M?todos de interpola??o para sistemas OFDM
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da INATEL |
Texto Completo: | http://tede.inatel.br:8080/tede/handle/tede/142 |
Resumo: | The OFDM technique has been the aim of studies and researches in institutions all over the world. Its last applications are in Digital TV Systems like: the DVB- T, the ISDB-T and also in wireless systems, such as: Wi-Fi and Wi-Max. One of the greatest limitations of the OFDM technique?s use is the necessity of main- taining the synchronism between the N oscillators of reception and transmission systems, due to the orthogonality among the subcarriers. With the signal?s dig- ital processors? improvement, it became possible to solve this problem through the IFFT/FFT?s use. This work aims to present the equalizations? basic techniques used in modu- lations with multiple carriers. The OFDM signal?s symbols are subjected to the interferences during the transmission process due to the multiple routes of the channel and to the impulsive noises. The results of those interferences are the rotation and the constelation?s amplitude alteration. Then, it is necessary the inclusion of the pilot carriers in the transmission system, estimating the channel response in the frequency of each sub-carrier. In this study it was analysed four interpolation techniques to obtain the chan- nel?s frequency response. Through simulations, it was also arisen the respective performances. It was used the linear, cubic, FIR and FFT interpolations. An anl- ysis of each interpolation?s technique?s efficiency is presented, using some pattern channels for test with diverse characteristics. |
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Silveira, Adonias Costa da010.382.736-68http://lattes.cnpq.br/3407989815880512Mendes, Luciano Leonel269.670.448-18http://lattes.cnpq.br/9119890339398363Mendes, Luciano Leonel269.670.448-18http://lattes.cnpq.br/9119890339398363Silveira, Adonias Costa da010.382.736-68http://lattes.cnpq.br/3407989815880512546.536.496-34http://lattes.cnpq.br/5323051088453328Rocha, Carlos Augusto2017-03-27T19:29:30Z2011-11-30Rocha, Carlos Augusto. M?todos de interpola??o para sistemas OFDM. 2011. [82]. disserta??o( Mestrado em Engenharia de Telecomunica??es) - Instituto Nacional de Telecomunica??es, [Santa Rita do Sapuca?] .http://tede.inatel.br:8080/tede/handle/tede/142The OFDM technique has been the aim of studies and researches in institutions all over the world. Its last applications are in Digital TV Systems like: the DVB- T, the ISDB-T and also in wireless systems, such as: Wi-Fi and Wi-Max. One of the greatest limitations of the OFDM technique?s use is the necessity of main- taining the synchronism between the N oscillators of reception and transmission systems, due to the orthogonality among the subcarriers. With the signal?s dig- ital processors? improvement, it became possible to solve this problem through the IFFT/FFT?s use. This work aims to present the equalizations? basic techniques used in modu- lations with multiple carriers. The OFDM signal?s symbols are subjected to the interferences during the transmission process due to the multiple routes of the channel and to the impulsive noises. The results of those interferences are the rotation and the constelation?s amplitude alteration. Then, it is necessary the inclusion of the pilot carriers in the transmission system, estimating the channel response in the frequency of each sub-carrier. In this study it was analysed four interpolation techniques to obtain the chan- nel?s frequency response. Through simulations, it was also arisen the respective performances. It was used the linear, cubic, FIR and FFT interpolations. An anl- ysis of each interpolation?s technique?s efficiency is presented, using some pattern channels for test with diverse characteristics.A t?cnica OFDM tem sido objeto de estudos e pesquisas em institui??es de diversas partes do planeta. Suas ?ltimas aplica??es s?o em sistemas de TV Digital, como o DVB-T, o ISDB-T e tamb?m em sistemas de redes sem fio, como Wi-Fi e Wi-Max. Uma das maiores limita??es do uso da t?cnica OFDM ? a necessidade de manter o sincronismo entre os N osciladores dos sistemas de transmiss?o e recep??o, devido ? ortogonalidade entre as subportadoras. Com a evolu??o dos processadores digitais de sinais, tornou-se poss?vel solucionar este problema atrav?s do uso da IFFT/FFT. Este trabalho tem como objetivo apresentar as t?cnicas b?sicas de equaliza??es utilizadas em modula??o com m?ltiplas portadoras. Os s?mbolos do sinal OFDM est?o sujeitos ? interfer?ncias durante o processo de transmiss?o, devido a m?ltiplos percursos do canal e a ru?dos impulsivos. O resultado dessas interfer?ncias s?o a rota??o e a altera??o da amplitude da constela??o. Assim, necessita-se da inclus?o das portadoras pilotos no sistema de transmiss?o, estimando-se a resposta do canal na freq??ncia de cada subportadora. Neste trabalho, foram analisados quatro t?cnicas de interpola??o para a obten??o da resposta em freq??ncia do canal. Tamb?m levantou-se, atrav?s de simula??es, os respectivos desempenhos. Utilizou-se as interpola??es linear, c?bica, filtro FIR e por FFT. Uma an?lise da efici?ncia de cada t?cnica de interpola??o ? apresentada, utilizando-se alguns canais padronizados para testes com caracter?sticas diversificadas.Submitted by Tede Dspace (tede@inatel.br) on 2017-03-27T19:29:30Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Disserta??o Carlos A. Rocha.pdf: 1727179 bytes, checksum: 09e4dc9e67e5bef84c514fb49d80a51e (MD5)Made available in DSpace on 2017-03-27T19:29:30Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Disserta??o Carlos A. Rocha.pdf: 1727179 bytes, checksum: 09e4dc9e67e5bef84c514fb49d80a51e (MD5) Previous issue date: 2011-11-30application/pdfhttp://tede.inatel.br:8080/jspui/retrieve/1153/Disserta%c3%a7%c3%a3o%20Carlos%20A.%20Rocha.pdf.jpgporInstituto Nacional de Telecomunica??esMestrado em Engenharia de Telecomunica??esINATELBrasilInstituto Nacional de Telecomunica??eshttp://creativecommons.org/licenses/by-nd/4.0/info:eu-repo/semantics/openAccessSistema OFDM; interpola??o; m?ltiplos percursos; estima??o de canalEngenharia - Telecomunica??esM?todos de interpola??o para sistemas OFDMinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisreponame:Biblioteca Digital de Teses e Dissertações da INATELinstname:Instituto Nacional de Telecomunicações (INATEL)instacron:INATELLICENSElicense.txtlicense.txttext/plain; charset=utf-8112http://localhost:8080/tede/bitstream/tede/142/1/license.txtc6279291b293f0db82678eaa73a27769MD51CC-LICENSElicense_urllicense_urltext/plain; charset=utf-846http://localhost:8080/tede/bitstream/tede/142/2/license_url587cd8ffae15c8598ed3c46d248a3f38MD52license_textlicense_texttext/html; charset=utf-80http://localhost:8080/tede/bitstream/tede/142/3/license_textd41d8cd98f00b204e9800998ecf8427eMD53license_rdflicense_rdfapplication/rdf+xml; charset=utf-80http://localhost:8080/tede/bitstream/tede/142/4/license_rdfd41d8cd98f00b204e9800998ecf8427eMD54ORIGINALDisserta??o Carlos A. 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dc.title.por.fl_str_mv |
M?todos de interpola??o para sistemas OFDM |
title |
M?todos de interpola??o para sistemas OFDM |
spellingShingle |
M?todos de interpola??o para sistemas OFDM Rocha, Carlos Augusto Sistema OFDM; interpola??o; m?ltiplos percursos; estima??o de canal Engenharia - Telecomunica??es |
title_short |
M?todos de interpola??o para sistemas OFDM |
title_full |
M?todos de interpola??o para sistemas OFDM |
title_fullStr |
M?todos de interpola??o para sistemas OFDM |
title_full_unstemmed |
M?todos de interpola??o para sistemas OFDM |
title_sort |
M?todos de interpola??o para sistemas OFDM |
author |
Rocha, Carlos Augusto |
author_facet |
Rocha, Carlos Augusto |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Silveira, Adonias Costa da |
dc.contributor.advisor1ID.fl_str_mv |
010.382.736-68 |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/3407989815880512 |
dc.contributor.advisor-co1.fl_str_mv |
Mendes, Luciano Leonel |
dc.contributor.advisor-co1ID.fl_str_mv |
269.670.448-18 |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/9119890339398363 |
dc.contributor.referee1.fl_str_mv |
Mendes, Luciano Leonel |
dc.contributor.referee1ID.fl_str_mv |
269.670.448-18 |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/9119890339398363 |
dc.contributor.referee2.fl_str_mv |
Silveira, Adonias Costa da |
dc.contributor.referee2ID.fl_str_mv |
010.382.736-68 |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/3407989815880512 |
dc.contributor.authorID.fl_str_mv |
546.536.496-34 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/5323051088453328 |
dc.contributor.author.fl_str_mv |
Rocha, Carlos Augusto |
contributor_str_mv |
Silveira, Adonias Costa da Mendes, Luciano Leonel Mendes, Luciano Leonel Silveira, Adonias Costa da |
dc.subject.por.fl_str_mv |
Sistema OFDM; interpola??o; m?ltiplos percursos; estima??o de canal |
topic |
Sistema OFDM; interpola??o; m?ltiplos percursos; estima??o de canal Engenharia - Telecomunica??es |
dc.subject.cnpq.fl_str_mv |
Engenharia - Telecomunica??es |
description |
The OFDM technique has been the aim of studies and researches in institutions all over the world. Its last applications are in Digital TV Systems like: the DVB- T, the ISDB-T and also in wireless systems, such as: Wi-Fi and Wi-Max. One of the greatest limitations of the OFDM technique?s use is the necessity of main- taining the synchronism between the N oscillators of reception and transmission systems, due to the orthogonality among the subcarriers. With the signal?s dig- ital processors? improvement, it became possible to solve this problem through the IFFT/FFT?s use. This work aims to present the equalizations? basic techniques used in modu- lations with multiple carriers. The OFDM signal?s symbols are subjected to the interferences during the transmission process due to the multiple routes of the channel and to the impulsive noises. The results of those interferences are the rotation and the constelation?s amplitude alteration. Then, it is necessary the inclusion of the pilot carriers in the transmission system, estimating the channel response in the frequency of each sub-carrier. In this study it was analysed four interpolation techniques to obtain the chan- nel?s frequency response. Through simulations, it was also arisen the respective performances. It was used the linear, cubic, FIR and FFT interpolations. An anl- ysis of each interpolation?s technique?s efficiency is presented, using some pattern channels for test with diverse characteristics. |
publishDate |
2011 |
dc.date.issued.fl_str_mv |
2011-11-30 |
dc.date.accessioned.fl_str_mv |
2017-03-27T19:29:30Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
Rocha, Carlos Augusto. M?todos de interpola??o para sistemas OFDM. 2011. [82]. disserta??o( Mestrado em Engenharia de Telecomunica??es) - Instituto Nacional de Telecomunica??es, [Santa Rita do Sapuca?] . |
dc.identifier.uri.fl_str_mv |
http://tede.inatel.br:8080/tede/handle/tede/142 |
identifier_str_mv |
Rocha, Carlos Augusto. M?todos de interpola??o para sistemas OFDM. 2011. [82]. disserta??o( Mestrado em Engenharia de Telecomunica??es) - Instituto Nacional de Telecomunica??es, [Santa Rita do Sapuca?] . |
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http://tede.inatel.br:8080/tede/handle/tede/142 |
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Mestrado em Engenharia de Telecomunica??es |
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INATEL |
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