Дисертації з теми "Allocation schemes"
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Haque, Syed E. "Efficient GTS Allocation Schemes for IEEE 802.15.4." Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/cs_theses/75.
Повний текст джерелаMaldonado, Martin Froilan. "A comparison of file allocation decision-making schemes." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/9148.
Повний текст джерелаVannithamby, Rathneswaran. "Resource allocation schemes for high speed wireless access networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ63644.pdf.
Повний текст джерелаLi, Guangming. "Novel resource allocation schemes in optical burst switching networks." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37051040.
Повний текст джерелаPhuyal, Umesh. "Resource allocation schemes for next generation wireless communication systems." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43711.
Повний текст джерелаLi, Guangming, and 李光明. "Novel resource allocation schemes in optical burst switching networks." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37051040.
Повний текст джерелаLee, Joohee. "CDMA overlapped carrier allocation schemes for cellular mobile communications." Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/844189/.
Повний текст джерелаStemick, Martin. "Contributions to Resource Allocation Schemes in Multiuser OFDM-FDMA-Systems /." Göttingen : Cuvillier, 2009. http://deposit.d-nb.de/cgi-bin/dokserv?id=3415355&prov=M&dok_var=1&dok_ext=htm.
Повний текст джерелаHamayun, Mirza Tariq. "Integral sliding mode fault tolerant control schemes with control allocation." Thesis, University of Leicester, 2013. http://hdl.handle.net/2381/28107.
Повний текст джерелаBocquet, Wladimir. "Computationally Efficient Power Allocation and Equalization Schemes for Multi-Carrier Systems." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/123833.
Повний текст джерелаGrünheid, Rainer. "Adaptive resource allocation schemes in MIMO-OFDM based cellular communication systems /." Göttingen : Cuvillier, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016325665&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Повний текст джерелаDevarajan, Rajiv. "Power allocation schemes for cooperative communication system using weighted sum approach." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/36957.
Повний текст джерелаGrünheid, Rainer. "Adaptive resource allocation schemes in MIMO-OFDM based cellular communication systems." Göttingen Cuvillier, 2006. http://d-nb.info/986383627/04.
Повний текст джерелаKaya, Onur. "Achievable rates, optimal signalling schemes and resource allocation for fading wireless channels." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2948.
Повний текст джерелаThesis research directed by: Electrical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Khreis, Alaa. "Cross-layer optimization of cooperative and coordinative schemes for next generation cellular networks." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLT011/document.
Повний текст джерелаHARQ has become an important research field in the wireless digital communications area during the last years. In this thesis, we improve the HARQ mechanisms in terms of throughput and/or latency which are the bottleneck of next generation wireless communication systems. More precisely, we improve the time-slotted HARQ systems by mimicking NOMA, which means using superposed packets in a single-user context. In the first part of the thesis, we propose HARQ protocols using the help of a relay to improve the transmission rate and reliability. An enhanced HARQ protocol adapted to delayed feedback is proposed in the second part. In this new multi-layer HARQ protocol, additional redundant packets are sent preemptively before receiving the acknowledgement, and in superposition to other HARQ processes
El, Houmaidi Mounire. "RESOURCE ALLOCATION SCHEMES AND PERFORMANCE EVALUATION MODELS FOR WAVELENGTH DIVISION MULTIPLEXED OPTICAL NETWORKS." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4331.
Повний текст джерелаPh.D.
School of Computer Science
Engineering and Computer Science
Computer Science
Musabe, Richard. "Optimizing VoIP in 3G LTE using cross-layered scheduling and resource allocation schemes." Thesis, Glasgow Caledonian University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.601666.
Повний текст джерелаGirici, Tolga. "Resource allocation schemes for OFDMA based wireless systems with quality of service constraints." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7618.
Повний текст джерелаThesis research directed by: Dept. of Electrical and Computer Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Gorantiwar, Sunil Digambar. "A model for the planning and operation of heterogeneous irrigation schemes in semi-arid regions under rotational water supply." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/11706.
Повний текст джерелаGuo, Zhongyong. "Transportation schemes and bandwidth allocation for VBR MPEG-2 video traffic in ATM networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ31579.pdf.
Повний текст джерелаKumar, Akshay. "Efficient Resource Allocation Schemes for Wireless Networks with with Diverse Quality-of-Service Requirements." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/87529.
Повний текст джерелаPHD
He, Zhenfeng. "Efficient radio resource allocation schemes and code optimizations for high speed downlink packet access transmission." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6189.
Повний текст джерелаBishop, Rachel Ann 1957. "Incentive schemes, moral hazard, and risk aversion: Intrafirm resource allocation and determinants of budgetary slack." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/289252.
Повний текст джерелаNguyen, Tien M., Hung H. Nguyen, James Yoh, Dean J. Sklar, and Thomas Eng. "BANDWIDTH EFFICIENT MODULATION SCHEMES FOR FUTURE TT&C APPLICATIONS." International Foundation for Telemetering, 2001. http://hdl.handle.net/10150/607603.
Повний текст джерелаThis paper presents initial results of an investigation on bandwidth efficient waveforms for telemetry, tracking and commands (TT&C). Included in the investigation are waveforms that are currently being considered by the International Consultative Committee for Space Data Systems (CCSDS) and American Institute of Aeronautics and Astronautics (AIAA) for standards, advanced waveforms and others that have the potential to become future standards. The goal of this investigation is to recommend a suite of bandwidth efficient modulation schemes for further investigation. This suite of modulation scheme should be suitable for various TT&C applications with data rates ranging from a few hundreds Bit Per Second (bps) to a few hundreds Mega bps (Mbps). First, the philosophy of waveform evaluation is described. The description includes a list of waveform attributes leading to quantitative and qualitative figures of merit for bandwidth efficient waveforms. Then quantitative results for the two most important waveform attributes (bandwidth efficiency and bit error rate performance) are presented. These results will be used by a follow-on study to significantly reduce the number of candidate waveforms, so that all attributes can be more thoroughly evaluated.
Pöschl, Felix. "The Potential Effects of Market-based Slot Allocation Schemes on Airline Networks in the European Union." Institut für Transportwirtschaft und Logistik, WU Vienna University of Economics and Business, 2006. http://epub.wu.ac.at/410/1/document.pdf.
Повний текст джерелаMathur, Tushar. "STUDY OF SPECTRUM ALLOCATION SCHEMES IN GENERALIZED MULTI PROTOCOL LABEL SWITCHED CONTROL PLANE ENABLED FLEXI GRID NETWORKS." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1438339701.
Повний текст джерелаRuby, Rukhsana. "Uplink scheduling and resource allocation schemes for LTE-advanced systems that incorporate relays or carry heterogeneous traffic." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54776.
Повний текст джерелаApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Muhammad, Usman Rehan. "Probabilistic and Risk Analysis ofChannel Allocation Schemes,based on Markov Chain Model,used for Next Generation Networks." Thesis, KTH, Tillämpad maskinteknik (KTH Södertälje), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-143956.
Повний текст джерелаZabanoot, Zaid Ahmed Said. "Modelling and Analysis of Resource Management Schemes in Wireless Networks. Analytical Models and Performance Evaluation of Handoff Schemes and Resource Re-Allocation in Homogeneous and Heterogeneous Wireless Cellular Networks." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5383.
Повний текст джерелаLongin, Carl Friedrich Horst. "Optimum allocation of test resources and comparison of alternative breeding schemes for hybrid maize breeding with doubled haploids." [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:100-opus-2061.
Повний текст джерелаMontané, Francesc, Andrew M. Fox, Avelino F. Arellano, Natasha MacBean, M. Ross Alexander, Alex Dye, Daniel A. Bishop, et al. "Evaluating the effect of alternative carbon allocation schemes in a land surface model (CLM4.5) on carbon fluxes, pools, and turnover in temperate forests." COPERNICUS GESELLSCHAFT MBH, 2017. http://hdl.handle.net/10150/625988.
Повний текст джерелаi. dynamic C allocation scheme (named "D-CLM4.5") with one dynamic allometric parameter, which allocates C to the stem and leaves to vary in time as a function of annual net primary production (NPP);
ii. an alternative dynamic C allocation scheme (named "D-Litton"), where, similar to (i), C allocation is a dynamic function of annual NPP, but unlike (i) includes two dynamic allometric parameters involving allocation to leaves, stem, and coarse roots;
iii.–iv. a fixed C allocation scheme with two variants, one representative of observations in evergreen (named "F-Evergreen") and the other of observations in deciduous forests (named "F-Deciduous").
D-CLM4.5 generally overestimated gross primary production (GPP) and ecosystem respiration, and underestimated net ecosystem exchange (NEE). In D-CLM4.5, initial aboveground biomass in 1980 was largely overestimated (between 10 527 and 12 897 g C m−2) for deciduous forests, whereas aboveground biomass accumulation through time (between 1980 and 2011) was highly underestimated (between 1222 and 7557 g C m−2) for both evergreen and deciduous sites due to a lower stem turnover rate in the sites than the one used in the model. D-CLM4.5 overestimated LAI in both evergreen and deciduous sites because the leaf C–LAI relationship in the model did not match the observed leaf C–LAI relationship at our sites. Although the four C allocation schemes gave similar results for aggregated C fluxes, they translated to important differences in long-term aboveground biomass accumulation and aboveground NPP. For deciduous forests, D-Litton gave more realistic Cstem ∕ Cleaf ratios and strongly reduced the overestimation of initial aboveground biomass and aboveground NPP for deciduous forests by D-CLM4.5. We identified key structural and parameterization deficits that need refinement to improve the accuracy of LSMs in the near future. These include changing how C is allocated in fixed and dynamic schemes based on data from current forest syntheses and different parameterization of allocation schemes for different forest types.
Our results highlight the utility of using measurements of aboveground biomass to evaluate and constrain the C allocation scheme in LSMs, and suggest that stem turnover is overestimated by CLM4.5 for these AmeriFlux sites. Understanding the controls of turnover will be critical to improving long-term C processes in LSMs.
Richards, J. D. W. "The allocation and effects of special employment measures : The case of the temporary employment subsidy and schemes operated by the Department of Industry." Thesis, University of Kent, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353817.
Повний текст джерелаTeillard, d'Eyry Félix. "Reconciling food production and biodiversity in farmlands : the role of agricultural intensity and its spatial allocation." Phd thesis, Université René Descartes - Paris V, 2012. http://tel.archives-ouvertes.fr/tel-00766882.
Повний текст джерелаBousia, Alexandra. "Design of energy efficient network planning schemes for LTE-based cellular networks." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/386393.
Повний текст джерелаLa rápida expansión de los servicios móviles y de la demanda emergente de aplicaciones multimedia han dado lugar a un impresionante crecimiento del tráfico. Operadores de redes móviles (MNOs) tratará de extender su infraestructura mediante la instalación de más estaciones base (BSs), en un esfuerzo por aumentar la capacidad de la red y satisfacer las apremiantes demandas de tráfico. Además, para cumplir con las exigencias escalada, redes heterogéneas (HetNets), constituyen la nueva tendencia de las redes de próxima generación. La infraestructura implica un aumento en los gastos de capital y tiene un impacto directo en el consumo de energía a la red, lo que resulta en un aumento de los gastos operacionales. La investigación de soluciones de eficiencia energética hará bajar el consumo de energía y el coste de la red. La comunidad científica se ha desplazado hacia la investigación de los sistemas de desactivación de BSs. Estos esquemas proponen que parte de la infraestructura se puede cdesectivarse, cuando el tráfico es bajo, mientras que los BSs activas extender su cobertura al servicio de la red. Esta tesis ofrece contribuciones al campo de la BSs desconexión para las redes y HetNets con uno o multiples MNOs, proponiendo mecanismos que mejoran diferentes aspectos del rendimiento de la red. La desactivación de BS,s la tendencia innovadora de compartir infraestructura y la colaboración impulsada financieramente entre las partes implicadas de las redes actuales y futuras prometen mejoras significativas en términos de ahorro energético y económico. Las principales contribuciones de tesis se dividen en tres partes, que se describen a continuación. La primera parte de la tesis introduce innovadora apagar enfoques en entornos de un solo operador, donde se despliegan sólo macro BSs. Las estrategias propuestas explotan las características de tráfico (por ejemplo, la distribución de los usuarios, el volumen de tráfico, etc.) y las características distintivas de las redes (por ejemplo, la posición BS, topología, etc.). Análisis teórico y simulaciones muestran la mejora del rendimiento ofrecido por las estrategias de conmutación con respecto a la eficiencia energética. La segunda parte de la tesis explora un reto diferente en la planificación de la red. La coexistencia de múltiples operadores en la misma zona geográfica ha motivado un nuevo modelo de negocio, conocida como la compartición de infraestructura. Se propone un esquema de desactivación basada en itinerancia, teniendo en cuenta la racionalidad y los intereses en conflicto de los operadores de redes móviles. Los resultados teóricos y de simulación muestran que nuestra propuesta mejora significativamente la eficiencia energética, garantizando al mismo tiempo el rendimiento en escenarios realistas. Por otra parte, el esquema propuesto proporciona una mayor eficiencia de costes y la equidad en comparación con los algoritmos del estado de la técnica, motivar al mnos de adoptar estrategias de teoría de juegos. La tercera parte de la tesis se centra en la explotación de HetNets y la propuesta de estrategias eficaces de energía y costes en las redes con múltiples operadores. Nos dirigimos efectivamente la participación en los costos, proponiendo modelos de costos precisos para para compartir el costo de la red. Teniendo en cuenta el impacto del tráfico en el coste, proponemos políticas costos compartidos novedosas que proporcionan un resultado justo. En la continuación, los esquemas basados en subastas innovadoras dentro de marco de optimización multiobjetivo se introducen los datos que descargan de la BS. La solución propuesta recoge los intereses en conflicto de los operadores de redes móviles y las compañías de terceros y los resultados obtenidos muestran que el beneficio de proponer la desconexión se acerca para HetNets
Uznanski, Przemyslaw. "Large scale platform : Instantiable models and algorithmic design of communication schemes." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00878837.
Повний текст джерелаSoares, Mariana Flor Eiras. "UK pension funds : fund portfolio performance analysis." Master's thesis, Instituto Superior de Economia e Gestão, 2020. http://hdl.handle.net/10400.5/20707.
Повний текст джерелаNo UK, indivíduos recebem uma pensão após a reforma, ou se falecer sua/seu esposa/o. Esta pode ser oferecida pelo estado, mas um dos casos mais comuns é; as pessoas recebem-na do seu fundo de pensão ocupacional (derivado do seu caminho de trabalho). Este tipo de pensão é fornecido pelo empregador e acumula benefícios que irão gerar o salário do empregado após a reforma. Para financiar as pensões, os empregadores devem criar um portfólio de investimento, que inclui diversos fundos e classes de ativos (alguns que pretendem gerar maiores retornos, assumindo maiores riscos, e outros que pretendem gerar retornos seguros, mas mais baixos). De modo a monitorizar o desempenho destes fundos, com o fim de entender se está a ser feita uma gestão adequada dos mesmos, é necessário ter em conta os seguintes fatores: gestão de risco, alocação dentro das diferentes classes de fundos e seleção de fundos. Para este efeito é utilizado o método de analise de atribuição, que nos diz o valor que foi adicionado ao portfolio proveniente das decisões do gestor. No atual período de pandemia, que afetou os mercados financeiros de forma considerável, o estudo desenvolvido neste projeto, visa perceber qual foi o impacto desta situação em quatro portfolios diferentes, com diferentes estratégias de investimento, e maioritariamente estudar as diferentes posições que foram assumidas pelos diferentes gestores, com o objetivo de manter a estabilidade do desempenho dos portfolios depois da grande queda dos mercados que se deu com o fecho da economia no inicio de 2020.
In the UK, individuals receive a pension after their retirement or their spouse's death. This pension can be provided by the state, but one of the most common cases is that people will receive it from their occupational pension fund (in result of their work path). This type of pension is sponsored by the employer and it accumulates benefits that will generate the income of a person after their retirement. To fund the pensions of the employees, employers need to create investment portfolios, that include different funds and asset classes (some seek higher growth while assuming higher risk, and others seek guaranteed, but lower returns). To monitor the performance of these portfolios and understand if the management is being done efficiently, one needs to take into consideration: risk management, asset allocation and selection decisions. For this effect, we use the attribution analysis method, which tells us the value that has been added to the portfolio by the active management decisions. In a period of pandemic, that affected the financial markets considerably, the study practiced in this project, aims to understand what was the impact of the situation in four different portfolios, with different investment strategies, and mainly to study the different positions that were assumed by the different managers, in order to keep the portfolios stability after the rough market crash that came with the economic shutdown in the beginning of 2020.
info:eu-repo/semantics/publishedVersion
Dong, Xuefeng. "Efficient schemes for channel allocations in mobile cellular networks /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487942739808166.
Повний текст джерелаChingchit, Soontorn. "Design and performance evaluation of a flexible clustering and allocation scheme for parallel processing." Thesis, Curtin University, 1999. http://hdl.handle.net/20.500.11937/240.
Повний текст джерелаXing, Zitong. "A dynamic radio channel allocation scheme for WLANs." Diss., Online access via UMI:, 2005.
Знайти повний текст джерелаWright, Ian Douglas. "A stochastic approach to pension scheme funding and asset allocation." Thesis, Heriot-Watt University, 1997. http://hdl.handle.net/10399/1282.
Повний текст джерелаChang, Cooper, and 張古博. "Resource Allocation Schemes for Cellular Communication Systems." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/70069013623758633946.
Повний текст джерела國立交通大學
電信工程系
87
Designing resource allocation schemes for cellular systems is one of important engineering issues for improving spectrum efficiency, because of tremendous growth of the mobile user population. In this dissertation, we study resource allocation schemes, including hierarchical cellular structure, priority strategies, duplexing scheme, and multiplexing/multiple access mechanism, for cellular communications systems. We first analyze a hierarchical cellular system with priority channel assignment schemes. Hierarchical cellular systems are designed to take the advantages of both microcell and macrocell systems. The effects of queueing schemes for new and handoff calls and guard channel scheme for handoff calls on the system performance are studied. And then, allocation schemes of duplexing scheme and multiplexing/multiple access mechanism are studied. Variable partition duplex scheme, which is designed to take the advantages of the nature of conversation activity, is proposed on packet reservation multiple access (PRMA). Enlarged reservation duration scheme is proposed to improve the PRMA system. Finally, we study the effects of ways to share the communication resource on the performance of CDMA/TDD systems in terms of outage probability and blocking probability. Dynamic and fixed allocated schemes are proposed for CDMA/TDD, and then their system performances are compaired and analyzed. We successfully analyze the above resource allocation schemes and verify the validity of these analyses by simulations. The numerical results show that our proposed resource allocation scuhemes indeed have some improvement on the performance of cellular communication systems.
Haciomeroğlu, Fatih. "On-line measurement-based capacity allocation schemes." 2003. http://www.lib.ncsu.edu/theses/available/etd-03262003-223315/unrestricted/etd.pdf.
Повний текст джерелаCHEN, CHI-CHUNG, and 陳起忠. "Efficient Radio Resource Allocation Schemes in Wireless Networks." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/8wcrns.
Повний текст джерела國防大學理工學院
國防科學研究所
106
As the wireless communications is developing, the numbers of wireless user are also increasing rapidly, the bandwidth of networks is inefficiency. There are many reson of causing the inefficiency channel. Such as the execlusive right of users, channel idle when low traffic load, the numbers of user are increasing, user competed the channel resource, and channel traffic load. In order to improve channel utilization. In this Thesis, we propose two schemes for allocating resourecs in wireless communications. The first scheme is an easy and efficient channel assignment scheme based on the theory of finite projective plane (FPP). Since the bandwidth resources of wireless communications are scarce and limited due to the large number of user requirements. The aim of the proposed scheme is to improve channel utilization. Differing from the conventional assignment by assigning one channel per user, the proposed scheme allocates multiple channels for each user assignment, i.e. each user possesses multiple transmit channels corresponding to the point numbers of a set of FPP. The arrangements of intermixed grouping style of channels based on FPP also provide fairness among users. In the first scheme, the channel assignment schemes are also analyzed and compared with each other through Markov chain modeling. The channel assignment efficiency with our defined effective puncture through ratio is obviously enhanced from simulation results with the proposed FPP scheme, especially when the offered traffic load is light. The secend scheme is a novel grouping slotted aloha scheme. Slotted Aloha (SA) is a conventional distributed contention-based scheme in which the link time is divided into slots of equal duration and the users contend to access by transmitting with a predefined slot-access probability. Due to various applications and developments in wireless communications and networks, SA random access scheme and its various variants have gained renewed interests recently. In thesis, we propose a novel grouping slotted aloha(GSA) scheme with different grouping arrangements and (or) variable transmit probabilities (VTP) to improve throughput performance and achieve fairness among all user nodes. It shows improvements of throughput available with the proposed scheme by simply grouping user nodes and mapping VTPs onto the grouped slot positions for various wireless communications.
Peng, I.-Hsuan, and 彭亦暄. "Study of Effective Resource Allocation Schemes in WDM Networks." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/pmjacx.
Повний текст джерела國立中央大學
通訊工程研究所
96
In this dissertation, we focus on the following WDM network related issues. The first is the wavelength assignment algorithm of multicast traffic; the second is the routing scheme of lightpath with guaranteed protection switching time; and the third is the construction of hierarchical WDM topology. In the first issue, we assume the WDM network to be with sparse wavelength conversion nodes (SWCN) and a systematic approach for the assignment of wavelength in networks is proposed. Based on the MWA-SWC scheme, a multicast tree is divided into groups based on common wavelengths so that the wavelength can be assigned effectively. The simulation results show that the proposed scheme demonstrates much better performance than that of the SCG scheme, in which we extended the original to be applicable for SWCN network. We also found that the performance is not always improved proportionally to the increment of the wavelength conversion nodes. The improvement reaches saturation when the number of conversion nodes is above 35% of the total number of nodes. In order to minimize the influence on transmission quality caused by the failure of link and to provide a definite time for the recovery from the failure in optical network, the protection switching time (PST) should be taken into consideration during path arrangement. The PST-guaranteed scheme, which is based on the concept of short leap shared protection (SLSP), for the arrangement of data paths in WDM network is proposed and studied. The proposed scheme provides an efficient procedure to determine a just-enough PST-guaranteed backup paths for a working path. In addition, the network cost is also considered in a heuristic manner and the simulation results illustrate that the required cost of the selected path in the proposed scheme is competitive with which of the shared path scheme. In the third issue, a systematic approach is proposed to construct the hierarchical topology in a heuristic manner so that the network resource can be effectively utilized. The proposed scheme groups nodes into logical routing area (LRA) by considering the appropriate group size and the degree of each WDM node. Simulation results demonstrate that the performance of the proposed scheme is superior to that of the evenly grouped scheme. The integration of wired backbone and wireless access network is recognized to be the trend of next generation network. In this dissertation, we also survey the possible integration architectures of WiMax and EPON networks to seek for potential research topics as our future works.
Tai, Yu-Fen, and 戴郁芬. "Dynamic Channel Allocation Schemes for IEEE 802.11 Wireless LAN." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/16667501806931282462.
Повний текст джерела國立交通大學
資訊工程系所
93
With the rapid evolution of wireless technology, WLAN gradually becomes a common solution of setting up a local area network. In order to cover the whole building with wireless signals, the network administrators often choose to deploy the access points (APs) densely. On the other hand, under the IEEE 802.11 infrastructure mode, there may be interference between the nearby access points if they use the same channel. Static channel assignment is not good enough because of the limitation of channels and the mobility of users. How to change the channels of access points dynamically to speed up the throughput of the whole network is the main issue that we want to discuss. In this thesis, we propose two centralized schemes to assign the channels of access points dynamically according to the AP utilizations. We also implement one of our schemes and compare the performance of it with other methods by experiments. The experiment result shows that our methods indeed increase the network throughput a lot and achieve better performance than others.
DLAMIN, THEMBELIHLE, and 狄天柏. "Clustering and Resource Allocation Schemes for Hybrid Femtocell Networks." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/27207044722567235666.
Повний текст джерела國立交通大學
電機資訊國際學程
102
為了提升住宅和企業內部環境的服務範圍和服務品質,毫微微型細胞 (femtocells)已被視為一個解決方案,因為它可以提供低功率耗損且讓使用者自行佈署的特性。此外,毫微微型細胞可以被允許與巨細胞網路 (macro network)使用相同的載波頻率或是不同的載波頻率。在一個具有高緻密毫微微型細胞佈署的傳輸環境中,資源配置和干擾管理是一個重要的研究議題,其中干擾主要來自於使用不同的存取模式的毫微微型細胞。若毫微微型細胞運作在封閉存取模式 (closed access mode)指的是只允許擁有子載波使用權的使用者來和毫微微型細胞做連結;而在開放存取模式 (open access mode)指的是所有使用者皆可和毫微微型細胞來做連結。 為了獲得毫微微型細胞在企業內部環境建置的好處,混合式存取模式 (hybrid access mode)可以考慮被系統所採用,該模式可以同時服務封閉式用戶群組 (closed subscriber group)毫微微型細胞內的使用者和非封閉式用戶群組(Non-closed subscriber group)毫微微型細胞內的使用者。此外,當毫微微型細胞運作在混合式存取模式,可以提供封閉和非封閉式使用者間不同的服務層級。 在本論文中,我們考慮毫微微型細胞運作在混合式存取模式,且僅允許非封閉式使用者使用連結的毫微微型細胞的部分限制資源。為了最大化非封閉式用戶群的上鏈傳輸容量,本論文提出了一種集中式的功率配置方式,為非封閉式用戶群使用者進行資源的分配,其中使用了幾何規劃(geometric programming)和一種新穎的次佳化分群策略。此外,我們也考慮非封閉式使用者允入控制條件 (admission control condition) 的限制。本論文還提出一個在賽局理論架構下的分散式功率配置演算法。其中利用了非合作式的賽局(non-cooperative game)理論及其納什均衡 (Nash equilibrium)的收斂特性。本論文針對在非合作式的賽局中,證明純策略(pure strategy)納什均衡的存在。我們所設計的功率配置演算法主要是根據毫微微型細胞與其服務的用戶之間的距離分配上鏈的功率,以最大化效益函數(utility function)。分析結果顯示,我們提出的資源與分群演算法能夠有效地改善系統的整體效能。
Shih, Yung-Chien, and 史永健. "Channel Allocation and Authentication Schemes for Wireless Mesh Networks." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/00940706052586723658.
Повний текст джерела國立交通大學
資訊科學與工程研究所
99
While wireless mesh networks (WMNs) are gaining momentum in widespread application, we are concerned with fast handoff in a secure mesh environment. To this end, we present a means in the context of IEEE 802.11s by allowing a mesh portal to act as an IEEE 802.1X authenticator, to reduce costly IEEE 802.1X authentications during handoff. As the mesh portal (MPP) engages in IEEE 802.1X authentication and cryptographic key management, our scheme maintains an end-to-end secure channel between a mobile station and the MPP wherever the station roams in the network. Therefore, without compromising required robust security, IEEE 802.1X authentication can be bypassed during handoff to reduce overall delay in an approach suggested for moderately sized networks. A WMN suffers from a co-channel interference problem when mesh nodes share the same wireless access channels. Therefore, the overall throughput of WMNs may not be able to increase substantially even with broadband physical layer technologies. The problem also causes unexpected transmission delays in the network, which could seriously influence the process of authentications. As a remedy, we propose an end-to-end channel allocation scheme, extending the radio-frequency-slot method and providing stable throughput for end-to-end packet delivery in WMNs. Although separating transmissions of data and acknowledgment packets on two different channels is not our new finding, we observe that the non-overlapping channels can be efficiently reused if the concept is introduced into our scheme. Moreover, by applying link and path metrics for route selection, the end-to-end throughput and delay can be maintained, and the overall throughput of WMNs can be improved. For fast handoff, a mobile station should be able to detect immediately the changes of a network environment, such that the station can perform handoff process at correct time. To this end, we designed and implemented a middleware platform, providing application programming interfaces (APIs) for upper applications to use cross-layer signaling and event notification mechanisms. The applications can configure and acquire status of underlying protocol stack via the cross-layer signaling mechanism, and can immediately detect changes of a network environment via the event notification mechanism.
Gwo-Ruey, Lee, and 李國瑞. "Performance Evaluation of Subcarrier Allocation Schemes over OFDM Systems." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/51679276737263993659.
Повний текст джерела國立中正大學
通訊工程研究所
90
After more than thirty years of research and development, Orthogonal Frequency Division Multiplexing (OFDM) stands out conspicuously. Because of its high-speed data transmission and effectiveness in combating the frequency selective fading channel, OFDM technique is widely used in wireless communication nowadays. For the time being, a thorough research on OFDM becomes more essential. In this thesis, the basic principles and simulation of OFDM system are investigated in advance. Then, the researches on subcarrier allocation schemes over OFDM systems are proposed. By leaving out weak subcarriers and applying the subcarrier allocation scheme, the system performance can be guaranteed. However, it will lead to additional errors if the time-variant channel is considered. In digital communication, the error control coding techniques provide a way to improve the system performance. By taking its advantages into account, the subcarrier allocation scheme combined with different error control coding techniques are proposed. In this thesis, we employ the repeat code and linear block code to achieve our goal. The efficiency of these techniques will be demonstrated by simulation results. The proposed methods have better BER performance than original subcarrier allocation scheme.
Lydeamore, Michael John. "Approximations of stochastic household models for comparing antiviral allocation schemes." Thesis, 2015. http://hdl.handle.net/2440/93524.
Повний текст джерелаThesis (M.Phil.) -- University of Adelaide, School of Mathematical Sciences, 2015
張萬邦. "Energy-Efficient Resource Allocation Schemes for Relay-Enhanced OFDMA Networks." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/88807981784080218981.
Повний текст джерела國立交通大學
電信工程研究所
99
This thesis studies the problem of joint allocation of subchannel, transmission power, and phase duration in the relay-enhanced bidirectional orthogonal frequency-division multiple access (OFDMA) system. The challenges of this resource allocation problem arise from the complication of multiple-phase assignments within a subchannel since the relay station can provide an additional signal path from the base station to the user equipments (UEs). Existing research work does not fully consider all the influential factors to achieve feasible resource allocation for the relay-based networks. Considering the energy consumption is one of principal issues, the energy-efficient resource allocation (EERA) schemes are proposed in this thesis to design the allocation of subchannel, power, and phase duration for the UEs with the consideration of direct and two-hop communications. Both the four-phase and two-phase bidirectional relaying assignments and the network coding technique are considered to obtain the suboptimal solution for the proposed EERA schemes. Different weights are designed for the UEs to achieve the minimization of weighted system energy for the relay-enhanced networks. Simulation results show that the proposed EERA schemes can provide comparably better energy conservation and outage performance with the consideration of quality-of-service support.