Impacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativo
Autor(a) principal: | |
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Data de Publicação: | 2018 |
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/177 |
Resumo: | The concept of cognitive radio, CR emerged with the objective of relieving the scarcity and under-utilization of the radio frequency. Fundamentally, the reconfigurability and the ability of the spectrum opportunistic utilization through spectrum sensing allow CRs to monitor and locate frequency bands that are not being occupied by the users that hold the license to use these bands, called primary users (PU) at any moment and location. The spectrum sensing performance may be affected due to various factors inherent in wireless communication systems such as thermal noise, hidden terminal, multipath fading and blocking or shadowing. One way of easing the effect of these factors is the use of cooperative spectral sensing (cooperative spectrum sensing (CSS). CSS takes advantage of the spatial diversity promoted by several geographically spaced CRs to reduce uncertainty in local decision-making relative to the state of the sensed channel. Nevertheless, in traditional CSS schemes the need for spectral resource is raised due to the increase in the number of CRs in the orthogonal transmission techniques used to provide channels dedicated to these CRs. Recently, a CSS scheme has been proposed where all the CRs in cooperation send simultaneously their individual decisions to the fusion center (FC) using the same frequency of the control channel. Due to this, the spectral efficiency is increased in the use of the control channel. However, as a consequence, the signals received by the CF add up in a noncoherent way due to the intentional interference produced by this scheme. However, even with this interference, the global decision process on the occupation state of the sensed channel can still be performed. In order to improve the performance of this system, a CSS technique was proposed, where the individual decisions of the MCRs are pre-distorted before being sent to the FC simultaneously and at the same frequency, in order to pre-compensate channel gains of control. Due to this, the spectral efficiency of the above mentioned scheme is maintained, in addition to providing better performance in spectral sensing. However, no research was done about the impact of control channel estimation errors in this technique. This thesis analyzes the performance of the CSS technique, with pre-compensation, under the influence of errors in the estimate of the channel gains, which degrade the pre-compensation. In order to assign the analysis of a practical appeal, the estimation errors are modeled in agreement with the linear estimation method under the criterion of minimum mean square error (LMMSE) and with the sample average estimator (SA), allowing an adequate tying between the degree of inaccuracy of the estimation and the signal-to-noise ratio at the input of the receiver where the estimation is performed. |
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Guimar?es, Dayan Adionel739.337.836-15://lattes.cnpq.br/2503439503631682Guimar?es, Dayan Adionel739.337.836-15lattes.cnpq.br/2503439503631682Lopes, C?ssio Guimar?eshttp://lattes.cnpq.br/9143368724662889Mafra, Samuel Baraldi056.666.329-57http://lattes.cnpq.br/9492423249629649102.264.706-79Boas, Fernanda Mitchelly Vilas2019-02-13T20:08:17Z2018-12-11Boas, Fernanda Mitchelly Vilas. Impacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativo. 2018. (87]. disserta??o( Mestrado em Engenharia de Telecomunica??es) - Instituto Nacional de Telecomunica??es, [Santa Rita do Sapucai] .http://tede.inatel.br:8080/tede/handle/tede/177The concept of cognitive radio, CR emerged with the objective of relieving the scarcity and under-utilization of the radio frequency. Fundamentally, the reconfigurability and the ability of the spectrum opportunistic utilization through spectrum sensing allow CRs to monitor and locate frequency bands that are not being occupied by the users that hold the license to use these bands, called primary users (PU) at any moment and location. The spectrum sensing performance may be affected due to various factors inherent in wireless communication systems such as thermal noise, hidden terminal, multipath fading and blocking or shadowing. One way of easing the effect of these factors is the use of cooperative spectral sensing (cooperative spectrum sensing (CSS). CSS takes advantage of the spatial diversity promoted by several geographically spaced CRs to reduce uncertainty in local decision-making relative to the state of the sensed channel. Nevertheless, in traditional CSS schemes the need for spectral resource is raised due to the increase in the number of CRs in the orthogonal transmission techniques used to provide channels dedicated to these CRs. Recently, a CSS scheme has been proposed where all the CRs in cooperation send simultaneously their individual decisions to the fusion center (FC) using the same frequency of the control channel. Due to this, the spectral efficiency is increased in the use of the control channel. However, as a consequence, the signals received by the CF add up in a noncoherent way due to the intentional interference produced by this scheme. However, even with this interference, the global decision process on the occupation state of the sensed channel can still be performed. In order to improve the performance of this system, a CSS technique was proposed, where the individual decisions of the MCRs are pre-distorted before being sent to the FC simultaneously and at the same frequency, in order to pre-compensate channel gains of control. Due to this, the spectral efficiency of the above mentioned scheme is maintained, in addition to providing better performance in spectral sensing. However, no research was done about the impact of control channel estimation errors in this technique. This thesis analyzes the performance of the CSS technique, with pre-compensation, under the influence of errors in the estimate of the channel gains, which degrade the pre-compensation. In order to assign the analysis of a practical appeal, the estimation errors are modeled in agreement with the linear estimation method under the criterion of minimum mean square error (LMMSE) and with the sample average estimator (SA), allowing an adequate tying between the degree of inaccuracy of the estimation and the signal-to-noise ratio at the input of the receiver where the estimation is performed.O conceito de r?dio cognitivo (cognitive radio, CR) surgiu com o objetivo de aliviar a escassez e a subutiliza??o do espectro de radiofrequ?ncias. Fundamentalmente, a reconfigurabilidade e a capacidade de uso oportunista de espectro por meio de sensoriamento espectral permitem aos CRs monitorar e localizar bandas de frequ?ncias que n?o est?o sendo ocupadas pelos usu?rios que det?m a licen?a de uso destas bandas, denominados usu?rios prim?rios (primary user, PU), em determinado momento e localiza??o. O desempenho do sensoriamento espectral pode ser afetado devido ? v?rios fatores inerentes aos sistemas de comunica??o sem fio tais como ru?do t?rmico, terminal escondido, desvanecimento multipercurso e bloqueio ou sombreamento. Uma forma de amenizar o efeito destes fatores ? o uso do sensoriamento espectral cooperativo (cooperative spectrum sensing, CSS). O CSS se aproveita da diversidade espacial promovida por v?rios CRs geograficamente espa?ados para reduzir a incerteza na tomada de decis?o local em rela??o ao estado do canal sensoriado. Contudo, nos esquemas CSS tradicionais aumenta-se a necessidade de recurso espectral devido ao aumento do n?mero de CRs nas t?cnicas de transmiss?o ortogonais utilizadas para proporcionar canais dedicados a estes CRs. Recentemente, foi proposto um esquema CSS em que todos os CRs em coopera??o enviam de forma simult?nea suas decis?es individuais para o centro de fus?o (fusion center, FC) empregando a mesma frequ?ncia do canal de controle. Devido a isto, aumenta-se a efici?ncia espectral no uso do canal de controle. Por?m, como consequ?ncia, os sinais recebidos pelo FC se somam de forma n?o coerente devido a interfer?ncia intencional produzida por este esquema. Entretanto, mesmo com esta interfer?ncia, o processo de decis?o global sobre o estado de ocupa??o do canal sensoriado pode ainda ser realizado. Visando melhorar o desempenho deste sistema, foi proposta uma t?cnica CSS, em que as decis?es individuais dos M CRs s?o pr?-distorcidas antes de serem enviadas ao FC de forma simult?nea e na mesma frequ?ncia, com o objetivo de pr?-compensar os ganhos do canal de controle. Devido a isto, a efici?ncia espectral do esquema supramencionado ? mantida, al?m de proporcionar melhor desempenho no sensoriamento espectral. No entanto, nenhumainvestiga??o foi feita sobre o impacto dos erros de estima??o de canal de controle nesta t?cnica. Nesta disserta??o analisa-se o desempenho da t?cnica CSS com pr?-compensa??o, sob a influ?ncia de erros na estima??o dos ganhos de canal, os quais degradam a pr?-compensa??o. Objetivando atribuir ? an?lise um apelo pr?tico, os erros de estima??o s?o modelados em concord?ncia com o m?todo de estima??o linear sob o crit?rio do m?nimo erro quadr?tico m?dio (linear minimum mean square error, LMMSE) e com o estimador por m?dia amostral (sample average, SA), permitindo adequada amarra??o entre o grau de imprecis?o da estimativa e a rela??o sinal-ru?do na entrada do receptor em que tal estima??o ? realizada.Submitted by Tede Dspace (tede@inatel.br) on 2019-02-13T20:08:16Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Disserta??o Fernanda Mitchelly Vilas Boas (1).pdf: 976226 bytes, checksum: 513e638737426c623d4ebdb3ce803710 (MD5)Made available in DSpace on 2019-02-13T20:08:17Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Disserta??o Fernanda Mitchelly Vilas Boas (1).pdf: 976226 bytes, checksum: 513e638737426c623d4ebdb3ce803710 (MD5) Previous issue date: 2018-12-11application/pdfhttp://tede.inatel.br:8080/jspui/retrieve/1434/Disserta%c3%a7%c3%a3o%20Fernanda%20Mitchelly%20Vilas%20Boas%20%281%29.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/openAccessR?dio cognitivo; sensoriamento espectral cooperativo; fus?o de decis?es; pr?-compensa??o de canalCognitive radio; co-operative spectral sensing; fusion of decisions; channel pre-compensation.Engenharia - Telecomunica??esImpacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativoinfo: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/177/1/license.txtc6279291b293f0db82678eaa73a27769MD51CC-LICENSElicense_urllicense_urltext/plain; charset=utf-846http://localhost:8080/tede/bitstream/tede/177/2/license_url587cd8ffae15c8598ed3c46d248a3f38MD52license_textlicense_texttext/html; charset=utf-80http://localhost:8080/tede/bitstream/tede/177/3/license_textd41d8cd98f00b204e9800998ecf8427eMD53license_rdflicense_rdfapplication/rdf+xml; charset=utf-80http://localhost:8080/tede/bitstream/tede/177/4/license_rdfd41d8cd98f00b204e9800998ecf8427eMD54ORIGINALDisserta??o Fernanda Mitchelly Vilas Boas (1).pdfDisserta??o Fernanda Mitchelly Vilas Boas (1).pdfapplication/pdf976226http://localhost:8080/tede/bitstream/tede/177/5/Disserta%C3%A7%C3%A3o+Fernanda+Mitchelly+Vilas+Boas+%281%29.pdf513e638737426c623d4ebdb3ce803710MD55TEXTDisserta??o Fernanda Mitchelly Vilas Boas (1).pdf.txtDisserta??o Fernanda Mitchelly Vilas Boas (1).pdf.txttext/plain123158http://localhost:8080/tede/bitstream/tede/177/6/Disserta%C3%A7%C3%A3o+Fernanda+Mitchelly+Vilas+Boas+%281%29.pdf.txt09d580e9c572fc6cb2b8dba57cfd7f72MD56THUMBNAILDisserta??o Fernanda Mitchelly Vilas Boas (1).pdf.jpgDisserta??o Fernanda Mitchelly Vilas Boas (1).pdf.jpgimage/jpeg3308http://localhost:8080/tede/bitstream/tede/177/7/Disserta%C3%A7%C3%A3o+Fernanda+Mitchelly+Vilas+Boas+%281%29.pdf.jpg1cab9331b3d86855bdfe556ea6f08d8dMD57tede/1772019-02-18 16:35:50.381oai:localhost:tede/177QXV0b3Jpem8gYSBwdWJsaWNhPz9vIGRhIG1pbmhhIERpc3NlcnRhPz9vIGRlIE1lc3RyYWRvLCBlbSBmb3JtYXRvIFBERiwgY29tIGJsb3F1ZWlvIGRlIGVkaT8/bywgY29sYWdlbSBlIGM/cGlhLg==Biblioteca Digital de Teses e Dissertaçõeshttp://tede.inatel.br:8080/jspui/PUBhttp://tede.inatel.br:8080/oai/requestbiblioteca@inatel.br || biblioteca.atendimento@inatel.bropendoar:2019-02-18T19:35:50Biblioteca Digital de Teses e Dissertações da INATEL - Instituto Nacional de Telecomunicações (INATEL)false |
dc.title.por.fl_str_mv |
Impacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativo |
title |
Impacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativo |
spellingShingle |
Impacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativo Boas, Fernanda Mitchelly Vilas R?dio cognitivo; sensoriamento espectral cooperativo; fus?o de decis?es; pr?-compensa??o de canal Cognitive radio; co-operative spectral sensing; fusion of decisions; channel pre-compensation. Engenharia - Telecomunica??es |
title_short |
Impacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativo |
title_full |
Impacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativo |
title_fullStr |
Impacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativo |
title_full_unstemmed |
Impacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativo |
title_sort |
Impacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativo |
author |
Boas, Fernanda Mitchelly Vilas |
author_facet |
Boas, Fernanda Mitchelly Vilas |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Guimar?es, Dayan Adionel |
dc.contributor.advisor1ID.fl_str_mv |
739.337.836-15 |
dc.contributor.advisor1Lattes.fl_str_mv |
://lattes.cnpq.br/2503439503631682 |
dc.contributor.referee1.fl_str_mv |
Guimar?es, Dayan Adionel |
dc.contributor.referee1ID.fl_str_mv |
739.337.836-15 |
dc.contributor.referee1Lattes.fl_str_mv |
lattes.cnpq.br/2503439503631682 |
dc.contributor.referee2.fl_str_mv |
Lopes, C?ssio Guimar?es |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/9143368724662889 |
dc.contributor.referee3.fl_str_mv |
Mafra, Samuel Baraldi |
dc.contributor.referee3ID.fl_str_mv |
056.666.329-57 |
dc.contributor.referee3Lattes.fl_str_mv |
http://lattes.cnpq.br/9492423249629649 |
dc.contributor.authorID.fl_str_mv |
102.264.706-79 |
dc.contributor.author.fl_str_mv |
Boas, Fernanda Mitchelly Vilas |
contributor_str_mv |
Guimar?es, Dayan Adionel Guimar?es, Dayan Adionel Lopes, C?ssio Guimar?es Mafra, Samuel Baraldi |
dc.subject.por.fl_str_mv |
R?dio cognitivo; sensoriamento espectral cooperativo; fus?o de decis?es; pr?-compensa??o de canal |
topic |
R?dio cognitivo; sensoriamento espectral cooperativo; fus?o de decis?es; pr?-compensa??o de canal Cognitive radio; co-operative spectral sensing; fusion of decisions; channel pre-compensation. Engenharia - Telecomunica??es |
dc.subject.eng.fl_str_mv |
Cognitive radio; co-operative spectral sensing; fusion of decisions; channel pre-compensation. |
dc.subject.cnpq.fl_str_mv |
Engenharia - Telecomunica??es |
description |
The concept of cognitive radio, CR emerged with the objective of relieving the scarcity and under-utilization of the radio frequency. Fundamentally, the reconfigurability and the ability of the spectrum opportunistic utilization through spectrum sensing allow CRs to monitor and locate frequency bands that are not being occupied by the users that hold the license to use these bands, called primary users (PU) at any moment and location. The spectrum sensing performance may be affected due to various factors inherent in wireless communication systems such as thermal noise, hidden terminal, multipath fading and blocking or shadowing. One way of easing the effect of these factors is the use of cooperative spectral sensing (cooperative spectrum sensing (CSS). CSS takes advantage of the spatial diversity promoted by several geographically spaced CRs to reduce uncertainty in local decision-making relative to the state of the sensed channel. Nevertheless, in traditional CSS schemes the need for spectral resource is raised due to the increase in the number of CRs in the orthogonal transmission techniques used to provide channels dedicated to these CRs. Recently, a CSS scheme has been proposed where all the CRs in cooperation send simultaneously their individual decisions to the fusion center (FC) using the same frequency of the control channel. Due to this, the spectral efficiency is increased in the use of the control channel. However, as a consequence, the signals received by the CF add up in a noncoherent way due to the intentional interference produced by this scheme. However, even with this interference, the global decision process on the occupation state of the sensed channel can still be performed. In order to improve the performance of this system, a CSS technique was proposed, where the individual decisions of the MCRs are pre-distorted before being sent to the FC simultaneously and at the same frequency, in order to pre-compensate channel gains of control. Due to this, the spectral efficiency of the above mentioned scheme is maintained, in addition to providing better performance in spectral sensing. However, no research was done about the impact of control channel estimation errors in this technique. This thesis analyzes the performance of the CSS technique, with pre-compensation, under the influence of errors in the estimate of the channel gains, which degrade the pre-compensation. In order to assign the analysis of a practical appeal, the estimation errors are modeled in agreement with the linear estimation method under the criterion of minimum mean square error (LMMSE) and with the sample average estimator (SA), allowing an adequate tying between the degree of inaccuracy of the estimation and the signal-to-noise ratio at the input of the receiver where the estimation is performed. |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018-12-11 |
dc.date.accessioned.fl_str_mv |
2019-02-13T20:08:17Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/masterThesis |
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masterThesis |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
Boas, Fernanda Mitchelly Vilas. Impacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativo. 2018. (87]. disserta??o( Mestrado em Engenharia de Telecomunica??es) - Instituto Nacional de Telecomunica??es, [Santa Rita do Sapucai] . |
dc.identifier.uri.fl_str_mv |
http://tede.inatel.br:8080/tede/handle/tede/177 |
identifier_str_mv |
Boas, Fernanda Mitchelly Vilas. Impacto dos erros de estima??o de canal na fus?o de decis?es com pr?-distor??o aplicada ao sensoriamento espectral cooperativo. 2018. (87]. disserta??o( Mestrado em Engenharia de Telecomunica??es) - Instituto Nacional de Telecomunica??es, [Santa Rita do Sapucai] . |
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INATEL |
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