{"id":116680,"date":"2018-03-11T10:45:52","date_gmt":"2018-03-11T10:45:52","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/design-and-implementation-of-low-complexity-adaptive-optical-ofdm-systems-for-software-defined-transmission-in-elastic-optical-networks\/"},"modified":"2018-03-11T10:45:52","modified_gmt":"2018-03-11T10:45:52","slug":"design-and-implementation-of-low-complexity-adaptive-optical-ofdm-systems-for-software-defined-transmission-in-elastic-optical-networks","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/politecnica-de-catalunya\/design-and-implementation-of-low-complexity-adaptive-optical-ofdm-systems-for-software-defined-transmission-in-elastic-optical-networks\/","title":{"rendered":"Design and implementation of low complexity adaptive optical ofdm systems for software-defined transmission in elastic optical networks"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Laia Nadal Reixats <\/strong><\/h2>\n<p>Debido al crecimiento del tr\u00e1fico ip y de la demanda de servicios de banda ancha, las redes \u00f3pticas est\u00e1n experimentando cambios significativos. Los formatos avanzados de modulaci\u00f3n, implementados a nivel de procesado de la se\u00f1al digital, habilitan la transmisi\u00f3n a alta velocidad. Mientras que en la capa de red, el espectro \u00f3ptico se divide en ranuras flexibles ocupando el ancho de banda necesario seg\u00fan la demanda de tr\u00e1fico. La transmisi\u00f3n a alta velocidad es m\u00e1s tangible una vez habilitadas todas estas funcionalidades. De este modo uno de los principales objetivos de esta tesis es introducir flexibilidad en el sistema. Adem\u00e1s, minimizar el coste y maximizar la eficiencia espectral del sistema son tambi\u00e9n dos aspectos cruciales a considerar en el dise\u00f1o del transmisor y receptor.  esta tesis investiga el uso de la tecnolog\u00eda optical orthogonal frequency division multiplexing (ofdm) basada en la transformada de fourier (fft) y en la de hartley (fht) con tal de dise\u00f1ar un sistema flexible y capaz de transmitir a alta velocidad a trav\u00e9s de la fibra \u00f3ptica. Por lo tanto, se proponen distintas soluciones de bajo coste v\u00e1lidas para utilizar en redes \u00f3pticas el\u00e1sticas.  en primer lugar, se investigan y se proponen sistemas basados en detecci\u00f3n directa con tal de soportar la presente y futura demanda. Despu\u00e9s de una introducci\u00f3n de los principios de ofdm y su aplicaci\u00f3n en los sistemas \u00f3pticos, se introduce el principal problema de \u00e9sta modulaci\u00f3n. En particular se presentan el peak-to-average power ratio (papr) y los ruidos de clipping y cuantizaci\u00f3n como limitaciones de los sistemas ofdm. Se analizan t\u00e9cnicas de reducci\u00f3n de papr con tal de reducir el impacto de estos impedimentos. Tambi\u00e9n se proponen t\u00e9cnicas de baja complejidad para reducir el papr basadas en la fht.  finalmente, se utilizan algoritmos de asignaci\u00f3n de bits y potencia, bit loading (bl) y power loading (pl), con tal de combatir la dispersi\u00f3n crom\u00e1tica cuando se transmite por el canal \u00f3ptico. Con la implementaci\u00f3n de los algoritmos de bl y pl, se pueden dise\u00f1ar transmisores y receptores flexibles adaptando la velocidad a la demanda del momento y a las actuales condiciones de la red. En particular, los s\u00edmbolos ofdm se crean mapeando cada portadora con un formato de modulaci\u00f3n distinto seg\u00fan el perfil del canal. El sistema se valida experimentalmente mostrando las prestaciones y los beneficios de incluir flexibilidad con tal de facilitar la transmisi\u00f3n a alta velocidad y cubrir las necesidades de internet del futuro.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Design and implementation of low complexity adaptive optical ofdm systems for software-defined transmission in elastic optical networks<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Design and implementation of low complexity adaptive optical ofdm systems for software-defined transmission in elastic optical networks <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Laia Nadal Reixats <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 21\/11\/2014<\/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>Michela Svaluto   Moreolo<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: nicola Calabretta <\/li>\n<li>lucia Marazzi (vocal)<\/li>\n<li>  (vocal)<\/li>\n<li>  (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Laia Nadal Reixats Debido al crecimiento del tr\u00e1fico ip y de la demanda de servicios de banda [&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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