{"id":84907,"date":"2000-08-06T00:00:00","date_gmt":"2000-08-06T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/nous-detectors-multiusuaris-i-estimadors-de-canals-cecs-per-a-sistemes-ds-cdma-amb-rebeot-ionosferic\/"},"modified":"2000-08-06T00:00:00","modified_gmt":"2000-08-06T00:00:00","slug":"nous-detectors-multiusuaris-i-estimadors-de-canals-cecs-per-a-sistemes-ds-cdma-amb-rebeot-ionosferic","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-de-la-tierra-y-del-espacio\/nous-detectors-multiusuaris-i-estimadors-de-canals-cecs-per-a-sistemes-ds-cdma-amb-rebeot-ionosferic\/","title":{"rendered":"Nous detectors multiusuaris i estimadors de canals cecs per a sistemes ds-cdma amb rebeot ionosferic"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Joan LLuis Pijoan Vidal <\/strong><\/h2>\n<p>Tradicionalmente, la ionosfera ha sido utilizada para transmisiones analogicas de voz y codigo morse. Con informaciones digitales, las modulaciones utilizadas son poco robustas y no sacan provecho del multicamino producido por los multiples rebotes.  el objetivo de este trabajo es el desarrollo de algoritmos que hacen de la ionosfera un canal de comunicaciones digitales a larga distancia. Por eso se aplicara la modulacion en espectro ensanchado, ampliamente utilizada en las comunicaciones moviles de esta ultima decada y en los futuros servicios de telecomunicacion, ya que es una herramienta muy capaz de luchar contra un canal ruidoso, con multicamino e interferencias de banda estrecha como es el canal ionosferico.  la tesis, en principio, esta dividida en dos partes: en primer lugar, se aplicaran los algoritmos ciegos mas recientes de estimacion de canal y deteccion multiusuario al canal ionosferico i se evidenciaran sus carencias por el hecho de trabajar en un canal poco ancho de banda de coherencia. a continuacion, se desarollaran nuevos algoritmos que mejoraran los anteriores, bien en coste computacional.  las pruebas, a parte de simularse previamente, se llevaran a cabo sobre el enlace digital establecido entre el inta (instituto nacional de tecnolog\u00eda aerospacial) en huelva y la escuela de ingenieria la salle en barcelona. este enlace se ha podido implementar gracias a la aprobacion del proyecto cicyt tic97-0787-c02, donde se enmarca gran parte de la riqueza de esta tesis. En este proyecto colaboran ademas la escuela superior de la rabida (universidad de huelva) y el observatorio del ebro.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Nous detectors multiusuaris i estimadors de canals cecs per a sistemes ds-cdma amb rebeot ionosferic<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Nous detectors multiusuaris i estimadors de canals cecs per a sistemes ds-cdma amb rebeot ionosferic <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Joan LLuis Pijoan Vidal <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Ram\u00f3n llull<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 08\/06\/2000<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Francesc Tarr\u00e9s Ruiz<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: daniel Cabedo puy <\/li>\n<li>eug\u00e9nia Santamar\u00eda p\u00e9rez (vocal)<\/li>\n<li>francesc Vallverd\u00fa bayes (vocal)<\/li>\n<li>gabriel Fern\u00e1ndez i ubiergo (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Joan LLuis Pijoan Vidal Tradicionalmente, la ionosfera ha sido utilizada para transmisiones analogicas de voz y codigo [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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