Дисертації з теми "LTV system"
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Benner, Peter, and Sabine Hein. "Model predictive control based on an LQG design for time-varying linearizations." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000221.
Повний текст джерелаABDALLA, TALAL ALMUTAZ ALMANSI. "Recursive Algorithms for Set-Membership Estimation." Doctoral thesis, Politecnico di Torino, 2022. https://hdl.handle.net/11583/2972788.
Повний текст джерелаSereni, Bruno. "Static output feedback control for LPV and uncertain LTI systems /." Ilha Solteira, 2019. http://hdl.handle.net/11449/180732.
Повний текст джерелаResumo: Este trabalho aborda o controle via realimentação estática de saída aplicado à sistemas lineares com parâmetro variante (LPV) e lineares incertos invariantes no tempo (LIT). O projeto de ganhos de realimentação estática de saída apresentado neste trabalho é baseado no método dos dois estágios, o qual consiste em primeiramente obter um ganho de realimentação de estados, e então, utilizar esta informação no segundo estágio para obter-se o ganho de realimentação estática de saída desejado. As soluções para os problemas investigados são apresentadas na forma de desigualdades matriciais lineares (no inglês, linear matrix inequalities, LMIs), obtidas por meio da aplicação do Lema de Finsler. Baseado em resultados anteriores encontrados na literatura, este trabalho propõe uma estratégia de relaxação de forma a obter um método menos conservador para obtenção de ganhos robustos de realimentação estática de saída para sistemas incertos LTI. Na estratégia proposta, as variáveis adicionais do Lema de Finsler são consideradas como dependentes de parâmetro, juntamente com o uso de funções de Lyapunov dependentes de parâmetro (no inglês, parameter-dependent Lyapunov functions, PDLFs). É apresentado um estudo avaliando a eficácia da estratégia proposta em fornecer uma maior região de factibilidade para um dado problema. Os resultados foram utilizados em uma comparação com um método de relaxação baseado apenas no uso de PDLFs. Uma segunda contribuição deste trabalho consiste na proposta de um... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The static output feedback (SOF) control applied to linear parameter-varying (LPV) and uncertain linear time-invariant (LTI) systems are addressed in this work. The approach chosen for the design of SOF gains is based on the two-stage method, which consists in obtaining a state feedback gain at first, and then using that information for deriving the desired SOF gain at the second stage. The solutions for the investigated problems are presented in terms of linear matrix inequalities (LMIs), obtained by means of the application of the Finsler's Lemma. Based on previous papers found in literature, this work proposes a relaxation strategy in order to achieve a less conservative method for obtaining robust SOF gains for uncertain LTI systems. In the proposed strategy, the Finsler's Lemma additional variables are considered to be parameter-dependent along with the use of parameter-dependent Lyapunov functions (PDLFs). A study evaluating the effectiveness of the proposed strategy in providing a larger feasibility region for a given problem is presented. The results were used in a comparison with a relaxation method based only on PDLFs. Another contribution of this work lies in the proposal of a solution for the control of LPV systems via the design of a gain-scheduled SOF controller. The methods proposed for both control problems were applied on the design of controllers for an active suspension system. In the experiments, it was assumed that only one of its four system's states wer... (Complete abstract click electronic access below)
Mestre
Kounek, Milan. "Model fyzické vrstvy systému LTE." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220269.
Повний текст джерелаHolmberg, Mattias, and Stefan Hen. "LTA kontra självfall : Ett långsiktigt perspektiv." Thesis, KTH, Byggteknik och design, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-127665.
Повний текст джерелаThe purpose of this report is to make a comparison between the two currently used sewage solutions, PSS (Pressure Sewage System) and the more conventional gravity based sewage-system during a vast period of time. Aspects such as investment, maintenance, upkeep, environmental, technology and terrain have been analyzed. The research has resulted in this report and an Excel-program which calculates an estimated economical difference between the two solutions, in a specific case chosen by the user, to determine which is more economically beneficial. This program, used hand in hand with the report, is suppose to increase the knowledgebase regarding the subject of sewage solutions among officials working with these kinds of matters in Sweden.
Ellenbeck, Jan [Verfasser]. "Radio Resource Management and System Spectral Efficiency in LTE Multi-Cell Systems / Jan Ellenbeck." München : Verlag Dr. Hut, 2015. http://d-nb.info/1076437621/34.
Повний текст джерелаOhera, Vlastimil. "Vysokorychlostní mobilní systém LTE." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218045.
Повний текст джерелаKrasowski, Piotr, and Douglas Troha. "Wireless system design : NB-IoT downlink simulator." Thesis, Uppsala universitet, Signaler och System, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-317877.
Повний текст джерелаPraveen, Vunnam. "Maximizing LTE performance with MIMO Systems." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-58272.
Повний текст джерелаAl-Dulaimi, Anwer. "Cognitive radio systems in LTE networks." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/11544.
Повний текст джерелаAbdulhameed, Abbas Abdulazeez. "Combining SysML and SystemC to Simulate and Verify Complex Systems." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2045/document.
Повний текст джерелаHeterogeneous Systems are complex and become very critical. These systems integrate software andhardware components with intensive interaction between them. In this context, there is a strongnecessity to develop methodologies and techniques to specify and validate these systems.In engineering, the requirements are the expression of needs on what a particular product or a serviceshould be or to make. They are used most of the time in a formal sense in the systems engineering.In this kind of systems, several types of requirements are present: non-functional requirements suchas the performance and the reliability and functional requirements such as the liveliness. To validatethese requirements of a system, an environment to simulate and to check the properties is essential.In our work, we propose a methodology based on SysML combined with SystemC and Promela/SPINto specify and validate complex systems. This approach is based on Model Driven Engineeringtechniques to irstly translate SysML models to systemC with the aim of simulation and to mapSysML behavioral diagrams to Promela/SPIN in order to verify temporal properties extracted fromthe requirements. The approach is experimented on case studies to demonstrate its feasibility
Hu, Yiran. "Identification and State Estimation for Linear Parameter Varying Systems with Application to Battery Management System Design." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281368350.
Повний текст джерелаLi, Xinyun. "LTE uplink scheduling in multi-core systems." Thesis, KTH, Kommunikationsnät, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99190.
Повний текст джерелаLi, Wei. "Performance enhancement for LTE and beyond systems." Thesis, University of Bedfordshire, 2014. http://hdl.handle.net/10547/576455.
Повний текст джерелаBawab, Hiba. "Power allocation in overlaid DVB-LTE systems." Thesis, Rennes, INSA, 2015. http://www.theses.fr/2015ISAR0038/document.
Повний текст джерелаSince the launch of the first numerical mobile telecommunications networks in the nineties, the quantity of the transmitted data over the networks is increasing year by year. Advanced user equipments enable to implement more and more bandwidth consuming services such as mobile T and multimedia internet, available in the integreted mobile broadcast mode recently standardized by the 3GPP group. In the meanwhile, the digital vide broadcasting - next generation handled (DVB-NGH) has been released in order to satisfy the increasing demand for mobile TV. These technologies compete for a more and more constrained spectral resource leading to question the possibility to deploy DVB and Long Term Evolution (LTE) service in a spectral overlay mode as it has been investigated by the Ml project funded by the National Research Agency. In this context, this thesis aims at studying the spectral convergence between DVB and LTE networks by deploying a small LTE cell in a large DVB cell. Both technologies present some similarities, i.e. both use orthogonal frequency division multiplexing (OFDM) waveform (in downlink for LTE), but technical characteristics remain rather different between those. In this work, we deal with achievable performance when DVB and LTE spectrally overlap without cooperation. The considered problem being analog to the Seconda1y User (SU) - Primary User (PU) coexistence in overlay scenario, the SU ergodic capacity under average power generated on PU and peak power at SU constaints is investigated. An analytic solution is proposed in X-Channel with Rayleigh fading. In a second time, SU and PU are considered to be LTE and DVB respectively with their particular OFDM signal characteristics. With a first model of overlapping subcarriers, LTE and DVB ergodic capacities and global capacity as well are derived in closed form allowing to study the influence of several system parameters on ergodic capacities. The global capacity is then optimized using a convex-concave procedure leading to the minimum on the global capacity but to balanced capacity on individual links. On a second hand, global capacity maximization leads to favor one system over the other. Last but not least, a careful study of the interference caused by one system over the other by partial overlay is led. The effect of spectral overlap ratio between DVB and LTE systems over the global spectral efficiency is investigated. Advanced interference rejection ability is then assumed at receivers and the optimal spectral overlap, i.e. maximizing the global capacity, is then derived in that case. The different contributions in this work give a theoretical approach on the power allocation modality of two coexisting DVB and LTE systems and on the appropriate spectral overlap ratio between their respective spectrums. This study can be useful for operators interested in dense network deployment scenarios to decide the operating point of allocated resources in a very aggressive frequency reuse pattern
Defibaugh, June, and Norman Anderson. "National Guard Data Relay and the LAV Sensor System." International Foundation for Telemetering, 1996. http://hdl.handle.net/10150/611416.
Повний текст джерелаThe Defense Evaluation Support Activity (DESA) is an independent Office of the Secretary of Defense (OSD) activity that provides tailored evaluation support to government organizations. DESA provides quick-response support capabilities and performs activities ranging from studies to large-scale field activities that include deployment, instrumentation, site setup, event execution, analysis and report writing. The National Guard Bureau requested DESA's assistance in the development and field testing of the Light Armored Vehicle (LAV) Sensor Suite (LSS). LSS was integrated by DESA to provide a multi-sensor suite that detects and identifies ground targets on foot or in vehicles with minimal operator workload. The LSS was designed primarily for deployment in high density drug trafficking areas along the northern and southern borders using primarily commercial-off-the-shelf and government-off-the-shelf equipment. Field testing of the system prototype in summer of 1995 indicates that the LSS will provide a significant new data collection and transfer capability to the National Guard in control of illegal drug transfer across the U.S. borders.
Khwandah, Sinan. "System optimisation and radio planning for future LTE-advanced." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/13822.
Повний текст джерелаDias, Pedro António Figueiredo. "Processing techniques with multiple antennas for the LTE system." Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10917.
Повний текст джерелаPerformance, mobilidade e partilha podem ser consideras como as três palavras-chave nas comunicações móveis de hoje em dia. Uma das necessidades fundamentais do ser humano é a partilha de experiencias e informação. Com a evolução ao nível do hardware móvel, a crescente popularidade de smartphones, tablets e outros dispositivos moveis, fez com que a exigência em termos de capacidade e taxa de transferência por parte das redes móveis não parasse de crescer. As limitações das redes 3G fizeram com que não conseguissem corresponder a tais exigências e como tal, a transição para uma tecnologia mais robusta e eficiente passou a ser inevitável. A resposta escolhida como solução a longo prazo é a rede designada por LTE, desenvolvida pela organização 3GPP é assumido que será a rede de telecomunicações predominante no futuro. As vantagens mais sonantes são, naturalmente, elevadas taxas de transmissão, maior eficiência espectral, redução da latência e de custos de operação. As principais tecnologias em que o LTE se baseia, são o OFDM e sua variante para múltiplo acesso, OFDMA, usado para o downlink e o SC-FDMA para o uplink. Além disso, usa sistemas com múltiplas antenas para impulsionar a eficiência espectral. Apesar de já implementado em alguns países por diversas operadoras, constantes pesquisas continuam a ser realizadas com o intuito de melhorar a sua performance. Nesta dissertação é proposto um esquema duplo de codificação na frequência e no espaço (D-SFBC) para um cenário baseado em OFDM com 4 antenas de transmissão e duas antenas de recepção (4 × 2 D-SFBC) para o downlink. No cenário considerado, 4 símbolos de dados são transmitidos utilizando unicamente 2 sub-portadoras, fazendo com que, este sistema seja limitado pela interferência. Para de forma eficiente descodificar os símbolos de dados transmitidos, foi desenvolvido um equalizador iterativo no domínio da frequência. Duas abordagens são consideradas: cancelamento da interferência em paralelo (PIC) e sucessivo cancelamento de interferência (SIC). Uma vez que apenas 2 sub-portadoras são usadas para transmitir quatro símbolos de dados em paralelo, o esquema desenvolvido duplica a taxa de dados quando comparado com o esquema 2 × 2 SFBC, especificado no standard do LTE. Os esquemas desenvolvidos foram avaliados sob as especificações para LTE e usando codificação de canal. Os resultados mostram que os esquemas implementados neste trabalho utilizando um equalizador iterativo supera os convencionais equalizadores lineares na eliminação da interferência adicional introduzida, em apenas 2 ou 3 iterações.
Performance, mobility and sharing can be assumed as the three keywords in the mobile communications nowadays. One of the fundamental needs of human beings is to share experiences and information. With the evolution of mobile hardware level, the growing popularity of smartphones, tablets and other mobile devices, has made that the demand in terms of capacity and throughput by mobile networks did not stop growing. Thus, the limitations of 3G stops it of being the answer of such demand, and a transition to a powerful technology has become unavoidable. The answer chosen is LTE, developed by the 3GPP organization is assumed to be the predominant telecommunications network in the future. The most relevant advantages are high transmission rates, higher spectral efficiency, reducing latency and operating costs. The key technologies in which LTE is based, are OFDM and its variant schemes for multiple access, OFDMA, used for downlink, and SC-FDMA for the uplink. It also uses multiple antennas systems in order to improve spectral efficiency. Although already implemented in some countries by several operators, continuous research is conducted in order to improve their performance. In this dissertation it is proposed a double space-frequency block coding (D-SFBC) scheme for an OFDM based scenario with 4 transmit antennas and 2 receive antennas (4×2 D-SFBC) for the downlink. In the considered scenario, 4 data symbols are transmitted by using only 2 subcarriers and thus the system is interference limited. To efficiently decode the transmitted data symbols an iterative equalizer designed in frequency domain is developed. Two approaches are considered: parallel interference cancellation (PIC) and successive interference cancellation (SIC). Since only 2 subcarriers are used to transmit 4 data symbols in parallel the developed scheme achieve the double data rate when compared with the 2×2 SFBC, specified in the LTE standard. The developed schemes were evaluated under the main LTE specifications and using channel coding. The results have show that the schemes implemented in this work using an interactive equalizer outperforms the conventional linear equalizers in the interference removal, just by using 2 or 3 iterations.
Lehtisalo, V. (Ville). "Average power tracking optimization system for LTE power amplifiers." Master's thesis, University of Oulu, 2014. http://jultika.oulu.fi/Record/nbnfioulu-201409171871.
Повний текст джерелаLanglais, Valentin. "Contrôle de l'activité des récepteurs NMDA par la D-sérine : rôle des récepteurs astrocytaires EphB3 et CB1." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0211/document.
Повний текст джерелаAstrocytes are key partners of neurons. In the hippocampus, and more particularly at CA3-CA1 synapses, by releasing D-serine, these glial cells regulate the activity of synaptic Nmethyl-D-aspartate (NMDA) receptors and thus synaptic memory, also known as long-term synaptic plasticity. Yet, the synaptic signal inducing D-serine release by astrocytes is still unknown. Based on interesting data from the literature we have investigated the role of the astrocytic receptors for ephrinB3 (EphB3) and endocannabinoids (CB1). To this end we used electrophysiological approaches on acute hippocampal slices of adult mice. In a first study, our data indicate on one hand that the activation of EphB3 receptors increases synaptic D-serine availability and in consequences the activity of synaptic NMDA receptor activity. On the other hand, inhibition of EphB3 receptors induces a decrease of synaptic NMDA receptor activity as well as the induction of the long-term potentiation (LTP; a form of long-term plasticity). Thus, EphB3-ephrinB3 interaction controls LTP induction through the availability of synaptic D-serine. In a second study, we used a transgenic model allowing the inhibition of CB1 receptors expression in astrocytes (GFAP-CB1-KO mice). We discovered that their deletion reduced synaptic D-serine availability. Our work shows that astrocytic CB1 receptors are necessary for LTP induction via this D-serine. All together, this PhD work reveals that astrocytic EphB3 and CB1 receptors regulate synaptic NMDA receptor functions through the control of D-serine availability
Babun, Leonardo. "Extended Coverage for Public Safety and Critical Communications Using Multi-hop and D2D Communications." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/1920.
Повний текст джерелаFuentes, Jose L. S. M. Massachusetts Institute of Technology. "Commercial Aircraft Corporation of China (Comac) attempts to break the Airbus-Boeing duopoly, will it succeed? : an industry analysis framework applied." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/70829.
Повний текст джерелаPage 88 blank. Cataloged from PDF version of thesis.
Includes bibliographical references (p. 82-87).
Using an industry analysis framework, this thesis analyzes whether the recently established Commercial Aircraft Corporation of China (Comac) is likely to break the Boeing-Airbus duopoly in the industry of large commercial airplanes. The selected framework for this thesis is comprised by the following two principles: 1) "The nature and degree of competition in an industry hinge on five forces, one of these being the Threat of New Entrants, which depends on the height of Entry Barriers." (Porter 1979, 1) 2) "In order to cope with the competitive forces in an industry, there are three potentially successful generic strategic approaches to outperforming other firms in the industry: overall cost leadership, differentiation, and focus." (Porter 1980, 35) The results from the barriers of entry analysis suggest that Comac enjoys full unconditional support from the Chinese government as the development of an aerospace industry is deemed as national interest. However, the firm faces a high barrier of entry derived from the advantages the incumbent companies have in terms of their learning and experience curves, which allow them to effectively conduct research and development and innovate. In the long run, as the companies seek sustained competitive advantage (Porter 1984, 34), I find that Comac will mainly rely on generic strategy 'cost', while the incumbents counteract by adopting mainly generic strategy 'differentiation' and 'focus'. This thesis claims the chances of success for Comac largely depend not only on finding the right strategy for a proper balance between 'cost' and 'differentiation', but mainly on the Chinese government being able to maintain protectionist policies in place. In other words, the Chinese government must continue to decide for the domestic airlines what airplanes they should buy. This conclusion is reached by analyzing the history of all previous attempts by China to develop a national jet-which have all been unsuccessful- and the recent history of high-tech industries where China represented the world's largest market and there was a national interest for technology transfer.
by Jose L. Fuentes.
S.M.in Engineering and Management
Veloso, de Aguiar Guilherme, and Mark Anderson Woolard. "Estimating carbon emissions from less-than-truckload (LTL) shipments." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92121.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 86-88).
Less-than-truckload (LTL) is a $32-billion sector of the trucking industry that focuses on moving smaller shipments, typically with weights between 100 and 10,000 pounds, that do not require a full trailer to be moved. Currently, there are no widely accepted methods to estimate carbon emissions from LTL shipments which take into account all the complexities of a typical LTL network. This thesis seeks to address this issue by suggesting a methodology that allows different parties to estimate the emissions of individual LTL shipments with minimal input information. Throughout this research, we worked with C. H. Robinson, a Third-Party Logistics Provider (3PL), and Estes Express Lines, a privately-owned freight transportation company, and analyzed more than 1.5 million shipments. We developed two calculation tools: a detailed model, specifically designed for and based on Estes Express' network and operations, and a lower-precision generic model, adapted from the detailed one so that it could be applied to carriers whose network characteristics are unknown. We also assessed current estimation methods and found that they tend to underestimate the emissions from LTL shipments primarily because (1) they rely on direct over-the-road distances as opposed to actual shipped distances, which must include the intermediate stops, and (2) they fail to factor in the pick-up and delivery (P&D) sections, focusing solely on line haul operations. Therefore, while existing initiatives such as the GHG Protocol and the EPA SmartWay program provide guidance on how to estimate carbon emissions from transportation in general, the LTL industry still needs a specific approach that takes into account all of its unique characteristics. This thesis provides a contribution in that direction by suggesting a methodology to better estimate the carbon emissions of individual LTL shipments.
by Guilherme Veloso de Aguiar and Mark Anderson Woolard.
M. Eng. in Logistics
Machinek, Marian. ""Das Gesetz des Lebens ?" : die Auslegung der Bergpredigt bei L. N. Tolstoj im Kontext seines ethisch-Religiösen Systems /." Sankt-Ottilien : Eos Verlag, 1998. http://catalogue.bnf.fr/ark:/12148/cb39004163r.
Повний текст джерелаZhang, Sina. "Inter-cell Interference Coordination in Indoor LTE Systems." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91849.
Повний текст джерелаAl-Rubaye, Saba. "Radio network management in cognitive LTE-femtocell Systems." Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/11827.
Повний текст джерелаVemuri, Krishna Karthik. "A Multi-User Coordination Scheme for LTE Indoor Positioning System." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1601993204475943.
Повний текст джерелаPandey, Preetanshu. "Application evaluation of a prototype backscatter imaging LDV system (BILS)." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2660.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains xi, 100 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 83-86).
Sparks, Christopher A. "Investigations of neuronal network responses to electrical stimulation in murine spinal cultures." Thesis, University of North Texas, 2001. https://digital.library.unt.edu/ark:/67531/metadc3027/.
Повний текст джерелаDautbegovic, Dino. "Convex Optimization Methods for System Identification." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-34808.
Повний текст джерелаHanzaz, Zakaria [Verfasser]. "Optimization of the Link-to-System Interface for the System Level Evaluation based on the LTE System / Zakaria Hanzaz." München : Verlag Dr. Hut, 2017. http://d-nb.info/1135596824/34.
Повний текст джерелаRai, Anurag. "Analysis and Design Tools for Structured Feedback Systems." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3270.
Повний текст джерелаŠkúci, Michal. "Aktivní tlumení hlavy obráběcího stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230467.
Повний текст джерелаXu, Ziwei. "LTL Motion Planning with Collision Avoidance for A Team of Quadrotors." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-196904.
Повний текст джерелаDragan, Rastovac. "Analiza energetske efikasnosti isporuke multimedijalnih servisa u mobilnim ćelijskim sistemima četvrte generacije (LTE/LTE-A)." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2016. http://www.cris.uns.ac.rs/record.jsf?recordId=101087&source=NDLTD&language=en.
Повний текст джерелаIn this dissertation we develop simple analytical tools for evaluation of average service data rates, bandwidth and energy consumption requirements in dierent eMBMS LTE/LTE-A service congurations. Also, we consider a simple approach to estimate achievable rates and optimally assign the physical layer transmission parameters for eMBMS based video service in the two-tier heterogeneous cellular systems.
DURBHA, SRIRAM. "A METHODOLOGY FOR ANALYZING HARDWARE ACCELERATED CONTINUOUS-TIME METHODS FOR MIXED SIGNAL SIMULATION." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1091060658.
Повний текст джерелаKogiantis, Achilles, Kiran Rege, and Anthony A. Triolo. "LTE SYSTEM ARCHITECTURE FOR COVERAGE AND DOPPLER REDUCTION IN RANGE TELEMETRY." International Foundation for Telemetering, 2017. http://hdl.handle.net/10150/626975.
Повний текст джерелаKalalas, Charalampos. "Enabling LTE for Control System Applications in a Smart Grid Context." Thesis, KTH, Reglerteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-150344.
Повний текст джерела"GNSS-LTE/LTE-A interference mitigation : the adjacent channel rejection ratio approach." Thesis, 2015. http://hdl.handle.net/10210/14525.
Повний текст джерелаThe increase of interest in the development of radio communications, both terrestrial and satellite is reaching far and beyond the most optimistic expectations. There has been an accelerated emergence of newer technologies, all claiming highly coveted radio frequency spectrum resources. With the push for the development of location based services, utilizing satellite com- communications for military purposes and later for civilian use; there has been a parallel development in terrestrial communications technology making it possible to implement cost efficient reliable user systems for voice and data services ...
Yu, Hong-Kai, and 游宏凱. "LEV suspension system design and development." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/00507224970244250818.
Повний текст джерела國立屏東科技大學
車輛工程系所
101
In this study, the vehicle suspension systems design and analysis procedure have been proposed for the Light-weight Electric Vehicles. The contents including the static load analysis, kinematic analysis, mechanical motion and force analysis, component stresses analysis, and vehicle dynamics simulation and test. In the static load analysis, different axle load conditions have been calculated. The loads can be important boundary conditions for the analysis of each component, which can be used to make sure the strength in different force conditions. In the analysis of mechanism, the changes of the suspension parameters improved the performance according to the design procedure. In the vehicle dynamic test and simulations, the kinematic model was compared with the real road test. And different road conditions are came in to find out the critical parameter for avoid the dangerous driving and can be used as judgment parameters for active warring systems.
Wang, Chuan, and 王銓. "MIMO Precoder Selection for 3GPP-LTE/LTE-A Systems." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/79141216008839178147.
Повний текст джерела國立中央大學
電機工程學系
101
Precoder Selection Under MIMO Detection for 3GPP-LTE/LTE-A Systems Abstract Precoding by using a finite-set codebook at transmitters is an effective approach to improve the performance of multiple-input multiple-output (MIMO) systems with reduced feedback overhead. K-Best sphere decoders are popular for high-throughput spatially-multiplexed MIMO signal detection at receivers. In this paper, we propose a precoding-matrix-index (PMI) selection criterion suitable for K-best MIMO detectors by minimizing the trace of the upper triangular matrix after QR decomposition (QRD). To further improve the system performance, fully-sorted QRD, per-layer sorted QRD and partially-sorted QRD are also proposed to be incorporated in the minimum-trace PMI selection criterion. Simulation results based on the MIMO codebooks of 3GPP-LTE/LTE-A systems show the improvements of the proposed scheme compared to the non-precoding MIMO schemes and the precoding schemes using the conventional PMI selection criterions. Considering the fading channel in time/frequency domain of LTE system, we propose a group solution, which not only provide much lower computation, but also avoid more degradating. As to the hardware implementation, we use a scalable design of high throughput 8×8 Sorted QRD. It can compute three sets of 4×4 Sorted QRD simultaneously. Various numbers of sorting layers are supported for our proposed precoding criterion.
Zheng, Qian. "Saturation control of LTI systems." 2005. http://www.lib.ncsu.edu/theses/available/etd-09212005-114354/unrestricted/etd.pdf.
Повний текст джерела邱中玓. "Internet Traffic Identification Mechanism in LTE System." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/04318941884578497728.
Повний текст джерела國立交通大學
電信工程研究所
101
Discontinuous reception (DRX) Cycle mechanism is adopted in Long Term Evolution (LTE) system to minimize the power consumption of user equipment (UE). DRX Cycle must be set to suit the Internet traffic to obtain the optimum performance for power saving. If there is no packet to transmit/receive, UE will turn off the transmitter/receiver based on DRX Cycle to reduce the power of UE. In this thesis, we proposed a mechanism to identify Internet traffic in LTE system. First, we adopted Support Vector Machine (SVM) algorithm for traffic classification. Then, we modeled Background traffic with a simplified bursty packet data distribution and defined a value to detect the use of Instant Message traffic. Finally, we proposed a method of calculation to recognize the characteristics of Background traffic and Instant Message traffic. Simulation results show the numerical parameters to represent on-line traffic. With these constantly updating parameters from the packets we captured, we can recognize the situation and characteristics of the traffic we are using. It provides a guideline for DRX researchers.
Tsao, Bo-Jhong, and 曹伯仲. "Cell Search for 3GPP LTE Communication System." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/50232537438347064689.
Повний текст джерела國立中央大學
通訊工程研究所
98
LTE(long term evolution)wireless communication downlink system uses OFDMA. This system uses the primary synchronization signal (P-SCH) and the secondary synchronization signal(S-SCH) for synchronization and cell identities solving problems. However, it is well known that OFDM systems are sensitive to time and frequency synchronization error. Hence we require accurate synchronization techniques. Furthermore, user equipment (UE) operates in a cellular system, and there are 504 cell-ID in LTE, it needs to establish connection as fast as possible with the best serving base station, i.e. to identify the operating sector and cell. The proposed cell search procedure in this paper contains three steps: The first step, using the delay auto-correlation to find frame timing and the primary synchronization signal, and then use this sequence to start estimate the symbol timing and fractional frequency. And in the estimation we use the average method to improve the accuracy of fractional frequency. The second step, we use method of the phase difference between each signal with synchronization to confirm sector and the integer frequency. And the outcome shows that it can effectively withstand the error of channel effect and symbol timing. The third step, confirm cell-ID. The proposed algorithm confirms the sector and cell ID by phase difference, it can resist the channel effect, and it is more stabilize than matched filter.
Liu, Hsiun-Fu, and 劉訓甫. "Relay Assignment Strategy in LTE-Advanced System." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/14127471096161345574.
Повний текст джерела國立臺灣大學
電機工程學研究所
99
There were many works on the research of relay assignment issue. Relay network, in the form of keeping each its own antennas and having a node exploit a relay node’s antennas, is shown to be a promising approach to enhance spatial diversity. Moreover, improving the spatial diversity of transmission could achieve the main purpose of increasing performance in data transmission. In this work, we pay our attention to the multiple-users-multiple-relays relay assignment on LTE-Advanced (4G) , the future communication technology, because relay transmission is an important concept in LTE-Advanced system. We will proposed a strategy called RIMM for assignment of multiple relay nodes (RN) to multiple users (UE): We want to maximize UEsawareness of performance improvement overall system after introducing the relay nodes (RN). Instead of maximizing the aggregate performance, we want to take our main purpose on maximizing the relative improvement of users (UE) overall system, that is a ratio of performance improvement to the corresponding original performance value and achieve the max-min feature simultaneously. By that relay strategy, it will take advantage of increasing the spatial diversity and the performance of transmission to achieve the perspective of improving the inferior users’ (UE) transmission performance. Then we will transform the relay assignment problem with this relay strategy into bipartite matching problem and introduce the Hungarian algorithm to get the optimal solutions.
Li, Chi-Ming, and 李啓銘. "Location Recommendation Algorithm in LTE Communication System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/68s392.
Повний текст джерела國立臺灣師範大學
電機工程學系
105
In this thesis, we propose a user location recommendation algorithm in the Long Term Evolution (LTE) Downlink communication. The proposed location recommendation algorithm is further combined with Modified Largest Weighted Delay First (MLWDF) to improve system performances such as throughput, packet delay and packet loss rate. From the simulation results, we find that the Quality of Services (QoS) including throughput and packet loss rates of Voice over IP (VoIP) and video in LTE Downlink communications can be improved by using the proposed user recommendation algorithm. . Keywords— Long Term Evolution (LTE), Location Recommendation, Resource Allocation, QoS (Quality of Service).
Lin, Chia-wei, and 林家葳. "Study on Channel Estimation and System Implement for LTE MIMO System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/90740301663411257166.
Повний текст джерела國立中山大學
通訊工程研究所
104
Long term evolution (LTE) has become the fourth generation of mobile phone mobile communication technology standards (4G). Orthogonal frequency division multiplexing and MIMO technology has been used in the downlink channel because this technique can serve the huge demand due to the explosive growth of the large number of data sent by users. The system studied in this thesis is based on LTE. To perform the channel estimation, the transmitters send a pre-defined signal called pilot signal and then the channel can be estimated based on the pilot signal. Based on the estimated channel, the data symbols distorted by the propagation channel can be recovered by the channel information. This thesis aims to examine the LTE downlink channel estimation methods including the least squares and the minimum mean square error approaches, and then we compare the performance by mean square error. In addition, signal-to-noise ratio of the system can be estimated precisely based on the estimated channel information. The results of this thesis are implemented in the LTE multi-antenna measurement software radio platform.
Yu, Sheng-Wen, and 余聖文. "Implementation of LTE RF receiver systems." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/39204177357185317374.
Повний текст джерела國立勤益科技大學
電子工程系
102
The trend in wireless technology prevails globally, and new technologies are developed and advanced rapidly. Wireless communication systems have evolved from the use of analog signals to digital signals, and fixed equipment has been developed into portable equipment for users. Thus, people are benefiting from achievements in the surge of wireless equipment development. Smart phones and tablet computers have promoted the use of mobile Internet. According to the development of the global mobile communications market, this study was divided into two sections. In the first section, the evolution of 1G to 4G wireless communications was sequentially examined. Numerous industry analyses and data comparisons were used to explore the 4G wireless communications market and industry structure both domestically (in Taiwan) and globally. Because long-term evolution (LTE) is a mainstream standard of 4G wireless communications, in the second section, radio frequency (RF) front-end circuits that can be applied in LTE systems were proposed. The direct-conversion receiver framework was employed. LT5500 chips developed by Linear Technology were selected for this study. Regarding the circuit design and layout, electromagnetic compatibility (EMC) analysis was conducted. Under 1.35 V operating voltage, the frequency bands of the circuit were recorded as 1.5 G and 2.5 G. The S parameters for the high and low gain modes of low-noise amplifiers (LNAs) and for frequency mixers at 2.5 G RF and 2.22 G local oscillator (LO) frequency bands with 280 MHz intermediate frequency (IF) output were also recorded.
Heidari, Roshanak. "Packet scheduling algorithms in LTE systems." Thesis, 2017. http://hdl.handle.net/10453/123167.
Повний текст джерелаThere has been a huge increase in demand towards improving the Quality of Service (QoS) of wireless services. Long Term Evolution (LTE) is a development of the Third-Generation Partnership Project (3GPP) with the aim to meet the needs of International Telecommunication Union (ITU). Some of its aspects are highlighted as follows: increase in data rate, scalable bandwidth, reduced latency and increase in coverage and capacity that result in better quality of service in communication. LTE employs Orthogonal Frequency Division Multiple Access (OFDMA) to simultaneously deliver multimedia services at a high speed rate. Packet switching is used by LTE to support different media services. To meet the QoS requirements for LTE networks, packet scheduling has been employed. Packet scheduling decides when and how different packets are delivered to the receiver. It is responsible for smart user packet selection to allocate radio resources appropriately. Therefore, packet scheduling should be cleverly designed to achieve QoS that is similar to fixed line services. eNodeB is a node in LTE network which is responsible for radio resource management that involves packet scheduling. There are two main categories of application in multimedia services: RT (Real Time) and NRT (None Real Time) services. RT services are either delay sensitive (e.g. voice over IP), loss sensitive (e.g. Buffered Video) or both (delay &loss sensitive) for example video conferencing. Best effort users are an example of NRT services that do not have exact requisites and have been allocated to spare resources. Reaching higher throughput has sometimes resulted in unfair allocation to users who are located far from the base station or users who suffer from bad channel conditions. Therefore, a sufficient trade-off between throughput and fairness is essential. The scarce bandwidth, fading radio channels and the QoS requirement of the users, makes resource allocation a demanding issue. Different scheduling approaches have been suggested for different service demands described briefly throughout the thesis. Initially, a comprehensive literature review of existing work on the packet scheduling topic has been accomplished in this thesis to realize the characteristics of packet scheduling and the resource allocation for the wireless network. Many packet scheduling algorithms developed to provide satisfactory QoS for multimedia services in downlink LTE systems. Several algorithms considered in this thesis include time and frequency domain algorithms and their way of approach has been investigated. The next objective of this thesis is to improve the performance of packet scheduling in LTE downlink systems. A new packet scheduling algorithm has been introduced in this thesis. A study on VoLTE (Voice over LTE), video streaming and best effort traffic under three different scheduling algorithms has been conducted. Heterogeneous traffic based on precise modelling of packets has been used in the simulation. The main resource allocation and assignment technique used in this work namely Dynamic Subcarrier Allocation scheme is shown to provide a solution to solve the cross layer optimisation problem. It depends on Channel Quality Information (CQI) and has been broadly investigated for single carrier and multicarrier wireless networks. The problem is based on the maximisation of average utility functions. Different scheduling algorithms in this method consider to be utility functions. The throughput, fairness and Packet Loss Ratio have been considered as the requirements for examining the performance of algorithms. Simulation results show that the proposed algorithm significantly increases the performance of streaming and best effort users in terms of PLR and throughput. Fairness has also been improved with less computational complexity compared to previous algorithms that have been introduced in this thesis.
Lee, Tsao-Hsuan, and 李肇軒. "High-Throughput Turbo Decoder Design with New Interconnection Network for LTE/LTE-A System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/87123179754476132422.
Повний текст джерела國立中央大學
電機工程學系
101
In this paper, we design and implement a high-throughput turbo decoder for the 3rd Generation Partnership Project (3GPP) Long Term Evolution-Advanced (LTE-advanced) system. To support the high data rate, we adopts eight radix-4 parallel soft-in/soft-output MAP decoders. We adopt MAP decoding with sliding window mechanism to decrease decoding time. And we also use the warm-up scheme to compensate the performance loss. Besides, The properties of quadratic permutation polynomial (QPP) interleaver are exploited to reduce the complexity of the switch network between memory and MAP decoder. Four techniques are used to improve the hardware design. First, the in-place algorithm is adopted to decrease the size of α-memory in MAP decoder , and hence the overall area can be reduced. Next, the processing periods of the last window in the first half iteration and the first window in the second half iterations are scheduled to be overlapped, Consequently, the decoding time is reduced and the throughput of the turbo decoder can be enhanced. The interconnection network is designed elaborately. A new interconnection network is proposed with a simple rotator and control logic. Using simple conditional judgement with extra multiplexers to exchange the address and memory data, we can support parallel processing of the turbo decoding. In addition, We achieve non-conflict memory access under high parallel and high radix hardware design for 188 modes . From synthesis result, this work can operate at 406 MHz to offer decoding data rate up to 511 Mbps in 90nm CMOS technology.