{"id":53168,"date":"2018-03-09T22:40:48","date_gmt":"2018-03-09T22:40:48","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/detectores-multivelocidad-para-comunicaciones-moviles-de-tercera-generacion\/"},"modified":"2018-03-09T22:40:48","modified_gmt":"2018-03-09T22:40:48","slug":"detectores-multivelocidad-para-comunicaciones-moviles-de-tercera-generacion","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/radiocomunicaciones\/detectores-multivelocidad-para-comunicaciones-moviles-de-tercera-generacion\/","title":{"rendered":"Detectores multivelocidad para comunicaciones m\u00f3viles de tercera generaci\u00f3n"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Ana Mar\u00eda Barbancho P\u00e9rez <\/strong><\/h2>\n<p>El est\u00e1ndar europeo de comunicaciones m\u00f3viles de tercera generaci\u00f3n, umts universal mobile communications system), tiene definido para el interfaz aire acceso m\u00faltiple por divisi\u00f3n de c\u00f3digo de banda ancha, wcdma (wideband code divisi\u00f3n m\u00faltiple access). Este tipo de tecnolog\u00eda de acceso al medio compartido est\u00e1 limitada por la interferencia multiacceso.     el efecto de la interferencia multiacceso, en los sistemas cdma, se puede mitigar bastante si se dise\u00f1a de manera adecuada el detector: por consiguiente, en estos sistemas la capacidad de transmisi\u00f3n va a estar limitada, entre otros factores, por el tipo de detector que se utilice. El mejor detector que se puede utilizar es el \u00f3ptimo multiusuario, el cual presenta el problema de que su complejidad crece de forma exponencial con el n\u00famero de usuarios activos en el sistema. Dado que el detector \u00f3ptimo es inviable debido a su compleja, en la pr\u00e1ctica, se utilizan aproximaciones lineales al mismo como son el detector de de correlaci\u00f3n y el mmse (minimum mean square error). Tambi\u00e9n existen detectores que utilizan t\u00e9cnicas de cancelaci\u00f3n de interferencias, cuyo objetivo es eliminar la mayor cantidad de interferencia multiacceso posible. Los dos esquemas principales de este tipo de detecci\u00f3n son la cancelaci\u00f3n sucesiva de interferencias sic (successive interference cancellation) y la cancelaci\u00f3n paralela de interferencias pic (parallel interference cancellation). Sobre estas t\u00e9cnicas de detecci\u00f3n aplicadas a la se\u00f1al cdma monovelocidad, se encuentran numerosas referencias. Sin embargo, no ocurre lo mismo para se\u00f1ales cdma multivelocidad con c\u00f3digos de ensanchamiento de longitud variable y con un c\u00f3digo de aleatorizaci\u00f3n superpuesto, como es el caso de la se\u00f1al del sistema umts. De hecho, en la literatura s\u00f3lo se encuentran casos concretos de detectores multivelocida entre los cuales algunos tienen severas restricciones en las velocidades posibles de los usuarios.     de aqu\u00ed surge e<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Detectores multivelocidad para comunicaciones m\u00f3viles de tercera generaci\u00f3n<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Detectores multivelocidad para comunicaciones m\u00f3viles de tercera generaci\u00f3n <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Ana Mar\u00eda Barbancho P\u00e9rez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 M\u00e1laga<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 16\/06\/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>Jos\u00e9 Tom\u00e1s Entrambasaguas Mu\u00f1oz<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Luis D\u00edez del r\u00edo <\/li>\n<li>Francisco Ramos l\u00f3pez (vocal)<\/li>\n<li>angel Mar\u00eda Bravo santos (vocal)<\/li>\n<li>matilde S\u00e1nchez fern\u00e1ndez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Ana Mar\u00eda Barbancho P\u00e9rez El est\u00e1ndar europeo de comunicaciones m\u00f3viles de tercera generaci\u00f3n, umts universal mobile communications [&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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