Dissertations / Theses on the topic 'Mobile signal'
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Athanasiadis, Tasso, and tas atha@bigpond net au. "Signal Processing Techniques for Mobile Multimedia Systems." RMIT University. Electrical and Computer Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080123.115457.
Full textGOMES, RENATO ARREGUI. "RADIO SIGNAL BEHAVIOUR ON MICROCELLULAR MOBILE ENVIRONMENTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1999. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7473@1.
Full textCom o aumento da demanda pelos serviços celulares se faz necessário estudar e desenvolver técnicas cada vez mais sofisticadas para a melhoria da capacidade e da qualidade dos sistemas celulares. Uma destas é a utilização moderada de microcélulas em regiões urbanas, e em algumas situações em regiões suburbanas. Os maiores problemas da utilização de microcélulas são suas características de propagação, bem diferentes das características das células convencionais. Para melhor compreender as características de propagação de um sinal rádio móvel num ambiente microcelular, este trabalho se propôs a fazer um estudo experimental onde, fenômenos como forma de células, efeitos de sombreamento, multipercurso e outros, foram analisados. Um laboratório móvel foi montado e uma grande campanha de medidas foi realizada em ambientes urbanos de características diferentes. Análises determinísticas e estatísticas, foram realizadas para se determinar parâmetros como o fator de queda do sinal com a distância e o desvio padrão da variabilidade do sinal. Estes resultados são importantes para o cálculo aproximado da cobertura do sinal em regiões semelhantes às estudadas. Especial atenção foi dada ao cálculo do ponto de quebra da dependência do sinal com a distância. Este ponto define a transição entre a região de campo próximo e a região de difração, sendo fundamental para estudos de cobertura. Uma importante contribuição foi na determinação da dependência da cobertura do sinal com a altura da antena transmissora. Os resultados medidos ajudaram a caracterizar a célula e conseqüentemente obter informações para localizações ótimas das altura das antenas, além de definir a melhor cobertura que estas alturas podem oferecer. Uma análise estatística da variabilidade do sinal foi realizada e distribuições de probabilidade foram testados frente aos resultados experimentais. A determinação de parâmetros importantes destas distribuições ajudou na verificação da aderência destes modelos aos resultados medidos. Os resultados são de extrema importância para esclarecer aspectos de propagação do sinal em microcélulas e disponibilizar dados para a elaboração de modelos de predição para o cálculo da cobertura do sinal para o projetista, resultando numa melhoria da qualidade e da capacidade do sistema microcelular.
The ever-increasing demand for cellular services raises the necessity of developing more sophisticated techniques to improve system quality and capacity. One of the techniques is the use of microcells in urban and occasionally suburban regions. However, the major problems facing the microcell deployment are the microcells peculiar propagation characteristics, which are very different from the conventional cellular systems. In order to address this problem, an experimental study of cell shape, shadowing effects and multipath, was carried out. A mobile laboratory was assembled and extensive measurements on different urban environments were performed. Deterministic and statistical analysis were carried out to find the parameters such as path loss versus distance factor, and the standard deviation of signal variability. Special attention was given to the determination of the breaking point, transition between the near field and diffraction regions on line-of-sight path. An important contribution was on the study of the effects of transmitter antenna height on coverage. The measured results will help on cell characterization and on finding the best height for the base station antennas. A statistical analysis of signal variability was performed to determine the best-fit probability distribution function with parameters carefully calculated. The collected results are of extreme importance to clarify propagation aspects of microcellular signal and to make it available a huge data bank for elaboration of better prediction models which will produce better quality and capacity of the microcellular systems.
Landqvist, Ronnie. "Signal processing techniques in mobile communication systems : signal separation, channel estimation and equalization /." Karlskrona : Blekinge Institute of Technology, 2005. http://www.bth.se/fou/Forskinfo.nsf/allfirst2/98bf8bfb44d67d86c1257099003e2fc1?OpenDocument.
Full textHolm, Rasmus. "Energy-Efficient Mobile Communication with Cached Signal Maps." Thesis, Linköpings universitet, Programvara och system, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-124607.
Full textSonbas, Buket. "Signal Processing for Sensor Based Navigation of Mobile Robot." Thesis, Högskolan i Gävle, Avdelningen för elektronik, matematik och naturvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-14230.
Full textPrihodko, Nikolajs. "Machine Learning for Forecasting Signal Strength in Mobile Networks." Thesis, Linköpings universitet, Statistik och maskininlärning, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-154466.
Full textChitraranjan, Charith Devinda. "Tracking Vehicles from Mobile Phone Received Signal Strength Sequences." Diss., North Dakota State University, 2015. http://hdl.handle.net/10365/25527.
Full textMehta, Mehul. "Power control for a mobile satellite system." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245306.
Full textNordio, Alessandro. "Advanced signal processing algorithms for 3rd generation wireless mobile systems /." [S.l.] : [s.n.], 2002. http://library.epfl.ch/theses/?nr=2550.
Full textWong, Hak Lim. "Signal strength-based location estimation in two different mobile networks." HKBU Institutional Repository, 2006. http://repository.hkbu.edu.hk/etd_ra/700.
Full textAfgani, Mostafa Z. "Exploitation of signal information for mobile speed estimation and anomaly detection." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/4890.
Full textKanso, A. "Novel signal processing techniques for pilot-based SSB mobile radio systems." Thesis, University of Bath, 1985. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353395.
Full textPapakonstantinou, Konstantinos. "Les applications du traitement du signal statistique à la localisation mobile." Paris, Télécom ParisTech, 2010. http://www.theses.fr/2010ENST0041.
Full textIn this work we attack the problem of mobile terminal (MT) location estimation in NLoS environments. Traditional localization methods are 2-step processes: In the 1st step a set of location-dependent parameters (LDP) is estimated. In the 2nd step, the MT location is estimated by finding the position that best fits the LDP estimates. For the 1st step we have developed a high-resolution low-complexity LDP estimation algorithm (4D Unitary ESPRIT) for MIMO-OFDM systems, to estimate the angles of arrival (AoA), the angles of departure (AoD), the delays (ToA) and the Doppler shifts (DS) of the multipath components (MPC). As far as the second step of localization is concerned, we developed several hybrid methods applicable to NLoS environments. In the NLoS localization problem, mapping the LDP estimates to the location of the MT is not trivial. To this end, we utilize static and dynamic geometrical channel models (eg. SBM). The 2 great advantages of the SBM-based methods are the identifiability even for cases when LDP estimates are available for only 2 MPC and the remarkable performance for cases when the channel is richer. Due to these great advantages, we consider SBM-based methods to be an appealing solution for the NLoS localization problem. Moreover, we have developed a direct location estimation (DLE) method for MIMO-OFDM systems. In contrast to traditional methods, DLE estimates the MT location directly from the received signal. Its main advantage is the enhanced accuracy at low to medium signal-to-noise ratio (SNR) and/or with small number of data samples, as demonstrated by our results
Hao, Wu, and Zheng Zhibin. "CDMA SATELLITE MOBILE COMMUNICATION SYSTEM MULTI-SIGNAL RECEIVING AND SOFTWARE IMPLEMENTATION." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606499.
Full textThis paper presents one new type CDMA multi-signal receiving protocol, which is suitable for satellite mobile communication systems. Then it gives the principle analysis and describes the realization of this protocol. Meanwhile, it gives the software protocol implementation scheme. From the long point of view, it will more increase the system flexibility, which is easier to update; and will solve the interoperability and integration application problems. Finally, the simulation results conclude that software implementation of CDMA multi-signal receiving in satellite mobile communication system is feasible, and it may be used in other wireless communication systems.
Wong, K.-H. H. "Transmission of channel coded speech and data over mobile radio channels." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235340.
Full textYim, Wan Hung. "All-digital multicarrier demodulators for on-board processing satellites in mobile communication systems." Thesis, University of Surrey, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290415.
Full textBrooks, Duncan John. "Adaptive algorithms for low complexity equalizers in mobile communications." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312445.
Full textBanh, Dennis V. "A ring model for local mobile radio communications with variable packet length." Thesis, Monterey, California: Naval Postgraduate School, 1990. http://hdl.handle.net/10945/27549.
Full textThis thesis presents an analysis of the performance of a local mobile radio communications system utilizing the Aloha random access protocol with variable length packets. The capture phenomenon due to the nearfar effect that enhances the performance of the system is investigated. A tagged packet will capture the base station if its signal-to-interference ratio exceeds a threshold gamma sub zero. Because of the nearfar effect, users near the base station typically have a stronger signal than those farther away. A multiple ring model is used to alleviate this problem. Users in one ring employ different retransmission strategy from those in other rings. A shorter retransmission delay is allocated to users in rings farther from the base station than those closer to the base station in order to achieve approximately the same average delay throughout the network regardless of location.
Khokhar, Khawar Siddique. "Design and development of mobile channel simulators using digital signal processing techniques." Thesis, Durham University, 2006. http://etheses.dur.ac.uk/2948/.
Full textMaidana, Renan Guedes. "Outdoor localization system for mobile robots based on radio-frequency signal strength." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2018. http://tede2.pucrs.br/tede2/handle/tede/8140.
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Na ?rea da Rob?tica M?vel, o problema da localiza??o ? definido como a determina??o da posi??o e orienta??o de um rob? em um espa?o tri-dimensional atrav?s de informa??es de seus sensores. A solu??o mais comum para esse problema ? utilizar um receptor de GPS (doingl?s, Global Positioning System), que reporta posi??o absoluta com rela??o a um sistema de coordenadas fixo e centralizado na Terra. Por?m, o sinal de GPS ? muito afetado por condi??es ambientais e oclus?o de linha de vis?o, por vezes fornecendo estimativas de posi??o de baixa qualidade, se houverem .Com inspira??o nestes problemas, este projeto prop?e um sistema de localiza??o para ser usado por um rob? terrestre em um ambiente externo n?o-controlado, onde h? indisponibilidade de GPS ou que suas medidas s?o de baixa qualidade. Tendo em vista que sensores de baixo custo apresentam medi??es imprecisas devido a fatores ambientais (e.g. terreno acidentado), ? proposta a utiliza??o de pares receptor-transmissor de R?dio-Frequ?ncia, onde a medida do Indicador de Pot?ncia de Sinal Recebido ? usada para estimar as dist?ncias entre receptor e trans- missor, que s?o por sua vez usadas para posicionamento. Essa medida possuia vantagem de ser independente da ilumina??o do ambiente e do estado do terreno, que afetam outros m?todos de localiza??o como Odometria Visual ou por rodas. Um erro m?dio de posiciona- mento de 0.41m foi alcan?ado atrav?s da fus?o de odometria por rodas, velocidade angular de um girosc?pio e pot?ncia de sinal recebido, em um algoritmo de Filtro de Kalman Esten- dido Aumentado, comum a melhoria de 82.66% referente ao erro m?dio de 2.38 m obtido com um sensor GPS comum.
In the field of Mobile Robotics, the localization problem consists on determining a robot?s position and orientation in a three-dimensional space through sensor information. The most common solution to this problem is to employ a Global Positioning System receiver, also known as GPS, which reports absolute position in relation to an Earth-centered fixed coordinate system. However, GPS signals are greatly affected by atmospheric conditions and line-of-sight occlusion, sometimes providing very poor position estimates, if any at all. Inspired by these problems, this project proposes a localization system to be used by a robot in an uncontrolled outdoor environment, where GPS measurements are poor or unavailable. As common sensors provide inaccurate position estimates due to environmental factors (e.g. rough terrain), we propose the use of Radio-Frequency receiver-transmitter pairs, in which the Received Signal Strength Indicator is used for estimating the distances between receiver and transmitter, which in turn are used for positioning. This measurement has the advantage of being independent from lighting conditions or the state of the terrain, factors which affect other localization methods such as visual or wheel odometry. A mean positioning error of 0.41 m was achieved by fusing wheel odometry, angular velocity from a gyroscope and the received signal strength, in an Augmented Extended Kalman Filter algorithm, with an improvement of 82.66% relative to the mean error of 2.38 m obtained with a common GPS sensor.
Yamashita, Fumihiro. "Study on digital signal processing techniques for high-scalable mobile satellite communications." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/143957.
Full textFouladpouri, S. A. A. "An investigation of computerised prediction models for mobile radio propagation over irregular terrain." Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233872.
Full textBarzaj, Yasmin. "Conception d'une architecture hybride pour l'instrumentation et l'étude du comportement des 2RM." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS119.
Full textIn this thesis, we propose a new technic to identify a hybrid system for Data Acquisition,by using ad-hoc sensors on the vehicle, the sensors in the recent smartphones, MBED and CAN-BUS. The assumption is that the Smartphone's sensors will reduce the complexity and the high cost of these instrumentations. The objective is obtaining acceptable measurement accuracy of the collected trajectories and enable for a large-scale deployment of the system's instrumentation, such as a helpful system in the domain of transport. Weshow in this thesis how to build a hybrid system by depending on the properties of the used sensors in both the smartphones and in the vehicles to identify several situation like a failure sensor, accident situation and Rider's behaviour. This system is tested and evaluated on several real time on line - off- line including the used mode and method
Hammerschmidt, Joachim S. "Adaptive space and space-time signal processing for high-rate mobile data receivers /." Düsseldorf : VDI-Verl, 2001. http://www.gbv.de/dms/bs/toc/329240056.pdf.
Full textFrappé, Antoine. "All-digital RF signal generation using delta-sigma modulation for mobile communication terminals." Lille 1, 2007. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2007/50376-2007-Frappe.pdf.
Full textShekaramiz, Mohammad. "Sparse Signal Recovery Based on Compressive Sensing and Exploration Using Multiple Mobile Sensors." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7384.
Full textGuo, Yan. "Perception multimodale pour un robot mobile en milieu marin." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://tel.archives-ouvertes.fr/tel-00637552.
Full textKasebzadeh, Parinaz. "Parameter Estimation for Mobile Positioning Applications." Licentiate thesis, Linköpings universitet, Reglerteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-141877.
Full textAsjadi, Hosein G. "Real-time implementation of low bit-rate speech coders for satellite land-mobile communication systems." Thesis, University of Surrey, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254950.
Full textCoulton, Paul. "Novel synchronisation and channel estimation techniques using auxiliary decoding information." Thesis, Lancaster University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266675.
Full textPerry, Russell. "Low complexity adaptive equalisation for wireless applications." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389138.
Full textСалюк, Руслан Віталійович. "Малогабаритний пригнічувач сигналів мобільного зв'язку." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/39459.
Full textThis diploma project is designed for the implementation of a small-sized mobile signal suppressor. The features of this suppressor are simple design and operability both with and without an antenna – at certain distances. The purpose of this work is to develop a small – sized mobile signal suppressor. The suppressor emits a signal in the same frequency range as the device you want to remove. A "white noise" field is created around this suppressor, where signals from other sources are lost. The result of this work is a well-made model of a small-sized mobile signal suppressor.
Данный дипломный проект сделан для реализации малогабаритного подавителя сигналов мобильной связи. Особенности этого подавителя заключаются в простой конструкции и работоспособности как с антенной, так и без нее - на некоторых расстояниях. Цель работы - построение и разработка малогабаритного подавителя сигналов мобильной связи. Придушувач излучают сигнал в том же диапазоне частот, что и устройство, которое вы хотите удалить. Вокруг этого подавителя создается поле "белого шума", в котором теряются сигналы от других источников. Результатом этой работы является совершенная модель малогабаритного подавителя сигналов мобильной связи.
Thomas, Seimon M. "Signal and neutral processing techniques for the interpretation of mobile robot ultrasonic range data." Thesis, Cardiff University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246116.
Full textMoretti, Daniela. "Exposure of neuronal networks to GSM mobile phone signals." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00949371.
Full textZhou, Junyang. "Enhanced signal propagation models and algorithm selector for providing location estimation services within cellular radio networks." HKBU Institutional Repository, 2007. http://repository.hkbu.edu.hk/etd_ra/776.
Full textSingh, Kuldeep. "An Investigation of Spam Filter Optimaltiy : based on Signal Detection Theory." Thesis, Norwegian University of Science and Technology, Department of Telematics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9960.
Full textUnsolicited bulk email, commonly known as spam, represents a significant problem on the Internet. The seriousness of the situation is reflected by the fact that approximately 97% of the total e-mail traffic currently (2009) is spam. To fight this problem, various anti-spam methods have been proposed and are implemented to filter out spam before it gets delivered to recipients, but none of these methods are entirely satisfactory. This thesis analyzes the properties of spam filters from the viewpoint of Signal Detection Theory (SDT). The Bayesian approach of Signal Detection Theory provides a basis for determining the tuning of spam filters from the particular user's point of view and helps in determining the utility which the spam filter provides to the user.
Campbell, Matthew C. "Design of a Mobile Transceiver for Precision Indoor Location." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-theses/1116.
Full textGerzaguet, Robin. "Méthodes de traitement numérique du signal pour l'annulation d'auto-interférences dans un terminal mobile." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENT014/document.
Full textRadio frequency transceivers are now massively multi-standards, which meansthat several communication standards can cohabit in the same environment. As a consequence,analog components have to face critical design constraints to match the differentstandards requirements and self-interferences that are directly introduced by the architectureitself are more and more present and detrimental. This work exploits the dirty RFparadigm : we accept the signal to be polluted by self-interferences and we develop digitalsignal processing algorithms to mitigate those aforementioned pollutions and improve signalquality. We study here different self-interferences and propose baseband models anddigital adaptive algorithms for which we derive closed form formulae of both transientand asymptotic performance. We also propose an original adaptive step-size overlay toimprove transient performance of our method. We finally validate our approach on a systemon chip dedicated to cellular communications and on a software defined radio
Schölling, Björn. "Binaural signal processing for source localization and noise reduction with applications to mobile robotics." Münster Verl.-Haus Monsenstein und Vannerdat, 2009. http://d-nb.info/994281242/04.
Full textGONCALVES, JULIANA VALIM OLIVER. "SIGNAL VARIABILITY, COHERENCE BANDWIDTH AND DELAY SPREAD ON MOBILE RADIO PROPAGATION ENVIRONMENT AT 3.5GHZ." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=15393@1.
Full textCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Nesta dissertação, é apresentado estudo realizado sobre a variabilidade do sinal, da banda de coerência e do espalhamento de retardos em um ambiente de rádio propagação móvel, por meio de medição em campo de um sinal WiMAX propagado ao longo do canal rádio móvel. A análise da estatística do sinal capturado é comparada com valores teóricos. O sinal WiMAX utilizado possui a tecnologia OFDM-256, como base da sua camada física, e frequência central de 3,410 GHz. A partir dos dados coletados durante as medições, são realizadas as análises da variabilidade do sinal, taxa de cruzamento de nível, tempo médio de desvanecimento, verificada a banda de coerência do canal e calculado o espalhamento de retardos (delay spread), por meio de fórmulas teóricas, em ambientes de LOS e NLOS. O nível do sinal medido é apresentado na forma de distribuição de probabilidade cumulativa, comparado com as distribuições cumulativas teóricas Rayleigh e m-Nakagami, sendo possível verificar a satisfatória adaptação dos dados às distribuições teóricas. São apresentados gráficos com a informação de taxa de cruzamento de nível e tempo médio de desvanecimento de determinadas subportadoras do sinal capturado, bem como os valores teóricos dos parâmetros supracitados, de acordo com as distribuições Rayleigh e m-Nakagami. Novamente, é possível verificar a satisfatória adaptação entre as informações teóricas e os dados medidos em campo. Por fim, é realizada a correlação entre as subportadoras, com o intuito de averiguar a banda de coerência definida, neste trabalho, para um valor de correlação igual a 0,5. De posse dessa informação, o cálculo do parâmetro de espalhamento de retardos é realizado, com base em fórmulas presentes na literatura.
This work presents a study of signal variability, coherence bandwidth and delay spread of a WiMAX signal transmitted through a mobile radio propagation environment. The statistical analysis of the received signal is compared with theoretical distributions. The transmitted WiMAX signal has its physical layer based on OFDM-256 and 3.4 GHz as central frequency. Based on the signal received during the measurements campaign some analysis are done: signal variability; level crossing rate; average fade duration; coherence bandwidth; and delay spread calculation, based on theoretical formulas, in LOS and NLOS environment. The received signal amplitude is plotted as a function of the cumulative probability and compared to the theoretical Rayleigh and m-Nakagami cumulative distributions. It’s possible to notice a good characterization of the measured data based on those two distributions. Some graphs show the level crossing rate and average fade duration of a specific subcarrier of the received signal. In the same graphs are also plotted the theoretical values of Nakagami-m and Rayleigh distributions for those two parameters and we are able to see the good agreement. The correlation between subcarriers is also calculated in order to find out the correlation bandwidth for a correlation of 0.5. Once that the correlation bandwidth is known, the delay spread is calculated based on theoretical formulas.
Flutura, Simon [Verfasser], and Elisabeth [Akademischer Betreuer] André. "Mobile social signal interpretation in the wild for wellbeing / Simon Flutura ; Betreuer: Elisabeth André." Augsburg : Universität Augsburg, 2021. http://d-nb.info/1241474370/34.
Full textSlobodník, Šimon. "Porovnání mapy pokrytí mobilního operátora s reálným pokrytím prostřednictvím GIS." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226597.
Full textNg, Matthew James. "Corridor Navigation for Monocular Vision Mobile Robots." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1856.
Full textGao, Minqi. "Learning mobile robot control for obstacle avoidance based on motion energy neurons /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?ECED%202009%20GAO.
Full textTerry, John D. "Blind adaptive array techniques for mobile satellite communications." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/13425.
Full textAit, Aider Omar. "Localisation référencée modèle d'un robot mobile d'intérieur." Phd thesis, Université d'Evry-Val d'Essonne, 2002. http://tel.archives-ouvertes.fr/tel-00682235.
Full textMartin, Cristoff. "Mobile Satellite Broadcast and Multichannel Communications : analysis and design." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177.
Full textBalkorkian, Sevag, and Zhang Hao. "Analysis of Internal RF Interferences in Mobile." Thesis, KTH, Microelectronics and Information Technology, IMIT, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3909.
Full textNowadays, mobile phones have greater functionality; a camera, color LCD screen, wireless LAN, Bluetooth, IrDA and others. In the near future wider variety of new functionalities will be added, from high quality voice, high definition video to high data rate wireless channels. As consumer electronics integrate greater functionality and high operating frequencies, their emissions will exceed the specified limits, most of these emissions will be a result of the internal interferences in the mobile phone. Moreover higher operating frequencies will be required to improve the quality of these functionalities, something that will make it more difficult to control these interferences. Internal or external sources of electromagnetic interference can degrade the performance of sensitive analog/digital circuits inside the mobile phone. Moreover the electronic device must satisfy a host of global regulations that limit it’s susceptibility to these interferences, as well as the interference emitted by the device itself.
Therefore designing a new electronic device to perform new and exciting functions will not be a pleasant task if it can not meet certain specifications and function as required to adhere to certain global regulations.
This thesis project investigates the sources of interference inside a mobile phone; mainly the electromagnetic interferences and its effect on the radio transceiver focusing on the GSM receiver sensitivity. This report is a result of intensive research, an investigation of possible sources of interference, also actual measurements were performed; RSSI, OTA and sniffing measurements; to identify the physical sources of interferences, and their effect on the receiver sensitivity. Finally solutions were recommended and implemented to suppress the interferences due to different sources, mainly through filtering, shielding or proper grounding of signals and components/subsystems in the mobile phone.
Frank, Florian. "Hybrid analogue & digital access network architectures for the mobile/fixe infrastructure convergence." Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00665650.
Full textAhmed, Rana [Verfasser], and Joachim [Akademischer Betreuer] Speidel. "Equalization and blind signal combining algorithms for mobile television broadcast reception / Rana Ahmed ; Betreuer: Joachim Speidel." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2016. http://d-nb.info/1118507460/34.
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