssä ehdotetun kaltainen. Standardoitu malli on tyypiltään GSCM ja se on johdettu suoraan edellisen sukupolven (4G) kanavamallista. Kirjoittaja olettaa tästä GSCM:n nykyisestä vahvasta asemasta huolimatta, että ehdotettu karttapohjainen kanavamalli lisää suosiotaan tulevaisuudessa. Parhaillaan (2017) on 3GPP:n RAN4-työryhmässä käynnissä 5G-päätelaitteiden (UE) testimenetelmien määrittelyvaihe. Väitöskirjassa tutkittua sektoroitua MPAC-menetelmää on ehdotettu työryhmälle standardoitavaksi. Vaikka mainittua menetelmää ei siellä standardoitaisikaan UE-testaukseen, niin voidaan olettaa menetelmän olevan hyödyllinen erityisesti tukiasemien säteilevään testaukseen
Smuts, Matthys. "Software modem for a software defined radio system". Thesis, Stellenbosch : University of Stellenbosch, 2007. http://hdl.handle.net/10019.1/1985.
Testo completoThe use of older and slower protocols has become increasingly difficult to justify due to the rapid pace at which telecommunications are advancing. To keep up to date with the latest technologies, the communications system must be designed to accommodate the transparent insertion of new communications standards in all the stages of a system. The system should, however, also remain compatible with the older standards so as not to demand an upgrade of the older systems. The concept of a software defined radio was introduced to overcome these problems. In a software defined radio system, the functionality of the communications system is defined in software, which removes the the need for alterations to the hardware during technology upgrade. To maintain interoperatibilty, the system must be based on a standardised architecture. This would further allow for enhanced scalability and provide a plug-andplay feature for the components of the system. In this thesis, generic signal processing software components are developed to illustrate the creation of a basic software modem that can be parameterised to comply fully, or partially, to various standards.
Larsson, Joachim. "CPU Load Control of LTE Radio Base Station". Thesis, Linköpings universitet, Reglerteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-123499.
Testo completoLabuschagne, 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.
Testo completoAburawi, Abdulrahman, e Sarija Salic. "Emergency Communication". Thesis, Malmö högskola, Fakulteten för teknik och samhälle (TS), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-20568.
Testo completoSenol, Gokberk. "Performance Analysis Of A Digital Communication System On Sea Platforms". Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615134/index.pdf.
Testo completoTanyer, Fatma Muge. "Design Of Log-periodic Dipole Array Feed And Wide Band Reflector Antenna System". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605948/index.pdf.
Testo completoand FORTRAN, a prototype single polarized log-periodic antenna is produced. Developments on the prototype antenna are performed, both to improve the electrical characteristics of the antenna and to make the final design realizable. After the performance of the single polarized log-periodic antenna is found satisfactory, dual polarized antenna is produced. Performances of both single and dual polarized log-periodic antennas are measured in the anechoic chamber at ASELSAN®
Inc. After the measurements of the antenna, using the currents at the bases of the dipoles, a reflector antenna is designed using &ldquo
MIR&rdquo
program written in FORTRAN, which is based on physical optics method. A method to calculate the aperture blockage of the reflector is developed. Simulation results of reflector antenna are given.
Kilicoglu, Nezaket. "Construction Of An Experimental Radar System". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612760/index.pdf.
Testo completoKurekli, Kenan. "System Parameter Adaptation Based On Image Metrics For Automatic Target Detection". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12604966/index.pdf.
Testo completoHsueh, Yu-Ting. "Frontiers of optical networking technologies: millimeter-wave radio-over-fiber and 100g transport system for next-generation high-data-rate applications". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43681.
Testo completoKasak, Kerem. "An Implementation And Algorithm Development For Uwb Through The Wall Imaging System". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12609025/index.pdf.
Testo completoSalmon, Brian P. "Optimizing LDPC codes for a mobile WiMAX system with a saturated transmission amplifier". Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-01262009-160431/.
Testo completoYuksekkaya, Mehmet. "Implementation And Performance Analysis Of The Dvb-t Standard System". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606904/index.pdf.
Testo completoAburas, Akram. "Operating System Based Perceptual Evaluation of Call Quality in Radio Telecommunications Networks. Development of call quality assessment at mobile terminals using the Symbian operating system, comparison with traditional approaches and proposals for a tariff regime relating call charging to perceived speech quality". Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5479.
Testo completoRootman, 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.
Testo completoThis 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.
Van, Dam Catharina Johanna Henrica. "Intelligent control of radio communication system". Thesis, Queen Mary, University of London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299184.
Testo completoWang, Li. "TDMA digital mobile radio transmission system". Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240335.
Testo completoShepherd, Mark. "Radio channel assignment". Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288047.
Testo completoWassell, Ian J. "Digital mobile radio". Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277683.
Testo completoNappier, Jennifer M. "An FPGA Abstraction Layer for the Space Telecommunications Radio System". Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1227033556.
Testo completoAtefi, A. "An investigation of radio wave propagation in mobile radio frequency bands". Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354537.
Testo completoKilic, Hasan Huseyin. "Design And Fabrication Of A High Gain, Broadband Microwave Limiting Amplifier Module". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613616/index.pdf.
Testo completoBria, Aurelian. "Hybrid cellular-broadcasting infrastructure systems : radio resource management issues". Licentiate thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3922.
Testo completoStevens, David Story. "TDMA slot allocation strategies for mobile packet radio networks". Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/9190.
Testo completoBrannon, Raymond James. "The radio spectrum requirements of broadband power line telecommunications systems". Thesis, Open University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430560.
Testo completoCarvalho, Nefi Julião. "Impact of the nonlinear phenomenon on wireless radio telecommunications systems". Master's thesis, Universidade de Aveiro, 2008. http://hdl.handle.net/10773/1996.
Testo completoA dimensão e heterogeneidade de recentes sistemas de telecomunicações sem fios impossibilitam a previsão do comportamento do sistema completo quando operado nos limites das suas capacidades. Isto torna irrealista o estudo do impacto do fenómeno não linear no desempenho dos sistemas em especial devido a que os resultados são diferentes quando estudados em separado ou embebidos num sistema. Este trabalho ultrapassa estas problemáticas através do uso de técnicas de co-simulação e de modelação do actual estado da arte as quais tornam possível uma representação mais realista do desempenho de um sistema. ABSTRACT: The dimension and heterogeneity of recent wireless radio telecommunication systems makes impracticable the prediction of the full system behavior when pushed to its performance limits. This makes unrealistic the study of the impact of the nonlinear phenomenon on the systems performance, especially because the results are different when studied alone or embedded in a system. This work overcomes these difficulties by using state-of-the-art cosimulation and modeling techniques that made possible the presentation of more realistic system performance evaluations.
Foster, Howard Mark Jameson. "High capacity cellular mobile radio systems". Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301208.
Testo completoLee, Chin-Chun. "CDMA for cellular mobile radio systems". Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240979.
Testo completoMkondweni, Ncedo Sandiso. "Design and implementation of linear robust networked control systems". Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1195.
Testo completoNetworked Control Systems is a control system where the plant and the controller exchange information via a shared communication network and the network is considered as part of the closed loop control system. Unfortunately the network introduces network induced random varying time delays and data packet loss amongst the communication network imperfections. The network delays are considered to be between the controller and the actuator and between the sensor and the controller. These network imperfections degrade the performance of the closed loop control system and result in closed loop system instability. The complexity of measuring the communication network imperfection in networked control systems makes it difficult for the control engineers to develop methods for design of controllers that can incorporate and compensate these imperfections in order to improve the performance of the networked control systems. In this thesis a co-simulation toolset called LabNS2 is developed to address the first problem of measuring the communication network imperfections by providing an ideal environment that can be used to investigate the influence of network time delays or packet loss. The software environment of the toolset is based on LabVIEWTM and Network Simulator Version 2 (NS2). A new robust predictive optimal controller design method is developed to address the problem of the destabilising effect of the network induced time delay between the controller and the actuator. The design approach is based on time shifting of the optimisation horizon and a state predictor. The design of the controller is based on a model of the plant with delay in the control vector equal to the delay between the controller and the actuator or to the sum of the delays between the controller and the actuator and between the sensor and the controller. The time shifting approach allows the design of the controller to be performed for a model without time delay. Then the control action is based on the future values of the state space vector estimates. The state predictor is developed to predict these future values of the state using the present and past values of the state estimates and control actions. This technique is made possible by the use of the plant model Transition Matrix. A Discrete Kalman Filter is modified to address the problem of the destabilising effect of the network induced time delay between the sensor and the controller. An additional state estimation vector is added to the filter estimate at every current moment of time. iv The developed methods are implemented for networked control of a dish antenna driven by two stepper motors. The outcomes of the thesis can be used for the education and fundamental research purposes, but the developed control strategies have significant sense towards the Square Kilometer Array projects and satellite systems industry.
National Research Foundation
Giortzis, Athanasios. "Channel assignment in mobile radio networks". Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266017.
Testo completoRazavi, S. H. "Data transmission over TACS cellular radio". Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329178.
Testo completoArowojolu, Adekunle Andrew. "Microcellular mobile radio measurements and modelling". Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266170.
Testo completoToh, Chai-Keong. "Protocol aspects of mobile radio networks". Thesis, University of Cambridge, 1996. https://www.repository.cam.ac.uk/handle/1810/273055.
Testo completoJohansson, Leif Albin. "Broadband millimetre-wave radio over fibre systems". Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272419.
Testo completoHo, Philip Shiu Wai. "Structural intermodulation interference in mobile radio systems". Thesis, City University London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305174.
Testo completoTusubira, F. F. "Low level multiplexing in cellular radio systems". Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383401.
Testo completoFeeney, Thomas Michael. "The complex narrowband UHF mobile radio channel". Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257146.
Testo completoKo, Yiu Fai. "Digital cellular mobile radio links and networks". Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280911.
Testo completoKoz, Alper. "Watermarking For 3d Representations". Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608886/index.pdf.
Testo completoWarner, Edward Steven. "Novel bandwidth utilization techniques for radio-determination systems". Thesis, Bangor University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316345.
Testo completoKotsopoulos, S. A. "Frequency planning techniques for cellular mobile radio systems". Thesis, University of Bradford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332176.
Testo completoHammuda, Husni. "Spectral efficiency of cellular land mobile radio systems". Thesis, University of Bristol, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279698.
Testo completoSammut, Anthony J. R. "Radio resource management for satellite personal communication networks". Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/843349/.
Testo completoBensebti, M. "Wideband radio propagation measurements and modelling at 60GHz". Thesis, University of Bristol, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319121.
Testo completoYoung, Michael C. S. "Application of adaptive equalisation to microwave digital radio". Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/11654.
Testo completoKidner, David B. "Digital terrain models for radio path loss calculations". Thesis, University of South Wales, 1991. https://pure.southwales.ac.uk/en/studentthesis/digital-terrain-models-for-radio-path-loss-calculations(6733f679-d3c0-4a25-916f-0464321ea520).html.
Testo completoAragoÌn-Zavala, Alejandro. "In-building cellular radio system design and optimisation using measurements". Thesis, University of Surrey, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273285.
Testo completoPettersen, Magne. "Three-Dimensional Radio Channel Modeling for Mobile Communications Systems". Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-89.
Testo completoThe work described in this report is within the area of three-dimensional (3D) radio channel modeling for mobile communications. The focus was towards rural areas, because radio coverage of rural areas is more costly when using higher frequencies, comparing UMTS to GSM. In addition seasonal and environmental variations are strongest here. The model used was a 3D radar model, comprised of a 2D vertical Tx-Rx-plane component and a 3D components to include off-axis scattering. The latter components are estimated using bistatic radar techniques. The model is able to provide an accurate estimation of the path loss (signal level), and is also able to estimate time dispersion and angular dispersion, taking into account off-axis contributions. Radio frequencies around 2 GHz were selected, as these are the most important frequency bands for 3. generation mobile systems, even though the envisaged approach supports radio planning for GSM 900 and WLAN systems.
A novel approach to the modeling of scattering from random rough surfaces for 3D channel modeling was developed. This amplitude/phase model is simple and accurate compared to conventional models. It makes no inherent assumption about the degree of roughness, making it suited to model all surfaces. The model outperforms the conventional models Plane surface, SPM, Kirchoff and Oren with respect to accuracy by 1.5 to 10 dB depending on the degree of roughness.
An experimental methodology to characterise random rough surfaces was developed. The work characterised natural surfaces such as asphalt, grass, agriculture, and forest, each of them having a different degree of roughness. Variations due to weather and seasonal changes were taken into account. Typical surface height variations estimated were 10 mm for asphalt, 25 mm for grass, 100 mm for ploughed field and 500 mm for forest. Snow reduced the apparent roughness of ploughed field by 50 %, water on grass increased the reflection coefficient by 50 %.
An analysis of the implications of the results on 3D channel modeling was performed using a demonstration model. The analysis included a comparison between 2D and 3D model prediction for different area types and land use classes. Also the prediction sensitivity to seasonal and weather variations and model parameter variations were inspected. A 3D model is necessary when the 2D component is attenuated more than typically 15 dB relative to free space, depending on area and land usage. In the network planning example Lillehammer (N) this attenuation of at least 15 dB existed in 40 % of all locations. Weather and seasonal variations may change the mean predicted value by up to 4-5 dB.
Jowett, Antony Peter. "Enhanced frequency management for automatic HF radio communication systems". Thesis, University of Hull, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292685.
Testo completo