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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Implementa??o de processador banda base ofdma para downlink lte em fpga

Silva, Bruno Leonardo Mendes Tavares 31 March 2011 (has links)
Made available in DSpace on 2014-12-17T14:55:50Z (GMT). No. of bitstreams: 1 BrunoLMTS_DISSERT.pdf: 3836374 bytes, checksum: 430e05d393bcb665a7880036b61844c2 (MD5) Previous issue date: 2011-03-31 / This work treats of an implementation OFDMA baseband processor in hardware for LTE Downlink. The LTE or Long Term Evolution consist the last stage of development of the technology called 3G (Mobile System Third Generation) which offers an increasing in data rate and more efficiency and flexibility in transmission with application of advanced antennas and multiple carriers techniques. This technology applies in your physical layer the OFDMA technical (Orthogonal Frequency Division Multiple Access) for generation of signals and mapping of physical resources in downlink and has as base theoretical to OFDM multiple carriers technique (Orthogonal Frequency Division Multiplexing). With recent completion of LTE specifications, different hardware solutions have been developed, mainly, to the level symbol processing where the implementation of OFDMA processor in base band is commonly considered, because it is also considered a basic architecture of others important applications. For implementation of processor, the reconfigurable hardware offered by devices as FPGA are considered which shares not only to meet the high requirements of flexibility and adaptability of LTE as well as offers possibility of an implementation quick and efficient. The implementation of processor in reconfigurable hardware meets the specifications of LTE physical layer as well as have the flexibility necessary for to meet others standards and application which use OFDMA processor as basic architecture for your systems. The results obtained through of simulation and verification functional system approval the functionality and flexibility of processor implemented / Esta disserta??o trata da implementa??o de um processador banda base em hardware para Downlink LTE. O LTE ou Long Term Evolution compreende o ?ltimo est?gio de desenvolvimento das tecnologias chamadas de 3G (Telefonia M?vel de Terceira Gera??o) que prov? um incremento nas taxas de dados e maior efici?ncia e flexibilidade na transmiss?o com emprego de t?cnicas avan?adas de antenas e de t?cnicas de transmiss?o de m?ltiplas portadoras. Esta tecnologia aplica em sua camada f?sica a t?cnica OFDMA (Orthogonal F requency Division Multiple Access) para gera??o de sinais e mapeamento dos recursos f?sicos no downlink e tem como base te?rica ? t?cnica de m?ltiplas portadoras OFDM (Orthogonal Frequency Division Multiplexing). Com recente finaliza??o das especifica??es da tecnologia LTE, diversas solu??es em hardware tem sido propostas e desenvolvidas, principalmente, ao n?vel de processamento de s?mbolo em que a implementa??o do processador OFDMA em banda base ? comumente considerada, visto que ela ? tamb?m considerada como arquitetura b?sica de outras importantes aplica??es. Para implementa??o do processador, hardwares reconfigur?veis oferecidos por dispositivos como FPGA s?o considerados que visa n?o s? atender os altos requisitos de flexibilidade e adaptabilidade do LTE como tamb?m oferecem a possibilidade de uma implementa??o r?pida e eficiente. A implementa??o do processador em hardware reconfigur?vel atendeu as especifica??es da camada f?sica LTE bem como se mostrou flex?vel o suficiente para atender outros padr?es e aplica??es que utilizem o processador OFDMA como arquitetura b?sica de seus sistemas. Os resultados obtidos atrav?s de simula??o e verifica??o funcional do sistema atestam a funcionalidade e a flexibilidade do processador implementado
2

Baseband Processing in Analog Combining MIMO Systems: From Theoretical Design to FPGA Implementation

Elvira Arregui, Víctor 21 July 2011 (has links)
In this thesis, we consider an analog antenna combining architecture for a MIMO wireless transceiver, while pointing out its advantages with respect to the traditional MIMO architectures. In the first part of this work, we focus on the transceiver design, especially the calculation of the beamformers that must be applied at the RF. This analysis is performed in an OFDM system under different assumptions on the channel state information. As a result, several criteria and algorithms for the selection of the beamformers are proposed. In the second part, we address the FPGA design and implementation of a baseband processor for this architecture. This baseband processor is based on the standard IEEE 802.11a. Finally, some real-time tests of the implemented baseband processor are carried out both in stand-alone configuration and also with the whole physical layer setup. / En esta tesis consideramos una arquitectura de combinación analógica de antenas para una estación inalámbrica MIMO, señalando las ventajas de ésta con respecto a la arquitectura tradicional MIMO. En la primera parte de este trabajo analizamos el cálculo de los pesos que se deben aplicar en RF. Este análisis es realizado para un sistema OFDM bajo diferentes suposiciones sobre el conocimiento del canal en el transmisor. Como resultado, se ofrecen varios criterios y algoritmos para el cálculo de los pesos. La segunda parte se centra en el diseño y la implementación FPGA de un procesador banda base para esta arquitectura. Este procesador está basando en el estándar IEEE 802.11a. Finalmente se llevan a cabo algunos experimentos en tiempo-real del procesador banda base. Estos experimentos se han realizado tanto con el procesador aislado como integrado en el resto de la capa física del sistema.
3

Modernización de la red de acceso de un operador móvil para el caso de Lima Metropolitana

Otárola Correa, Diego Antonio, Campos Gonzales, Frank January 2015 (has links)
La presente tesina titulada “Modernización de la red de acceso de un operador móvil para el caso de Lima Metropolitana” expone una propuesta para un operador que tiene como objetivo poder incrementar su cobertura de servicio de segunda y cuarta generación, para esto se definen conceptos teóricos en base a lo que son las tecnologías de telefonía móvil celular de tipo GSM, UMTS y LTE y se compararan con las características técnicas de los equipos que se plantean usar demostrándose que estos pueden optimizar la red de acceso del operador en cobertura y funcionamiento para brindar un mejor servicio en base a 2G y 4G. Para lograr el objetivo propuesto, esta tesina describe el diseño y dimensionamiento de proyecto, pasos para su ejecución, especificaciones técnicas de los equipos, procedimiento para la puesta en servicio y resultados en base a pruebas del servicio y KPI. The current thesis entitled “Modernización de la red de acceso de un operador móvil para el caso de Lima Metropolitana” exposes a proposal for a mobile operator that has as a target increase their second and fourth generator coverage. For achieve this we have to defined theoric concepts based on the mobile telecommunication technology GSM, UMTS and LTE and compare with the features of equipment proposed to use proving that the coverage and performance of the access network of the operator can be improved for provide a better 2G and 4G service. For achieve this target proposed, this thesis describes the design and sizing of Project, steps for execution, technical features of equipment, on air procedure and results base on the testing service and KPI.
4

Diseño de migración de nodos B aplicado para una RNC caida de una red movil

Mallqui Morales, Nayda Isabel January 2015 (has links)
La presente tesina consiste en el diseño de migración de nodos B aplicado para una RNC caída de una red móvil, con la finalidad de solucionar los problemas que se presenten ante un incidente que afecte los servicios de voz y datos de los usurarios de una red móvil. En el desarrollo de la tesina, se describe el planteamiento del problema, el marco teórico de la tecnología UMTS y posteriormente nos centramos en los elementos principales de esta tecnología. También describimos los equipos importantes a utilizar en desarrollo del proyecto, en este caso nos enfocamos en la descripción de la RNC. Y finalmente describimos el desarrollo del proyecto, el diseño de la solución e implementación de la misma, y en donde se presentan los resultados del diseño. This thesis is the design of migration of nodes B and its a applied when RNC fall for a mobile network, in order to solve the problems that arise before an incident affecting voice and data services from a mobile network. In developing the thesis, we describe the theoretical framework of UMTS technology and then we focus on the main elements of this technology. We also describe the important equipment used in project development; in this case we focus on the description of the RNC. And finally we describe the solution of design and implementation .Also, the results of this project.

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