{"id":41953,"date":"1999-01-01T00:00:00","date_gmt":"1999-01-01T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/contribucion-al-estudio-de-las-comunicaciones-opticas-no-guiadas-con-senales-de-espectro-ensanchado\/"},"modified":"1999-01-01T00:00:00","modified_gmt":"1999-01-01T00:00:00","slug":"contribucion-al-estudio-de-las-comunicaciones-opticas-no-guiadas-con-senales-de-espectro-ensanchado","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-tecnologicas\/contribucion-al-estudio-de-las-comunicaciones-opticas-no-guiadas-con-senales-de-espectro-ensanchado\/","title":{"rendered":"Contribucion al estudio de las comunicaciones opticas no guiadas con se\u00f1ales de espectro ensanchado."},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Vento Alvarez Jos\u00e9 Raul <\/strong><\/h2>\n<p>Este trabajo presenta un estudio sobre el comportamiento de las se\u00f1ales de espectro ensanchado (ss) en los sistemas de comunicaciones dentro del canal ptico infrarrojo no guiado. Se ha analizado y comprobado las caracter\u00edsticas de la modulaci\u00f3n por secuencia directa frente a interferencias presentes por iluminaci\u00f3n artificial y frente a la propagaci\u00f3n multicamino. Se han desarrollado y caracterizado enlaces con espectro ensanchado por secuencia directa (ss\/ds) con c\u00f3digos de m\u00e1xima longitud (mls). La recuperaci\u00f3n de sincronismo en el receptor se realiz\u00f3 con un correlador serie simple con desplazamiento continuo en el tiempo y, el seguimiento, con lazo enganchado en retardo (dll).  el comportamiento de los enlaces comprueba las predicciones te\u00f3ricas del incremento en la snr respecto a otros m\u00e9todos de modulaci\u00f3n frente a interferencias por iluminaci\u00f3n artificial. La mejora obtenida en la relaci\u00f3n se\u00f1al\/ruido (snr) con esta t\u00e9cnica posibilita una sensible disminuci\u00f3n de la potencia de emisi\u00f3n en los enlaces. Se valora la factibilidad de la utilizaci\u00f3n de fotodiodos pin en receptores para quasidifusi\u00f3n.  adem\u00e1s, se ha estudiado y comprobado el comportamiento de la multiplexaci\u00f3n por divisi\u00f3n en c\u00f3digos (cdma) y sus posibilidades para aplicaciones en redes de datos por infrarrojo.  tambi\u00e9n, se presenta un m\u00e9todo preciso de medida de retardos y distancias, aprovechando las caracter\u00edsticas de las secuencias de m\u00e1xima longitud (mls) en el canal ptico.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Contribucion al estudio de las comunicaciones opticas no guiadas con se\u00f1ales de espectro ensanchado.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Contribucion al estudio de las comunicaciones opticas no guiadas con se\u00f1ales de espectro ensanchado. <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Vento Alvarez Jos\u00e9 Raul <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 01\/01\/1999<\/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>Francisco Jos\u00e9 L\u00f3pez Hern\u00e1ndez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: ignacio Esquivias moscardo <\/li>\n<li> Lopez presmanes Jos\u00e9 Luis (vocal)<\/li>\n<li>Juan  Carlos Mi\u00f1ano dom\u00ednguez (vocal)<\/li>\n<li>Rafael Perez jimenez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Vento Alvarez Jos\u00e9 Raul Este trabajo presenta un estudio sobre el comportamiento de las se\u00f1ales de espectro [&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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