An?lise de desempenho de sistemas multiportadora em canais com ceifamento de pico
Autor(a) principal: | |
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Data de Publicação: | 2003 |
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/96 |
Resumo: | The advent of Digital Television has brought a new panorama for digital telecommunications, presenting new problems and challenges to be addressed effectively. Today, there are three different standards in operation: the ATSC developed in the USA, the DVB-T developed in Europe and the ISDB-T developed in Japan. Among these standards, DVB-T and ISDB-T use a transmission technique with (ORDM) (ortho-gonal Frequency Division Multiplexing). With the adoption of this technique in European and Japanese digital television standards, there has been a significant increase in interest in the implementation of OFDM. Among the major difficulties encountered, two are worth mentioning: the complexity of constructing several oscillators in phase and the problem of signal harvesting by the power amplifier. The first problem occurs because this type of transmission uses a large number of carriers that need to be in phase to guarantee the orthogonality between them. With the development of digital signal processors, it was possible to solve this problem by using IFFT for modulation and FFT for demodulation. The second problem occurs because the OFDM signal has a high relation between the peak power and the average power, that is, this signal can have high amplitude peaks. As power amplifiers are designed to operate near the saturation point, in order to provide high performance, these peaks are harvested, introducing a non-linear distortion in the signal. The objective of this work is to first present the methods used for generation and reception of OFDM signals and to study their characteristics, determining the reasons for which the harvesting occurs. Based on these characteristics, two methods for modeling the harvesting are presented, obtaining the probability of error in both cases. Also a comparison is made between the obtained results, defining the most adequate model to estimate the probability of symbol error due to the harvest. |
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Silveira, Adonias Costa daSilveira, Adonias Costa dahttp://lattes.cnpq.br/3407989815880512Gomes, Geraldo Gil Ramundo705.571.367-68http://lattes.cnpq.br/4252672977912311Silveira, Adonias Costa da010.382.736-68http://lattes.cnpq.br/3407989815880512Fasolo, Sandro Adrianohttp://lattes.cnpq.br/3997284163467407Baldini Filho, Renatohttp://lattes.cnpq.br/4164165557041199269.670.448-18http://lattes.cnpq.br/9119890339398363Mendes, Luciano Leonel2017-01-19T16:54:39Z2003-06-18Mendes, Luciano Leonel. An?lise de desempenho de sistemas multiportadora em canais com ceifamento de pico. 2003. [89]. 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/96The advent of Digital Television has brought a new panorama for digital telecommunications, presenting new problems and challenges to be addressed effectively. Today, there are three different standards in operation: the ATSC developed in the USA, the DVB-T developed in Europe and the ISDB-T developed in Japan. Among these standards, DVB-T and ISDB-T use a transmission technique with (ORDM) (ortho-gonal Frequency Division Multiplexing). With the adoption of this technique in European and Japanese digital television standards, there has been a significant increase in interest in the implementation of OFDM. Among the major difficulties encountered, two are worth mentioning: the complexity of constructing several oscillators in phase and the problem of signal harvesting by the power amplifier. The first problem occurs because this type of transmission uses a large number of carriers that need to be in phase to guarantee the orthogonality between them. With the development of digital signal processors, it was possible to solve this problem by using IFFT for modulation and FFT for demodulation. The second problem occurs because the OFDM signal has a high relation between the peak power and the average power, that is, this signal can have high amplitude peaks. As power amplifiers are designed to operate near the saturation point, in order to provide high performance, these peaks are harvested, introducing a non-linear distortion in the signal. The objective of this work is to first present the methods used for generation and reception of OFDM signals and to study their characteristics, determining the reasons for which the harvesting occurs. Based on these characteristics, two methods for modeling the harvesting are presented, obtaining the probability of error in both cases. Also a comparison is made between the obtained results, defining the most adequate model to estimate the probability of symbol error due to the harvest.O advento da Televis?o Digital trouxe um novo panorama para as telecomunica??es digitais, apresentando novos problemas e desafios a serem abordados de maneira eficaz. Hoje, existem tr?s padr?es diferentes em opera??o: o ATSC desenvolvido nos EUA, o DVB-T desenvolvido na Europa e o ISDB-T desenvolvido no Jap?o. Dentre esses padr?es, o DVB-T e o ISDB-T utilizam uma t?cnica de transmiss?o com m?ltiplas portadoras denominada de OFDM (emph{Ortho-gonal Frequency Division Multiplexing} - Multiplexa??o por Divis?o em Freq??ncias Ortogonais). Com a ado??o desta t?cnica nos padr?es de televis?o digital europeu e japon?s, houve um aumento significativo no interesse na implementa??o do OFDM. Dentre as maiores dificuldades encontradas, duas merecem destaque: a complexidade de construir v?rios osciladores em fase e o problema do ceifamento do sinal pelo amplificador de pot?ncia. O primeiro problema ocorre porque este tipo de transmiss?o utiliza um elevado n?mero de portadoras que necessitam estar em fase para garantir a ortogonalidade entre as mesmas. Com o desenvolvimento dos processadores digitais de sinais, foi poss?vel resolver este problema, atrav?s do uso da IFFT para a modula??o e da FFT para a demodula??o. O segundo problema apresentado ocorre porque o sinal OFDM apresenta uma alta rela??o entre a pot?ncia de pico e a pot?ncia m?dia, ou seja, este sinal pode apresentar picos de amplitude elevados. Como os amplificadores de pot?ncia s?o projetados para operar pr?ximo do ponto de satura??o, afim de apresentar um alto rendimento, esses picos s?o ceifados, introduzindo uma distor??o n?o linear no sinal. O objetivo deste trabalho ?, primeiro apresentar os m?todos utilizados para gera??o e recep??o de sinais OFDM e estudar suas caracter?sticas, determinando os motivos pelos quais ocorrem o ceifamento. Baseados nestas caracter?sticas, apresenta-se dois m?todos para modelagem do ceifamento, obtendo-se a probabilidade de erro em ambos os casos. Tamb?m realiza-se uma compara??o entre os resultados obtidos, definindo a modelagem mais adequada para estimar a probabilidade de erro de s?mbolo devida ao ceifamento.Submitted by Tede Dspace (tede@inatel.br) on 2017-01-19T16:54:39Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese Luciano Leonel Mendes.pdf: 4090776 bytes, checksum: 0f8bf014f7bb7316a650c209560b5275 (MD5)Made available in DSpace on 2017-01-19T16:54:39Z (GMT). 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dc.title.por.fl_str_mv |
An?lise de desempenho de sistemas multiportadora em canais com ceifamento de pico |
title |
An?lise de desempenho de sistemas multiportadora em canais com ceifamento de pico |
spellingShingle |
An?lise de desempenho de sistemas multiportadora em canais com ceifamento de pico Mendes, Luciano Leonel Modula??o digital; multiportadora; ceifamento; modelos de canal; desempenho Engenharia - Telecomunica??es |
title_short |
An?lise de desempenho de sistemas multiportadora em canais com ceifamento de pico |
title_full |
An?lise de desempenho de sistemas multiportadora em canais com ceifamento de pico |
title_fullStr |
An?lise de desempenho de sistemas multiportadora em canais com ceifamento de pico |
title_full_unstemmed |
An?lise de desempenho de sistemas multiportadora em canais com ceifamento de pico |
title_sort |
An?lise de desempenho de sistemas multiportadora em canais com ceifamento de pico |
author |
Mendes, Luciano Leonel |
author_facet |
Mendes, Luciano Leonel |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Silveira, Adonias Costa da |
dc.contributor.advisor1ID.fl_str_mv |
Silveira, Adonias Costa da |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/3407989815880512 |
dc.contributor.advisor-co1.fl_str_mv |
Gomes, Geraldo Gil Ramundo |
dc.contributor.advisor-co1ID.fl_str_mv |
705.571.367-68 |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/4252672977912311 |
dc.contributor.referee1.fl_str_mv |
Silveira, Adonias Costa da |
dc.contributor.referee1ID.fl_str_mv |
010.382.736-68 |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/3407989815880512 |
dc.contributor.referee2.fl_str_mv |
Fasolo, Sandro Adriano |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/3997284163467407 |
dc.contributor.referee3.fl_str_mv |
Baldini Filho, Renato |
dc.contributor.referee3Lattes.fl_str_mv |
http://lattes.cnpq.br/4164165557041199 |
dc.contributor.authorID.fl_str_mv |
269.670.448-18 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/9119890339398363 |
dc.contributor.author.fl_str_mv |
Mendes, Luciano Leonel |
contributor_str_mv |
Silveira, Adonias Costa da Gomes, Geraldo Gil Ramundo Silveira, Adonias Costa da Fasolo, Sandro Adriano Baldini Filho, Renato |
dc.subject.por.fl_str_mv |
Modula??o digital; multiportadora; ceifamento; modelos de canal; desempenho |
topic |
Modula??o digital; multiportadora; ceifamento; modelos de canal; desempenho Engenharia - Telecomunica??es |
dc.subject.cnpq.fl_str_mv |
Engenharia - Telecomunica??es |
description |
The advent of Digital Television has brought a new panorama for digital telecommunications, presenting new problems and challenges to be addressed effectively. Today, there are three different standards in operation: the ATSC developed in the USA, the DVB-T developed in Europe and the ISDB-T developed in Japan. Among these standards, DVB-T and ISDB-T use a transmission technique with (ORDM) (ortho-gonal Frequency Division Multiplexing). With the adoption of this technique in European and Japanese digital television standards, there has been a significant increase in interest in the implementation of OFDM. Among the major difficulties encountered, two are worth mentioning: the complexity of constructing several oscillators in phase and the problem of signal harvesting by the power amplifier. The first problem occurs because this type of transmission uses a large number of carriers that need to be in phase to guarantee the orthogonality between them. With the development of digital signal processors, it was possible to solve this problem by using IFFT for modulation and FFT for demodulation. The second problem occurs because the OFDM signal has a high relation between the peak power and the average power, that is, this signal can have high amplitude peaks. As power amplifiers are designed to operate near the saturation point, in order to provide high performance, these peaks are harvested, introducing a non-linear distortion in the signal. The objective of this work is to first present the methods used for generation and reception of OFDM signals and to study their characteristics, determining the reasons for which the harvesting occurs. Based on these characteristics, two methods for modeling the harvesting are presented, obtaining the probability of error in both cases. Also a comparison is made between the obtained results, defining the most adequate model to estimate the probability of symbol error due to the harvest. |
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2003 |
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2003-06-18 |
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2017-01-19T16:54:39Z |
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Mendes, Luciano Leonel. An?lise de desempenho de sistemas multiportadora em canais com ceifamento de pico. 2003. [89]. 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/96 |
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Mendes, Luciano Leonel. An?lise de desempenho de sistemas multiportadora em canais com ceifamento de pico. 2003. [89]. disserta??o( Mestrado em Engenharia de Telecomunica??es) - Instituto Nacional de Telecomunica??es, [Santa Rita do Sapuca?] . |
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