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Evolución de la telefonía
             móvil

   primera generación

   Segunda generación

   Tercera generación

   Cuarta generación
En la primera generación
En 1981 el fabricante Ericsson lanza el sistema NMT 450 (Nórdica
Mobile Telephony 450 MHz). Este sistema seguía utilizando
canales de radio analógicos (frecuencias en torno a 450 MHz) con
modulación en frecuencia (FM). Era el primer sistema del mundo
de telefonía móvil tal como se entiende hoy en día.
En la segunda generación

   En la década de 1990 nace la segunda generación, que utiliza sistemas
    como GSM, IS-136, iDEN e IS-95. Las frecuencias utilizadas en Europa
    fueron de 900 y 1800 MHz.
   El desarrollo de esta generación tiene como piedra angular la digitalización
    de las comunicaciones.
En la tercera generación
   nace de la necesidad de aumentar la capacidad de transmisión de datos
    para poder ofrecer servicios como la conexión a Internet desde el móvil, la
    videoconferencia, la televisión y la descarga de archivos.
En la cuarta generación
   La generación 4, o 4G es la evolución tecnológica que ofrece al usuario de
    telefonía móvil un mayor ancho de banda que permite, entre muchas otras
    cosas, la recepción de televisión en Alta Definición

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Diapositivas de la evolucion de la telefonia movil

  • 1. Evolución de la telefonía móvil  primera generación  Segunda generación  Tercera generación  Cuarta generación
  • 2. En la primera generación En 1981 el fabricante Ericsson lanza el sistema NMT 450 (Nórdica Mobile Telephony 450 MHz). Este sistema seguía utilizando canales de radio analógicos (frecuencias en torno a 450 MHz) con modulación en frecuencia (FM). Era el primer sistema del mundo de telefonía móvil tal como se entiende hoy en día.
  • 3. En la segunda generación  En la década de 1990 nace la segunda generación, que utiliza sistemas como GSM, IS-136, iDEN e IS-95. Las frecuencias utilizadas en Europa fueron de 900 y 1800 MHz.  El desarrollo de esta generación tiene como piedra angular la digitalización de las comunicaciones.
  • 4. En la tercera generación  nace de la necesidad de aumentar la capacidad de transmisión de datos para poder ofrecer servicios como la conexión a Internet desde el móvil, la videoconferencia, la televisión y la descarga de archivos.
  • 5. En la cuarta generación  La generación 4, o 4G es la evolución tecnológica que ofrece al usuario de telefonía móvil un mayor ancho de banda que permite, entre muchas otras cosas, la recepción de televisión en Alta Definición