{"id":54623,"date":"2018-03-09T22:42:19","date_gmt":"2018-03-09T22:42:19","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/antenna-selection-techniques-in-single-and-multi-user-systems-a-cross-layer-approach\/"},"modified":"2018-03-09T22:42:19","modified_gmt":"2018-03-09T22:42:19","slug":"antenna-selection-techniques-in-single-and-multi-user-systems-a-cross-layer-approach","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/radiocomunicaciones\/antenna-selection-techniques-in-single-and-multi-user-systems-a-cross-layer-approach\/","title":{"rendered":"Antenna selection techniques in single-and-multi-user systems: a cross-layer approach"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Jos\u00e9 L\u00f3pez Vicario <\/strong><\/h2>\n<p>En la \u00faltima d\u00e9cada, la gran demanda de aplicaciones inal\u00e1mbricas con altas velocidades de transmisi\u00f3n ha motivado el estudio y dise\u00f1o de nuevas tecnolog\u00edas de comunicaci\u00f3n. Entre todas ellas, los esquemas con m\u00faltiples antenas han mostrado obtener considerables ventajas en t\u00e9rminos de eficiencia espectral. Para explotar la capacidad de estos sistemas, deben llevarse a cabo t\u00e9cnicas de procesado de se\u00f1al pero, al menos que los enlaces ascendentes y descendentes presenten alg\u00fan tipo de reciprocidad, un canal de feedback es necesario para informar del estado del canal al transmisor. En ese contexto, los sistemas basados en la selecci\u00f3n de antenas han emergido como una alternativa efectiva dado que requieren una baja cantidad de informaci\u00f3n en el canal de feedback. los algoritmos de selecci\u00f3n de antenas se suelen dise\u00f1ar con el prop\u00f3sito de maximizar par\u00e1metros en la capa f\u00edsica pero, recientemente, criterios de optimizaci\u00f3n basados en dise\u00f1os cross-layer han estado ganando popularidad. Esto es principalmente debido a la ineficiencia observada cuando una pila de protocolos open systems interconnection (osi) se aplica directamente a una red inal\u00e1mbrica. B\u00e1sicamente, estos nuevos criterios cross-layer se basan en combinar funcionalidades e informaciones entre las diferentes capas de la pila de protocolos para conseguir las m\u00e1ximas prestaciones end-to-end. en esta tesis, nos centramos en el estudio, desde un punto de vista cross-layer, de algoritmos de selecci\u00f3n de antenas tanto en escenarios con un \u00fanico usuario como en entornos multi-usuario. En concreto,  consideramos las dos capas m\u00e1s bajas de la pila de protocolos (capas f\u00edsica y de enlace) y nuestros dise\u00f1os se basan en maximizar las prestaciones en la capa de enlace. en primer lugar, la selecci\u00f3n de antenas se lleva a cabo en un entorno con un \u00fanico usuario, en el cual se adoptan una arquitectura vertical bell-labs layered space-time (v-blast) y una estrategia hybrid-automatic repe<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Antenna selection techniques in single-and-multi-user systems: a cross-layer approach<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Antenna selection techniques in single-and-multi-user systems: a cross-layer approach <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Jos\u00e9 L\u00f3pez Vicario <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 20\/09\/2006<\/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>Carles Anton Haro<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Miguel angel Lagunas hern\u00e1ndez <\/li>\n<li>christoph Mecklenbr\u00ed\u00a4uker (vocal)<\/li>\n<li>umberto Spagnolini (vocal)<\/li>\n<li>diego Bartolome calvo (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Jos\u00e9 L\u00f3pez Vicario En la \u00faltima d\u00e9cada, la gran demanda de aplicaciones inal\u00e1mbricas con altas velocidades de [&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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